| /************************************************* |
| * Perl-Compatible Regular Expressions * |
| *************************************************/ |
| |
| /* PCRE is a library of functions to support regular expressions whose syntax |
| and semantics are as close as possible to those of the Perl 5 language. |
| |
| Written by Philip Hazel |
| Copyright (c) 1997-2007 University of Cambridge |
| |
| ----------------------------------------------------------------------------- |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions are met: |
| |
| * Redistributions of source code must retain the above copyright notice, |
| this list of conditions and the following disclaimer. |
| |
| * Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
| documentation and/or other materials provided with the distribution. |
| |
| * Neither the name of the University of Cambridge nor the names of its |
| contributors may be used to endorse or promote products derived from |
| this software without specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| POSSIBILITY OF SUCH DAMAGE. |
| ----------------------------------------------------------------------------- |
| */ |
| |
| |
| /* This module contains the external function pcre_compile(), along with |
| supporting internal functions that are not used by other modules. */ |
| |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #define NLBLOCK cd /* Block containing newline information */ |
| #define PSSTART start_pattern /* Field containing processed string start */ |
| #define PSEND end_pattern /* Field containing processed string end */ |
| |
| #include "pcre_internal.h" |
| |
| |
| /* When DEBUG is defined, we need the pcre_printint() function, which is also |
| used by pcretest. DEBUG is not defined when building a production library. */ |
| |
| #ifdef DEBUG |
| #include "pcre_printint.src" |
| #endif |
| |
| |
| /* Macro for setting individual bits in class bitmaps. */ |
| |
| #define SETBIT(a,b) a[b/8] |= (1 << (b%8)) |
| |
| /* Maximum length value to check against when making sure that the integer that |
| holds the compiled pattern length does not overflow. We make it a bit less than |
| INT_MAX to allow for adding in group terminating bytes, so that we don't have |
| to check them every time. */ |
| |
| #define OFLOW_MAX (INT_MAX - 20) |
| |
| |
| /************************************************* |
| * Code parameters and static tables * |
| *************************************************/ |
| |
| /* This value specifies the size of stack workspace that is used during the |
| first pre-compile phase that determines how much memory is required. The regex |
| is partly compiled into this space, but the compiled parts are discarded as |
| soon as they can be, so that hopefully there will never be an overrun. The code |
| does, however, check for an overrun. The largest amount I've seen used is 218, |
| so this number is very generous. |
| |
| The same workspace is used during the second, actual compile phase for |
| remembering forward references to groups so that they can be filled in at the |
| end. Each entry in this list occupies LINK_SIZE bytes, so even when LINK_SIZE |
| is 4 there is plenty of room. */ |
| |
| #define COMPILE_WORK_SIZE (4096) |
| |
| |
| /* Table for handling escaped characters in the range '0'-'z'. Positive returns |
| are simple data values; negative values are for special things like \d and so |
| on. Zero means further processing is needed (for things like \x), or the escape |
| is invalid. */ |
| |
| #ifndef EBCDIC /* This is the "normal" table for ASCII systems */ |
| static const short int escapes[] = { |
| 0, 0, 0, 0, 0, 0, 0, 0, /* 0 - 7 */ |
| 0, 0, ':', ';', '<', '=', '>', '?', /* 8 - ? */ |
| '@', -ESC_A, -ESC_B, -ESC_C, -ESC_D, -ESC_E, 0, -ESC_G, /* @ - G */ |
| -ESC_H, 0, 0, -ESC_K, 0, 0, 0, 0, /* H - O */ |
| -ESC_P, -ESC_Q, -ESC_R, -ESC_S, 0, 0, -ESC_V, -ESC_W, /* P - W */ |
| -ESC_X, 0, -ESC_Z, '[', '\\', ']', '^', '_', /* X - _ */ |
| '`', 7, -ESC_b, 0, -ESC_d, ESC_e, ESC_f, 0, /* ` - g */ |
| -ESC_h, 0, 0, -ESC_k, 0, 0, ESC_n, 0, /* h - o */ |
| -ESC_p, 0, ESC_r, -ESC_s, ESC_tee, 0, -ESC_v, -ESC_w, /* p - w */ |
| 0, 0, -ESC_z /* x - z */ |
| }; |
| |
| #else /* This is the "abnormal" table for EBCDIC systems */ |
| static const short int escapes[] = { |
| /* 48 */ 0, 0, 0, '.', '<', '(', '+', '|', |
| /* 50 */ '&', 0, 0, 0, 0, 0, 0, 0, |
| /* 58 */ 0, 0, '!', '$', '*', ')', ';', '~', |
| /* 60 */ '-', '/', 0, 0, 0, 0, 0, 0, |
| /* 68 */ 0, 0, '|', ',', '%', '_', '>', '?', |
| /* 70 */ 0, 0, 0, 0, 0, 0, 0, 0, |
| /* 78 */ 0, '`', ':', '#', '@', '\'', '=', '"', |
| /* 80 */ 0, 7, -ESC_b, 0, -ESC_d, ESC_e, ESC_f, 0, |
| /* 88 */-ESC_h, 0, 0, '{', 0, 0, 0, 0, |
| /* 90 */ 0, 0, -ESC_k, 'l', 0, ESC_n, 0, -ESC_p, |
| /* 98 */ 0, ESC_r, 0, '}', 0, 0, 0, 0, |
| /* A0 */ 0, '~', -ESC_s, ESC_tee, 0,-ESC_v, -ESC_w, 0, |
| /* A8 */ 0,-ESC_z, 0, 0, 0, '[', 0, 0, |
| /* B0 */ 0, 0, 0, 0, 0, 0, 0, 0, |
| /* B8 */ 0, 0, 0, 0, 0, ']', '=', '-', |
| /* C0 */ '{',-ESC_A, -ESC_B, -ESC_C, -ESC_D,-ESC_E, 0, -ESC_G, |
| /* C8 */-ESC_H, 0, 0, 0, 0, 0, 0, 0, |
| /* D0 */ '}', 0, -ESC_K, 0, 0, 0, 0, -ESC_P, |
| /* D8 */-ESC_Q,-ESC_R, 0, 0, 0, 0, 0, 0, |
| /* E0 */ '\\', 0, -ESC_S, 0, 0,-ESC_V, -ESC_W, -ESC_X, |
| /* E8 */ 0,-ESC_Z, 0, 0, 0, 0, 0, 0, |
| /* F0 */ 0, 0, 0, 0, 0, 0, 0, 0, |
| /* F8 */ 0, 0, 0, 0, 0, 0, 0, 0 |
| }; |
| #endif |
| |
| |
| /* Table of special "verbs" like (*PRUNE). This is a short table, so it is |
| searched linearly. Put all the names into a single string, in order to reduce |
| the number of relocations when a shared library is dynamically linked. */ |
| |
| typedef struct verbitem { |
| int len; |
| int op; |
| } verbitem; |
| |
| static const char verbnames[] = |
| "ACCEPT\0" |
| "COMMIT\0" |
| "F\0" |
| "FAIL\0" |
| "PRUNE\0" |
| "SKIP\0" |
| "THEN"; |
| |
| static verbitem verbs[] = { |
| { 6, OP_ACCEPT }, |
| { 6, OP_COMMIT }, |
| { 1, OP_FAIL }, |
| { 4, OP_FAIL }, |
| { 5, OP_PRUNE }, |
| { 4, OP_SKIP }, |
| { 4, OP_THEN } |
| }; |
| |
| static int verbcount = sizeof(verbs)/sizeof(verbitem); |
| |
| |
| /* Tables of names of POSIX character classes and their lengths. The names are |
| now all in a single string, to reduce the number of relocations when a shared |
| library is dynamically loaded. The list of lengths is terminated by a zero |
| length entry. The first three must be alpha, lower, upper, as this is assumed |
| for handling case independence. */ |
| |
| static const char posix_names[] = |
| "alpha\0" "lower\0" "upper\0" "alnum\0" "ascii\0" "blank\0" |
| "cntrl\0" "digit\0" "graph\0" "print\0" "punct\0" "space\0" |
| "word\0" "xdigit"; |
| |
| static const uschar posix_name_lengths[] = { |
| 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 6, 0 }; |
| |
| /* Table of class bit maps for each POSIX class. Each class is formed from a |
| base map, with an optional addition or removal of another map. Then, for some |
| classes, there is some additional tweaking: for [:blank:] the vertical space |
| characters are removed, and for [:alpha:] and [:alnum:] the underscore |
| character is removed. The triples in the table consist of the base map offset, |
| second map offset or -1 if no second map, and a non-negative value for map |
| addition or a negative value for map subtraction (if there are two maps). The |
| absolute value of the third field has these meanings: 0 => no tweaking, 1 => |
| remove vertical space characters, 2 => remove underscore. */ |
| |
| static const int posix_class_maps[] = { |
| cbit_word, cbit_digit, -2, /* alpha */ |
| cbit_lower, -1, 0, /* lower */ |
| cbit_upper, -1, 0, /* upper */ |
| cbit_word, -1, 2, /* alnum - word without underscore */ |
| cbit_print, cbit_cntrl, 0, /* ascii */ |
| cbit_space, -1, 1, /* blank - a GNU extension */ |
| cbit_cntrl, -1, 0, /* cntrl */ |
| cbit_digit, -1, 0, /* digit */ |
| cbit_graph, -1, 0, /* graph */ |
| cbit_print, -1, 0, /* print */ |
| cbit_punct, -1, 0, /* punct */ |
| cbit_space, -1, 0, /* space */ |
| cbit_word, -1, 0, /* word - a Perl extension */ |
| cbit_xdigit,-1, 0 /* xdigit */ |
| }; |
| |
| |
| #define STRING(a) # a |
| #define XSTRING(s) STRING(s) |
| |
| /* The texts of compile-time error messages. These are "char *" because they |
| are passed to the outside world. Do not ever re-use any error number, because |
| they are documented. Always add a new error instead. Messages marked DEAD below |
| are no longer used. This used to be a table of strings, but in order to reduce |
| the number of relocations needed when a shared library is loaded dynamically, |
| it is now one long string. We cannot use a table of offsets, because the |
| lengths of inserts such as XSTRING(MAX_NAME_SIZE) are not known. Instead, we |
| simply count through to the one we want - this isn't a performance issue |
| because these strings are used only when there is a compilation error. */ |
| |
| static const char error_texts[] = |
| "no error\0" |
| "\\ at end of pattern\0" |
| "\\c at end of pattern\0" |
| "unrecognized character follows \\\0" |
| "numbers out of order in {} quantifier\0" |
| /* 5 */ |
| "number too big in {} quantifier\0" |
| "missing terminating ] for character class\0" |
| "invalid escape sequence in character class\0" |
| "range out of order in character class\0" |
| "nothing to repeat\0" |
| /* 10 */ |
| "operand of unlimited repeat could match the empty string\0" /** DEAD **/ |
| "internal error: unexpected repeat\0" |
| "unrecognized character after (?\0" |
| "POSIX named classes are supported only within a class\0" |
| "missing )\0" |
| /* 15 */ |
| "reference to non-existent subpattern\0" |
| "erroffset passed as NULL\0" |
| "unknown option bit(s) set\0" |
| "missing ) after comment\0" |
| "parentheses nested too deeply\0" /** DEAD **/ |
| /* 20 */ |
| "regular expression is too large\0" |
| "failed to get memory\0" |
| "unmatched parentheses\0" |
| "internal error: code overflow\0" |
| "unrecognized character after (?<\0" |
| /* 25 */ |
| "lookbehind assertion is not fixed length\0" |
| "malformed number or name after (?(\0" |
| "conditional group contains more than two branches\0" |
| "assertion expected after (?(\0" |
| "(?R or (?[+-]digits must be followed by )\0" |
| /* 30 */ |
| "unknown POSIX class name\0" |
| "POSIX collating elements are not supported\0" |
| "this version of PCRE is not compiled with PCRE_UTF8 support\0" |
| "spare error\0" /** DEAD **/ |
| "character value in \\x{...} sequence is too large\0" |
| /* 35 */ |
| "invalid condition (?(0)\0" |
| "\\C not allowed in lookbehind assertion\0" |
| "PCRE does not support \\L, \\l, \\N, \\U, or \\u\0" |
| "number after (?C is > 255\0" |
| "closing ) for (?C expected\0" |
| /* 40 */ |
| "recursive call could loop indefinitely\0" |
| "unrecognized character after (?P\0" |
| "syntax error in subpattern name (missing terminator)\0" |
| "two named subpatterns have the same name\0" |
| "invalid UTF-8 string\0" |
| /* 45 */ |
| "support for \\P, \\p, and \\X has not been compiled\0" |
| "malformed \\P or \\p sequence\0" |
| "unknown property name after \\P or \\p\0" |
| "subpattern name is too long (maximum " XSTRING(MAX_NAME_SIZE) " characters)\0" |
| "too many named subpatterns (maximum " XSTRING(MAX_NAME_COUNT) ")\0" |
| /* 50 */ |
| "repeated subpattern is too long\0" /** DEAD **/ |
| "octal value is greater than \\377 (not in UTF-8 mode)\0" |
| "internal error: overran compiling workspace\0" |
| "internal error: previously-checked referenced subpattern not found\0" |
| "DEFINE group contains more than one branch\0" |
| /* 55 */ |
| "repeating a DEFINE group is not allowed\0" |
| "inconsistent NEWLINE options\0" |
| "\\g is not followed by a braced name or an optionally braced non-zero number\0" |
| "(?+ or (?- or (?(+ or (?(- must be followed by a non-zero number\0" |
| "(*VERB) with an argument is not supported\0" |
| /* 60 */ |
| "(*VERB) not recognized\0" |
| "number is too big"; |
| |
| |
| /* Definition to allow mutual recursion */ |
| |
| static BOOL |
| compile_regex(int, int, uschar **, const uschar **, int *, BOOL, BOOL, int, |
| int *, int *, branch_chain *, compile_data *, int *); |
| |
| |
| |
| /************************************************* |
| * Find an error text * |
| *************************************************/ |
| |
| /* The error texts are now all in one long string, to save on relocations. As |
| some of the text is of unknown length, we can't use a table of offsets. |
| Instead, just count through the strings. This is not a performance issue |
| because it happens only when there has been a compilation error. |
| |
| Argument: the error number |
| Returns: pointer to the error string |
| */ |
| |
| static const char * |
| find_error_text(int n) |
| { |
| const char *s = error_texts; |
| for (; n > 0; n--) while (*s++ != 0); |
| return s; |
| } |
| |
| |
| /************************************************* |
| * Handle escapes * |
| *************************************************/ |
| |
| /* This function is called when a \ has been encountered. It either returns a |
| positive value for a simple escape such as \n, or a negative value which |
| encodes one of the more complicated things such as \d. A backreference to group |
| n is returned as -(ESC_REF + n); ESC_REF is the highest ESC_xxx macro. When |
| UTF-8 is enabled, a positive value greater than 255 may be returned. On entry, |
| ptr is pointing at the \. On exit, it is on the final character of the escape |
| sequence. |
| |
| Arguments: |
| ptrptr points to the pattern position pointer |
| errorcodeptr points to the errorcode variable |
| bracount number of previous extracting brackets |
| options the options bits |
| isclass TRUE if inside a character class |
| |
| Returns: zero or positive => a data character |
| negative => a special escape sequence |
| on error, errorcodeptr is set |
| */ |
| |
| static int |
| check_escape(const uschar **ptrptr, int *errorcodeptr, int bracount, |
| int options, BOOL isclass) |
| { |
| BOOL utf8 = (options & PCRE_UTF8) != 0; |
| const uschar *ptr = *ptrptr + 1; |
| int c, i; |
| |
| GETCHARINCTEST(c, ptr); /* Get character value, increment pointer */ |
| ptr--; /* Set pointer back to the last byte */ |
| |
| /* If backslash is at the end of the pattern, it's an error. */ |
| |
| if (c == 0) *errorcodeptr = ERR1; |
| |
| /* Non-alphamerics are literals. For digits or letters, do an initial lookup in |
| a table. A non-zero result is something that can be returned immediately. |
| Otherwise further processing may be required. */ |
| |
| #ifndef EBCDIC /* ASCII coding */ |
| else if (c < '0' || c > 'z') {} /* Not alphameric */ |
| else if ((i = escapes[c - '0']) != 0) c = i; |
| |
| #else /* EBCDIC coding */ |
| else if (c < 'a' || (ebcdic_chartab[c] & 0x0E) == 0) {} /* Not alphameric */ |
| else if ((i = escapes[c - 0x48]) != 0) c = i; |
| #endif |
| |
| /* Escapes that need further processing, or are illegal. */ |
| |
| else |
| { |
| const uschar *oldptr; |
| BOOL braced, negated; |
| |
| switch (c) |
| { |
| /* A number of Perl escapes are not handled by PCRE. We give an explicit |
| error. */ |
| |
| case 'l': |
| case 'L': |
| case 'N': |
| case 'u': |
| case 'U': |
| *errorcodeptr = ERR37; |
| break; |
| |
| /* \g must be followed by a number, either plain or braced. If positive, it |
| is an absolute backreference. If negative, it is a relative backreference. |
| This is a Perl 5.10 feature. Perl 5.10 also supports \g{name} as a |
| reference to a named group. This is part of Perl's movement towards a |
| unified syntax for back references. As this is synonymous with \k{name}, we |
| fudge it up by pretending it really was \k. */ |
| |
| case 'g': |
| if (ptr[1] == '{') |
| { |
| const uschar *p; |
| for (p = ptr+2; *p != 0 && *p != '}'; p++) |
| if (*p != '-' && g_ascii_isdigit(*p) == 0) break; |
| if (*p != 0 && *p != '}') |
| { |
| c = -ESC_k; |
| break; |
| } |
| braced = TRUE; |
| ptr++; |
| } |
| else braced = FALSE; |
| |
| if (ptr[1] == '-') |
| { |
| negated = TRUE; |
| ptr++; |
| } |
| else negated = FALSE; |
| |
| c = 0; |
| while (g_ascii_isdigit(ptr[1]) != 0) |
| c = c * 10 + *(++ptr) - '0'; |
| |
| if (c < 0) |
| { |
| *errorcodeptr = ERR61; |
| break; |
| } |
| |
| if (c == 0 || (braced && *(++ptr) != '}')) |
| { |
| *errorcodeptr = ERR57; |
| break; |
| } |
| |
| if (negated) |
| { |
| if (c > bracount) |
| { |
| *errorcodeptr = ERR15; |
| break; |
| } |
| c = bracount - (c - 1); |
| } |
| |
| c = -(ESC_REF + c); |
| break; |
| |
| /* The handling of escape sequences consisting of a string of digits |
| starting with one that is not zero is not straightforward. By experiment, |
| the way Perl works seems to be as follows: |
| |
| Outside a character class, the digits are read as a decimal number. If the |
| number is less than 10, or if there are that many previous extracting |
| left brackets, then it is a back reference. Otherwise, up to three octal |
| digits are read to form an escaped byte. Thus \123 is likely to be octal |
| 123 (cf \0123, which is octal 012 followed by the literal 3). If the octal |
| value is greater than 377, the least significant 8 bits are taken. Inside a |
| character class, \ followed by a digit is always an octal number. */ |
| |
| case '1': case '2': case '3': case '4': case '5': |
| case '6': case '7': case '8': case '9': |
| |
| if (!isclass) |
| { |
| oldptr = ptr; |
| c -= '0'; |
| while (g_ascii_isdigit(ptr[1]) != 0) |
| c = c * 10 + *(++ptr) - '0'; |
| if (c < 0) |
| { |
| *errorcodeptr = ERR61; |
| break; |
| } |
| if (c < 10 || c <= bracount) |
| { |
| c = -(ESC_REF + c); |
| break; |
| } |
| ptr = oldptr; /* Put the pointer back and fall through */ |
| } |
| |
| /* Handle an octal number following \. If the first digit is 8 or 9, Perl |
| generates a binary zero byte and treats the digit as a following literal. |
| Thus we have to pull back the pointer by one. */ |
| |
| if ((c = *ptr) >= '8') |
| { |
| ptr--; |
| c = 0; |
| break; |
| } |
| |
| /* \0 always starts an octal number, but we may drop through to here with a |
| larger first octal digit. The original code used just to take the least |
| significant 8 bits of octal numbers (I think this is what early Perls used |
| to do). Nowadays we allow for larger numbers in UTF-8 mode, but no more |
| than 3 octal digits. */ |
| |
| case '0': |
| c -= '0'; |
| while(i++ < 2 && ptr[1] >= '0' && ptr[1] <= '7') |
| c = c * 8 + *(++ptr) - '0'; |
| if (!utf8 && c > 255) *errorcodeptr = ERR51; |
| break; |
| |
| /* \x is complicated. \x{ddd} is a character number which can be greater |
| than 0xff in utf8 mode, but only if the ddd are hex digits. If not, { is |
| treated as a data character. */ |
| |
| case 'x': |
| if (ptr[1] == '{') |
| { |
| const uschar *pt = ptr + 2; |
| int count = 0; |
| |
| c = 0; |
| while (g_ascii_isxdigit(*pt) != 0) |
| { |
| register int cc = *pt++; |
| if (c == 0 && cc == '0') continue; /* Leading zeroes */ |
| count++; |
| |
| #ifndef EBCDIC /* ASCII coding */ |
| if (cc >= 'a') cc -= 32; /* Convert to upper case */ |
| c = (c << 4) + cc - ((cc < 'A')? '0' : ('A' - 10)); |
| #else /* EBCDIC coding */ |
| if (cc >= 'a' && cc <= 'z') cc += 64; /* Convert to upper case */ |
| c = (c << 4) + cc - ((cc >= '0')? '0' : ('A' - 10)); |
| #endif |
| } |
| |
| if (*pt == '}') |
| { |
| if (c < 0 || count > (utf8? 8 : 2)) *errorcodeptr = ERR34; |
| ptr = pt; |
| break; |
| } |
| |
| /* If the sequence of hex digits does not end with '}', then we don't |
| recognize this construct; fall through to the normal \x handling. */ |
| } |
| |
| /* Read just a single-byte hex-defined char */ |
| |
| c = 0; |
| while (i++ < 2 && g_ascii_isxdigit(ptr[1]) != 0) |
| { |
| int cc; /* Some compilers don't like ++ */ |
| cc = *(++ptr); /* in initializers */ |
| #ifndef EBCDIC /* ASCII coding */ |
| if (cc >= 'a') cc -= 32; /* Convert to upper case */ |
| c = c * 16 + cc - ((cc < 'A')? '0' : ('A' - 10)); |
| #else /* EBCDIC coding */ |
| if (cc <= 'z') cc += 64; /* Convert to upper case */ |
| c = c * 16 + cc - ((cc >= '0')? '0' : ('A' - 10)); |
| #endif |
| } |
| break; |
| |
| /* For \c, a following letter is upper-cased; then the 0x40 bit is flipped. |
| This coding is ASCII-specific, but then the whole concept of \cx is |
| ASCII-specific. (However, an EBCDIC equivalent has now been added.) */ |
| |
| case 'c': |
| c = *(++ptr); |
| if (c == 0) |
| { |
| *errorcodeptr = ERR2; |
| break; |
| } |
| |
| #ifndef EBCDIC /* ASCII coding */ |
| if (c >= 'a' && c <= 'z') c -= 32; |
| c ^= 0x40; |
| #else /* EBCDIC coding */ |
| if (c >= 'a' && c <= 'z') c += 64; |
| c ^= 0xC0; |
| #endif |
| break; |
| |
| /* PCRE_EXTRA enables extensions to Perl in the matter of escapes. Any |
| other alphameric following \ is an error if PCRE_EXTRA was set; otherwise, |
| for Perl compatibility, it is a literal. This code looks a bit odd, but |
| there used to be some cases other than the default, and there may be again |
| in future, so I haven't "optimized" it. */ |
| |
| default: |
| if ((options & PCRE_EXTRA) != 0) switch(c) |
| { |
| default: |
| *errorcodeptr = ERR3; |
| break; |
| } |
| break; |
| } |
| } |
| |
| *ptrptr = ptr; |
| return c; |
| } |
| |
| |
| |
| #ifdef SUPPORT_UCP |
| /************************************************* |
| * Handle \P and \p * |
| *************************************************/ |
| |
| /* This function is called after \P or \p has been encountered, provided that |
| PCRE is compiled with support for Unicode properties. On entry, ptrptr is |
| pointing at the P or p. On exit, it is pointing at the final character of the |
| escape sequence. |
| |
| Argument: |
| ptrptr points to the pattern position pointer |
| negptr points to a boolean that is set TRUE for negation else FALSE |
| dptr points to an int that is set to the detailed property value |
| errorcodeptr points to the error code variable |
| |
| Returns: type value from ucp_type_table, or -1 for an invalid type |
| */ |
| |
| static int |
| get_ucp(const uschar **ptrptr, BOOL *negptr, int *dptr, int *errorcodeptr) |
| { |
| int c, i, bot, top; |
| const uschar *ptr = *ptrptr; |
| char name[32]; |
| |
| c = *(++ptr); |
| if (c == 0) goto ERROR_RETURN; |
| |
| *negptr = FALSE; |
| |
| /* \P or \p can be followed by a name in {}, optionally preceded by ^ for |
| negation. */ |
| |
| if (c == '{') |
| { |
| if (ptr[1] == '^') |
| { |
| *negptr = TRUE; |
| ptr++; |
| } |
| for (i = 0; i < (int)sizeof(name) - 1; i++) |
| { |
| c = *(++ptr); |
| if (c == 0) goto ERROR_RETURN; |
| if (c == '}') break; |
| name[i] = c; |
| } |
| if (c !='}') goto ERROR_RETURN; |
| name[i] = 0; |
| } |
| |
| /* Otherwise there is just one following character */ |
| |
| else |
| { |
| name[0] = c; |
| name[1] = 0; |
| } |
| |
| *ptrptr = ptr; |
| |
| /* Search for a recognized property name using binary chop */ |
| |
| bot = 0; |
| top = _pcre_utt_size; |
| |
| while (bot < top) |
| { |
| i = (bot + top) >> 1; |
| c = strcmp(name, _pcre_utt_names + _pcre_utt[i].name_offset); |
| if (c == 0) |
| { |
| *dptr = _pcre_utt[i].value; |
| return _pcre_utt[i].type; |
| } |
| if (c > 0) bot = i + 1; else top = i; |
| } |
| |
| *errorcodeptr = ERR47; |
| *ptrptr = ptr; |
| return -1; |
| |
| ERROR_RETURN: |
| *errorcodeptr = ERR46; |
| *ptrptr = ptr; |
| return -1; |
| } |
| #endif |
| |
| |
| |
| |
| /************************************************* |
| * Check for counted repeat * |
| *************************************************/ |
| |
| /* This function is called when a '{' is encountered in a place where it might |
| start a quantifier. It looks ahead to see if it really is a quantifier or not. |
| It is only a quantifier if it is one of the forms {ddd} {ddd,} or {ddd,ddd} |
| where the ddds are digits. |
| |
| Arguments: |
| p pointer to the first char after '{' |
| |
| Returns: TRUE or FALSE |
| */ |
| |
| static BOOL |
| is_counted_repeat(const uschar *p) |
| { |
| if (g_ascii_isdigit(*p++) == 0) return FALSE; |
| while (g_ascii_isdigit(*p) != 0) p++; |
| if (*p == '}') return TRUE; |
| |
| if (*p++ != ',') return FALSE; |
| if (*p == '}') return TRUE; |
| |
| if (g_ascii_isdigit(*p++) == 0) return FALSE; |
| while (g_ascii_isdigit(*p) != 0) p++; |
| |
| return (*p == '}'); |
| } |
| |
| |
| |
| /************************************************* |
| * Read repeat counts * |
| *************************************************/ |
| |
| /* Read an item of the form {n,m} and return the values. This is called only |
| after is_counted_repeat() has confirmed that a repeat-count quantifier exists, |
| so the syntax is guaranteed to be correct, but we need to check the values. |
| |
| Arguments: |
| p pointer to first char after '{' |
| minp pointer to int for min |
| maxp pointer to int for max |
| returned as -1 if no max |
| errorcodeptr points to error code variable |
| |
| Returns: pointer to '}' on success; |
| current ptr on error, with errorcodeptr set non-zero |
| */ |
| |
| static const uschar * |
| read_repeat_counts(const uschar *p, int *minp, int *maxp, int *errorcodeptr) |
| { |
| int min = 0; |
| int max = -1; |
| |
| /* Read the minimum value and do a paranoid check: a negative value indicates |
| an integer overflow. */ |
| |
| while (g_ascii_isdigit(*p) != 0) min = min * 10 + *p++ - '0'; |
| if (min < 0 || min > 65535) |
| { |
| *errorcodeptr = ERR5; |
| return p; |
| } |
| |
| /* Read the maximum value if there is one, and again do a paranoid on its size. |
| Also, max must not be less than min. */ |
| |
| if (*p == '}') max = min; else |
| { |
| if (*(++p) != '}') |
| { |
| max = 0; |
| while(g_ascii_isdigit(*p) != 0) max = max * 10 + *p++ - '0'; |
| if (max < 0 || max > 65535) |
| { |
| *errorcodeptr = ERR5; |
| return p; |
| } |
| if (max < min) |
| { |
| *errorcodeptr = ERR4; |
| return p; |
| } |
| } |
| } |
| |
| /* Fill in the required variables, and pass back the pointer to the terminating |
| '}'. */ |
| |
| *minp = min; |
| *maxp = max; |
| return p; |
| } |
| |
| |
| |
| /************************************************* |
| * Find forward referenced subpattern * |
| *************************************************/ |
| |
| /* This function scans along a pattern's text looking for capturing |
| subpatterns, and counting them. If it finds a named pattern that matches the |
| name it is given, it returns its number. Alternatively, if the name is NULL, it |
| returns when it reaches a given numbered subpattern. This is used for forward |
| references to subpatterns. We know that if (?P< is encountered, the name will |
| be terminated by '>' because that is checked in the first pass. |
| |
| Arguments: |
| ptr current position in the pattern |
| count current count of capturing parens so far encountered |
| name name to seek, or NULL if seeking a numbered subpattern |
| lorn name length, or subpattern number if name is NULL |
| xmode TRUE if we are in /x mode |
| |
| Returns: the number of the named subpattern, or -1 if not found |
| */ |
| |
| static int |
| find_parens(const uschar *ptr, int count, const uschar *name, int lorn, |
| BOOL xmode) |
| { |
| const uschar *thisname; |
| |
| for (; *ptr != 0; ptr++) |
| { |
| int term; |
| |
| /* Skip over backslashed characters and also entire \Q...\E */ |
| |
| if (*ptr == '\\') |
| { |
| if (*(++ptr) == 0) return -1; |
| if (*ptr == 'Q') for (;;) |
| { |
| while (*(++ptr) != 0 && *ptr != '\\'); |
| if (*ptr == 0) return -1; |
| if (*(++ptr) == 'E') break; |
| } |
| continue; |
| } |
| |
| /* Skip over character classes */ |
| |
| if (*ptr == '[') |
| { |
| while (*(++ptr) != ']') |
| { |
| if (*ptr == 0) return -1; |
| if (*ptr == '\\') |
| { |
| if (*(++ptr) == 0) return -1; |
| if (*ptr == 'Q') for (;;) |
| { |
| while (*(++ptr) != 0 && *ptr != '\\'); |
| if (*ptr == 0) return -1; |
| if (*(++ptr) == 'E') break; |
| } |
| continue; |
| } |
| } |
| continue; |
| } |
| |
| /* Skip comments in /x mode */ |
| |
| if (xmode && *ptr == '#') |
| { |
| while (*(++ptr) != 0 && *ptr != '\n'); |
| if (*ptr == 0) return -1; |
| continue; |
| } |
| |
| /* An opening parens must now be a real metacharacter */ |
| |
| if (*ptr != '(') continue; |
| if (ptr[1] != '?' && ptr[1] != '*') |
| { |
| count++; |
| if (name == NULL && count == lorn) return count; |
| continue; |
| } |
| |
| ptr += 2; |
| if (*ptr == 'P') ptr++; /* Allow optional P */ |
| |
| /* We have to disambiguate (?<! and (?<= from (?<name> */ |
| |
| if ((*ptr != '<' || ptr[1] == '!' || ptr[1] == '=') && |
| *ptr != '\'') |
| continue; |
| |
| count++; |
| |
| if (name == NULL && count == lorn) return count; |
| term = *ptr++; |
| if (term == '<') term = '>'; |
| thisname = ptr; |
| while (*ptr != term) ptr++; |
| if (name != NULL && lorn == ptr - thisname && |
| strncmp((const char *)name, (const char *)thisname, lorn) == 0) |
| return count; |
| } |
| |
| return -1; |
| } |
| |
| |
| |
| /************************************************* |
| * Find first significant op code * |
| *************************************************/ |
| |
| /* This is called by several functions that scan a compiled expression looking |
| for a fixed first character, or an anchoring op code etc. It skips over things |
| that do not influence this. For some calls, a change of option is important. |
| For some calls, it makes sense to skip negative forward and all backward |
| assertions, and also the \b assertion; for others it does not. |
| |
| Arguments: |
| code pointer to the start of the group |
| options pointer to external options |
| optbit the option bit whose changing is significant, or |
| zero if none are |
| skipassert TRUE if certain assertions are to be skipped |
| |
| Returns: pointer to the first significant opcode |
| */ |
| |
| static const uschar* |
| first_significant_code(const uschar *code, int *options, int optbit, |
| BOOL skipassert) |
| { |
| for (;;) |
| { |
| switch ((int)*code) |
| { |
| case OP_OPT: |
| if (optbit > 0 && ((int)code[1] & optbit) != (*options & optbit)) |
| *options = (int)code[1]; |
| code += 2; |
| break; |
| |
| case OP_ASSERT_NOT: |
| case OP_ASSERTBACK: |
| case OP_ASSERTBACK_NOT: |
| if (!skipassert) return code; |
| do code += GET(code, 1); while (*code == OP_ALT); |
| code += _pcre_OP_lengths[*code]; |
| break; |
| |
| case OP_WORD_BOUNDARY: |
| case OP_NOT_WORD_BOUNDARY: |
| if (!skipassert) return code; |
| /* Fall through */ |
| |
| case OP_CALLOUT: |
| case OP_CREF: |
| case OP_RREF: |
| case OP_DEF: |
| code += _pcre_OP_lengths[*code]; |
| break; |
| |
| default: |
| return code; |
| } |
| } |
| /* Control never reaches here */ |
| } |
| |
| |
| |
| |
| /************************************************* |
| * Find the fixed length of a pattern * |
| *************************************************/ |
| |
| /* Scan a pattern and compute the fixed length of subject that will match it, |
| if the length is fixed. This is needed for dealing with backward assertions. |
| In UTF8 mode, the result is in characters rather than bytes. |
| |
| Arguments: |
| code points to the start of the pattern (the bracket) |
| options the compiling options |
| |
| Returns: the fixed length, or -1 if there is no fixed length, |
| or -2 if \C was encountered |
| */ |
| |
| static int |
| find_fixedlength(uschar *code, int options) |
| { |
| int length = -1; |
| |
| register int branchlength = 0; |
| register uschar *cc = code + 1 + LINK_SIZE; |
| |
| /* Scan along the opcodes for this branch. If we get to the end of the |
| branch, check the length against that of the other branches. */ |
| |
| for (;;) |
| { |
| int d; |
| register int op = *cc; |
| switch (op) |
| { |
| case OP_CBRA: |
| case OP_BRA: |
| case OP_ONCE: |
| case OP_COND: |
| d = find_fixedlength(cc + ((op == OP_CBRA)? 2:0), options); |
| if (d < 0) return d; |
| branchlength += d; |
| do cc += GET(cc, 1); while (*cc == OP_ALT); |
| cc += 1 + LINK_SIZE; |
| break; |
| |
| /* Reached end of a branch; if it's a ket it is the end of a nested |
| call. If it's ALT it is an alternation in a nested call. If it is |
| END it's the end of the outer call. All can be handled by the same code. */ |
| |
| case OP_ALT: |
| case OP_KET: |
| case OP_KETRMAX: |
| case OP_KETRMIN: |
| case OP_END: |
| if (length < 0) length = branchlength; |
| else if (length != branchlength) return -1; |
| if (*cc != OP_ALT) return length; |
| cc += 1 + LINK_SIZE; |
| branchlength = 0; |
| break; |
| |
| /* Skip over assertive subpatterns */ |
| |
| case OP_ASSERT: |
| case OP_ASSERT_NOT: |
| case OP_ASSERTBACK: |
| case OP_ASSERTBACK_NOT: |
| do cc += GET(cc, 1); while (*cc == OP_ALT); |
| /* Fall through */ |
| |
| /* Skip over things that don't match chars */ |
| |
| case OP_REVERSE: |
| case OP_CREF: |
| case OP_RREF: |
| case OP_DEF: |
| case OP_OPT: |
| case OP_CALLOUT: |
| case OP_SOD: |
| case OP_SOM: |
| case OP_EOD: |
| case OP_EODN: |
| case OP_CIRC: |
| case OP_DOLL: |
| case OP_NOT_WORD_BOUNDARY: |
| case OP_WORD_BOUNDARY: |
| cc += _pcre_OP_lengths[*cc]; |
| break; |
| |
| /* Handle literal characters */ |
| |
| case OP_CHAR: |
| case OP_CHARNC: |
| case OP_NOT: |
| branchlength++; |
| cc += 2; |
| #ifdef SUPPORT_UTF8 |
| if ((options & PCRE_UTF8) != 0) |
| { |
| while ((*cc & 0xc0) == 0x80) cc++; |
| } |
| #endif |
| break; |
| |
| /* Handle exact repetitions. The count is already in characters, but we |
| need to skip over a multibyte character in UTF8 mode. */ |
| |
| case OP_EXACT: |
| branchlength += GET2(cc,1); |
| cc += 4; |
| #ifdef SUPPORT_UTF8 |
| if ((options & PCRE_UTF8) != 0) |
| { |
| while((*cc & 0x80) == 0x80) cc++; |
| } |
| #endif |
| break; |
| |
| case OP_TYPEEXACT: |
| branchlength += GET2(cc,1); |
| if (cc[3] == OP_PROP || cc[3] == OP_NOTPROP) cc += 2; |
| cc += 4; |
| break; |
| |
| /* Handle single-char matchers */ |
| |
| case OP_PROP: |
| case OP_NOTPROP: |
| cc += 2; |
| /* Fall through */ |
| |
| case OP_NOT_DIGIT: |
| case OP_DIGIT: |
| case OP_NOT_WHITESPACE: |
| case OP_WHITESPACE: |
| case OP_NOT_WORDCHAR: |
| case OP_WORDCHAR: |
| case OP_ANY: |
| branchlength++; |
| cc++; |
| break; |
| |
| /* The single-byte matcher isn't allowed */ |
| |
| case OP_ANYBYTE: |
| return -2; |
| |
| /* Check a class for variable quantification */ |
| |
| #ifdef SUPPORT_UTF8 |
| case OP_XCLASS: |
| cc += GET(cc, 1) - 33; |
| /* Fall through */ |
| #endif |
| |
| case OP_CLASS: |
| case OP_NCLASS: |
| cc += 33; |
| |
| switch (*cc) |
| { |
| case OP_CRSTAR: |
| case OP_CRMINSTAR: |
| case OP_CRQUERY: |
| case OP_CRMINQUERY: |
| return -1; |
| |
| case OP_CRRANGE: |
| case OP_CRMINRANGE: |
| if (GET2(cc,1) != GET2(cc,3)) return -1; |
| branchlength += GET2(cc,1); |
| cc += 5; |
| break; |
| |
| default: |
| branchlength++; |
| } |
| break; |
| |
| /* Anything else is variable length */ |
| |
| default: |
| return -1; |
| } |
| } |
| /* Control never gets here */ |
| } |
| |
| |
| |
| |
| /************************************************* |
| * Scan compiled regex for numbered bracket * |
| *************************************************/ |
| |
| /* This little function scans through a compiled pattern until it finds a |
| capturing bracket with the given number. |
| |
| Arguments: |
| code points to start of expression |
| utf8 TRUE in UTF-8 mode |
| number the required bracket number |
| |
| Returns: pointer to the opcode for the bracket, or NULL if not found |
| */ |
| |
| static const uschar * |
| find_bracket(const uschar *code, BOOL utf8, int number) |
| { |
| for (;;) |
| { |
| register int c = *code; |
| if (c == OP_END) return NULL; |
| |
| /* XCLASS is used for classes that cannot be represented just by a bit |
| map. This includes negated single high-valued characters. The length in |
| the table is zero; the actual length is stored in the compiled code. */ |
| |
| if (c == OP_XCLASS) code += GET(code, 1); |
| |
| /* Handle capturing bracket */ |
| |
| else if (c == OP_CBRA) |
| { |
| int n = GET2(code, 1+LINK_SIZE); |
| if (n == number) return (uschar *)code; |
| code += _pcre_OP_lengths[c]; |
| } |
| |
| /* Otherwise, we can get the item's length from the table, except that for |
| repeated character types, we have to test for \p and \P, which have an extra |
| two bytes of parameters. */ |
| |
| else |
| { |
| switch(c) |
| { |
| case OP_TYPESTAR: |
| case OP_TYPEMINSTAR: |
| case OP_TYPEPLUS: |
| case OP_TYPEMINPLUS: |
| case OP_TYPEQUERY: |
| case OP_TYPEMINQUERY: |
| case OP_TYPEPOSSTAR: |
| case OP_TYPEPOSPLUS: |
| case OP_TYPEPOSQUERY: |
| if (code[1] == OP_PROP || code[1] == OP_NOTPROP) code += 2; |
| break; |
| |
| case OP_TYPEUPTO: |
| case OP_TYPEMINUPTO: |
| case OP_TYPEEXACT: |
| case OP_TYPEPOSUPTO: |
| if (code[3] == OP_PROP || code[3] == OP_NOTPROP) code += 2; |
| break; |
| } |
| |
| /* Add in the fixed length from the table */ |
| |
| code += _pcre_OP_lengths[c]; |
| |
| /* In UTF-8 mode, opcodes that are followed by a character may be followed by |
| a multi-byte character. The length in the table is a minimum, so we have to |
| arrange to skip the extra bytes. */ |
| |
| #ifdef SUPPORT_UTF8 |
| if (utf8) switch(c) |
| { |
| case OP_CHAR: |
| case OP_CHARNC: |
| case OP_EXACT: |
| case OP_UPTO: |
| case OP_MINUPTO: |
| case OP_POSUPTO: |
| case OP_STAR: |
| case OP_MINSTAR: |
| case OP_POSSTAR: |
| case OP_PLUS: |
| case OP_MINPLUS: |
| case OP_POSPLUS: |
| case OP_QUERY: |
| case OP_MINQUERY: |
| case OP_POSQUERY: |
| if (code[-1] >= 0xc0) code += _pcre_utf8_table4[code[-1] & 0x3f]; |
| break; |
| } |
| #endif |
| } |
| } |
| } |
| |
| |
| |
| /************************************************* |
| * Scan compiled regex for recursion reference * |
| *************************************************/ |
| |
| /* This little function scans through a compiled pattern until it finds an |
| instance of OP_RECURSE. |
| |
| Arguments: |
| code points to start of expression |
| utf8 TRUE in UTF-8 mode |
| |
| Returns: pointer to the opcode for OP_RECURSE, or NULL if not found |
| */ |
| |
| static const uschar * |
| find_recurse(const uschar *code, BOOL utf8) |
| { |
| for (;;) |
| { |
| register int c = *code; |
| if (c == OP_END) return NULL; |
| if (c == OP_RECURSE) return code; |
| |
| /* XCLASS is used for classes that cannot be represented just by a bit |
| map. This includes negated single high-valued characters. The length in |
| the table is zero; the actual length is stored in the compiled code. */ |
| |
| if (c == OP_XCLASS) code += GET(code, 1); |
| |
| /* Otherwise, we can get the item's length from the table, except that for |
| repeated character types, we have to test for \p and \P, which have an extra |
| two bytes of parameters. */ |
| |
| else |
| { |
| switch(c) |
| { |
| case OP_TYPESTAR: |
| case OP_TYPEMINSTAR: |
| case OP_TYPEPLUS: |
| case OP_TYPEMINPLUS: |
| case OP_TYPEQUERY: |
| case OP_TYPEMINQUERY: |
| case OP_TYPEPOSSTAR: |
| case OP_TYPEPOSPLUS: |
| case OP_TYPEPOSQUERY: |
| if (code[1] == OP_PROP || code[1] == OP_NOTPROP) code += 2; |
| break; |
| |
| case OP_TYPEPOSUPTO: |
| case OP_TYPEUPTO: |
| case OP_TYPEMINUPTO: |
| case OP_TYPEEXACT: |
| if (code[3] == OP_PROP || code[3] == OP_NOTPROP) code += 2; |
| break; |
| } |
| |
| /* Add in the fixed length from the table */ |
| |
| code += _pcre_OP_lengths[c]; |
| |
| /* In UTF-8 mode, opcodes that are followed by a character may be followed |
| by a multi-byte character. The length in the table is a minimum, so we have |
| to arrange to skip the extra bytes. */ |
| |
| #ifdef SUPPORT_UTF8 |
| if (utf8) switch(c) |
| { |
| case OP_CHAR: |
| case OP_CHARNC: |
| case OP_EXACT: |
| case OP_UPTO: |
| case OP_MINUPTO: |
| case OP_POSUPTO: |
| case OP_STAR: |
| case OP_MINSTAR: |
| case OP_POSSTAR: |
| case OP_PLUS: |
| case OP_MINPLUS: |
| case OP_POSPLUS: |
| case OP_QUERY: |
| case OP_MINQUERY: |
| case OP_POSQUERY: |
| if (code[-1] >= 0xc0) code += _pcre_utf8_table4[code[-1] & 0x3f]; |
| break; |
| } |
| #endif |
| } |
| } |
| } |
| |
| |
| |
| /************************************************* |
| * Scan compiled branch for non-emptiness * |
| *************************************************/ |
| |
| /* This function scans through a branch of a compiled pattern to see whether it |
| can match the empty string or not. It is called from could_be_empty() |
| below and from compile_branch() when checking for an unlimited repeat of a |
| group that can match nothing. Note that first_significant_code() skips over |
| assertions. If we hit an unclosed bracket, we return "empty" - this means we've |
| struck an inner bracket whose current branch will already have been scanned. |
| |
| Arguments: |
| code points to start of search |
| endcode points to where to stop |
| utf8 TRUE if in UTF8 mode |
| |
| Returns: TRUE if what is matched could be empty |
| */ |
| |
| static BOOL |
| could_be_empty_branch(const uschar *code, const uschar *endcode, BOOL utf8) |
| { |
| register int c; |
| for (code = first_significant_code(code + _pcre_OP_lengths[*code], NULL, 0, TRUE); |
| code < endcode; |
| code = first_significant_code(code + _pcre_OP_lengths[c], NULL, 0, TRUE)) |
| { |
| const uschar *ccode; |
| |
| c = *code; |
| |
| /* Groups with zero repeats can of course be empty; skip them. */ |
| |
| if (c == OP_BRAZERO || c == OP_BRAMINZERO) |
| { |
| code += _pcre_OP_lengths[c]; |
| do code += GET(code, 1); while (*code == OP_ALT); |
| c = *code; |
| continue; |
| } |
| |
| /* For other groups, scan the branches. */ |
| |
| if (c == OP_BRA || c == OP_CBRA || c == OP_ONCE || c == OP_COND) |
| { |
| BOOL empty_branch; |
| if (GET(code, 1) == 0) return TRUE; /* Hit unclosed bracket */ |
| |
| /* Scan a closed bracket */ |
| |
| empty_branch = FALSE; |
| do |
| { |
| if (!empty_branch && could_be_empty_branch(code, endcode, utf8)) |
| empty_branch = TRUE; |
| code += GET(code, 1); |
| } |
| while (*code == OP_ALT); |
| if (!empty_branch) return FALSE; /* All branches are non-empty */ |
| c = *code; |
| continue; |
| } |
| |
| /* Handle the other opcodes */ |
| |
| switch (c) |
| { |
| /* Check for quantifiers after a class. XCLASS is used for classes that |
| cannot be represented just by a bit map. This includes negated single |
| high-valued characters. The length in _pcre_OP_lengths[] is zero; the |
| actual length is stored in the compiled code, so we must update "code" |
| here. */ |
| |
| #ifdef SUPPORT_UTF8 |
| case OP_XCLASS: |
| ccode = code += GET(code, 1); |
| goto CHECK_CLASS_REPEAT; |
| #endif |
| |
| case OP_CLASS: |
| case OP_NCLASS: |
| ccode = code + 33; |
| |
| #ifdef SUPPORT_UTF8 |
| CHECK_CLASS_REPEAT: |
| #endif |
| |
| switch (*ccode) |
| { |
| case OP_CRSTAR: /* These could be empty; continue */ |
| case OP_CRMINSTAR: |
| case OP_CRQUERY: |
| case OP_CRMINQUERY: |
| break; |
| |
| default: /* Non-repeat => class must match */ |
| case OP_CRPLUS: /* These repeats aren't empty */ |
| case OP_CRMINPLUS: |
| return FALSE; |
| |
| case OP_CRRANGE: |
| case OP_CRMINRANGE: |
| if (GET2(ccode, 1) > 0) return FALSE; /* Minimum > 0 */ |
| break; |
| } |
| break; |
| |
| /* Opcodes that must match a character */ |
| |
| case OP_PROP: |
| case OP_NOTPROP: |
| case OP_EXTUNI: |
| case OP_NOT_DIGIT: |
| case OP_DIGIT: |
| case OP_NOT_WHITESPACE: |
| case OP_WHITESPACE: |
| case OP_NOT_WORDCHAR: |
| case OP_WORDCHAR: |
| case OP_ANY: |
| case OP_ANYBYTE: |
| case OP_CHAR: |
| case OP_CHARNC: |
| case OP_NOT: |
| case OP_PLUS: |
| case OP_MINPLUS: |
| case OP_POSPLUS: |
| case OP_EXACT: |
| case OP_NOTPLUS: |
| case OP_NOTMINPLUS: |
| case OP_NOTPOSPLUS: |
| case OP_NOTEXACT: |
| case OP_TYPEPLUS: |
| case OP_TYPEMINPLUS: |
| case OP_TYPEPOSPLUS: |
| case OP_TYPEEXACT: |
| return FALSE; |
| |
| /* These are going to continue, as they may be empty, but we have to |
| fudge the length for the \p and \P cases. */ |
| |
| case OP_TYPESTAR: |
| case OP_TYPEMINSTAR: |
| case OP_TYPEPOSSTAR: |
| case OP_TYPEQUERY: |
| case OP_TYPEMINQUERY: |
| case OP_TYPEPOSQUERY: |
| if (code[1] == OP_PROP || code[1] == OP_NOTPROP) code += 2; |
| break; |
| |
| /* Same for these */ |
| |
| case OP_TYPEUPTO: |
| case OP_TYPEMINUPTO: |
| case OP_TYPEPOSUPTO: |
| if (code[3] == OP_PROP || code[3] == OP_NOTPROP) code += 2; |
| break; |
| |
| /* End of branch */ |
| |
| case OP_KET: |
| case OP_KETRMAX: |
| case OP_KETRMIN: |
| case OP_ALT: |
| return TRUE; |
| |
| /* In UTF-8 mode, STAR, MINSTAR, POSSTAR, QUERY, MINQUERY, POSQUERY, UPTO, |
| MINUPTO, and POSUPTO may be followed by a multibyte character */ |
| |
| #ifdef SUPPORT_UTF8 |
| case OP_STAR: |
| case OP_MINSTAR: |
| case OP_POSSTAR: |
| case OP_QUERY: |
| case OP_MINQUERY: |
| case OP_POSQUERY: |
| case OP_UPTO: |
| case OP_MINUPTO: |
| case OP_POSUPTO: |
| if (utf8) while ((code[2] & 0xc0) == 0x80) code++; |
| break; |
| #endif |
| } |
| } |
| |
| return TRUE; |
| } |
| |
| |
| |
| /************************************************* |
| * Scan compiled regex for non-emptiness * |
| *************************************************/ |
| |
| /* This function is called to check for left recursive calls. We want to check |
| the current branch of the current pattern to see if it could match the empty |
| string. If it could, we must look outwards for branches at other levels, |
| stopping when we pass beyond the bracket which is the subject of the recursion. |
| |
| Arguments: |
| code points to start of the recursion |
| endcode points to where to stop (current RECURSE item) |
| bcptr points to the chain of current (unclosed) branch starts |
| utf8 TRUE if in UTF-8 mode |
| |
| Returns: TRUE if what is matched could be empty |
| */ |
| |
| static BOOL |
| could_be_empty(const uschar *code, const uschar *endcode, branch_chain *bcptr, |
| BOOL utf8) |
| { |
| while (bcptr != NULL && bcptr->current >= code) |
| { |
| if (!could_be_empty_branch(bcptr->current, endcode, utf8)) return FALSE; |
| bcptr = bcptr->outer; |
| } |
| return TRUE; |
| } |
| |
| |
| |
| /************************************************* |
| * Check for POSIX class syntax * |
| *************************************************/ |
| |
| /* This function is called when the sequence "[:" or "[." or "[=" is |
| encountered in a character class. It checks whether this is followed by an |
| optional ^ and then a sequence of letters, terminated by a matching ":]" or |
| ".]" or "=]". |
| |
| Argument: |
| ptr pointer to the initial [ |
| endptr where to return the end pointer |
| cd pointer to compile data |
| |
| Returns: TRUE or FALSE |
| */ |
| |
| static BOOL |
| check_posix_syntax(const uschar *ptr, const uschar **endptr, compile_data *cd) |
| { |
| int terminator; /* Don't combine these lines; the Solaris cc */ |
| terminator = *(++ptr); /* compiler warns about "non-constant" initializer. */ |
| if (*(++ptr) == '^') ptr++; |
| while ((cd->ctypes[*ptr] & ctype_letter) != 0) ptr++; |
| if (*ptr == terminator && ptr[1] == ']') |
| { |
| *endptr = ptr; |
| return TRUE; |
| } |
| return FALSE; |
| } |
| |
| |
| |
| |
| /************************************************* |
| * Check POSIX class name * |
| *************************************************/ |
| |
| /* This function is called to check the name given in a POSIX-style class entry |
| such as [:alnum:]. |
| |
| Arguments: |
| ptr points to the first letter |
| len the length of the name |
| |
| Returns: a value representing the name, or -1 if unknown |
| */ |
| |
| static int |
| check_posix_name(const uschar *ptr, int len) |
| { |
| const char *pn = posix_names; |
| register int yield = 0; |
| while (posix_name_lengths[yield] != 0) |
| { |
| if (len == posix_name_lengths[yield] && |
| strncmp((const char *)ptr, pn, len) == 0) return yield; |
| pn += posix_name_lengths[yield] + 1; |
| yield++; |
| } |
| return -1; |
| } |
| |
| |
| /************************************************* |
| * Adjust OP_RECURSE items in repeated group * |
| *************************************************/ |
| |
| /* OP_RECURSE items contain an offset from the start of the regex to the group |
| that is referenced. This means that groups can be replicated for fixed |
| repetition simply by copying (because the recursion is allowed to refer to |
| earlier groups that are outside the current group). However, when a group is |
| optional (i.e. the minimum quantifier is zero), OP_BRAZERO is inserted before |
| it, after it has been compiled. This means that any OP_RECURSE items within it |
| that refer to the group itself or any contained groups have to have their |
| offsets adjusted. That one of the jobs of this function. Before it is called, |
| the partially compiled regex must be temporarily terminated with OP_END. |
| |
| This function has been extended with the possibility of forward references for |
| recursions and subroutine calls. It must also check the list of such references |
| for the group we are dealing with. If it finds that one of the recursions in |
| the current group is on this list, it adjusts the offset in the list, not the |
| value in the reference (which is a group number). |
| |
| Arguments: |
| group points to the start of the group |
| adjust the amount by which the group is to be moved |
| utf8 TRUE in UTF-8 mode |
| cd contains pointers to tables etc. |
| save_hwm the hwm forward reference pointer at the start of the group |
| |
| Returns: nothing |
| */ |
| |
| static void |
| adjust_recurse(uschar *group, int adjust, BOOL utf8, compile_data *cd, |
| uschar *save_hwm) |
| { |
| uschar *ptr = group; |
| |
| while ((ptr = (uschar *)find_recurse(ptr, utf8)) != NULL) |
| { |
| int offset; |
| uschar *hc; |
| |
| /* See if this recursion is on the forward reference list. If so, adjust the |
| reference. */ |
| |
| for (hc = save_hwm; hc < cd->hwm; hc += LINK_SIZE) |
| { |
| offset = GET(hc, 0); |
| if (cd->start_code + offset == ptr + 1) |
| { |
| PUT(hc, 0, offset + adjust); |
| break; |
| } |
| } |
| |
| /* Otherwise, adjust the recursion offset if it's after the start of this |
| group. */ |
| |
| if (hc >= cd->hwm) |
| { |
| offset = GET(ptr, 1); |
| if (cd->start_code + offset >= group) PUT(ptr, 1, offset + adjust); |
| } |
| |
| ptr += 1 + LINK_SIZE; |
| } |
| } |
| |
| |
| |
| /************************************************* |
| * Insert an automatic callout point * |
| *************************************************/ |
| |
| /* This function is called when the PCRE_AUTO_CALLOUT option is set, to insert |
| callout points before each pattern item. |
| |
| Arguments: |
| code current code pointer |
| ptr current pattern pointer |
| cd pointers to tables etc |
| |
| Returns: new code pointer |
| */ |
| |
| static uschar * |
| auto_callout(uschar *code, const uschar *ptr, compile_data *cd) |
| { |
| *code++ = OP_CALLOUT; |
| *code++ = 255; |
| PUT(code, 0, ptr - cd->start_pattern); /* Pattern offset */ |
| PUT(code, LINK_SIZE, 0); /* Default length */ |
| return code + 2*LINK_SIZE; |
| } |
| |
| |
| |
| /************************************************* |
| * Complete a callout item * |
| *************************************************/ |
| |
| /* A callout item contains the length of the next item in the pattern, which |
| we can't fill in till after we have reached the relevant point. This is used |
| for both automatic and manual callouts. |
| |
| Arguments: |
| previous_callout points to previous callout item |
| ptr current pattern pointer |
| cd pointers to tables etc |
| |
| Returns: nothing |
| */ |
| |
| static void |
| complete_callout(uschar *previous_callout, const uschar *ptr, compile_data *cd) |
| { |
| int length = ptr - cd->start_pattern - GET(previous_callout, 2); |
| PUT(previous_callout, 2 + LINK_SIZE, length); |
| } |
| |
| |
| |
| #ifdef SUPPORT_UCP |
| /************************************************* |
| * Get othercase range * |
| *************************************************/ |
| |
| /* This function is passed the start and end of a class range, in UTF-8 mode |
| with UCP support. It searches up the characters, looking for internal ranges of |
| characters in the "other" case. Each call returns the next one, updating the |
| start address. |
| |
| Arguments: |
| cptr points to starting character value; updated |
| d end value |
| ocptr where to put start of othercase range |
| odptr where to put end of othercase range |
| |
| Yield: TRUE when range returned; FALSE when no more |
| */ |
| |
| static BOOL |
| get_othercase_range(unsigned int *cptr, unsigned int d, unsigned int *ocptr, |
| unsigned int *odptr) |
| { |
| unsigned int c, othercase, next; |
| |
| for (c = *cptr; c <= d; c++) |
| { if ((othercase = _pcre_ucp_othercase(c)) != NOTACHAR) break; } |
| |
| if (c > d) return FALSE; |
| |
| *ocptr = othercase; |
| next = othercase + 1; |
| |
| for (++c; c <= d; c++) |
| { |
| if (_pcre_ucp_othercase(c) != next) break; |
| next++; |
| } |
| |
| *odptr = next - 1; |
| *cptr = c; |
| |
| return TRUE; |
| } |
| #endif /* SUPPORT_UCP */ |
| |
| |
| |
| /************************************************* |
| * Check if auto-possessifying is possible * |
| *************************************************/ |
| |
| /* This function is called for unlimited repeats of certain items, to see |
| whether the next thing could possibly match the repeated item. If not, it makes |
| sense to automatically possessify the repeated item. |
| |
| Arguments: |
| op_code the repeated op code |
| this data for this item, depends on the opcode |
| utf8 TRUE in UTF-8 mode |
| utf8_char used for utf8 character bytes, NULL if not relevant |
| ptr next character in pattern |
| options options bits |
| cd contains pointers to tables etc. |
| |
| Returns: TRUE if possessifying is wanted |
| */ |
| |
| static BOOL |
| check_auto_possessive(int op_code, int item, BOOL utf8, uschar *utf8_char, |
| const uschar *ptr, int options, compile_data *cd) |
| { |
| int next; |
| |
| /* Skip whitespace and comments in extended mode */ |
| |
| if ((options & PCRE_EXTENDED) != 0) |
| { |
| for (;;) |
| { |
| while ((cd->ctypes[*ptr] & ctype_space) != 0) ptr++; |
| if (*ptr == '#') |
| { |
| while (*(++ptr) != 0) |
| if (IS_NEWLINE(ptr)) { ptr += cd->nllen; break; } |
| } |
| else break; |
| } |
| } |
| |
| /* If the next item is one that we can handle, get its value. A non-negative |
| value is a character, a negative value is an escape value. */ |
| |
| if (*ptr == '\\') |
| { |
| int temperrorcode = 0; |
| next = check_escape(&ptr, &temperrorcode, cd->bracount, options, FALSE); |
| if (temperrorcode != 0) return FALSE; |
| ptr++; /* Point after the escape sequence */ |
| } |
| |
| else if ((cd->ctypes[*ptr] & ctype_meta) == 0) |
| { |
| #ifdef SUPPORT_UTF8 |
| if (utf8) { GETCHARINC(next, ptr); } else |
| #endif |
| next = *ptr++; |
| } |
| |
| else return FALSE; |
| |
| /* Skip whitespace and comments in extended mode */ |
| |
| if ((options & PCRE_EXTENDED) != 0) |
| { |
| for (;;) |
| { |
| while ((cd->ctypes[*ptr] & ctype_space) != 0) ptr++; |
| if (*ptr == '#') |
| { |
| while (*(++ptr) != 0) |
| if (IS_NEWLINE(ptr)) { ptr += cd->nllen; break; } |
| } |
| else break; |
| } |
| } |
| |
| /* If the next thing is itself optional, we have to give up. */ |
| |
| if (*ptr == '*' || *ptr == '?' || strncmp((char *)ptr, "{0,", 3) == 0) |
| return FALSE; |
| |
| /* Now compare the next item with the previous opcode. If the previous is a |
| positive single character match, "item" either contains the character or, if |
| "item" is greater than 127 in utf8 mode, the character's bytes are in |
| utf8_char. */ |
| |
| |
| /* Handle cases when the next item is a character. */ |
| |
| if (next >= 0) switch(op_code) |
| { |
| case OP_CHAR: |
| #ifdef SUPPORT_UTF8 |
| if (utf8 && item > 127) { GETCHAR(item, utf8_char); } |
| #endif |
| return item != next; |
| |
| /* For CHARNC (caseless character) we must check the other case. If we have |
| Unicode property support, we can use it to test the other case of |
| high-valued characters. */ |
| |
| case OP_CHARNC: |
| #ifdef SUPPORT_UTF8 |
| if (utf8 && item > 127) { GETCHAR(item, utf8_char); } |
| #endif |
| if (item == next) return FALSE; |
| #ifdef SUPPORT_UTF8 |
| if (utf8) |
| { |
| unsigned int othercase; |
| if (next < 128) othercase = cd->fcc[next]; else |
| #ifdef SUPPORT_UCP |
| othercase = _pcre_ucp_othercase((unsigned int)next); |
| #else |
| othercase = NOTACHAR; |
| #endif |
| return (unsigned int)item != othercase; |
| } |
| else |
| #endif /* SUPPORT_UTF8 */ |
| return (item != cd->fcc[next]); /* Non-UTF-8 mode */ |
| |
| /* For OP_NOT, "item" must be a single-byte character. */ |
| |
| case OP_NOT: |
| if (next < 0) return FALSE; /* Not a character */ |
| if (item == next) return TRUE; |
| if ((options & PCRE_CASELESS) == 0) return FALSE; |
| #ifdef SUPPORT_UTF8 |
| if (utf8) |
| { |
| unsigned int othercase; |
| if (next < 128) othercase = cd->fcc[next]; else |
| #ifdef SUPPORT_UCP |
| othercase = _pcre_ucp_othercase(next); |
| #else |
| othercase = NOTACHAR; |
| #endif |
| return (unsigned int)item == othercase; |
| } |
| else |
| #endif /* SUPPORT_UTF8 */ |
| return (item == cd->fcc[next]); /* Non-UTF-8 mode */ |
| |
| case OP_DIGIT: |
| return next > 127 || (cd->ctypes[next] & ctype_digit) == 0; |
| |
| case OP_NOT_DIGIT: |
| return next <= 127 && (cd->ctypes[next] & ctype_digit) != 0; |
| |
| case OP_WHITESPACE: |
| return next > 127 || (cd->ctypes[next] & ctype_space) == 0; |
| |
| case OP_NOT_WHITESPACE: |
| return next <= 127 && (cd->ctypes[next] & ctype_space) != 0; |
| |
| case OP_WORDCHAR: |
| return next > 127 || (cd->ctypes[next] & ctype_word) == 0; |
| |
| case OP_NOT_WORDCHAR: |
| return next <= 127 && (cd->ctypes[next] & ctype_word) != 0; |
| |
| case OP_HSPACE: |
| case OP_NOT_HSPACE: |
| switch(next) |
| { |
| case 0x09: |
| case 0x20: |
| case 0xa0: |
| case 0x1680: |
| case 0x180e: |
| case 0x2000: |
| case 0x2001: |
| case 0x2002: |
| case 0x2003: |
| case 0x2004: |
| case 0x2005: |
| case 0x2006: |
| case 0x2007: |
| case 0x2008: |
| case 0x2009: |
| case 0x200A: |
| case 0x202f: |
| case 0x205f: |
| case 0x3000: |
| return op_code != OP_HSPACE; |
| default: |
| return op_code == OP_HSPACE; |
| } |
| |
| case OP_VSPACE: |
| case OP_NOT_VSPACE: |
| switch(next) |
| { |
| case 0x0a: |
| case 0x0b: |
| case 0x0c: |
| case 0x0d: |
| case 0x85: |
| case 0x2028: |
| case 0x2029: |
| return op_code != OP_VSPACE; |
| default: |
| return op_code == OP_VSPACE; |
| } |
| |
| default: |
| return FALSE; |
| } |
| |
| |
| /* Handle the case when the next item is \d, \s, etc. */ |
| |
| switch(op_code) |
| { |
| case OP_CHAR: |
| case OP_CHARNC: |
| #ifdef SUPPORT_UTF8 |
| if (utf8 && item > 127) { GETCHAR(item, utf8_char); } |
| #endif |
| switch(-next) |
| { |
| case ESC_d: |
| return item > 127 || (cd->ctypes[item] & ctype_digit) == 0; |
| |
| case ESC_D: |
| return item <= 127 && (cd->ctypes[item] & ctype_digit) != 0; |
| |
| case ESC_s: |
| return item > 127 || (cd->ctypes[item] & ctype_space) == 0; |
| |
| case ESC_S: |
| return item <= 127 && (cd->ctypes[item] & ctype_space) != 0; |
| |
| case ESC_w: |
| return item > 127 || (cd->ctypes[item] & ctype_word) == 0; |
| |
| case ESC_W: |
| return item <= 127 && (cd->ctypes[item] & ctype_word) != 0; |
| |
| case ESC_h: |
| case ESC_H: |
| switch(item) |
| { |
| case 0x09: |
| case 0x20: |
| case 0xa0: |
| case 0x1680: |
| case 0x180e: |
| case 0x2000: |
| case 0x2001: |
| case 0x2002: |
| case 0x2003: |
| case 0x2004: |
| case 0x2005: |
| case 0x2006: |
| case 0x2007: |
| case 0x2008: |
| case 0x2009: |
| case 0x200A: |
| case 0x202f: |
| case 0x205f: |
| case 0x3000: |
| return -next != ESC_h; |
| default: |
| return -next == ESC_h; |
| } |
| |
| case ESC_v: |
| case ESC_V: |
| switch(item) |
| { |
| case 0x0a: |
| case 0x0b: |
| case 0x0c: |
| case 0x0d: |
| case 0x85: |
| case 0x2028: |
| case 0x2029: |
| return -next != ESC_v; |
| default: |
| return -next == ESC_v; |
| } |
| |
| default: |
| return FALSE; |
| } |
| |
| case OP_DIGIT: |
| return next == -ESC_D || next == -ESC_s || next == -ESC_W || |
| next == -ESC_h || next == -ESC_v; |
| |
| case OP_NOT_DIGIT: |
| return next == -ESC_d; |
| |
| case OP_WHITESPACE: |
| return next == -ESC_S || next == -ESC_d || next == -ESC_w; |
| |
| case OP_NOT_WHITESPACE: |
| return next == -ESC_s || next == -ESC_h || next == -ESC_v; |
| |
| case OP_HSPACE: |
| return next == -ESC_S || next == -ESC_H || next == -ESC_d || next == -ESC_w; |
| |
| case OP_NOT_HSPACE: |
| return next == -ESC_h; |
| |
| /* Can't have \S in here because VT matches \S (Perl anomaly) */ |
| case OP_VSPACE: |
| return next == -ESC_V || next == -ESC_d || next == -ESC_w; |
| |
| case OP_NOT_VSPACE: |
| return next == -ESC_v; |
| |
| case OP_WORDCHAR: |
| return next == -ESC_W || next == -ESC_s || next == -ESC_h || next == -ESC_v; |
| |
| case OP_NOT_WORDCHAR: |
| return next == -ESC_w || next == -ESC_d; |
| |
| default: |
| return FALSE; |
| } |
| |
| /* Control does not reach here */ |
| } |
| |
| |
| |
| /************************************************* |
| * Compile one branch * |
| *************************************************/ |
| |
| /* Scan the pattern, compiling it into the a vector. If the options are |
| changed during the branch, the pointer is used to change the external options |
| bits. This function is used during the pre-compile phase when we are trying |
| to find out the amount of memory needed, as well as during the real compile |
| phase. The value of lengthptr distinguishes the two phases. |
| |
| Arguments: |
| optionsptr pointer to the option bits |
| codeptr points to the pointer to the current code point |
| ptrptr points to the current pattern pointer |
| errorcodeptr points to error code variable |
| firstbyteptr set to initial literal character, or < 0 (REQ_UNSET, REQ_NONE) |
| reqbyteptr set to the last literal character required, else < 0 |
| bcptr points to current branch chain |
| cd contains pointers to tables etc. |
| lengthptr NULL during the real compile phase |
| points to length accumulator during pre-compile phase |
| |
| Returns: TRUE on success |
| FALSE, with *errorcodeptr set non-zero on error |
| */ |
| |
| static BOOL |
| compile_branch(int *optionsptr, uschar **codeptr, const uschar **ptrptr, |
| int *errorcodeptr, int *firstbyteptr, int *reqbyteptr, branch_chain *bcptr, |
| compile_data *cd, int *lengthptr) |
| { |
| int repeat_type, op_type; |
| int repeat_min = 0, repeat_max = 0; /* To please picky compilers */ |
| int bravalue = 0; |
| int greedy_default, greedy_non_default; |
| int firstbyte, reqbyte; |
| int zeroreqbyte, zerofirstbyte; |
| int req_caseopt, reqvary, tempreqvary; |
| int options = *optionsptr; |
| int after_manual_callout = 0; |
| int length_prevgroup = 0; |
| register int c; |
| register uschar *code = *codeptr; |
| uschar *last_code = code; |
| uschar *orig_code = code; |
| uschar *tempcode; |
| BOOL inescq = FALSE; |
| BOOL groupsetfirstbyte = FALSE; |
| const uschar *ptr = *ptrptr; |
| const uschar *tempptr; |
| uschar *previous = NULL; |
| uschar *previous_callout = NULL; |
| uschar *save_hwm = NULL; |
| uschar classbits[32]; |
| |
| #ifdef SUPPORT_UTF8 |
| BOOL class_utf8; |
| BOOL utf8 = (options & PCRE_UTF8) != 0; |
| uschar *class_utf8data; |
| uschar utf8_char[6]; |
| #else |
| BOOL utf8 = FALSE; |
| uschar *utf8_char = NULL; |
| #endif |
| |
| #ifdef DEBUG |
| if (lengthptr != NULL) DPRINTF((">> start branch\n")); |
| #endif |
| |
| /* Set up the default and non-default settings for greediness */ |
| |
| greedy_default = ((options & PCRE_UNGREEDY) != 0); |
| greedy_non_default = greedy_default ^ 1; |
| |
| /* Initialize no first byte, no required byte. REQ_UNSET means "no char |
| matching encountered yet". It gets changed to REQ_NONE if we hit something that |
| matches a non-fixed char first char; reqbyte just remains unset if we never |
| find one. |
| |
| When we hit a repeat whose minimum is zero, we may have to adjust these values |
| to take the zero repeat into account. This is implemented by setting them to |
| zerofirstbyte and zeroreqbyte when such a repeat is encountered. The individual |
| item types that can be repeated set these backoff variables appropriately. */ |
| |
| firstbyte = reqbyte = zerofirstbyte = zeroreqbyte = REQ_UNSET; |
| |
| /* The variable req_caseopt contains either the REQ_CASELESS value or zero, |
| according to the current setting of the caseless flag. REQ_CASELESS is a bit |
| value > 255. It is added into the firstbyte or reqbyte variables to record the |
| case status of the value. This is used only for ASCII characters. */ |
| |
| req_caseopt = ((options & PCRE_CASELESS) != 0)? REQ_CASELESS : 0; |
| |
| /* Switch on next character until the end of the branch */ |
| |
| for (;; ptr++) |
| { |
| BOOL negate_class; |
| BOOL possessive_quantifier; |
| BOOL is_quantifier; |
| BOOL is_recurse; |
| BOOL reset_bracount; |
| int class_charcount; |
| int class_lastchar; |
| int newoptions; |
| int recno; |
| int refsign; |
| int skipbytes; |
| int subreqbyte; |
| int subfirstbyte; |
| int terminator; |
| int mclength; |
| uschar mcbuffer[8]; |
| |
| /* Get next byte in the pattern */ |
| |
| c = *ptr; |
| |
| /* If we are in the pre-compile phase, accumulate the length used for the |
| previous cycle of this loop. */ |
| |
| if (lengthptr != NULL) |
| { |
| #ifdef DEBUG |
| if (code > cd->hwm) cd->hwm = code; /* High water info */ |
| #endif |
| if (code > cd->start_workspace + COMPILE_WORK_SIZE) /* Check for overrun */ |
| { |
| *errorcodeptr = ERR52; |
| goto FAILED; |
| } |
| |
| /* There is at least one situation where code goes backwards: this is the |
| case of a zero quantifier after a class (e.g. [ab]{0}). At compile time, |
| the class is simply eliminated. However, it is created first, so we have to |
| allow memory for it. Therefore, don't ever reduce the length at this point. |
| */ |
| |
| if (code < last_code) code = last_code; |
| |
| /* Paranoid check for integer overflow */ |
| |
| if (OFLOW_MAX - *lengthptr < code - last_code) |
| { |
| *errorcodeptr = ERR20; |
| goto FAILED; |
| } |
| |
| *lengthptr += code - last_code; |
| DPRINTF(("length=%d added %d c=%c\n", *lengthptr, code - last_code, c)); |
| |
| /* If "previous" is set and it is not at the start of the work space, move |
| it back to there, in order to avoid filling up the work space. Otherwise, |
| if "previous" is NULL, reset the current code pointer to the start. */ |
| |
| if (previous != NULL) |
| { |
| if (previous > orig_code) |
| { |
| memmove(orig_code, previous, code - previous); |
| code -= previous - orig_code; |
| previous = orig_code; |
| } |
| } |
| else code = orig_code; |
| |
| /* Remember where this code item starts so we can pick up the length |
| next time round. */ |
| |
| last_code = code; |
| } |
| |
| /* In the real compile phase, just check the workspace used by the forward |
| reference list. */ |
| |
| else if (cd->hwm > cd->start_workspace + COMPILE_WORK_SIZE) |
| { |
| *errorcodeptr = ERR52; |
| goto FAILED; |
| } |
| |
| /* If in \Q...\E, check for the end; if not, we have a literal */ |
| |
| if (inescq && c != 0) |
| { |
| if (c == '\\' && ptr[1] == 'E') |
| { |
| inescq = FALSE; |
| ptr++; |
| continue; |
| } |
| else |
| { |
| if (previous_callout != NULL) |
| { |
| if (lengthptr == NULL) /* Don't attempt in pre-compile phase */ |
| complete_callout(previous_callout, ptr, cd); |
| previous_callout = NULL; |
| } |
| if ((options & PCRE_AUTO_CALLOUT) != 0) |
| { |
| previous_callout = code; |
| code = auto_callout(code, ptr, cd); |
| } |
| goto NORMAL_CHAR; |
| } |
| } |
| |
| /* Fill in length of a previous callout, except when the next thing is |
| a quantifier. */ |
| |
| is_quantifier = c == '*' || c == '+' || c == '?' || |
| (c == '{' && is_counted_repeat(ptr+1)); |
| |
| if (!is_quantifier && previous_callout != NULL && |
| after_manual_callout-- <= 0) |
| { |
| if (lengthptr == NULL) /* Don't attempt in pre-compile phase */ |
| complete_callout(previous_callout, ptr, cd); |
| previous_callout = NULL; |
| } |
| |
| /* In extended mode, skip white space and comments */ |
| |
| if ((options & PCRE_EXTENDED) != 0) |
| { |
| if ((cd->ctypes[c] & ctype_space) != 0) continue; |
| if (c == '#') |
| { |
| while (*(++ptr) != 0) |
| { |
| if (IS_NEWLINE(ptr)) { ptr += cd->nllen - 1; break; } |
| } |
| if (*ptr != 0) continue; |
| |
| /* Else fall through to handle end of string */ |
| c = 0; |
| } |
| } |
| |
| /* No auto callout for quantifiers. */ |
| |
| if ((options & PCRE_AUTO_CALLOUT) != 0 && !is_quantifier) |
| { |
| previous_callout = code; |
| code = auto_callout(code, ptr, cd); |
| } |
| |
| switch(c) |
| { |
| /* ===================================================================*/ |
| case 0: /* The branch terminates at string end */ |
| case '|': /* or | or ) */ |
| case ')': |
| *firstbyteptr = firstbyte; |
| *reqbyteptr = reqbyte; |
| *codeptr = code; |
| *ptrptr = ptr; |
| if (lengthptr != NULL) |
| { |
| if (OFLOW_MAX - *lengthptr < code - last_code) |
| { |
| *errorcodeptr = ERR20; |
| goto FAILED; |
| } |
| *lengthptr += code - last_code; /* To include callout length */ |
| DPRINTF((">> end branch\n")); |
| } |
| return TRUE; |
| |
| |
| /* ===================================================================*/ |
| /* Handle single-character metacharacters. In multiline mode, ^ disables |
| the setting of any following char as a first character. */ |
| |
| case '^': |
| if ((options & PCRE_MULTILINE) != 0) |
| { |
| if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE; |
| } |
| previous = NULL; |
| *code++ = OP_CIRC; |
| break; |
| |
| case '$': |
| previous = NULL; |
| *code++ = OP_DOLL; |
| break; |
| |
| /* There can never be a first char if '.' is first, whatever happens about |
| repeats. The value of reqbyte doesn't change either. */ |
| |
| case '.': |
| if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE; |
| zerofirstbyte = firstbyte; |
| zeroreqbyte = reqbyte; |
| previous = code; |
| *code++ = OP_ANY; |
| break; |
| |
| |
| /* ===================================================================*/ |
| /* Character classes. If the included characters are all < 256, we build a |
| 32-byte bitmap of the permitted characters, except in the special case |
| where there is only one such character. For negated classes, we build the |
| map as usual, then invert it at the end. However, we use a different opcode |
| so that data characters > 255 can be handled correctly. |
| |
| If the class contains characters outside the 0-255 range, a different |
| opcode is compiled. It may optionally have a bit map for characters < 256, |
| but those above are are explicitly listed afterwards. A flag byte tells |
| whether the bitmap is present, and whether this is a negated class or not. |
| */ |
| |
| case '[': |
| previous = code; |
| |
| /* PCRE supports POSIX class stuff inside a class. Perl gives an error if |
| they are encountered at the top level, so we'll do that too. */ |
| |
| if ((ptr[1] == ':' || ptr[1] == '.' || ptr[1] == '=') && |
| check_posix_syntax(ptr, &tempptr, cd)) |
| { |
| *errorcodeptr = (ptr[1] == ':')? ERR13 : ERR31; |
| goto FAILED; |
| } |
| |
| /* If the first character is '^', set the negation flag and skip it. Also, |
| if the first few characters (either before or after ^) are \Q\E or \E we |
| skip them too. This makes for compatibility with Perl. */ |
| |
| negate_class = FALSE; |
| for (;;) |
| { |
| c = *(++ptr); |
| if (c == '\\') |
| { |
| if (ptr[1] == 'E') ptr++; |
| else if (strncmp((const char *)ptr+1, "Q\\E", 3) == 0) ptr += 3; |
| else break; |
| } |
| else if (!negate_class && c == '^') |
| negate_class = TRUE; |
| else break; |
| } |
| |
| /* Keep a count of chars with values < 256 so that we can optimize the case |
| of just a single character (as long as it's < 256). However, For higher |
| valued UTF-8 characters, we don't yet do any optimization. */ |
| |
| class_charcount = 0; |
| class_lastchar = -1; |
| |
| /* Initialize the 32-char bit map to all zeros. We build the map in a |
| temporary bit of memory, in case the class contains only 1 character (less |
| than 256), because in that case the compiled code doesn't use the bit map. |
| */ |
| |
| memset(classbits, 0, 32 * sizeof(uschar)); |
| |
| #ifdef SUPPORT_UTF8 |
| class_utf8 = FALSE; /* No chars >= 256 */ |
| class_utf8data = code + LINK_SIZE + 2; /* For UTF-8 items */ |
| #endif |
| |
| /* Process characters until ] is reached. By writing this as a "do" it |
| means that an initial ] is taken as a data character. At the start of the |
| loop, c contains the first byte of the character. */ |
| |
| if (c != 0) do |
| { |
| const uschar *oldptr; |
| |
| #ifdef SUPPORT_UTF8 |
| if (utf8 && c > 127) |
| { /* Braces are required because the */ |
| GETCHARLEN(c, ptr, ptr); /* macro generates multiple statements */ |
| } |
| #endif |
| |
| /* Inside \Q...\E everything is literal except \E */ |
| |
| if (inescq) |
| { |
| if (c == '\\' && ptr[1] == 'E') /* If we are at \E */ |
| { |
| inescq = FALSE; /* Reset literal state */ |
| ptr++; /* Skip the 'E' */ |
| continue; /* Carry on with next */ |
| } |
| goto CHECK_RANGE; /* Could be range if \E follows */ |
| } |
| |
| /* Handle POSIX class names. Perl allows a negation extension of the |
| form [:^name:]. A square bracket that doesn't match the syntax is |
| treated as a literal. We also recognize the POSIX constructions |
| [.ch.] and [=ch=] ("collating elements") and fault them, as Perl |
| 5.6 and 5.8 do. */ |
| |
| if (c == '[' && |
| (ptr[1] == ':' || ptr[1] == '.' || ptr[1] == '=') && |
| check_posix_syntax(ptr, &tempptr, cd)) |
| { |
| BOOL local_negate = FALSE; |
| int posix_class, taboffset, tabopt; |
| register const uschar *cbits = cd->cbits; |
| uschar pbits[32]; |
| |
| if (ptr[1] != ':') |
| { |
| *errorcodeptr = ERR31; |
| goto FAILED; |
| } |
| |
| ptr += 2; |
| if (*ptr == '^') |
| { |
| local_negate = TRUE; |
| ptr++; |
| } |
| |
| posix_class = check_posix_name(ptr, tempptr - ptr); |
| if (posix_class < 0) |
| { |
| *errorcodeptr = ERR30; |
| goto FAILED; |
| } |
| |
| /* If matching is caseless, upper and lower are converted to |
| alpha. This relies on the fact that the class table starts with |
| alpha, lower, upper as the first 3 entries. */ |
| |
| if ((options & PCRE_CASELESS) != 0 && posix_class <= 2) |
| posix_class = 0; |
| |
| /* We build the bit map for the POSIX class in a chunk of local store |
| because we may be adding and subtracting from it, and we don't want to |
| subtract bits that may be in the main map already. At the end we or the |
| result into the bit map that is being built. */ |
| |
| posix_class *= 3; |
| |
| /* Copy in the first table (always present) */ |
| |
| memcpy(pbits, cbits + posix_class_maps[posix_class], |
| 32 * sizeof(uschar)); |
| |
| /* If there is a second table, add or remove it as required. */ |
| |
| taboffset = posix_class_maps[posix_class + 1]; |
| tabopt = posix_class_maps[posix_class + 2]; |
| |
| if (taboffset >= 0) |
| { |
| if (tabopt >= 0) |
| for (c = 0; c < 32; c++) pbits[c] |= cbits[c + taboffset]; |
| else |
| for (c = 0; c < 32; c++) pbits[c] &= ~cbits[c + taboffset]; |
| } |
| |
| /* Not see if we need to remove any special characters. An option |
| value of 1 removes vertical space and 2 removes underscore. */ |
| |
| if (tabopt < 0) tabopt = -tabopt; |
| if (tabopt == 1) pbits[1] &= ~0x3c; |
| else if (tabopt == 2) pbits[11] &= 0x7f; |
| |
| /* Add the POSIX table or its complement into the main table that is |
| being built and we are done. */ |
| |
| if (local_negate) |
| for (c = 0; c < 32; c++) classbits[c] |= ~pbits[c]; |
| else |
| for (c = 0; c < 32; c++) classbits[c] |= pbits[c]; |
| |
| ptr = tempptr + 1; |
| class_charcount = 10; /* Set > 1; assumes more than 1 per class */ |
| continue; /* End of POSIX syntax handling */ |
| } |
| |
| /* Backslash may introduce a single character, or it may introduce one |
| of the specials, which just set a flag. The sequence \b is a special |
| case. Inside a class (and only there) it is treated as backspace. |
| Elsewhere it marks a word boundary. Other escapes have preset maps ready |
| to 'or' into the one we are building. We assume they have more than one |
| character in them, so set class_charcount bigger than one. */ |
| |
| if (c == '\\') |
| { |
| c = check_escape(&ptr, errorcodeptr, cd->bracount, options, TRUE); |
| if (*errorcodeptr != 0) goto FAILED; |
| |
| if (-c == ESC_b) c = '\b'; /* \b is backslash in a class */ |
| else if (-c == ESC_X) c = 'X'; /* \X is literal X in a class */ |
| else if (-c == ESC_R) c = 'R'; /* \R is literal R in a class */ |
| else if (-c == ESC_Q) /* Handle start of quoted string */ |
| { |
| if (ptr[1] == '\\' && ptr[2] == 'E') |
| { |
| ptr += 2; /* avoid empty string */ |
| } |
| else inescq = TRUE; |
| continue; |
| } |
| else if (-c == ESC_E) continue; /* Ignore orphan \E */ |
| |
| if (c < 0) |
| { |
| register const uschar *cbits = cd->cbits; |
| class_charcount += 2; /* Greater than 1 is what matters */ |
| |
| /* Save time by not doing this in the pre-compile phase. */ |
| |
| if (lengthptr == NULL) switch (-c) |
| { |
| case ESC_d: |
| for (c = 0; c < 32; c++) classbits[c] |= cbits[c+cbit_digit]; |
| continue; |
| |
| case ESC_D: |
| for (c = 0; c < 32; c++) classbits[c] |= ~cbits[c+cbit_digit]; |
| continue; |
| |
| case ESC_w: |
| for (c = 0; c < 32; c++) classbits[c] |= cbits[c+cbit_word]; |
| continue; |
| |
| case ESC_W: |
| for (c = 0; c < 32; c++) classbits[c] |= ~cbits[c+cbit_word]; |
| continue; |
| |
| case ESC_s: |
| for (c = 0; c < 32; c++) classbits[c] |= cbits[c+cbit_space]; |
| classbits[1] &= ~0x08; /* Perl 5.004 onwards omits VT from \s */ |
| continue; |
| |
| case ESC_S: |
| for (c = 0; c < 32; c++) classbits[c] |= ~cbits[c+cbit_space]; |
| classbits[1] |= 0x08; /* Perl 5.004 onwards omits VT from \s */ |
| continue; |
| |
| case ESC_E: /* Perl ignores an orphan \E */ |
| continue; |
| |
| default: /* Not recognized; fall through */ |
| break; /* Need "default" setting to stop compiler warning. */ |
| } |
| |
| /* In the pre-compile phase, just do the recognition. */ |
| |
| else if (c == -ESC_d || c == -ESC_D || c == -ESC_w || |
| c == -ESC_W || c == -ESC_s || c == -ESC_S) continue; |
| |
| /* We need to deal with \H, \h, \V, and \v in both phases because |
| they use extra memory. */ |
| |
| if (-c == ESC_h) |
| { |
| SETBIT(classbits, 0x09); /* VT */ |
| SETBIT(classbits, 0x20); /* SPACE */ |
| SETBIT(classbits, 0xa0); /* NSBP */ |
| #ifdef SUPPORT_UTF8 |
| if (utf8) |
| { |
| class_utf8 = TRUE; |
| *class_utf8data++ = XCL_SINGLE; |
| class_utf8data += _pcre_ord2utf8(0x1680, class_utf8data); |
| *class_utf8data++ = XCL_SINGLE; |
| class_utf8data += _pcre_ord2utf8(0x180e, class_utf8data); |
| *class_utf8data++ = XCL_RANGE; |
| class_utf8data += _pcre_ord2utf8(0x2000, class_utf8data); |
| class_utf8data += _pcre_ord2utf8(0x200A, class_utf8data); |
| *class_utf8data++ = XCL_SINGLE; |
| class_utf8data += _pcre_ord2utf8(0x202f, class_utf8data); |
| *class_utf8data++ = XCL_SINGLE; |
| class_utf8data += _pcre_ord2utf8(0x205f, class_utf8data); |
| *class_utf8data++ = XCL_SINGLE; |
| class_utf8data += _pcre_ord2utf8(0x3000, class_utf8data); |
| } |
| #endif |
| continue; |
| } |
| |
| if (-c == ESC_H) |
| { |
| for (c = 0; c < 32; c++) |
| { |
| int x = 0xff; |
| switch (c) |
| { |
| case 0x09/8: x ^= 1 << (0x09%8); break; |
| case 0x20/8: x ^= 1 << (0x20%8); break; |
| case 0xa0/8: x ^= 1 << (0xa0%8); break; |
| default: break; |
| } |
| classbits[c] |= x; |
| } |
| |
| #ifdef SUPPORT_UTF8 |
| if (utf8) |
| { |
| class_utf8 = TRUE; |
| *class_utf8data++ = XCL_RANGE; |
| class_utf8data += _pcre_ord2utf8(0x0100, class_utf8data); |
| class_utf8data += _pcre_ord2utf8(0x167f, class_utf8data); |
| *class_utf8data++ = XCL_RANGE; |
| class_utf8data += _pcre_ord2utf8(0x1681, class_utf8data); |
| class_utf8data += _pcre_ord2utf8(0x180d, class_utf8data); |
| *class_utf8data++ = XCL_RANGE; |
| class_utf8data += _pcre_ord2utf8(0x180f, class_utf8data); |
| class_utf8data += _pcre_ord2utf8(0x1fff, class_utf8data); |
| *class_utf8data++ = XCL_RANGE; |
| class_utf8data += _pcre_ord2utf8(0x200B, class_utf8data); |
| class_utf8data += _pcre_ord2utf8(0x202e, class_utf8data); |
| *class_utf8data++ = XCL_RANGE; |
| class_utf8data += _pcre_ord2utf8(0x2030, class_utf8data); |
| class_utf8data += _pcre_ord2utf8(0x205e, class_utf8data); |
| *class_utf8data++ = XCL_RANGE; |
| class_utf8data += _pcre_ord2utf8(0x2060, class_utf8data); |
| class_utf8data += _pcre_ord2utf8(0x2fff, class_utf8data); |
| *class_utf8data++ = XCL_RANGE; |
| class_utf8data += _pcre_ord2utf8(0x3001, class_utf8data); |
| class_utf8data += _pcre_ord2utf8(0x7fffffff, class_utf8data); |
| } |
| #endif |
| continue; |
| } |
| |
| if (-c == ESC_v) |
| { |
| SETBIT(classbits, 0x0a); /* LF */ |
| SETBIT(classbits, 0x0b); /* VT */ |
| SETBIT(classbits, 0x0c); /* FF */ |
| SETBIT(classbits, 0x0d); /* CR */ |
| SETBIT(classbits, 0x85); /* NEL */ |
| #ifdef SUPPORT_UTF8 |
| if (utf8) |
| { |
| class_utf8 = TRUE; |
| *class_utf8data++ = XCL_RANGE; |
| class_utf8data += _pcre_ord2utf8(0x2028, class_utf8data); |
| class_utf8data += _pcre_ord2utf8(0x2029, class_utf8data); |
| } |
| #endif |
| continue; |
| } |
| |
| if (-c == ESC_V) |
| { |
| for (c = 0; c < 32; c++) |
| { |
| int x = 0xff; |
| switch (c) |
| { |
| case 0x0a/8: x ^= 1 << (0x0a%8); |
| x ^= 1 << (0x0b%8); |
| x ^= 1 << (0x0c%8); |
| x ^= 1 << (0x0d%8); |
| break; |
| case 0x85/8: x ^= 1 << (0x85%8); break; |
| default: break; |
| } |
| classbits[c] |= x; |
| } |
| |
| #ifdef SUPPORT_UTF8 |
| if (utf8) |
| { |
| class_utf8 = TRUE; |
| *class_utf8data++ = XCL_RANGE; |
| class_utf8data += _pcre_ord2utf8(0x0100, class_utf8data); |
| class_utf8data += _pcre_ord2utf8(0x2027, class_utf8data); |
| *class_utf8data++ = XCL_RANGE; |
| class_utf8data += _pcre_ord2utf8(0x2029, class_utf8data); |
| class_utf8data += _pcre_ord2utf8(0x7fffffff, class_utf8data); |
| } |
| #endif |
| continue; |
| } |
| |
| /* We need to deal with \P and \p in both phases. */ |
| |
| #ifdef SUPPORT_UCP |
| if (-c == ESC_p || -c == ESC_P) |
| { |
| BOOL negated; |
| int pdata; |
| int ptype = get_ucp(&ptr, &negated, &pdata, errorcodeptr); |
| if (ptype < 0) goto FAILED; |
| class_utf8 = TRUE; |
| *class_utf8data++ = ((-c == ESC_p) != negated)? |
| XCL_PROP : XCL_NOTPROP; |
| *class_utf8data++ = ptype; |
| *class_utf8data++ = pdata; |
| class_charcount -= 2; /* Not a < 256 character */ |
| continue; |
| } |
| #endif |
| /* Unrecognized escapes are faulted if PCRE is running in its |
| strict mode. By default, for compatibility with Perl, they are |
| treated as literals. */ |
| |
| if ((options & PCRE_EXTRA) != 0) |
| { |
| *errorcodeptr = ERR7; |
| goto FAILED; |
| } |
| |
| class_charcount -= 2; /* Undo the default count from above */ |
| c = *ptr; /* Get the final character and fall through */ |
| } |
| |
| /* Fall through if we have a single character (c >= 0). This may be |
| greater than 256 in UTF-8 mode. */ |
| |
| } /* End of backslash handling */ |
| |
| /* A single character may be followed by '-' to form a range. However, |
| Perl does not permit ']' to be the end of the range. A '-' character |
| at the end is treated as a literal. Perl ignores orphaned \E sequences |
| entirely. The code for handling \Q and \E is messy. */ |
| |
| CHECK_RANGE: |
| while (ptr[1] == '\\' && ptr[2] == 'E') |
| { |
| inescq = FALSE; |
| ptr += 2; |
| } |
| |
| oldptr = ptr; |
| |
| /* Remember \r or \n */ |
| |
| if (c == '\r' || c == '\n') cd->external_flags |= PCRE_HASCRORLF; |
| |
| /* Check for range */ |
| |
| if (!inescq && ptr[1] == '-') |
| { |
| int d; |
| ptr += 2; |
| while (*ptr == '\\' && ptr[1] == 'E') ptr += 2; |
| |
| /* If we hit \Q (not followed by \E) at this point, go into escaped |
| mode. */ |
| |
| while (*ptr == '\\' && ptr[1] == 'Q') |
| { |
| ptr += 2; |
| if (*ptr == '\\' && ptr[1] == 'E') { ptr += 2; continue; } |
| inescq = TRUE; |
| break; |
| } |
| |
| if (*ptr == 0 || (!inescq && *ptr == ']')) |
| { |
| ptr = oldptr; |
| goto LONE_SINGLE_CHARACTER; |
| } |
| |
| #ifdef SUPPORT_UTF8 |
| if (utf8) |
| { /* Braces are required because the */ |
| GETCHARLEN(d, ptr, ptr); /* macro generates multiple statements */ |
| } |
| else |
| #endif |
| d = *ptr; /* Not UTF-8 mode */ |
| |
| /* The second part of a range can be a single-character escape, but |
| not any of the other escapes. Perl 5.6 treats a hyphen as a literal |
| in such circumstances. */ |
| |
| if (!inescq && d == '\\') |
| { |
| d = check_escape(&ptr, errorcodeptr, cd->bracount, options, TRUE); |
| if (*errorcodeptr != 0) goto FAILED; |
| |
| /* \b is backslash; \X is literal X; \R is literal R; any other |
| special means the '-' was literal */ |
| |
| if (d < 0) |
| { |
| if (d == -ESC_b) d = '\b'; |
| else if (d == -ESC_X) d = 'X'; |
| else if (d == -ESC_R) d = 'R'; else |
| { |
| ptr = oldptr; |
| goto LONE_SINGLE_CHARACTER; /* A few lines below */ |
| } |
| } |
| } |
| |
| /* Check that the two values are in the correct order. Optimize |
| one-character ranges */ |
| |
| if (d < c) |
| { |
| *errorcodeptr = ERR8; |
| goto FAILED; |
| } |
| |
| if (d == c) goto LONE_SINGLE_CHARACTER; /* A few lines below */ |
| |
| /* Remember \r or \n */ |
| |
| if (d == '\r' || d == '\n') cd->external_flags |= PCRE_HASCRORLF; |
| |
| /* In UTF-8 mode, if the upper limit is > 255, or > 127 for caseless |
| matching, we have to use an XCLASS with extra data items. Caseless |
| matching for characters > 127 is available only if UCP support is |
| available. */ |
| |
| #ifdef SUPPORT_UTF8 |
| if (utf8 && (d > 255 || ((options & PCRE_CASELESS) != 0 && d > 127))) |
| { |
| class_utf8 = TRUE; |
| |
| /* With UCP support, we can find the other case equivalents of |
| the relevant characters. There may be several ranges. Optimize how |
| they fit with the basic range. */ |
| |
| #ifdef SUPPORT_UCP |
| if ((options & PCRE_CASELESS) != 0) |
| { |
| unsigned int occ, ocd; |
| unsigned int cc = c; |
| unsigned int origd = d; |
| while (get_othercase_range(&cc, origd, &occ, &ocd)) |
| { |
| if (occ >= (unsigned int)c && |
| ocd <= (unsigned int)d) |
| continue; /* Skip embedded ranges */ |
| |
| if (occ < (unsigned int)c && |
| ocd >= (unsigned int)c - 1) /* Extend the basic range */ |
| { /* if there is overlap, */ |
| c = occ; /* noting that if occ < c */ |
| continue; /* we can't have ocd > d */ |
| } /* because a subrange is */ |
| if (ocd > (unsigned int)d && |
| occ <= (unsigned int)d + 1) /* always shorter than */ |
| { /* the basic range. */ |
| d = ocd; |
| continue; |
| } |
| |
| if (occ == ocd) |
| { |
| *class_utf8data++ = XCL_SINGLE; |
| } |
| else |
| { |
| *class_utf8data++ = XCL_RANGE; |
| class_utf8data += _pcre_ord2utf8(occ, class_utf8data); |
| } |
| class_utf8data += _pcre_ord2utf8(ocd, class_utf8data); |
| } |
| } |
| #endif /* SUPPORT_UCP */ |
| |
| /* Now record the original range, possibly modified for UCP caseless |
| overlapping ranges. */ |
| |
| *class_utf8data++ = XCL_RANGE; |
| class_utf8data += _pcre_ord2utf8(c, class_utf8data); |
| class_utf8data += _pcre_ord2utf8(d, class_utf8data); |
| |
| /* With UCP support, we are done. Without UCP support, there is no |
| caseless matching for UTF-8 characters > 127; we can use the bit map |
| for the smaller ones. */ |
| |
| #ifdef SUPPORT_UCP |
| continue; /* With next character in the class */ |
| #else |
| if ((options & PCRE_CASELESS) == 0 || c > 127) continue; |
| |
| /* Adjust upper limit and fall through to set up the map */ |
| |
| d = 127; |
| |
| #endif /* SUPPORT_UCP */ |
| } |
| #endif /* SUPPORT_UTF8 */ |
| |
| /* We use the bit map for all cases when not in UTF-8 mode; else |
| ranges that lie entirely within 0-127 when there is UCP support; else |
| for partial ranges without UCP support. */ |
| |
| class_charcount += d - c + 1; |
| class_lastchar = d; |
| |
| /* We can save a bit of time by skipping this in the pre-compile. */ |
| |
| if (lengthptr == NULL) for (; c <= d; c++) |
| { |
| classbits[c/8] |= (1 << (c&7)); |
| if ((options & PCRE_CASELESS) != 0) |
| { |
| int uc = cd->fcc[c]; /* flip case */ |
| classbits[uc/8] |= (1 << (uc&7)); |
| } |
| } |
| |
| continue; /* Go get the next char in the class */ |
| } |
| |
| /* Handle a lone single character - we can get here for a normal |
| non-escape char, or after \ that introduces a single character or for an |
| apparent range that isn't. */ |
| |
| LONE_SINGLE_CHARACTER: |
| |
| /* Handle a character that cannot go in the bit map */ |
| |
| #ifdef SUPPORT_UTF8 |
| if (utf8 && (c > 255 || ((options & PCRE_CASELESS) != 0 && c > 127))) |
| { |
| class_utf8 = TRUE; |
| *class_utf8data++ = XCL_SINGLE; |
| class_utf8data += _pcre_ord2utf8(c, class_utf8data); |
| |
| #ifdef SUPPORT_UCP |
| if ((options & PCRE_CASELESS) != 0) |
| { |
| unsigned int othercase; |
| if ((othercase = _pcre_ucp_othercase(c)) != NOTACHAR) |
| { |
| *class_utf8data++ = XCL_SINGLE; |
| class_utf8data += _pcre_ord2utf8(othercase, class_utf8data); |
| } |
| } |
| #endif /* SUPPORT_UCP */ |
| |
| } |
| else |
| #endif /* SUPPORT_UTF8 */ |
| |
| /* Handle a single-byte character */ |
| { |
| classbits[c/8] |= (1 << (c&7)); |
| if ((options & PCRE_CASELESS) != 0) |
| { |
| c = cd->fcc[c]; /* flip case */ |
| classbits[c/8] |= (1 << (c&7)); |
| } |
| class_charcount++; |
| class_lastchar = c; |
| } |
| } |
| |
| /* Loop until ']' reached. This "while" is the end of the "do" above. */ |
| |
| while ((c = *(++ptr)) != 0 && (c != ']' || inescq)); |
| |
| if (c == 0) /* Missing terminating ']' */ |
| { |
| *errorcodeptr = ERR6; |
| goto FAILED; |
| } |
| |
| |
| /* This code has been disabled because it would mean that \s counts as |
| an explicit \r or \n reference, and that's not really what is wanted. Now |
| we set the flag only if there is a literal "\r" or "\n" in the class. */ |
| |
| #if 0 |
| /* Remember whether \r or \n are in this class */ |
| |
| if (negate_class) |
| { |
| if ((classbits[1] & 0x24) != 0x24) cd->external_flags |= PCRE_HASCRORLF; |
| } |
| else |
| { |
| if ((classbits[1] & 0x24) != 0) cd->external_flags |= PCRE_HASCRORLF; |
| } |
| #endif |
| |
| |
| /* If class_charcount is 1, we saw precisely one character whose value is |
| less than 256. As long as there were no characters >= 128 and there was no |
| use of \p or \P, in other words, no use of any XCLASS features, we can |
| optimize. |
| |
| In UTF-8 mode, we can optimize the negative case only if there were no |
| characters >= 128 because OP_NOT and the related opcodes like OP_NOTSTAR |
| operate on single-bytes only. This is an historical hangover. Maybe one day |
| we can tidy these opcodes to handle multi-byte characters. |
| |
| The optimization throws away the bit map. We turn the item into a |
| 1-character OP_CHAR[NC] if it's positive, or OP_NOT if it's negative. Note |
| that OP_NOT does not support multibyte characters. In the positive case, it |
| can cause firstbyte to be set. Otherwise, there can be no first char if |
| this item is first, whatever repeat count may follow. In the case of |
| reqbyte, save the previous value for reinstating. */ |
| |
| #ifdef SUPPORT_UTF8 |
| if (class_charcount == 1 && !class_utf8 && |
| (!utf8 || !negate_class || class_lastchar < 128)) |
| #else |
| if (class_charcount == 1) |
| #endif |
| { |
| zeroreqbyte = reqbyte; |
| |
| /* The OP_NOT opcode works on one-byte characters only. */ |
| |
| if (negate_class) |
| { |
| if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE; |
| zerofirstbyte = firstbyte; |
| *code++ = OP_NOT; |
| *code++ = class_lastchar; |
| break; |
| } |
| |
| /* For a single, positive character, get the value into mcbuffer, and |
| then we can handle this with the normal one-character code. */ |
| |
| #ifdef SUPPORT_UTF8 |
| if (utf8 && class_lastchar > 127) |
| mclength = _pcre_ord2utf8(class_lastchar, mcbuffer); |
| else |
| #endif |
| { |
| mcbuffer[0] = class_lastchar; |
| mclength = 1; |
| } |
| goto ONE_CHAR; |
| } /* End of 1-char optimization */ |
| |
| /* The general case - not the one-char optimization. If this is the first |
| thing in the branch, there can be no first char setting, whatever the |
| repeat count. Any reqbyte setting must remain unchanged after any kind of |
| repeat. */ |
| |
| if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE; |
| zerofirstbyte = firstbyte; |
| zeroreqbyte = reqbyte; |
| |
| /* If there are characters with values > 255, we have to compile an |
| extended class, with its own opcode. If there are no characters < 256, |
| we can omit the bitmap in the actual compiled code. */ |
| |
| #ifdef SUPPORT_UTF8 |
| if (class_utf8) |
| { |
| *class_utf8data++ = XCL_END; /* Marks the end of extra data */ |
| *code++ = OP_XCLASS; |
| code += LINK_SIZE; |
| *code = negate_class? XCL_NOT : 0; |
| |
| /* If the map is required, move up the extra data to make room for it; |
| otherwise just move the code pointer to the end of the extra data. */ |
| |
| if (class_charcount > 0) |
| { |
| *code++ |= XCL_MAP; |
| memmove(code + 32, code, class_utf8data - code); |
| memcpy(code, classbits, 32); |
| code = class_utf8data + 32; |
| } |
| else code = class_utf8data; |
| |
| /* Now fill in the complete length of the item */ |
| |
| PUT(previous, 1, code - previous); |
| break; /* End of class handling */ |
| } |
| #endif |
| |
| /* If there are no characters > 255, negate the 32-byte map if necessary, |
| and copy it into the code vector. If this is the first thing in the branch, |
| there can be no first char setting, whatever the repeat count. Any reqbyte |
| setting must remain unchanged after any kind of repeat. */ |
| |
| if (negate_class) |
| { |
| *code++ = OP_NCLASS; |
| if (lengthptr == NULL) /* Save time in the pre-compile phase */ |
| for (c = 0; c < 32; c++) code[c] = ~classbits[c]; |
| } |
| else |
| { |
| *code++ = OP_CLASS; |
| memcpy(code, classbits, 32); |
| } |
| code += 32; |
| break; |
| |
| |
| /* ===================================================================*/ |
| /* Various kinds of repeat; '{' is not necessarily a quantifier, but this |
| has been tested above. */ |
| |
| case '{': |
| if (!is_quantifier) goto NORMAL_CHAR; |
| ptr = read_repeat_counts(ptr+1, &repeat_min, &repeat_max, errorcodeptr); |
| if (*errorcodeptr != 0) goto FAILED; |
| goto REPEAT; |
| |
| case '*': |
| repeat_min = 0; |
| repeat_max = -1; |
| goto REPEAT; |
| |
| case '+': |
| repeat_min = 1; |
| repeat_max = -1; |
| goto REPEAT; |
| |
| case '?': |
| repeat_min = 0; |
| repeat_max = 1; |
| |
| REPEAT: |
| if (previous == NULL) |
| { |
| *errorcodeptr = ERR9; |
| goto FAILED; |
| } |
| |
| if (repeat_min == 0) |
| { |
| firstbyte = zerofirstbyte; /* Adjust for zero repeat */ |
| reqbyte = zeroreqbyte; /* Ditto */ |
| } |
| |
| /* Remember whether this is a variable length repeat */ |
| |
| reqvary = (repeat_min == repeat_max)? 0 : REQ_VARY; |
| |
| op_type = 0; /* Default single-char op codes */ |
| possessive_quantifier = FALSE; /* Default not possessive quantifier */ |
| |
| /* Save start of previous item, in case we have to move it up to make space |
| for an inserted OP_ONCE for the additional '+' extension. */ |
| |
| tempcode = previous; |
| |
| /* If the next character is '+', we have a possessive quantifier. This |
| implies greediness, whatever the setting of the PCRE_UNGREEDY option. |
| If the next character is '?' this is a minimizing repeat, by default, |
| but if PCRE_UNGREEDY is set, it works the other way round. We change the |
| repeat type to the non-default. */ |
| |
| if (ptr[1] == '+') |
| { |
| repeat_type = 0; /* Force greedy */ |
| possessive_quantifier = TRUE; |
| ptr++; |
| } |
| else if (ptr[1] == '?') |
| { |
| repeat_type = greedy_non_default; |
| ptr++; |
| } |
| else repeat_type = greedy_default; |
| |
| /* If previous was a character match, abolish the item and generate a |
| repeat item instead. If a char item has a minumum of more than one, ensure |
| that it is set in reqbyte - it might not be if a sequence such as x{3} is |
| the first thing in a branch because the x will have gone into firstbyte |
| instead. */ |
| |
| if (*previous == OP_CHAR || *previous == OP_CHARNC) |
| { |
| /* Deal with UTF-8 characters that take up more than one byte. It's |
| easier to write this out separately than try to macrify it. Use c to |
| hold the length of the character in bytes, plus 0x80 to flag that it's a |
| length rather than a small character. */ |
| |
| #ifdef SUPPORT_UTF8 |
| if (utf8 && (code[-1] & 0x80) != 0) |
| { |
| uschar *lastchar = code - 1; |
| while((*lastchar & 0xc0) == 0x80) lastchar--; |
| c = code - lastchar; /* Length of UTF-8 character */ |
| memcpy(utf8_char, lastchar, c); /* Save the char */ |
| c |= 0x80; /* Flag c as a length */ |
| } |
| else |
| #endif |
| |
| /* Handle the case of a single byte - either with no UTF8 support, or |
| with UTF-8 disabled, or for a UTF-8 character < 128. */ |
| |
| { |
| c = code[-1]; |
| if (repeat_min > 1) reqbyte = c | req_caseopt | cd->req_varyopt; |
| } |
| |
| /* If the repetition is unlimited, it pays to see if the next thing on |
| the line is something that cannot possibly match this character. If so, |
| automatically possessifying this item gains some performance in the case |
| where the match fails. */ |
| |
| if (!possessive_quantifier && |
| repeat_max < 0 && |
| check_auto_possessive(*previous, c, utf8, utf8_char, ptr + 1, |
| options, cd)) |
| { |
| repeat_type = 0; /* Force greedy */ |
| possessive_quantifier = TRUE; |
| } |
| |
| goto OUTPUT_SINGLE_REPEAT; /* Code shared with single character types */ |
| } |
| |
| /* If previous was a single negated character ([^a] or similar), we use |
| one of the special opcodes, replacing it. The code is shared with single- |
| character repeats by setting opt_type to add a suitable offset into |
| repeat_type. We can also test for auto-possessification. OP_NOT is |
| currently used only for single-byte chars. */ |
| |
| else if (*previous == OP_NOT) |
| { |
| op_type = OP_NOTSTAR - OP_STAR; /* Use "not" opcodes */ |
| c = previous[1]; |
| if (!possessive_quantifier && |
| repeat_max < 0 && |
| check_auto_possessive(OP_NOT, c, utf8, NULL, ptr + 1, options, cd)) |
| { |
| repeat_type = 0; /* Force greedy */ |
| possessive_quantifier = TRUE; |
| } |
| goto OUTPUT_SINGLE_REPEAT; |
| } |
| |
| /* If previous was a character type match (\d or similar), abolish it and |
| create a suitable repeat item. The code is shared with single-character |
| repeats by setting op_type to add a suitable offset into repeat_type. Note |
| the the Unicode property types will be present only when SUPPORT_UCP is |
| defined, but we don't wrap the little bits of code here because it just |
| makes it horribly messy. */ |
| |
| else if (*previous < OP_EODN) |
| { |
| uschar *oldcode; |
| int prop_type, prop_value; |
| op_type = OP_TYPESTAR - OP_STAR; /* Use type opcodes */ |
| c = *previous; |
| |
| if (!possessive_quantifier && |
| repeat_max < 0 && |
| check_auto_possessive(c, 0, utf8, NULL, ptr + 1, options, cd)) |
| { |
| repeat_type = 0; /* Force greedy */ |
| possessive_quantifier = TRUE; |
| } |
| |
| OUTPUT_SINGLE_REPEAT: |
| if (*previous == OP_PROP || *previous == OP_NOTPROP) |
| { |
| prop_type = previous[1]; |
| prop_value = previous[2]; |
| } |
| else prop_type = prop_value = -1; |
| |
| oldcode = code; |
| code = previous; /* Usually overwrite previous item */ |
| |
| /* If the maximum is zero then the minimum must also be zero; Perl allows |
| this case, so we do too - by simply omitting the item altogether. */ |
| |
| if (repeat_max == 0) goto END_REPEAT; |
| |
| /* All real repeats make it impossible to handle partial matching (maybe |
| one day we will be able to remove this restriction). */ |
| |
| if (repeat_max != 1) cd->external_flags |= PCRE_NOPARTIAL; |
| |
| /* Combine the op_type with the repeat_type */ |
| |
| repeat_type += op_type; |
| |
| /* A minimum of zero is handled either as the special case * or ?, or as |
| an UPTO, with the maximum given. */ |
| |
| if (repeat_min == 0) |
| { |
| if (repeat_max == -1) *code++ = OP_STAR + repeat_type; |
| else if (repeat_max == 1) *code++ = OP_QUERY + repeat_type; |
| else |
| { |
| *code++ = OP_UPTO + repeat_type; |
| PUT2INC(code, 0, repeat_max); |
| } |
| } |
| |
| /* A repeat minimum of 1 is optimized into some special cases. If the |
| maximum is unlimited, we use OP_PLUS. Otherwise, the original item is |
| left in place and, if the maximum is greater than 1, we use OP_UPTO with |
| one less than the maximum. */ |
| |
| else if (repeat_min == 1) |
| { |
| if (repeat_max == -1) |
| *code++ = OP_PLUS + repeat_type; |
| else |
| { |
| code = oldcode; /* leave previous item in place */ |
| if (repeat_max == 1) goto END_REPEAT; |
| *code++ = OP_UPTO + repeat_type; |
| PUT2INC(code, 0, repeat_max - 1); |
| } |
| } |
| |
| /* The case {n,n} is just an EXACT, while the general case {n,m} is |
| handled as an EXACT followed by an UPTO. */ |
| |
| else |
| { |
| *code++ = OP_EXACT + op_type; /* NB EXACT doesn't have repeat_type */ |
| PUT2INC(code, 0, repeat_min); |
| |
| /* If the maximum is unlimited, insert an OP_STAR. Before doing so, |
| we have to insert the character for the previous code. For a repeated |
| Unicode property match, there are two extra bytes that define the |
| required property. In UTF-8 mode, long characters have their length in |
| c, with the 0x80 bit as a flag. */ |
| |
| if (repeat_max < 0) |
| { |
| #ifdef SUPPORT_UTF8 |
| if (utf8 && c >= 128) |
| { |
| memcpy(code, utf8_char, c & 7); |
| code += c & 7; |
| } |
| else |
| #endif |
| { |
| *code++ = c; |
| if (prop_type >= 0) |
| { |
| *code++ = prop_type; |
| *code++ = prop_value; |
| } |
| } |
| *code++ = OP_STAR + repeat_type; |
| } |
| |
| /* Else insert an UPTO if the max is greater than the min, again |
| preceded by the character, for the previously inserted code. If the |
| UPTO is just for 1 instance, we can use QUERY instead. */ |
| |
| else if (repeat_max != repeat_min) |
| { |
| #ifdef SUPPORT_UTF8 |
| if (utf8 && c >= 128) |
| { |
| memcpy(code, utf8_char, c & 7); |
| code += c & 7; |
| } |
| else |
| #endif |
| *code++ = c; |
| if (prop_type >= 0) |
| { |
| *code++ = prop_type; |
| *code++ = prop_value; |
| } |
| repeat_max -= repeat_min; |
| |
| if (repeat_max == 1) |
| { |
| *code++ = OP_QUERY + repeat_type; |
| } |
| else |
| { |
| *code++ = OP_UPTO + repeat_type; |
| PUT2INC(code, 0, repeat_max); |
| } |
| } |
| } |
| |
| /* The character or character type itself comes last in all cases. */ |
| |
| #ifdef SUPPORT_UTF8 |
| if (utf8 && c >= 128) |
| { |
| memcpy(code, utf8_char, c & 7); |
| code += c & 7; |
| } |
| else |
| #endif |
| *code++ = c; |
| |
| /* For a repeated Unicode property match, there are two extra bytes that |
| define the required property. */ |
| |
| #ifdef SUPPORT_UCP |
| if (prop_type >= 0) |
| { |
| *code++ = prop_type; |
| *code++ = prop_value; |
| } |
| #endif |
| } |
| |
| /* If previous was a character class or a back reference, we put the repeat |
| stuff after it, but just skip the item if the repeat was {0,0}. */ |
| |
| else if (*previous == OP_CLASS || |
| *previous == OP_NCLASS || |
| #ifdef SUPPORT_UTF8 |
| *previous == OP_XCLASS || |
| #endif |
| *previous == OP_REF) |
| { |
| if (repeat_max == 0) |
| { |
| code = previous; |
| goto END_REPEAT; |
| } |
| |
| /* All real repeats make it impossible to handle partial matching (maybe |
| one day we will be able to remove this restriction). */ |
| |
| if (repeat_max != 1) cd->external_flags |= PCRE_NOPARTIAL; |
| |
| if (repeat_min == 0 && repeat_max == -1) |
| *code++ = OP_CRSTAR + repeat_type; |
| else if (repeat_min == 1 && repeat_max == -1) |
| *code++ = OP_CRPLUS + repeat_type; |
| else if (repeat_min == 0 && repeat_max == 1) |
| *code++ = OP_CRQUERY + repeat_type; |
| else |
| { |
| *code++ = OP_CRRANGE + repeat_type; |
| PUT2INC(code, 0, repeat_min); |
| if (repeat_max == -1) repeat_max = 0; /* 2-byte encoding for max */ |
| PUT2INC(code, 0, repeat_max); |
| } |
| } |
| |
| /* If previous was a bracket group, we may have to replicate it in certain |
| cases. */ |
| |
| else if (*previous == OP_BRA || *previous == OP_CBRA || |
| *previous == OP_ONCE || *previous == OP_COND) |
| { |
| register int i; |
| int ketoffset = 0; |
| int len = code - previous; |
| uschar *bralink = NULL; |
| |
| /* Repeating a DEFINE group is pointless */ |
| |
| if (*previous == OP_COND && previous[LINK_SIZE+1] == OP_DEF) |
| { |
| *errorcodeptr = ERR55; |
| goto FAILED; |
| } |
| |
| /* If the maximum repeat count is unlimited, find the end of the bracket |
| by scanning through from the start, and compute the offset back to it |
| from the current code pointer. There may be an OP_OPT setting following |
| the final KET, so we can't find the end just by going back from the code |
| pointer. */ |
| |
| if (repeat_max == -1) |
| { |
| register uschar *ket = previous; |
| do ket += GET(ket, 1); while (*ket != OP_KET); |
| ketoffset = code - ket; |
| } |
| |
| /* The case of a zero minimum is special because of the need to stick |
| OP_BRAZERO in front of it, and because the group appears once in the |
| data, whereas in other cases it appears the minimum number of times. For |
| this reason, it is simplest to treat this case separately, as otherwise |
| the code gets far too messy. There are several special subcases when the |
| minimum is zero. */ |
| |
| if (repeat_min == 0) |
| { |
| /* If the maximum is also zero, we just omit the group from the output |
| altogether. */ |
| |
| if (repeat_max == 0) |
| { |
| code = previous; |
| goto END_REPEAT; |
| } |
| |
| /* If the maximum is 1 or unlimited, we just have to stick in the |
| BRAZERO and do no more at this point. However, we do need to adjust |
| any OP_RECURSE calls inside the group that refer to the group itself or |
| any internal or forward referenced group, because the offset is from |
| the start of the whole regex. Temporarily terminate the pattern while |
| doing this. */ |
| |
| if (repeat_max <= 1) |
| { |
| *code = OP_END; |
| adjust_recurse(previous, 1, utf8, cd, save_hwm); |
| memmove(previous+1, previous, len); |
| code++; |
| *previous++ = OP_BRAZERO + repeat_type; |
| } |
| |
| /* If the maximum is greater than 1 and limited, we have to replicate |
| in a nested fashion, sticking OP_BRAZERO before each set of brackets. |
| The first one has to be handled carefully because it's the original |
| copy, which has to be moved up. The remainder can be handled by code |
| that is common with the non-zero minimum case below. We have to |
| adjust the value or repeat_max, since one less copy is required. Once |
| again, we may have to adjust any OP_RECURSE calls inside the group. */ |
| |
| else |
| { |
| int offset; |
| *code = OP_END; |
| adjust_recurse(previous, 2 + LINK_SIZE, utf8, cd, save_hwm); |
| memmove(previous + 2 + LINK_SIZE, previous, len); |
| code += 2 + LINK_SIZE; |
| *previous++ = OP_BRAZERO + repeat_type; |
| *previous++ = OP_BRA; |
| |
| /* We chain together the bracket offset fields that have to be |
| filled in later when the ends of the brackets are reached. */ |
| |
| offset = (bralink == NULL)? 0 : previous - bralink; |
| bralink = previous; |
| PUTINC(previous, 0, offset); |
| } |
| |
| repeat_max--; |
| } |
| |
| /* If the minimum is greater than zero, replicate the group as many |
| times as necessary, and adjust the maximum to the number of subsequent |
| copies that we need. If we set a first char from the group, and didn't |
| set a required char, copy the latter from the former. If there are any |
| forward reference subroutine calls in the group, there will be entries on |
| the workspace list; replicate these with an appropriate increment. */ |
| |
| else |
| { |
| if (repeat_min > 1) |
| { |
| /* In the pre-compile phase, we don't actually do the replication. We |
| just adjust the length as if we had. Do some paranoid checks for |
| potential integer overflow. */ |
| |
| if (lengthptr != NULL) |
| { |
| int delta = (repeat_min - 1)*length_prevgroup; |
| if ((double)(repeat_min - 1)*(double)length_prevgroup > |
| (double)INT_MAX || |
| OFLOW_MAX - *lengthptr < delta) |
| { |
| *errorcodeptr = ERR20; |
| goto FAILED; |
| } |
| *lengthptr += delta; |
| } |
| |
| /* This is compiling for real */ |
| |
| else |
| { |
| if (groupsetfirstbyte && reqbyte < 0) reqbyte = firstbyte; |
| for (i = 1; i < repeat_min; i++) |
| { |
| uschar *hc; |
| uschar *this_hwm = cd->hwm; |
| memcpy(code, previous, len); |
| for (hc = save_hwm; hc < this_hwm; hc += LINK_SIZE) |
| { |
| PUT(cd->hwm, 0, GET(hc, 0) + len); |
| cd->hwm += LINK_SIZE; |
| } |
| save_hwm = this_hwm; |
| code += len; |
| } |
| } |
| } |
| |
| if (repeat_max > 0) repeat_max -= repeat_min; |
| } |
| |
| /* This code is common to both the zero and non-zero minimum cases. If |
| the maximum is limited, it replicates the group in a nested fashion, |
| remembering the bracket starts on a stack. In the case of a zero minimum, |
| the first one was set up above. In all cases the repeat_max now specifies |
| the number of additional copies needed. Again, we must remember to |
| replicate entries on the forward reference list. */ |
| |
| if (repeat_max >= 0) |
| { |
| /* In the pre-compile phase, we don't actually do the replication. We |
| just adjust the length as if we had. For each repetition we must add 1 |
| to the length for BRAZERO and for all but the last repetition we must |
| add 2 + 2*LINKSIZE to allow for the nesting that occurs. Do some |
| paranoid checks to avoid integer overflow. */ |
| |
| if (lengthptr != NULL && repeat_max > 0) |
| { |
| int delta = repeat_max * (length_prevgroup + 1 + 2 + 2*LINK_SIZE) - |
| 2 - 2*LINK_SIZE; /* Last one doesn't nest */ |
| if ((double)repeat_max * |
| (double)(length_prevgroup + 1 + 2 + 2*LINK_SIZE) |
| > (double)INT_MAX || |
| OFLOW_MAX - *lengthptr < delta) |
| { |
| *errorcodeptr = ERR20; |
| goto FAILED; |
| } |
| *lengthptr += delta; |
| } |
| |
| /* This is compiling for real */ |
| |
| else for (i = repeat_max - 1; i >= 0; i--) |
| { |
| uschar *hc; |
| uschar *this_hwm = cd->hwm; |
| |
| *code++ = OP_BRAZERO + repeat_type; |
| |
| /* All but the final copy start a new nesting, maintaining the |
| chain of brackets outstanding. */ |
| |
| if (i != 0) |
| { |
| int offset; |
| *code++ = OP_BRA; |
| offset = (bralink == NULL)? 0 : code - bralink; |
| bralink = code; |
| PUTINC(code, 0, offset); |
| } |
| |
| memcpy(code, previous, len); |
| for (hc = save_hwm; hc < this_hwm; hc += LINK_SIZE) |
| { |
| PUT(cd->hwm, 0, GET(hc, 0) + len + ((i != 0)? 2+LINK_SIZE : 1)); |
| cd->hwm += LINK_SIZE; |
| } |
| save_hwm = this_hwm; |
| code += len; |
| } |
| |
| /* Now chain through the pending brackets, and fill in their length |
| fields (which are holding the chain links pro tem). */ |
| |
| while (bralink != NULL) |
| { |
| int oldlinkoffset; |
| int offset = code - bralink + 1; |
| uschar *bra = code - offset; |
| oldlinkoffset = GET(bra, 1); |
| bralink = (oldlinkoffset == 0)? NULL : bralink - oldlinkoffset; |
| *code++ = OP_KET; |
| PUTINC(code, 0, offset); |
| PUT(bra, 1, offset); |
| } |
| } |
| |
| /* If the maximum is unlimited, set a repeater in the final copy. We |
| can't just offset backwards from the current code point, because we |
| don't know if there's been an options resetting after the ket. The |
| correct offset was computed above. |
| |
| Then, when we are doing the actual compile phase, check to see whether |
| this group is a non-atomic one that could match an empty string. If so, |
| convert the initial operator to the S form (e.g. OP_BRA -> OP_SBRA) so |
| that runtime checking can be done. [This check is also applied to |
| atomic groups at runtime, but in a different way.] */ |
| |
| else |
| { |
| uschar *ketcode = code - ketoffset; |
| uschar *bracode = ketcode - GET(ketcode, 1); |
| *ketcode = OP_KETRMAX + repeat_type; |
| if (lengthptr == NULL && *bracode != OP_ONCE) |
| { |
| uschar *scode = bracode; |
| do |
| { |
| if (could_be_empty_branch(scode, ketcode, utf8)) |
| { |
| *bracode += OP_SBRA - OP_BRA; |
| break; |
| } |
| scode += GET(scode, 1); |
| } |
| while (*scode == OP_ALT); |
| } |
| } |
| } |
| |
| /* Else there's some kind of shambles */ |
| |
| else |
| { |
| *errorcodeptr = ERR11; |
| goto FAILED; |
| } |
| |
| /* If the character following a repeat is '+', or if certain optimization |
| tests above succeeded, possessive_quantifier is TRUE. For some of the |
| simpler opcodes, there is an special alternative opcode for this. For |
| anything else, we wrap the entire repeated item inside OP_ONCE brackets. |
| The '+' notation is just syntactic sugar, taken from Sun's Java package, |
| but the special opcodes can optimize it a bit. The repeated item starts at |
| tempcode, not at previous, which might be the first part of a string whose |
| (former) last char we repeated. |
| |
| Possessifying an 'exact' quantifier has no effect, so we can ignore it. But |
| an 'upto' may follow. We skip over an 'exact' item, and then test the |
| length of what remains before proceeding. */ |
| |
| if (possessive_quantifier) |
| { |
| int len; |
| if (*tempcode == OP_EXACT || *tempcode == OP_TYPEEXACT || |
| *tempcode == OP_NOTEXACT) |
| tempcode += _pcre_OP_lengths[*tempcode]; |
| len = code - tempcode; |
| if (len > 0) switch (*tempcode) |
| { |
| case OP_STAR: *tempcode = OP_POSSTAR; break; |
| case OP_PLUS: *tempcode = OP_POSPLUS; break; |
| case OP_QUERY: *tempcode = OP_POSQUERY; break; |
| case OP_UPTO: *tempcode = OP_POSUPTO; break; |
| |
| case OP_TYPESTAR: *tempcode = OP_TYPEPOSSTAR; break; |
| case OP_TYPEPLUS: *tempcode = OP_TYPEPOSPLUS; break; |
| case OP_TYPEQUERY: *tempcode = OP_TYPEPOSQUERY; break; |
| case OP_TYPEUPTO: *tempcode = OP_TYPEPOSUPTO; break; |
| |
| case OP_NOTSTAR: *tempcode = OP_NOTPOSSTAR; break; |
| case OP_NOTPLUS: *tempcode = OP_NOTPOSPLUS; break; |
| case OP_NOTQUERY: *tempcode = OP_NOTPOSQUERY; break; |
| case OP_NOTUPTO: *tempcode = OP_NOTPOSUPTO; break; |
| |
| default: |
| memmove(tempcode + 1+LINK_SIZE, tempcode, len); |
| code += 1 + LINK_SIZE; |
| len += 1 + LINK_SIZE; |
| tempcode[0] = OP_ONCE; |
| *code++ = OP_KET; |
| PUTINC(code, 0, len); |
| PUT(tempcode, 1, len); |
| break; |
| } |
| } |
| |
| /* In all case we no longer have a previous item. We also set the |
| "follows varying string" flag for subsequently encountered reqbytes if |
| it isn't already set and we have just passed a varying length item. */ |
| |
| END_REPEAT: |
| previous = NULL; |
| cd->req_varyopt |= reqvary; |
| break; |
| |
| |
| /* ===================================================================*/ |
| /* Start of nested parenthesized sub-expression, or comment or lookahead or |
| lookbehind or option setting or condition or all the other extended |
| parenthesis forms. */ |
| |
| case '(': |
| newoptions = options; |
| skipbytes = 0; |
| bravalue = OP_CBRA; |
| save_hwm = cd->hwm; |
| reset_bracount = FALSE; |
| |
| /* First deal with various "verbs" that can be introduced by '*'. */ |
| |
| if (*(++ptr) == '*' && (cd->ctypes[ptr[1]] & ctype_letter) != 0) |
| { |
| int i, namelen; |
| const char *vn = verbnames; |
| const uschar *name = ++ptr; |
| previous = NULL; |
| while ((cd->ctypes[*++ptr] & ctype_letter) != 0); |
| if (*ptr == ':') |
| { |
| *errorcodeptr = ERR59; /* Not supported */ |
| goto FAILED; |
| } |
| if (*ptr != ')') |
| { |
| *errorcodeptr = ERR60; |
| goto FAILED; |
| } |
| namelen = ptr - name; |
| for (i = 0; i < verbcount; i++) |
| { |
| if (namelen == verbs[i].len && |
| strncmp((char *)name, vn, namelen) == 0) |
| { |
| *code = verbs[i].op; |
| if (*code++ == OP_ACCEPT) cd->had_accept = TRUE; |
| break; |
| } |
| vn += verbs[i].len + 1; |
| } |
| if (i < verbcount) continue; |
| *errorcodeptr = ERR60; |
| goto FAILED; |
| } |
| |
| /* Deal with the extended parentheses; all are introduced by '?', and the |
| appearance of any of them means that this is not a capturing group. */ |
| |
| else if (*ptr == '?') |
| { |
| int i, set, unset, namelen; |
| int *optset; |
| const uschar *name; |
| uschar *slot; |
| |
| switch (*(++ptr)) |
| { |
| case '#': /* Comment; skip to ket */ |
| ptr++; |
| while (*ptr != 0 && *ptr != ')') ptr++; |
| if (*ptr == 0) |
| { |
| *errorcodeptr = ERR18; |
| goto FAILED; |
| } |
| continue; |
| |
| |
| /* ------------------------------------------------------------ */ |
| case '|': /* Reset capture count for each branch */ |
| reset_bracount = TRUE; |
| /* Fall through */ |
| |
| /* ------------------------------------------------------------ */ |
| case ':': /* Non-capturing bracket */ |
| bravalue = OP_BRA; |
| ptr++; |
| break; |
| |
| |
| /* ------------------------------------------------------------ */ |
| case '(': |
| bravalue = OP_COND; /* Conditional group */ |
| |
| /* A condition can be an assertion, a number (referring to a numbered |
| group), a name (referring to a named group), or 'R', referring to |
| recursion. R<digits> and R&name are also permitted for recursion tests. |
| |
| There are several syntaxes for testing a named group: (?(name)) is used |
| by Python; Perl 5.10 onwards uses (?(<name>) or (?('name')). |
| |
| There are two unfortunate ambiguities, caused by history. (a) 'R' can |
| be the recursive thing or the name 'R' (and similarly for 'R' followed |
| by digits), and (b) a number could be a name that consists of digits. |
| In both cases, we look for a name first; if not found, we try the other |
| cases. */ |
| |
| /* For conditions that are assertions, check the syntax, and then exit |
| the switch. This will take control down to where bracketed groups, |
| including assertions, are processed. */ |
| |
| if (ptr[1] == '?' && (ptr[2] == '=' || ptr[2] == '!' || ptr[2] == '<')) |
| break; |
| |
| /* Most other conditions use OP_CREF (a couple change to OP_RREF |
| below), and all need to skip 3 bytes at the start of the group. */ |
| |
| code[1+LINK_SIZE] = OP_CREF; |
| skipbytes = 3; |
| refsign = -1; |
| |
| /* Check for a test for recursion in a named group. */ |
| |
| if (ptr[1] == 'R' && ptr[2] == '&') |
| { |
| terminator = -1; |
| ptr += 2; |
| code[1+LINK_SIZE] = OP_RREF; /* Change the type of test */ |
| } |
| |
| /* Check for a test for a named group's having been set, using the Perl |
| syntax (?(<name>) or (?('name') */ |
| |
| else if (ptr[1] == '<') |
| { |
| terminator = '>'; |
| ptr++; |
| } |
| else if (ptr[1] == '\'') |
| { |
| terminator = '\''; |
| ptr++; |
| } |
| else |
| { |
| terminator = 0; |
| if (ptr[1] == '-' || ptr[1] == '+') refsign = *(++ptr); |
| } |
| |
| /* We now expect to read a name; any thing else is an error */ |
| |
| if ((cd->ctypes[ptr[1]] & ctype_word) == 0) |
| { |
| ptr += 1; /* To get the right offset */ |
| *errorcodeptr = ERR28; |
| goto FAILED; |
| } |
| |
| /* Read the name, but also get it as a number if it's all digits */ |
| |
| recno = 0; |
| name = ++ptr; |
| while ((cd->ctypes[*ptr] & ctype_word) != 0) |
| { |
| if (recno >= 0) |
| recno = (g_ascii_isdigit(*ptr) != 0)? |
| recno * 10 + *ptr - '0' : -1; |
| ptr++; |
| } |
| namelen = ptr - name; |
| |
| if ((terminator > 0 && *ptr++ != terminator) || *ptr++ != ')') |
| { |
| ptr--; /* Error offset */ |
| *errorcodeptr = ERR26; |
| goto FAILED; |
| } |
| |
| /* Do no further checking in the pre-compile phase. */ |
| |
| if (lengthptr != NULL) break; |
| |
| /* In the real compile we do the work of looking for the actual |
| reference. If the string started with "+" or "-" we require the rest to |
| be digits, in which case recno will be set. */ |
| |
| if (refsign > 0) |
| { |
| if (recno <= 0) |
| { |
| *errorcodeptr = ERR58; |
| goto FAILED; |
| } |
| if (refsign == '-') |
| { |
| recno = cd->bracount - recno + 1; |
| if (recno <= 0) |
| { |
| *errorcodeptr = ERR15; |
| goto FAILED; |
| } |
| } |
| else recno += cd->bracount; |
| PUT2(code, 2+LINK_SIZE, recno); |
| break; |
| } |
| |
| /* Otherwise (did not start with "+" or "-"), start by looking for the |
| name. */ |
| |
| slot = cd->name_table; |
| for (i = 0; i < cd->names_found; i++) |
| { |
| if (strncmp((char *)name, (char *)slot+2, namelen) == 0) break; |
| slot += cd->name_entry_size; |
| } |
| |
| /* Found a previous named subpattern */ |
| |
| if (i < cd->names_found) |
| { |
| recno = GET2(slot, 0); |
| PUT2(code, 2+LINK_SIZE, recno); |
| } |
| |
| /* Search the pattern for a forward reference */ |
| |
| else if ((i = find_parens(ptr, cd->bracount, name, namelen, |
| (options & PCRE_EXTENDED) != 0)) > 0) |
| { |
| PUT2(code, 2+LINK_SIZE, i); |
| } |
| |
| /* If terminator == 0 it means that the name followed directly after |
| the opening parenthesis [e.g. (?(abc)...] and in this case there are |
| some further alternatives to try. For the cases where terminator != 0 |
| [things like (?(<name>... or (?('name')... or (?(R&name)... ] we have |
| now checked all the possibilities, so give an error. */ |
| |
| else if (terminator != 0) |
| { |
| *errorcodeptr = ERR15; |
| goto FAILED; |
| } |
| |
| /* Check for (?(R) for recursion. Allow digits after R to specify a |
| specific group number. */ |
| |
| else if (*name == 'R') |
| { |
| recno = 0; |
| for (i = 1; i < namelen; i++) |
| { |
| if (g_ascii_isdigit(name[i]) == 0) |
| { |
| *errorcodeptr = ERR15; |
| goto FAILED; |
| } |
| recno = recno * 10 + name[i] - '0'; |
| } |
| if (recno == 0) recno = RREF_ANY; |
| code[1+LINK_SIZE] = OP_RREF; /* Change test type */ |
| PUT2(code, 2+LINK_SIZE, recno); |
| } |
| |
| /* Similarly, check for the (?(DEFINE) "condition", which is always |
| false. */ |
| |
| else if (namelen == 6 && strncmp((char *)name, "DEFINE", 6) == 0) |
| { |
| code[1+LINK_SIZE] = OP_DEF; |
| skipbytes = 1; |
| } |
| |
| /* Check for the "name" actually being a subpattern number. */ |
| |
| else if (recno > 0) |
| { |
| PUT2(code, 2+LINK_SIZE, recno); |
| } |
| |
| /* Either an unidentified subpattern, or a reference to (?(0) */ |
| |
| else |
| { |
| *errorcodeptr = (recno == 0)? ERR35: ERR15; |
| goto FAILED; |
| } |
| break; |
| |
| |
| /* ------------------------------------------------------------ */ |
| case '=': /* Positive lookahead */ |
| bravalue = OP_ASSERT; |
| ptr++; |
| break; |
| |
| |
| /* ------------------------------------------------------------ */ |
| case '!': /* Negative lookahead */ |
| ptr++; |
| if (*ptr == ')') /* Optimize (?!) */ |
| { |
| *code++ = OP_FAIL; |
| previous = NULL; |
| continue; |
| } |
| bravalue = OP_ASSERT_NOT; |
| break; |
| |
| |
| /* ------------------------------------------------------------ */ |
| case '<': /* Lookbehind or named define */ |
| switch (ptr[1]) |
| { |
| case '=': /* Positive lookbehind */ |
| bravalue = OP_ASSERTBACK; |
| ptr += 2; |
| break; |
| |
| case '!': /* Negative lookbehind */ |
| bravalue = OP_ASSERTBACK_NOT; |
| ptr += 2; |
| break; |
| |
| default: /* Could be name define, else bad */ |
| if ((cd->ctypes[ptr[1]] & ctype_word) != 0) goto DEFINE_NAME; |
| ptr++; /* Correct offset for error */ |
| *errorcodeptr = ERR24; |
| goto FAILED; |
| } |
| break; |
| |
| |
| /* ------------------------------------------------------------ */ |
| case '>': /* One-time brackets */ |
| bravalue = OP_ONCE; |
| ptr++; |
| break; |
| |
| |
| /* ------------------------------------------------------------ */ |
| case 'C': /* Callout - may be followed by digits; */ |
| previous_callout = code; /* Save for later completion */ |
| after_manual_callout = 1; /* Skip one item before completing */ |
| *code++ = OP_CALLOUT; |
| { |
| int n = 0; |
| while (g_ascii_isdigit(*(++ptr)) != 0) |
| n = n * 10 + *ptr - '0'; |
| if (*ptr != ')') |
| { |
| *errorcodeptr = ERR39; |
| goto FAILED; |
| } |
| if (n > 255) |
| { |
| *errorcodeptr = ERR38; |
| goto FAILED; |
| } |
| *code++ = n; |
| PUT(code, 0, ptr - cd->start_pattern + 1); /* Pattern offset */ |
| PUT(code, LINK_SIZE, 0); /* Default length */ |
| code += 2 * LINK_SIZE; |
| } |
| previous = NULL; |
| continue; |
| |
| |
| /* ------------------------------------------------------------ */ |
| case 'P': /* Python-style named subpattern handling */ |
| if (*(++ptr) == '=' || *ptr == '>') /* Reference or recursion */ |
| { |
| is_recurse = *ptr == '>'; |
| terminator = ')'; |
| goto NAMED_REF_OR_RECURSE; |
| } |
| else if (*ptr != '<') /* Test for Python-style definition */ |
| { |
| *errorcodeptr = ERR41; |
| goto FAILED; |
| } |
| /* Fall through to handle (?P< as (?< is handled */ |
| |
| |
| /* ------------------------------------------------------------ */ |
| DEFINE_NAME: /* Come here from (?< handling */ |
| case '\'': |
| { |
| terminator = (*ptr == '<')? '>' : '\''; |
| name = ++ptr; |
| |
| while ((cd->ctypes[*ptr] & ctype_word) != 0) ptr++; |
| namelen = ptr - name; |
| |
| /* In the pre-compile phase, just do a syntax check. */ |
| |
| if (lengthptr != NULL) |
| { |
| if (*ptr != terminator) |
| { |
| *errorcodeptr = ERR42; |
| goto FAILED; |
| } |
| if (cd->names_found >= MAX_NAME_COUNT) |
| { |
| *errorcodeptr = ERR49; |
| goto FAILED; |
| } |
| if (namelen + 3 > cd->name_entry_size) |
| { |
| cd->name_entry_size = namelen + 3; |
| if (namelen > MAX_NAME_SIZE) |
| { |
| *errorcodeptr = ERR48; |
| goto FAILED; |
| } |
| } |
| } |
| |
| /* In the real compile, create the entry in the table */ |
| |
| else |
| { |
| slot = cd->name_table; |
| for (i = 0; i < cd->names_found; i++) |
| { |
| int crc = memcmp(name, slot+2, namelen); |
| if (crc == 0) |
| { |
| if (slot[2+namelen] == 0) |
| { |
| if ((options & PCRE_DUPNAMES) == 0) |
| { |
| *errorcodeptr = ERR43; |
| goto FAILED; |
| } |
| } |
| else crc = -1; /* Current name is substring */ |
| } |
| if (crc < 0) |
| { |
| memmove(slot + cd->name_entry_size, slot, |
| (cd->names_found - i) * cd->name_entry_size); |
| break; |
| } |
| slot += cd->name_entry_size; |
| } |
| |
| PUT2(slot, 0, cd->bracount + 1); |
| memcpy(slot + 2, name, namelen); |
| slot[2+namelen] = 0; |
| } |
| } |
| |
| /* In both cases, count the number of names we've encountered. */ |
| |
| ptr++; /* Move past > or ' */ |
| cd->names_found++; |
| goto NUMBERED_GROUP; |
| |
| |
| /* ------------------------------------------------------------ */ |
| case '&': /* Perl recursion/subroutine syntax */ |
| terminator = ')'; |
| is_recurse = TRUE; |
| /* Fall through */ |
| |
| /* We come here from the Python syntax above that handles both |
| references (?P=name) and recursion (?P>name), as well as falling |
| through from the Perl recursion syntax (?&name). */ |
| |
| NAMED_REF_OR_RECURSE: |
| name = ++ptr; |
| while ((cd->ctypes[*ptr] & ctype_word) != 0) ptr++; |
| namelen = ptr - name; |
| |
| /* In the pre-compile phase, do a syntax check and set a dummy |
| reference number. */ |
| |
| if (lengthptr != NULL) |
| { |
| if (*ptr != terminator) |
| { |
| *errorcodeptr = ERR42; |
| goto FAILED; |
| } |
| if (namelen > MAX_NAME_SIZE) |
| { |
| *errorcodeptr = ERR48; |
| goto FAILED; |
| } |
| recno = 0; |
| } |
| |
| /* In the real compile, seek the name in the table */ |
| |
| else |
| { |
| slot = cd->name_table; |
| for (i = 0; i < cd->names_found; i++) |
| { |
| if (strncmp((char *)name, (char *)slot+2, namelen) == 0) break; |
| slot += cd->name_entry_size; |
| } |
| |
| if (i < cd->names_found) /* Back reference */ |
| { |
| recno = GET2(slot, 0); |
| } |
| else if ((recno = /* Forward back reference */ |
| find_parens(ptr, cd->bracount, name, namelen, |
| (options & PCRE_EXTENDED) != 0)) <= 0) |
| { |
| *errorcodeptr = ERR15; |
| goto FAILED; |
| } |
| } |
| |
| /* In both phases, we can now go to the code than handles numerical |
| recursion or backreferences. */ |
| |
| if (is_recurse) goto HANDLE_RECURSION; |
| else goto HANDLE_REFERENCE; |
| |
| |
| /* ------------------------------------------------------------ */ |
| case 'R': /* Recursion */ |
| ptr++; /* Same as (?0) */ |
| /* Fall through */ |
| |
| |
| /* ------------------------------------------------------------ */ |
| case '-': case '+': |
| case '0': case '1': case '2': case '3': case '4': /* Recursion or */ |
| case '5': case '6': case '7': case '8': case '9': /* subroutine */ |
| { |
| const uschar *called; |
| |
| if ((refsign = *ptr) == '+') ptr++; |
| else if (refsign == '-') |
| { |
| if (g_ascii_isdigit(ptr[1]) == 0) |
| goto OTHER_CHAR_AFTER_QUERY; |
| ptr++; |
| } |
| |
| recno = 0; |
| while(g_ascii_isdigit(*ptr) != 0) |
| recno = recno * 10 + *ptr++ - '0'; |
| |
| if (*ptr != ')') |
| { |
| *errorcodeptr = ERR29; |
| goto FAILED; |
| } |
| |
| if (refsign == '-') |
| { |
| if (recno == 0) |
| { |
| *errorcodeptr = ERR58; |
| goto FAILED; |
| } |
| recno = cd->bracount - recno + 1; |
| if (recno <= 0) |
| { |
| *errorcodeptr = ERR15; |
| goto FAILED; |
| } |
| } |
| else if (refsign == '+') |
| { |
| if (recno == 0) |
| { |
| *errorcodeptr = ERR58; |
| goto FAILED; |
| } |
| recno += cd->bracount; |
| } |
| |
| /* Come here from code above that handles a named recursion */ |
| |
| HANDLE_RECURSION: |
| |
| previous = code; |
| called = cd->start_code; |
| |
| /* When we are actually compiling, find the bracket that is being |
| referenced. Temporarily end the regex in case it doesn't exist before |
| this point. If we end up with a forward reference, first check that |
| the bracket does occur later so we can give the error (and position) |
| now. Then remember this forward reference in the workspace so it can |
| be filled in at the end. */ |
| |
| if (lengthptr == NULL) |
| { |
| *code = OP_END; |
| if (recno != 0) called = find_bracket(cd->start_code, utf8, recno); |
| |
| /* Forward reference */ |
| |
| if (called == NULL) |
| { |
| if (find_parens(ptr, cd->bracount, NULL, recno, |
| (options & PCRE_EXTENDED) != 0) < 0) |
| { |
| *errorcodeptr = ERR15; |
| goto FAILED; |
| } |
| called = cd->start_code + recno; |
| PUTINC(cd->hwm, 0, code + 2 + LINK_SIZE - cd->start_code); |
| } |
| |
| /* If not a forward reference, and the subpattern is still open, |
| this is a recursive call. We check to see if this is a left |
| recursion that could loop for ever, and diagnose that case. */ |
| |
| else if (GET(called, 1) == 0 && |
| could_be_empty(called, code, bcptr, utf8)) |
| { |
| *errorcodeptr = ERR40; |
| goto FAILED; |
| } |
| } |
| |
| /* Insert the recursion/subroutine item, automatically wrapped inside |
| "once" brackets. Set up a "previous group" length so that a |
| subsequent quantifier will work. */ |
| |
| *code = OP_ONCE; |
| PUT(code, 1, 2 + 2*LINK_SIZE); |
| code += 1 + LINK_SIZE; |
| |
| *code = OP_RECURSE; |
| PUT(code, 1, called - cd->start_code); |
| code += 1 + LINK_SIZE; |
| |
| *code = OP_KET; |
| PUT(code, 1, 2 + 2*LINK_SIZE); |
| code += 1 + LINK_SIZE; |
| |
| length_prevgroup = 3 + 3*LINK_SIZE; |
| } |
| |
| /* Can't determine a first byte now */ |
| |
| if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE; |
| continue; |
| |
| |
| /* ------------------------------------------------------------ */ |
| default: /* Other characters: check option setting */ |
| OTHER_CHAR_AFTER_QUERY: |
| set = unset = 0; |
| optset = &set; |
| |
| while (*ptr != ')' && *ptr != ':') |
| { |
| switch (*ptr++) |
| { |
| case '-': optset = &unset; break; |
| |
| case 'J': /* Record that it changed in the external options */ |
| *optset |= PCRE_DUPNAMES; |
| cd->external_flags |= PCRE_JCHANGED; |
| break; |
| |
| case 'i': *optset |= PCRE_CASELESS; break; |
| case 'm': *optset |= PCRE_MULTILINE; break; |
| case 's': *optset |= PCRE_DOTALL; break; |
| case 'x': *optset |= PCRE_EXTENDED; break; |
| case 'U': *optset |= PCRE_UNGREEDY; break; |
| case 'X': *optset |= PCRE_EXTRA; break; |
| |
| default: *errorcodeptr = ERR12; |
| ptr--; /* Correct the offset */ |
| goto FAILED; |
| } |
| } |
| |
| /* Set up the changed option bits, but don't change anything yet. */ |
| |
| newoptions = (options | set) & (~unset); |
| |
| /* If the options ended with ')' this is not the start of a nested |
| group with option changes, so the options change at this level. If this |
| item is right at the start of the pattern, the options can be |
| abstracted and made external in the pre-compile phase, and ignored in |
| the compile phase. This can be helpful when matching -- for instance in |
| caseless checking of required bytes. |
| |
| If the code pointer is not (cd->start_code + 1 + LINK_SIZE), we are |
| definitely *not* at the start of the pattern because something has been |
| compiled. In the pre-compile phase, however, the code pointer can have |
| that value after the start, because it gets reset as code is discarded |
| during the pre-compile. However, this can happen only at top level - if |
| we are within parentheses, the starting BRA will still be present. At |
| any parenthesis level, the length value can be used to test if anything |
| has been compiled at that level. Thus, a test for both these conditions |
| is necessary to ensure we correctly detect the start of the pattern in |
| both phases. |
| |
| If we are not at the pattern start, compile code to change the ims |
| options if this setting actually changes any of them. We also pass the |
| new setting back so that it can be put at the start of any following |
| branches, and when this group ends (if we are in a group), a resetting |
| item can be compiled. */ |
| |
| if (*ptr == ')') |
| { |
| if (code == cd->start_code + 1 + LINK_SIZE && |
| (lengthptr == NULL || *lengthptr == 2 + 2*LINK_SIZE)) |
| { |
| cd->external_options = newoptions; |
| options = newoptions; |
| } |
| else |
| { |
| if ((options & PCRE_IMS) != (newoptions & PCRE_IMS)) |
| { |
| *code++ = OP_OPT; |
| *code++ = newoptions & PCRE_IMS; |
| } |
| |
| /* Change options at this level, and pass them back for use |
| in subsequent branches. Reset the greedy defaults and the case |
| value for firstbyte and reqbyte. */ |
| |
| *optionsptr = options = newoptions; |
| greedy_default = ((newoptions & PCRE_UNGREEDY) != 0); |
| greedy_non_default = greedy_default ^ 1; |
| req_caseopt = ((options & PCRE_CASELESS) != 0)? REQ_CASELESS : 0; |
| } |
| |
| previous = NULL; /* This item can't be repeated */ |
| continue; /* It is complete */ |
| } |
| |
| /* If the options ended with ':' we are heading into a nested group |
| with possible change of options. Such groups are non-capturing and are |
| not assertions of any kind. All we need to do is skip over the ':'; |
| the newoptions value is handled below. */ |
| |
| bravalue = OP_BRA; |
| ptr++; |
| } /* End of switch for character following (? */ |
| } /* End of (? handling */ |
| |
| /* Opening parenthesis not followed by '?'. If PCRE_NO_AUTO_CAPTURE is set, |
| all unadorned brackets become non-capturing and behave like (?:...) |
| brackets. */ |
| |
| else if ((options & PCRE_NO_AUTO_CAPTURE) != 0) |
| { |
| bravalue = OP_BRA; |
| } |
| |
| /* Else we have a capturing group. */ |
| |
| else |
| { |
| NUMBERED_GROUP: |
| cd->bracount += 1; |
| PUT2(code, 1+LINK_SIZE, cd->bracount); |
| skipbytes = 2; |
| } |
| |
| /* Process nested bracketed regex. Assertions may not be repeated, but |
| other kinds can be. All their opcodes are >= OP_ONCE. We copy code into a |
| non-register variable in order to be able to pass its address because some |
| compilers complain otherwise. Pass in a new setting for the ims options if |
| they have changed. */ |
| |
| previous = (bravalue >= OP_ONCE)? code : NULL; |
| *code = bravalue; |
| tempcode = code; |
| tempreqvary = cd->req_varyopt; /* Save value before bracket */ |
| length_prevgroup = 0; /* Initialize for pre-compile phase */ |
| |
| if (!compile_regex( |
| newoptions, /* The complete new option state */ |
| options & PCRE_IMS, /* The previous ims option state */ |
| &tempcode, /* Where to put code (updated) */ |
| &ptr, /* Input pointer (updated) */ |
| errorcodeptr, /* Where to put an error message */ |
| (bravalue == OP_ASSERTBACK || |
| bravalue == OP_ASSERTBACK_NOT), /* TRUE if back assert */ |
| reset_bracount, /* True if (?| group */ |
| skipbytes, /* Skip over bracket number */ |
| &subfirstbyte, /* For possible first char */ |
| &subreqbyte, /* For possible last char */ |
| bcptr, /* Current branch chain */ |
| cd, /* Tables block */ |
| (lengthptr == NULL)? NULL : /* Actual compile phase */ |
| &length_prevgroup /* Pre-compile phase */ |
| )) |
| goto FAILED; |
| |
| /* At the end of compiling, code is still pointing to the start of the |
| group, while tempcode has been updated to point past the end of the group |
| and any option resetting that may follow it. The pattern pointer (ptr) |
| is on the bracket. */ |
| |
| /* If this is a conditional bracket, check that there are no more than |
| two branches in the group, or just one if it's a DEFINE group. We do this |
| in the real compile phase, not in the pre-pass, where the whole group may |
| not be available. */ |
| |
| if (bravalue == OP_COND && lengthptr == NULL) |
| { |
| uschar *tc = code; |
| int condcount = 0; |
| |
| do { |
| condcount++; |
| tc += GET(tc,1); |
| } |
| while (*tc != OP_KET); |
| |
| /* A DEFINE group is never obeyed inline (the "condition" is always |
| false). It must have only one branch. */ |
| |
| if (code[LINK_SIZE+1] == OP_DEF) |
| { |
| if (condcount > 1) |
| { |
| *errorcodeptr = ERR54; |
| goto FAILED; |
| } |
| bravalue = OP_DEF; /* Just a flag to suppress char handling below */ |
| } |
| |
| /* A "normal" conditional group. If there is just one branch, we must not |
| make use of its firstbyte or reqbyte, because this is equivalent to an |
| empty second branch. */ |
| |
| else |
| { |
| if (condcount > 2) |
| { |
| *errorcodeptr = ERR27; |
| goto FAILED; |
| } |
| if (condcount == 1) subfirstbyte = subreqbyte = REQ_NONE; |
| } |
| } |
| |
| /* Error if hit end of pattern */ |
| |
| if (*ptr != ')') |
| { |
| *errorcodeptr = ERR14; |
| goto FAILED; |
| } |
| |
| /* In the pre-compile phase, update the length by the length of the group, |
| less the brackets at either end. Then reduce the compiled code to just a |
| set of non-capturing brackets so that it doesn't use much memory if it is |
| duplicated by a quantifier.*/ |
| |
| if (lengthptr != NULL) |
| { |
| if (OFLOW_MAX - *lengthptr < length_prevgroup - 2 - 2*LINK_SIZE) |
| { |
| *errorcodeptr = ERR20; |
| goto FAILED; |
| } |
| *lengthptr += length_prevgroup - 2 - 2*LINK_SIZE; |
| *code++ = OP_BRA; |
| PUTINC(code, 0, 1 + LINK_SIZE); |
| *code++ = OP_KET; |
| PUTINC(code, 0, 1 + LINK_SIZE); |
| break; /* No need to waste time with special character handling */ |
| } |
| |
| /* Otherwise update the main code pointer to the end of the group. */ |
| |
| code = tempcode; |
| |
| /* For a DEFINE group, required and first character settings are not |
| relevant. */ |
| |
| if (bravalue == OP_DEF) break; |
| |
| /* Handle updating of the required and first characters for other types of |
| group. Update for normal brackets of all kinds, and conditions with two |
| branches (see code above). If the bracket is followed by a quantifier with |
| zero repeat, we have to back off. Hence the definition of zeroreqbyte and |
| zerofirstbyte outside the main loop so that they can be accessed for the |
| back off. */ |
| |
| zeroreqbyte = reqbyte; |
| zerofirstbyte = firstbyte; |
| groupsetfirstbyte = FALSE; |
| |
| if (bravalue >= OP_ONCE) |
| { |
| /* If we have not yet set a firstbyte in this branch, take it from the |
| subpattern, remembering that it was set here so that a repeat of more |
| than one can replicate it as reqbyte if necessary. If the subpattern has |
| no firstbyte, set "none" for the whole branch. In both cases, a zero |
| repeat forces firstbyte to "none". */ |
| |
| if (firstbyte == REQ_UNSET) |
| { |
| if (subfirstbyte >= 0) |
| { |
| firstbyte = subfirstbyte; |
| groupsetfirstbyte = TRUE; |
| } |
| else firstbyte = REQ_NONE; |
| zerofirstbyte = REQ_NONE; |
| } |
| |
| /* If firstbyte was previously set, convert the subpattern's firstbyte |
| into reqbyte if there wasn't one, using the vary flag that was in |
| existence beforehand. */ |
| |
| else if (subfirstbyte >= 0 && subreqbyte < 0) |
| subreqbyte = subfirstbyte | tempreqvary; |
| |
| /* If the subpattern set a required byte (or set a first byte that isn't |
| really the first byte - see above), set it. */ |
| |
| if (subreqbyte >= 0) reqbyte = subreqbyte; |
| } |
| |
| /* For a forward assertion, we take the reqbyte, if set. This can be |
| helpful if the pattern that follows the assertion doesn't set a different |
| char. For example, it's useful for /(?=abcde).+/. We can't set firstbyte |
| for an assertion, however because it leads to incorrect effect for patterns |
| such as /(?=a)a.+/ when the "real" "a" would then become a reqbyte instead |
| of a firstbyte. This is overcome by a scan at the end if there's no |
| firstbyte, looking for an asserted first char. */ |
| |
| else if (bravalue == OP_ASSERT && subreqbyte >= 0) reqbyte = subreqbyte; |
| break; /* End of processing '(' */ |
| |
| |
| /* ===================================================================*/ |
| /* Handle metasequences introduced by \. For ones like \d, the ESC_ values |
| are arranged to be the negation of the corresponding OP_values. For the |
| back references, the values are ESC_REF plus the reference number. Only |
| back references and those types that consume a character may be repeated. |
| We can test for values between ESC_b and ESC_Z for the latter; this may |
| have to change if any new ones are ever created. */ |
| |
| case '\\': |
| tempptr = ptr; |
| c = check_escape(&ptr, errorcodeptr, cd->bracount, options, FALSE); |
| if (*errorcodeptr != 0) goto FAILED; |
| |
| if (c < 0) |
| { |
| if (-c == ESC_Q) /* Handle start of quoted string */ |
| { |
| if (ptr[1] == '\\' && ptr[2] == 'E') ptr += 2; /* avoid empty string */ |
| else inescq = TRUE; |
| continue; |
| } |
| |
| if (-c == ESC_E) continue; /* Perl ignores an orphan \E */ |
| |
| /* For metasequences that actually match a character, we disable the |
| setting of a first character if it hasn't already been set. */ |
| |
| if (firstbyte == REQ_UNSET && -c > ESC_b && -c < ESC_Z) |
| firstbyte = REQ_NONE; |
| |
| /* Set values to reset to if this is followed by a zero repeat. */ |
| |
| zerofirstbyte = firstbyte; |
| zeroreqbyte = reqbyte; |
| |
| /* \k<name> or \k'name' is a back reference by name (Perl syntax). |
| We also support \k{name} (.NET syntax) */ |
| |
| if (-c == ESC_k && (ptr[1] == '<' || ptr[1] == '\'' || ptr[1] == '{')) |
| { |
| is_recurse = FALSE; |
| terminator = (*(++ptr) == '<')? '>' : (*ptr == '\'')? '\'' : '}'; |
| goto NAMED_REF_OR_RECURSE; |
| } |
| |
| /* Back references are handled specially; must disable firstbyte if |
| not set to cope with cases like (?=(\w+))\1: which would otherwise set |
| ':' later. */ |
| |
| if (-c >= ESC_REF) |
| { |
| recno = -c - ESC_REF; |
| |
| HANDLE_REFERENCE: /* Come here from named backref handling */ |
| if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE; |
| previous = code; |
| *code++ = OP_REF; |
| PUT2INC(code, 0, recno); |
| cd->backref_map |= (recno < 32)? (1 << recno) : 1; |
| if (recno > cd->top_backref) cd->top_backref = recno; |
| } |
| |
| /* So are Unicode property matches, if supported. */ |
| |
| #ifdef SUPPORT_UCP |
| else if (-c == ESC_P || -c == ESC_p) |
| { |
| BOOL negated; |
| int pdata; |
| int ptype = get_ucp(&ptr, &negated, &pdata, errorcodeptr); |
| if (ptype < 0) goto FAILED; |
| previous = code; |
| *code++ = ((-c == ESC_p) != negated)? OP_PROP : OP_NOTPROP; |
| *code++ = ptype; |
| *code++ = pdata; |
| } |
| #else |
| |
| /* If Unicode properties are not supported, \X, \P, and \p are not |
| allowed. */ |
| |
| else if (-c == ESC_X || -c == ESC_P || -c == ESC_p) |
| { |
| *errorcodeptr = ERR45; |
| goto FAILED; |
| } |
| #endif |
| |
| /* For the rest (including \X when Unicode properties are supported), we |
| can obtain the OP value by negating the escape value. */ |
| |
| else |
| { |
| previous = (-c > ESC_b && -c < ESC_Z)? code : NULL; |
| *code++ = -c; |
| } |
| continue; |
| } |
| |
| /* We have a data character whose value is in c. In UTF-8 mode it may have |
| a value > 127. We set its representation in the length/buffer, and then |
| handle it as a data character. */ |
| |
| #ifdef SUPPORT_UTF8 |
| if (utf8 && c > 127) |
| mclength = _pcre_ord2utf8(c, mcbuffer); |
| else |
| #endif |
| |
| { |
| mcbuffer[0] = c; |
| mclength = 1; |
| } |
| goto ONE_CHAR; |
| |
| |
| /* ===================================================================*/ |
| /* Handle a literal character. It is guaranteed not to be whitespace or # |
| when the extended flag is set. If we are in UTF-8 mode, it may be a |
| multi-byte literal character. */ |
| |
| default: |
| NORMAL_CHAR: |
| mclength = 1; |
| mcbuffer[0] = c; |
| |
| #ifdef SUPPORT_UTF8 |
| if (utf8 && c >= 0xc0) |
| { |
| while ((ptr[1] & 0xc0) == 0x80) |
| mcbuffer[mclength++] = *(++ptr); |
| } |
| #endif |
| |
| /* At this point we have the character's bytes in mcbuffer, and the length |
| in mclength. When not in UTF-8 mode, the length is always 1. */ |
| |
| ONE_CHAR: |
| previous = code; |
| *code++ = ((options & PCRE_CASELESS) != 0)? OP_CHARNC : OP_CHAR; |
| for (c = 0; c < mclength; c++) *code++ = mcbuffer[c]; |
| |
| /* Remember if \r or \n were seen */ |
| |
| if (mcbuffer[0] == '\r' || mcbuffer[0] == '\n') |
| cd->external_flags |= PCRE_HASCRORLF; |
| |
| /* Set the first and required bytes appropriately. If no previous first |
| byte, set it from this character, but revert to none on a zero repeat. |
| Otherwise, leave the firstbyte value alone, and don't change it on a zero |
| repeat. */ |
| |
| if (firstbyte == REQ_UNSET) |
| { |
| zerofirstbyte = REQ_NONE; |
| zeroreqbyte = reqbyte; |
| |
| /* If the character is more than one byte long, we can set firstbyte |
| only if it is not to be matched caselessly. */ |
| |
| if (mclength == 1 || req_caseopt == 0) |
| { |
| firstbyte = mcbuffer[0] | req_caseopt; |
| if (mclength != 1) reqbyte = code[-1] | cd->req_varyopt; |
| } |
| else firstbyte = reqbyte = REQ_NONE; |
| } |
| |
| /* firstbyte was previously set; we can set reqbyte only the length is |
| 1 or the matching is caseful. */ |
| |
| else |
| { |
| zerofirstbyte = firstbyte; |
| zeroreqbyte = reqbyte; |
| if (mclength == 1 || req_caseopt == 0) |
| reqbyte = code[-1] | req_caseopt | cd->req_varyopt; |
| } |
| |
| break; /* End of literal character handling */ |
| } |
| } /* end of big loop */ |
| |
| |
| /* Control never reaches here by falling through, only by a goto for all the |
| error states. Pass back the position in the pattern so that it can be displayed |
| to the user for diagnosing the error. */ |
| |
| FAILED: |
| *ptrptr = ptr; |
| return FALSE; |
| } |
| |
| |
| |
| |
| /************************************************* |
| * Compile sequence of alternatives * |
| *************************************************/ |
| |
| /* On entry, ptr is pointing past the bracket character, but on return it |
| points to the closing bracket, or vertical bar, or end of string. The code |
| variable is pointing at the byte into which the BRA operator has been stored. |
| If the ims options are changed at the start (for a (?ims: group) or during any |
| branch, we need to insert an OP_OPT item at the start of every following branch |
| to ensure they get set correctly at run time, and also pass the new options |
| into every subsequent branch compile. |
| |
| This function is used during the pre-compile phase when we are trying to find |
| out the amount of memory needed, as well as during the real compile phase. The |
| value of lengthptr distinguishes the two phases. |
| |
| Arguments: |
| options option bits, including any changes for this subpattern |
| oldims previous settings of ims option bits |
| codeptr -> the address of the current code pointer |
| ptrptr -> the address of the current pattern pointer |
| errorcodeptr -> pointer to error code variable |
| lookbehind TRUE if this is a lookbehind assertion |
| reset_bracount TRUE to reset the count for each branch |
| skipbytes skip this many bytes at start (for brackets and OP_COND) |
| firstbyteptr place to put the first required character, or a negative number |
| reqbyteptr place to put the last required character, or a negative number |
| bcptr pointer to the chain of currently open branches |
| cd points to the data block with tables pointers etc. |
| lengthptr NULL during the real compile phase |
| points to length accumulator during pre-compile phase |
| |
| Returns: TRUE on success |
| */ |
| |
| static BOOL |
| compile_regex(int options, int oldims, uschar **codeptr, const uschar **ptrptr, |
| int *errorcodeptr, BOOL lookbehind, BOOL reset_bracount, int skipbytes, |
| int *firstbyteptr, int *reqbyteptr, branch_chain *bcptr, compile_data *cd, |
| int *lengthptr) |
| { |
| const uschar *ptr = *ptrptr; |
| uschar *code = *codeptr; |
| uschar *last_branch = code; |
| uschar *start_bracket = code; |
| uschar *reverse_count = NULL; |
| int firstbyte, reqbyte; |
| int branchfirstbyte, branchreqbyte; |
| int length; |
| int orig_bracount; |
| int max_bracount; |
| branch_chain bc; |
| |
| bc.outer = bcptr; |
| bc.current = code; |
| |
| firstbyte = reqbyte = REQ_UNSET; |
| |
| /* Accumulate the length for use in the pre-compile phase. Start with the |
| length of the BRA and KET and any extra bytes that are required at the |
| beginning. We accumulate in a local variable to save frequent testing of |
| lenthptr for NULL. We cannot do this by looking at the value of code at the |
| start and end of each alternative, because compiled items are discarded during |
| the pre-compile phase so that the work space is not exceeded. */ |
| |
| length = 2 + 2*LINK_SIZE + skipbytes; |
| |
| /* WARNING: If the above line is changed for any reason, you must also change |
| the code that abstracts option settings at the start of the pattern and makes |
| them global. It tests the value of length for (2 + 2*LINK_SIZE) in the |
| pre-compile phase to find out whether anything has yet been compiled or not. */ |
| |
| /* Offset is set zero to mark that this bracket is still open */ |
| |
| PUT(code, 1, 0); |
| code += 1 + LINK_SIZE + skipbytes; |
| |
| /* Loop for each alternative branch */ |
| |
| orig_bracount = max_bracount = cd->bracount; |
| for (;;) |
| { |
| /* For a (?| group, reset the capturing bracket count so that each branch |
| uses the same numbers. */ |
| |
| if (reset_bracount) cd->bracount = orig_bracount; |
| |
| /* Handle a change of ims options at the start of the branch */ |
| |
| if ((options & PCRE_IMS) != oldims) |
| { |
| *code++ = OP_OPT; |
| *code++ = options & PCRE_IMS; |
| length += 2; |
| } |
| |
| /* Set up dummy OP_REVERSE if lookbehind assertion */ |
| |
| if (lookbehind) |
| { |
| *code++ = OP_REVERSE; |
| reverse_count = code; |
| PUTINC(code, 0, 0); |
| length += 1 + LINK_SIZE; |
| } |
| |
| /* Now compile the branch; in the pre-compile phase its length gets added |
| into the length. */ |
| |
| if (!compile_branch(&options, &code, &ptr, errorcodeptr, &branchfirstbyte, |
| &branchreqbyte, &bc, cd, (lengthptr == NULL)? NULL : &length)) |
| { |
| *ptrptr = ptr; |
| return FALSE; |
| } |
| |
| /* Keep the highest bracket count in case (?| was used and some branch |
| has fewer than the rest. */ |
| |
| if (cd->bracount > max_bracount) max_bracount = cd->bracount; |
| |
| /* In the real compile phase, there is some post-processing to be done. */ |
| |
| if (lengthptr == NULL) |
| { |
| /* If this is the first branch, the firstbyte and reqbyte values for the |
| branch become the values for the regex. */ |
| |
| if (*last_branch != OP_ALT) |
| { |
| firstbyte = branchfirstbyte; |
| reqbyte = branchreqbyte; |
| } |
| |
| /* If this is not the first branch, the first char and reqbyte have to |
| match the values from all the previous branches, except that if the |
| previous value for reqbyte didn't have REQ_VARY set, it can still match, |
| and we set REQ_VARY for the regex. */ |
| |
| else |
| { |
| /* If we previously had a firstbyte, but it doesn't match the new branch, |
| we have to abandon the firstbyte for the regex, but if there was |
| previously no reqbyte, it takes on the value of the old firstbyte. */ |
| |
| if (firstbyte >= 0 && firstbyte != branchfirstbyte) |
| { |
| if (reqbyte < 0) reqbyte = firstbyte; |
| firstbyte = REQ_NONE; |
| } |
| |
| /* If we (now or from before) have no firstbyte, a firstbyte from the |
| branch becomes a reqbyte if there isn't a branch reqbyte. */ |
| |
| if (firstbyte < 0 && branchfirstbyte >= 0 && branchreqbyte < 0) |
| branchreqbyte = branchfirstbyte; |
| |
| /* Now ensure that the reqbytes match */ |
| |
| if ((reqbyte & ~REQ_VARY) != (branchreqbyte & ~REQ_VARY)) |
| reqbyte = REQ_NONE; |
| else reqbyte |= branchreqbyte; /* To "or" REQ_VARY */ |
| } |
| |
| /* If lookbehind, check that this branch matches a fixed-length string, and |
| put the length into the OP_REVERSE item. Temporarily mark the end of the |
| branch with OP_END. */ |
| |
| if (lookbehind) |
| { |
| int fixed_length; |
| *code = OP_END; |
| fixed_length = find_fixedlength(last_branch, options); |
| DPRINTF(("fixed length = %d\n", fixed_length)); |
| if (fixed_length < 0) |
| { |
| *errorcodeptr = (fixed_length == -2)? ERR36 : ERR25; |
| *ptrptr = ptr; |
| return FALSE; |
| } |
| PUT(reverse_count, 0, fixed_length); |
| } |
| } |
| |
| /* Reached end of expression, either ')' or end of pattern. In the real |
| compile phase, go back through the alternative branches and reverse the chain |
| of offsets, with the field in the BRA item now becoming an offset to the |
| first alternative. If there are no alternatives, it points to the end of the |
| group. The length in the terminating ket is always the length of the whole |
| bracketed item. If any of the ims options were changed inside the group, |
| compile a resetting op-code following, except at the very end of the pattern. |
| Return leaving the pointer at the terminating char. */ |
| |
| if (*ptr != '|') |
| { |
| if (lengthptr == NULL) |
| { |
| int branch_length = code - last_branch; |
| do |
| { |
| int prev_length = GET(last_branch, 1); |
| PUT(last_branch, 1, branch_length); |
| branch_length = prev_length; |
| last_branch -= branch_length; |
| } |
| while (branch_length > 0); |
| } |
| |
| /* Fill in the ket */ |
| |
| *code = OP_KET; |
| PUT(code, 1, code - start_bracket); |
| code += 1 + LINK_SIZE; |
| |
| /* Resetting option if needed */ |
| |
| if ((options & PCRE_IMS) != oldims && *ptr == ')') |
| { |
| *code++ = OP_OPT; |
| *code++ = oldims; |
| length += 2; |
| } |
| |
| /* Retain the highest bracket number, in case resetting was used. */ |
| |
| cd->bracount = max_bracount; |
| |
| /* Set values to pass back */ |
| |
| *codeptr = code; |
| *ptrptr = ptr; |
| *firstbyteptr = firstbyte; |
| *reqbyteptr = reqbyte; |
| if (lengthptr != NULL) |
| { |
| if (OFLOW_MAX - *lengthptr < length) |
| { |
| *errorcodeptr = ERR20; |
| return FALSE; |
| } |
| *lengthptr += length; |
| } |
| return TRUE; |
| } |
| |
| /* Another branch follows. In the pre-compile phase, we can move the code |
| pointer back to where it was for the start of the first branch. (That is, |
| pretend that each branch is the only one.) |
| |
| In the real compile phase, insert an ALT node. Its length field points back |
| to the previous branch while the bracket remains open. At the end the chain |
| is reversed. It's done like this so that the start of the bracket has a |
| zero offset until it is closed, making it possible to detect recursion. */ |
| |
| if (lengthptr != NULL) |
| { |
| code = *codeptr + 1 + LINK_SIZE + skipbytes; |
| length += 1 + LINK_SIZE; |
| } |
| else |
| { |
| *code = OP_ALT; |
| PUT(code, 1, code - last_branch); |
| bc.current = last_branch = code; |
| code += 1 + LINK_SIZE; |
| } |
| |
| ptr++; |
| } |
| /* Control never reaches here */ |
| } |
| |
| |
| |
| |
| /************************************************* |
| * Check for anchored expression * |
| *************************************************/ |
| |
| /* Try to find out if this is an anchored regular expression. Consider each |
| alternative branch. If they all start with OP_SOD or OP_CIRC, or with a bracket |
| all of whose alternatives start with OP_SOD or OP_CIRC (recurse ad lib), then |
| it's anchored. However, if this is a multiline pattern, then only OP_SOD |
| counts, since OP_CIRC can match in the middle. |
| |
| We can also consider a regex to be anchored if OP_SOM starts all its branches. |
| This is the code for \G, which means "match at start of match position, taking |
| into account the match offset". |
| |
| A branch is also implicitly anchored if it starts with .* and DOTALL is set, |
| because that will try the rest of the pattern at all possible matching points, |
| so there is no point trying again.... er .... |
| |
| .... except when the .* appears inside capturing parentheses, and there is a |
| subsequent back reference to those parentheses. We haven't enough information |
| to catch that case precisely. |
| |
| At first, the best we could do was to detect when .* was in capturing brackets |
| and the highest back reference was greater than or equal to that level. |
| However, by keeping a bitmap of the first 31 back references, we can catch some |
| of the more common cases more precisely. |
| |
| Arguments: |
| code points to start of expression (the bracket) |
| options points to the options setting |
| bracket_map a bitmap of which brackets we are inside while testing; this |
| handles up to substring 31; after that we just have to take |
| the less precise approach |
| backref_map the back reference bitmap |
| |
| Returns: TRUE or FALSE |
| */ |
| |
| static BOOL |
| is_anchored(register const uschar *code, int *options, unsigned int bracket_map, |
| unsigned int backref_map) |
| { |
| do { |
| const uschar *scode = first_significant_code(code + _pcre_OP_lengths[*code], |
| options, PCRE_MULTILINE, FALSE); |
| register int op = *scode; |
| |
| /* Non-capturing brackets */ |
| |
| if (op == OP_BRA) |
| { |
| if (!is_anchored(scode, options, bracket_map, backref_map)) return FALSE; |
| } |
| |
| /* Capturing brackets */ |
| |
| else if (op == OP_CBRA) |
| { |
| int n = GET2(scode, 1+LINK_SIZE); |
| int new_map = bracket_map | ((n < 32)? (1 << n) : 1); |
| if (!is_anchored(scode, options, new_map, backref_map)) return FALSE; |
| } |
| |
| /* Other brackets */ |
| |
| else if (op == OP_ASSERT || op == OP_ONCE || op == OP_COND) |
| { |
| if (!is_anchored(scode, options, bracket_map, backref_map)) return FALSE; |
| } |
| |
| /* .* is not anchored unless DOTALL is set and it isn't in brackets that |
| are or may be referenced. */ |
| |
| else if ((op == OP_TYPESTAR || op == OP_TYPEMINSTAR || |
| op == OP_TYPEPOSSTAR) && |
| (*options & PCRE_DOTALL) != 0) |
| { |
| if (scode[1] != OP_ANY || (bracket_map & backref_map) != 0) return FALSE; |
| } |
| |
| /* Check for explicit anchoring */ |
| |
| else if (op != OP_SOD && op != OP_SOM && |
| ((*options & PCRE_MULTILINE) != 0 || op != OP_CIRC)) |
| return FALSE; |
| code += GET(code, 1); |
| } |
| while (*code == OP_ALT); /* Loop for each alternative */ |
| return TRUE; |
| } |
| |
| |
| |
| /************************************************* |
| * Check for starting with ^ or .* * |
| *************************************************/ |
| |
| /* This is called to find out if every branch starts with ^ or .* so that |
| "first char" processing can be done to speed things up in multiline |
| matching and for non-DOTALL patterns that start with .* (which must start at |
| the beginning or after \n). As in the case of is_anchored() (see above), we |
| have to take account of back references to capturing brackets that contain .* |
| because in that case we can't make the assumption. |
| |
| Arguments: |
| code points to start of expression (the bracket) |
| bracket_map a bitmap of which brackets we are inside while testing; this |
| handles up to substring 31; after that we just have to take |
| the less precise approach |
| backref_map the back reference bitmap |
| |
| Returns: TRUE or FALSE |
| */ |
| |
| static BOOL |
| is_startline(const uschar *code, unsigned int bracket_map, |
| unsigned int backref_map) |
| { |
| do { |
| const uschar *scode = first_significant_code(code + _pcre_OP_lengths[*code], |
| NULL, 0, FALSE); |
| register int op = *scode; |
| |
| /* Non-capturing brackets */ |
| |
| if (op == OP_BRA) |
| { |
| if (!is_startline(scode, bracket_map, backref_map)) return FALSE; |
| } |
| |
| /* Capturing brackets */ |
| |
| else if (op == OP_CBRA) |
| { |
| int n = GET2(scode, 1+LINK_SIZE); |
| int new_map = bracket_map | ((n < 32)? (1 << n) : 1); |
| if (!is_startline(scode, new_map, backref_map)) return FALSE; |
| } |
| |
| /* Other brackets */ |
| |
| else if (op == OP_ASSERT || op == OP_ONCE || op == OP_COND) |
| { if (!is_startline(scode, bracket_map, backref_map)) return FALSE; } |
| |
| /* .* means "start at start or after \n" if it isn't in brackets that |
| may be referenced. */ |
| |
| else if (op == OP_TYPESTAR || op == OP_TYPEMINSTAR || op == OP_TYPEPOSSTAR) |
| { |
| if (scode[1] != OP_ANY || (bracket_map & backref_map) != 0) return FALSE; |
| } |
| |
| /* Check for explicit circumflex */ |
| |
| else if (op != OP_CIRC) return FALSE; |
| |
| /* Move on to the next alternative */ |
| |
| code += GET(code, 1); |
| } |
| while (*code == OP_ALT); /* Loop for each alternative */ |
| return TRUE; |
| } |
| |
| |
| |
| /************************************************* |
| * Check for asserted fixed first char * |
| *************************************************/ |
| |
| /* During compilation, the "first char" settings from forward assertions are |
| discarded, because they can cause conflicts with actual literals that follow. |
| However, if we end up without a first char setting for an unanchored pattern, |
| it is worth scanning the regex to see if there is an initial asserted first |
| char. If all branches start with the same asserted char, or with a bracket all |
| of whose alternatives start with the same asserted char (recurse ad lib), then |
| we return that char, otherwise -1. |
| |
| Arguments: |
| code points to start of expression (the bracket) |
| options pointer to the options (used to check casing changes) |
| inassert TRUE if in an assertion |
| |
| Returns: -1 or the fixed first char |
| */ |
| |
| static int |
| find_firstassertedchar(const uschar *code, int *options, BOOL inassert) |
| { |
| register int c = -1; |
| do { |
| int d; |
| const uschar *scode = |
| first_significant_code(code + 1+LINK_SIZE, options, PCRE_CASELESS, TRUE); |
| register int op = *scode; |
| |
| switch(op) |
| { |
| default: |
| return -1; |
| |
| case OP_BRA: |
| case OP_CBRA: |
| case OP_ASSERT: |
| case OP_ONCE: |
| case OP_COND: |
| if ((d = find_firstassertedchar(scode, options, op == OP_ASSERT)) < 0) |
| return -1; |
| if (c < 0) c = d; else if (c != d) return -1; |
| break; |
| |
| case OP_EXACT: /* Fall through */ |
| scode += 2; |
| |
| case OP_CHAR: |
| case OP_CHARNC: |
| case OP_PLUS: |
| case OP_MINPLUS: |
| case OP_POSPLUS: |
| if (!inassert) return -1; |
| if (c < 0) |
| { |
| c = scode[1]; |
| if ((*options & PCRE_CASELESS) != 0) c |= REQ_CASELESS; |
| } |
| else if (c != scode[1]) return -1; |
| break; |
| } |
| |
| code += GET(code, 1); |
| } |
| while (*code == OP_ALT); |
| return c; |
| } |
| |
| |
| |
| /************************************************* |
| * Compile a Regular Expression * |
| *************************************************/ |
| |
| /* This function takes a string and returns a pointer to a block of store |
| holding a compiled version of the expression. The original API for this |
| function had no error code return variable; it is retained for backwards |
| compatibility. The new function is given a new name. |
| |
| Arguments: |
| pattern the regular expression |
| options various option bits |
| errorcodeptr pointer to error code variable (pcre_compile2() only) |
| can be NULL if you don't want a code value |
| errorptr pointer to pointer to error text |
| erroroffset ptr offset in pattern where error was detected |
| tables pointer to character tables or NULL |
| |
| Returns: pointer to compiled data block, or NULL on error, |
| with errorptr and erroroffset set |
| */ |
| |
| PCRE_EXP_DEFN pcre * |
| pcre_compile(const char *pattern, int options, const char **errorptr, |
| int *erroroffset, const unsigned char *tables) |
| { |
| return pcre_compile2(pattern, options, NULL, errorptr, erroroffset, tables); |
| } |
| |
| |
| PCRE_EXP_DEFN pcre * |
| pcre_compile2(const char *pattern, int options, int *errorcodeptr, |
| const char **errorptr, int *erroroffset, const unsigned char *tables) |
| { |
| real_pcre *re; |
| int length = 1; /* For final END opcode */ |
| int firstbyte, reqbyte, newline; |
| int errorcode = 0; |
| int skipatstart = 0; |
| #ifdef SUPPORT_UTF8 |
| BOOL utf8; |
| #endif |
| size_t size; |
| uschar *code; |
| const uschar *codestart; |
| const uschar *ptr; |
| compile_data compile_block; |
| compile_data *cd = &compile_block; |
| |
| /* This space is used for "compiling" into during the first phase, when we are |
| computing the amount of memory that is needed. Compiled items are thrown away |
| as soon as possible, so that a fairly large buffer should be sufficient for |
| this purpose. The same space is used in the second phase for remembering where |
| to fill in forward references to subpatterns. */ |
| |
| uschar cworkspace[COMPILE_WORK_SIZE]; |
| |
| |
| /* Set this early so that early errors get offset 0. */ |
| |
| ptr = (const uschar *)pattern; |
| |
| /* We can't pass back an error message if errorptr is NULL; I guess the best we |
| can do is just return NULL, but we can set a code value if there is a code |
| pointer. */ |
| |
| if (errorptr == NULL) |
| { |
| if (errorcodeptr != NULL) *errorcodeptr = 99; |
| return NULL; |
| } |
| |
| *errorptr = NULL; |
| if (errorcodeptr != NULL) *errorcodeptr = ERR0; |
| |
| /* However, we can give a message for this error */ |
| |
| if (erroroffset == NULL) |
| { |
| errorcode = ERR16; |
| goto PCRE_EARLY_ERROR_RETURN2; |
| } |
| |
| *erroroffset = 0; |
| |
| /* Can't support UTF8 unless PCRE has been compiled to include the code. */ |
| |
| #ifdef SUPPORT_UTF8 |
| utf8 = (options & PCRE_UTF8) != 0; |
| if (utf8 && (options & PCRE_NO_UTF8_CHECK) == 0 && |
| (*erroroffset = _pcre_valid_utf8((uschar *)pattern, -1)) >= 0) |
| { |
| errorcode = ERR44; |
| goto PCRE_EARLY_ERROR_RETURN2; |
| } |
| #else |
| if ((options & PCRE_UTF8) != 0) |
| { |
| errorcode = ERR32; |
| goto PCRE_EARLY_ERROR_RETURN; |
| } |
| #endif |
| |
| if ((options & ~PUBLIC_OPTIONS) != 0) |
| { |
| errorcode = ERR17; |
| goto PCRE_EARLY_ERROR_RETURN; |
| } |
| |
| /* Set up pointers to the individual character tables */ |
| |
| if (tables == NULL) tables = _pcre_default_tables; |
| cd->lcc = tables + lcc_offset; |
| cd->fcc = tables + fcc_offset; |
| cd->cbits = tables + cbits_offset; |
| cd->ctypes = tables + ctypes_offset; |
| |
| /* Check for global one-time settings at the start of the pattern, and remember |
| the offset for later. */ |
| |
| while (ptr[skipatstart] == '(' && ptr[skipatstart+1] == '*') |
| { |
| int newnl = 0; |
| int newbsr = 0; |
| |
| if (strncmp((char *)(ptr+skipatstart+2), "CR)", 3) == 0) |
| { skipatstart += 5; newnl = PCRE_NEWLINE_CR; } |
| else if (strncmp((char *)(ptr+skipatstart+2), "LF)", 3) == 0) |
| { skipatstart += 5; newnl = PCRE_NEWLINE_LF; } |
| else if (strncmp((char *)(ptr+skipatstart+2), "CRLF)", 5) == 0) |
| { skipatstart += 7; newnl = PCRE_NEWLINE_CR + PCRE_NEWLINE_LF; } |
| else if (strncmp((char *)(ptr+skipatstart+2), "ANY)", 4) == 0) |
| { skipatstart += 6; newnl = PCRE_NEWLINE_ANY; } |
| else if (strncmp((char *)(ptr+skipatstart+2), "ANYCRLF)", 8) == 0) |
| { skipatstart += 10; newnl = PCRE_NEWLINE_ANYCRLF; } |
| |
| else if (strncmp((char *)(ptr+skipatstart+2), "BSR_ANYCRLF)", 12) == 0) |
| { skipatstart += 14; newbsr = PCRE_BSR_ANYCRLF; } |
| else if (strncmp((char *)(ptr+skipatstart+2), "BSR_UNICODE)", 12) == 0) |
| { skipatstart += 14; newbsr = PCRE_BSR_UNICODE; } |
| |
| if (newnl != 0) |
| options = (options & ~PCRE_NEWLINE_BITS) | newnl; |
| else if (newbsr != 0) |
| options = (options & ~(PCRE_BSR_ANYCRLF|PCRE_BSR_UNICODE)) | newbsr; |
| else break; |
| } |
| |
| /* Check validity of \R options. */ |
| |
| switch (options & (PCRE_BSR_ANYCRLF|PCRE_BSR_UNICODE)) |
| { |
| case 0: |
| case PCRE_BSR_ANYCRLF: |
| case PCRE_BSR_UNICODE: |
| break; |
| default: errorcode = ERR56; goto PCRE_EARLY_ERROR_RETURN; |
| } |
| |
| /* Handle different types of newline. The three bits give seven cases. The |
| current code allows for fixed one- or two-byte sequences, plus "any" and |
| "anycrlf". */ |
| |
| switch (options & PCRE_NEWLINE_BITS) |
| { |
| case 0: newline = NEWLINE; break; /* Build-time default */ |
| case PCRE_NEWLINE_CR: newline = '\r'; break; |
| case PCRE_NEWLINE_LF: newline = '\n'; break; |
| case PCRE_NEWLINE_CR+ |
| PCRE_NEWLINE_LF: newline = ('\r' << 8) | '\n'; break; |
| case PCRE_NEWLINE_ANY: newline = -1; break; |
| case PCRE_NEWLINE_ANYCRLF: newline = -2; break; |
| default: errorcode = ERR56; goto PCRE_EARLY_ERROR_RETURN; |
| } |
| |
| if (newline == -2) |
| { |
| cd->nltype = NLTYPE_ANYCRLF; |
| } |
| else if (newline < 0) |
| { |
| cd->nltype = NLTYPE_ANY; |
| } |
| else |
| { |
| cd->nltype = NLTYPE_FIXED; |
| if (newline > 255) |
| { |
| cd->nllen = 2; |
| cd->nl[0] = (newline >> 8) & 255; |
| cd->nl[1] = newline & 255; |
| } |
| else |
| { |
| cd->nllen = 1; |
| cd->nl[0] = newline; |
| } |
| } |
| |
| /* Maximum back reference and backref bitmap. The bitmap records up to 31 back |
| references to help in deciding whether (.*) can be treated as anchored or not. |
| */ |
| |
| cd->top_backref = 0; |
| cd->backref_map = 0; |
| |
| /* Reflect pattern for debugging output */ |
| |
| DPRINTF(("------------------------------------------------------------------\n")); |
| DPRINTF(("%s\n", pattern)); |
| |
| /* Pretend to compile the pattern while actually just accumulating the length |
| of memory required. This behaviour is triggered by passing a non-NULL final |
| argument to compile_regex(). We pass a block of workspace (cworkspace) for it |
| to compile parts of the pattern into; the compiled code is discarded when it is |
| no longer needed, so hopefully this workspace will never overflow, though there |
| is a test for its doing so. */ |
| |
| cd->bracount = 0; |
| cd->names_found = 0; |
| cd->name_entry_size = 0; |
| cd->name_table = NULL; |
| cd->start_workspace = cworkspace; |
| cd->start_code = cworkspace; |
| cd->hwm = cworkspace; |
| cd->start_pattern = (const uschar *)pattern; |
| cd->end_pattern = (const uschar *)(pattern + strlen(pattern)); |
| cd->req_varyopt = 0; |
| cd->external_options = options; |
| cd->external_flags = 0; |
| |
| /* Now do the pre-compile. On error, errorcode will be set non-zero, so we |
| don't need to look at the result of the function here. The initial options have |
| been put into the cd block so that they can be changed if an option setting is |
| found within the regex right at the beginning. Bringing initial option settings |
| outside can help speed up starting point checks. */ |
| |
| ptr += skipatstart; |
| code = cworkspace; |
| *code = OP_BRA; |
| (void)compile_regex(cd->external_options, cd->external_options & PCRE_IMS, |
| &code, &ptr, &errorcode, FALSE, FALSE, 0, &firstbyte, &reqbyte, NULL, cd, |
| &length); |
| if (errorcode != 0) goto PCRE_EARLY_ERROR_RETURN; |
| |
| DPRINTF(("end pre-compile: length=%d workspace=%d\n", length, |
| cd->hwm - cworkspace)); |
| |
| if (length > MAX_PATTERN_SIZE) |
| { |
| errorcode = ERR20; |
| goto PCRE_EARLY_ERROR_RETURN; |
| } |
| |
| /* Compute the size of data block needed and get it, either from malloc or |
| externally provided function. Integer overflow should no longer be possible |
| because nowadays we limit the maximum value of cd->names_found and |
| cd->name_entry_size. */ |
| |
| size = length + sizeof(real_pcre) + cd->names_found * (cd->name_entry_size + 3); |
| re = (real_pcre *)(pcre_malloc)(size); |
| |
| if (re == NULL) |
| { |
| errorcode = ERR21; |
| goto PCRE_EARLY_ERROR_RETURN; |
| } |
| |
| /* Put in the magic number, and save the sizes, initial options, internal |
| flags, and character table pointer. NULL is used for the default character |
| tables. The nullpad field is at the end; it's there to help in the case when a |
| regex compiled on a system with 4-byte pointers is run on another with 8-byte |
| pointers. */ |
| |
| re->magic_number = MAGIC_NUMBER; |
| re->size = size; |
| re->options = cd->external_options; |
| re->flags = cd->external_flags; |
| re->dummy1 = 0; |
| re->first_byte = 0; |
| re->req_byte = 0; |
| re->name_table_offset = sizeof(real_pcre); |
| re->name_entry_size = cd->name_entry_size; |
| re->name_count = cd->names_found; |
| re->ref_count = 0; |
| re->tables = (tables == _pcre_default_tables)? NULL : tables; |
| re->nullpad = NULL; |
| |
| /* The starting points of the name/number translation table and of the code are |
| passed around in the compile data block. The start/end pattern and initial |
| options are already set from the pre-compile phase, as is the name_entry_size |
| field. Reset the bracket count and the names_found field. Also reset the hwm |
| field; this time it's used for remembering forward references to subpatterns. |
| */ |
| |
| cd->bracount = 0; |
| cd->names_found = 0; |
| cd->name_table = (uschar *)re + re->name_table_offset; |
| codestart = cd->name_table + re->name_entry_size * re->name_count; |
| cd->start_code = codestart; |
| cd->hwm = cworkspace; |
| cd->req_varyopt = 0; |
| cd->had_accept = FALSE; |
| |
| /* Set up a starting, non-extracting bracket, then compile the expression. On |
| error, errorcode will be set non-zero, so we don't need to look at the result |
| of the function here. */ |
| |
| ptr = (const uschar *)pattern + skipatstart; |
| code = (uschar *)codestart; |
| *code = OP_BRA; |
| (void)compile_regex(re->options, re->options & PCRE_IMS, &code, &ptr, |
| &errorcode, FALSE, FALSE, 0, &firstbyte, &reqbyte, NULL, cd, NULL); |
| re->top_bracket = cd->bracount; |
| re->top_backref = cd->top_backref; |
| re->flags = cd->external_flags; |
| |
| if (cd->had_accept) reqbyte = -1; /* Must disable after (*ACCEPT) */ |
| |
| /* If not reached end of pattern on success, there's an excess bracket. */ |
| |
| if (errorcode == 0 && *ptr != 0) errorcode = ERR22; |
| |
| /* Fill in the terminating state and check for disastrous overflow, but |
| if debugging, leave the test till after things are printed out. */ |
| |
| *code++ = OP_END; |
| |
| #ifndef DEBUG |
| if (code - codestart > length) errorcode = ERR23; |
| #endif |
| |
| /* Fill in any forward references that are required. */ |
| |
| while (errorcode == 0 && cd->hwm > cworkspace) |
| { |
| int offset, recno; |
| const uschar *groupptr; |
| cd->hwm -= LINK_SIZE; |
| offset = GET(cd->hwm, 0); |
| recno = GET(codestart, offset); |
| groupptr = find_bracket(codestart, (re->options & PCRE_UTF8) != 0, recno); |
| if (groupptr == NULL) errorcode = ERR53; |
| else PUT(((uschar *)codestart), offset, groupptr - codestart); |
| } |
| |
| /* Give an error if there's back reference to a non-existent capturing |
| subpattern. */ |
| |
| if (errorcode == 0 && re->top_backref > re->top_bracket) errorcode = ERR15; |
| |
| /* Failed to compile, or error while post-processing */ |
| |
| if (errorcode != 0) |
| { |
| (pcre_free)(re); |
| PCRE_EARLY_ERROR_RETURN: |
| *erroroffset = ptr - (const uschar *)pattern; |
| PCRE_EARLY_ERROR_RETURN2: |
| *errorptr = find_error_text(errorcode); |
| if (errorcodeptr != NULL) *errorcodeptr = errorcode; |
| return NULL; |
| } |
| |
| /* If the anchored option was not passed, set the flag if we can determine that |
| the pattern is anchored by virtue of ^ characters or \A or anything else (such |
| as starting with .* when DOTALL is set). |
| |
| Otherwise, if we know what the first byte has to be, save it, because that |
| speeds up unanchored matches no end. If not, see if we can set the |
| PCRE_STARTLINE flag. This is helpful for multiline matches when all branches |
| start with ^. and also when all branches start with .* for non-DOTALL matches. |
| */ |
| |
| if ((re->options & PCRE_ANCHORED) == 0) |
| { |
| int temp_options = re->options; /* May get changed during these scans */ |
| if (is_anchored(codestart, &temp_options, 0, cd->backref_map)) |
| re->options |= PCRE_ANCHORED; |
| else |
| { |
| if (firstbyte < 0) |
| firstbyte = find_firstassertedchar(codestart, &temp_options, FALSE); |
| if (firstbyte >= 0) /* Remove caseless flag for non-caseable chars */ |
| { |
| int ch = firstbyte & 255; |
| re->first_byte = ((firstbyte & REQ_CASELESS) != 0 && |
| cd->fcc[ch] == ch)? ch : firstbyte; |
| re->flags |= PCRE_FIRSTSET; |
| } |
| else if (is_startline(codestart, 0, cd->backref_map)) |
| re->flags |= PCRE_STARTLINE; |
| } |
| } |
| |
| /* For an anchored pattern, we use the "required byte" only if it follows a |
| variable length item in the regex. Remove the caseless flag for non-caseable |
| bytes. */ |
| |
| if (reqbyte >= 0 && |
| ((re->options & PCRE_ANCHORED) == 0 || (reqbyte & REQ_VARY) != 0)) |
| { |
| int ch = reqbyte & 255; |
| re->req_byte = ((reqbyte & REQ_CASELESS) != 0 && |
| cd->fcc[ch] == ch)? (reqbyte & ~REQ_CASELESS) : reqbyte; |
| re->flags |= PCRE_REQCHSET; |
| } |
| |
| /* Print out the compiled data if debugging is enabled. This is never the |
| case when building a production library. */ |
| |
| #ifdef DEBUG |
| |
| printf("Length = %d top_bracket = %d top_backref = %d\n", |
| length, re->top_bracket, re->top_backref); |
| |
| printf("Options=%08x\n", re->options); |
| |
| if ((re->flags & PCRE_FIRSTSET) != 0) |
| { |
| int ch = re->first_byte & 255; |
| const char *caseless = ((re->first_byte & REQ_CASELESS) == 0)? |
| "" : " (caseless)"; |
| if (isprint(ch)) printf("First char = %c%s\n", ch, caseless); |
| else printf("First char = \\x%02x%s\n", ch, caseless); |
| } |
| |
| if ((re->flags & PCRE_REQCHSET) != 0) |
| { |
| int ch = re->req_byte & 255; |
| const char *caseless = ((re->req_byte & REQ_CASELESS) == 0)? |
| "" : " (caseless)"; |
| if (isprint(ch)) printf("Req char = %c%s\n", ch, caseless); |
| else printf("Req char = \\x%02x%s\n", ch, caseless); |
| } |
| |
| pcre_printint(re, stdout, TRUE); |
| |
| /* This check is done here in the debugging case so that the code that |
| was compiled can be seen. */ |
| |
| if (code - codestart > length) |
| { |
| (pcre_free)(re); |
| *errorptr = find_error_text(ERR23); |
| *erroroffset = ptr - (uschar *)pattern; |
| if (errorcodeptr != NULL) *errorcodeptr = ERR23; |
| return NULL; |
| } |
| #endif /* DEBUG */ |
| |
| return (pcre *)re; |
| } |
| |
| /* End of pcre_compile.c */ |