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/*************************************************
* 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) 1997-2012 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. */
#include "config.h"
#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"
#ifdef GLIB_COMPILATION
#include "gstrfuncs.h"
#else
#include <glib.h>
#endif
/* When PCRE_DEBUG is defined, we need the pcre(16)_printint() function, which
is also used by pcretest. PCRE_DEBUG is not defined when building a production
library. We do not need to select pcre16_printint.c specially, because the
COMPILE_PCREx macro will already be appropriately set. */
#ifdef PCRE_DEBUG
/* pcre_printint.c should not include any headers */
#define PCRE_INCLUDED
#include "pcre_printint.c"
#undef PCRE_INCLUDED
#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 for most patterns. However, the memory can get
filled up by repetitions of forward references, for example patterns like
/(?1){0,1999}(b)/, and one user did hit the limit. The code has been changed so
that the workspace is expanded using malloc() in this situation. The value
below is therefore a minimum, and we put a maximum on it for safety. The
minimum is now also defined in terms of LINK_SIZE so that the use of malloc()
kicks in at the same number of forward references in all cases. */
#define COMPILE_WORK_SIZE (2048*LINK_SIZE)
#define COMPILE_WORK_SIZE_MAX (100*COMPILE_WORK_SIZE)
/* The overrun tests check for a slightly smaller size so that they detect the
overrun before it actually does run off the end of the data block. */
#define WORK_SIZE_SAFETY_MARGIN (100)
/* Private flags added to firstchar and reqchar. */
#define REQ_CASELESS 0x10000000l /* Indicates caselessness */
#define REQ_VARY 0x20000000l /* Reqchar followed non-literal item */
/* Repeated character flags. */
#define UTF_LENGTH 0x10000000l /* The char contains its length. */
/* 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 or for EBCDIC systems running
in UTF-8 mode. */
static const short int escapes[] = {
0, 0,
0, 0,
0, 0,
0, 0,
0, 0,
CHAR_COLON, CHAR_SEMICOLON,
CHAR_LESS_THAN_SIGN, CHAR_EQUALS_SIGN,
CHAR_GREATER_THAN_SIGN, CHAR_QUESTION_MARK,
CHAR_COMMERCIAL_AT, -ESC_A,
-ESC_B, -ESC_C,
-ESC_D, -ESC_E,
0, -ESC_G,
-ESC_H, 0,
0, -ESC_K,
0, 0,
-ESC_N, 0,
-ESC_P, -ESC_Q,
-ESC_R, -ESC_S,
0, 0,
-ESC_V, -ESC_W,
-ESC_X, 0,
-ESC_Z, CHAR_LEFT_SQUARE_BRACKET,
CHAR_BACKSLASH, CHAR_RIGHT_SQUARE_BRACKET,
CHAR_CIRCUMFLEX_ACCENT, CHAR_UNDERSCORE,
CHAR_GRAVE_ACCENT, 7,
-ESC_b, 0,
-ESC_d, ESC_e,
ESC_f, 0,
-ESC_h, 0,
0, -ESC_k,
0, 0,
ESC_n, 0,
-ESC_p, 0,
ESC_r, -ESC_s,
ESC_tee, 0,
-ESC_v, -ESC_w,
0, 0,
-ESC_z
};
#else
/* This is the "abnormal" table for EBCDIC systems without UTF-8 support. */
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,-ESC_N, 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. The
string is built from string macros so that it works in UTF-8 mode on EBCDIC
platforms. */
typedef struct verbitem {
int len; /* Length of verb name */
int op; /* Op when no arg, or -1 if arg mandatory */
int op_arg; /* Op when arg present, or -1 if not allowed */
} verbitem;
static const char verbnames[] =
"\0" /* Empty name is a shorthand for MARK */
STRING_MARK0
STRING_ACCEPT0
STRING_COMMIT0
STRING_F0
STRING_FAIL0
STRING_PRUNE0
STRING_SKIP0
STRING_THEN;
static const verbitem verbs[] = {
{ 0, -1, OP_MARK },
{ 4, -1, OP_MARK },
{ 6, OP_ACCEPT, -1 },
{ 6, OP_COMMIT, -1 },
{ 1, OP_FAIL, -1 },
{ 4, OP_FAIL, -1 },
{ 5, OP_PRUNE, OP_PRUNE_ARG },
{ 4, OP_SKIP, OP_SKIP_ARG },
{ 4, OP_THEN, OP_THEN_ARG }
};
static const 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[] =
STRING_alpha0 STRING_lower0 STRING_upper0 STRING_alnum0
STRING_ascii0 STRING_blank0 STRING_cntrl0 STRING_digit0
STRING_graph0 STRING_print0 STRING_punct0 STRING_space0
STRING_word0 STRING_xdigit;
static const pcre_uint8 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 */
};
/* Table of substitutes for \d etc when PCRE_UCP is set. The POSIX class
substitutes must be in the order of the names, defined above, and there are
both positive and negative cases. NULL means no substitute. */
#ifdef SUPPORT_UCP
static const pcre_uchar string_PNd[] = {
CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
CHAR_N, CHAR_d, CHAR_RIGHT_CURLY_BRACKET, '\0' };
static const pcre_uchar string_pNd[] = {
CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
CHAR_N, CHAR_d, CHAR_RIGHT_CURLY_BRACKET, '\0' };
static const pcre_uchar string_PXsp[] = {
CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
CHAR_X, CHAR_s, CHAR_p, CHAR_RIGHT_CURLY_BRACKET, '\0' };
static const pcre_uchar string_pXsp[] = {
CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
CHAR_X, CHAR_s, CHAR_p, CHAR_RIGHT_CURLY_BRACKET, '\0' };
static const pcre_uchar string_PXwd[] = {
CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
CHAR_X, CHAR_w, CHAR_d, CHAR_RIGHT_CURLY_BRACKET, '\0' };
static const pcre_uchar string_pXwd[] = {
CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
CHAR_X, CHAR_w, CHAR_d, CHAR_RIGHT_CURLY_BRACKET, '\0' };
static const pcre_uchar *substitutes[] = {
string_PNd, /* \D */
string_pNd, /* \d */
string_PXsp, /* \S */ /* NOTE: Xsp is Perl space */
string_pXsp, /* \s */
string_PXwd, /* \W */
string_pXwd /* \w */
};
static const pcre_uchar string_pL[] = {
CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
CHAR_L, CHAR_RIGHT_CURLY_BRACKET, '\0' };
static const pcre_uchar string_pLl[] = {
CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
CHAR_L, CHAR_l, CHAR_RIGHT_CURLY_BRACKET, '\0' };
static const pcre_uchar string_pLu[] = {
CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
CHAR_L, CHAR_u, CHAR_RIGHT_CURLY_BRACKET, '\0' };
static const pcre_uchar string_pXan[] = {
CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
CHAR_X, CHAR_a, CHAR_n, CHAR_RIGHT_CURLY_BRACKET, '\0' };
static const pcre_uchar string_h[] = {
CHAR_BACKSLASH, CHAR_h, '\0' };
static const pcre_uchar string_pXps[] = {
CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
CHAR_X, CHAR_p, CHAR_s, CHAR_RIGHT_CURLY_BRACKET, '\0' };
static const pcre_uchar string_PL[] = {
CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
CHAR_L, CHAR_RIGHT_CURLY_BRACKET, '\0' };
static const pcre_uchar string_PLl[] = {
CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
CHAR_L, CHAR_l, CHAR_RIGHT_CURLY_BRACKET, '\0' };
static const pcre_uchar string_PLu[] = {
CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
CHAR_L, CHAR_u, CHAR_RIGHT_CURLY_BRACKET, '\0' };
static const pcre_uchar string_PXan[] = {
CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
CHAR_X, CHAR_a, CHAR_n, CHAR_RIGHT_CURLY_BRACKET, '\0' };
static const pcre_uchar string_H[] = {
CHAR_BACKSLASH, CHAR_H, '\0' };
static const pcre_uchar string_PXps[] = {
CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
CHAR_X, CHAR_p, CHAR_s, CHAR_RIGHT_CURLY_BRACKET, '\0' };
static const pcre_uchar *posix_substitutes[] = {
string_pL, /* alpha */
string_pLl, /* lower */
string_pLu, /* upper */
string_pXan, /* alnum */
NULL, /* ascii */
string_h, /* blank */
NULL, /* cntrl */
string_pNd, /* digit */
NULL, /* graph */
NULL, /* print */
NULL, /* punct */
string_pXps, /* space */ /* NOTE: Xps is POSIX space */
string_pXwd, /* word */
NULL, /* xdigit */
/* Negated cases */
string_PL, /* ^alpha */
string_PLl, /* ^lower */
string_PLu, /* ^upper */
string_PXan, /* ^alnum */
NULL, /* ^ascii */
string_H, /* ^blank */
NULL, /* ^cntrl */
string_PNd, /* ^digit */
NULL, /* ^graph */
NULL, /* ^print */
NULL, /* ^punct */
string_PXps, /* ^space */ /* NOTE: Xps is POSIX space */
string_PXwd, /* ^word */
NULL /* ^xdigit */
};
#define POSIX_SUBSIZE (sizeof(posix_substitutes) / sizeof(pcre_uchar *))
#endif
#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.
Each substring ends with \0 to insert a null character. This includes the final
substring, so that the whole string ends with \0\0, which can be detected when
counting through. */
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 (? or (?-\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 compiled without UTF 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{name}, \\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 in 8-bit non-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" /** DEAD **/
"inconsistent NEWLINE options\0"
"\\g is not followed by a braced, angle-bracketed, or quoted name/number or by a plain number\0"
"a numbered reference must not be zero\0"
"an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT)\0"
/* 60 */
"(*VERB) not recognized\0"
"number is too big\0"
"subpattern name expected\0"
"digit expected after (?+\0"
"] is an invalid data character in JavaScript compatibility mode\0"
/* 65 */
"different names for subpatterns of the same number are not allowed\0"
"(*MARK) must have an argument\0"
"this version of PCRE is not compiled with Unicode property support\0"
"\\c must be followed by an ASCII character\0"
"\\k is not followed by a braced, angle-bracketed, or quoted name\0"
/* 70 */
"internal error: unknown opcode in find_fixedlength()\0"
"\\N is not supported in a class\0"
"too many forward references\0"
"disallowed Unicode code point (>= 0xd800 && <= 0xdfff)\0"
"invalid UTF-16 string\0"
/* 75 */
"name is too long in (*MARK), (*PRUNE), (*SKIP), or (*THEN)\0"
"character value in \\u.... sequence is too large\0"
;
/* Table to identify digits and hex digits. This is used when compiling
patterns. Note that the tables in chartables are dependent on the locale, and
may mark arbitrary characters as digits - but the PCRE compiling code expects
to handle only 0-9, a-z, and A-Z as digits when compiling. That is why we have
a private table here. It costs 256 bytes, but it is a lot faster than doing
character value tests (at least in some simple cases I timed), and in some
applications one wants PCRE to compile efficiently as well as match
efficiently.
For convenience, we use the same bit definitions as in chartables:
0x04 decimal digit
0x08 hexadecimal digit
Then we can use ctype_digit and ctype_xdigit in the code. */
/* Using a simple comparison for decimal numbers rather than a memory read
is much faster, and the resulting code is simpler (the compiler turns it
into a subtraction and unsigned comparison). */
#define IS_DIGIT(x) ((x) >= CHAR_0 && (x) <= CHAR_9)
#if 0
#ifndef EBCDIC
/* This is the "normal" case, for ASCII systems, and EBCDIC systems running in
UTF-8 mode. */
static const pcre_uint8 digitab[] =
{
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 0- 7 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 8- 15 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 16- 23 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 24- 31 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* - ' */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* ( - / */
0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c, /* 0 - 7 */
0x0c,0x0c,0x00,0x00,0x00,0x00,0x00,0x00, /* 8 - ? */
0x00,0x08,0x08,0x08,0x08,0x08,0x08,0x00, /* @ - G */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* H - O */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* P - W */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* X - _ */
0x00,0x08,0x08,0x08,0x08,0x08,0x08,0x00, /* ` - g */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* h - o */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* p - w */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* x -127 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 128-135 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 136-143 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 144-151 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 152-159 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 160-167 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 168-175 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 176-183 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 184-191 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 192-199 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 200-207 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 208-215 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 216-223 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 224-231 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 232-239 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 240-247 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};/* 248-255 */
#else
/* This is the "abnormal" case, for EBCDIC systems not running in UTF-8 mode. */
static const pcre_uint8 digitab[] =
{
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 0- 7 0 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 8- 15 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 16- 23 10 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 24- 31 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 32- 39 20 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 40- 47 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 48- 55 30 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 56- 63 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* - 71 40 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 72- | */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* & - 87 50 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 88- 95 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* - -103 60 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 104- ? */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 112-119 70 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 120- " */
0x00,0x08,0x08,0x08,0x08,0x08,0x08,0x00, /* 128- g 80 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* h -143 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 144- p 90 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* q -159 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 160- x A0 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* y -175 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* ^ -183 B0 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 184-191 */
0x00,0x08,0x08,0x08,0x08,0x08,0x08,0x00, /* { - G C0 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* H -207 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* } - P D0 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* Q -223 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* \ - X E0 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* Y -239 */
0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c, /* 0 - 7 F0 */
0x0c,0x0c,0x00,0x00,0x00,0x00,0x00,0x00};/* 8 -255 */
static const pcre_uint8 ebcdic_chartab[] = { /* chartable partial dup */
0x80,0x00,0x00,0x00,0x00,0x01,0x00,0x00, /* 0- 7 */
0x00,0x00,0x00,0x00,0x01,0x01,0x00,0x00, /* 8- 15 */
0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00, /* 16- 23 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 24- 31 */
0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00, /* 32- 39 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 40- 47 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 48- 55 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 56- 63 */
0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* - 71 */
0x00,0x00,0x00,0x80,0x00,0x80,0x80,0x80, /* 72- | */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* & - 87 */
0x00,0x00,0x00,0x80,0x80,0x80,0x00,0x00, /* 88- 95 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* - -103 */
0x00,0x00,0x00,0x00,0x00,0x10,0x00,0x80, /* 104- ? */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 112-119 */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 120- " */
0x00,0x1a,0x1a,0x1a,0x1a,0x1a,0x1a,0x12, /* 128- g */
0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* h -143 */
0x00,0x12,0x12,0x12,0x12,0x12,0x12,0x12, /* 144- p */
0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* q -159 */
0x00,0x00,0x12,0x12,0x12,0x12,0x12,0x12, /* 160- x */
0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* y -175 */
0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* ^ -183 */
0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00, /* 184-191 */
0x80,0x1a,0x1a,0x1a,0x1a,0x1a,0x1a,0x12, /* { - G */
0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* H -207 */
0x00,0x12,0x12,0x12,0x12,0x12,0x12,0x12, /* } - P */
0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* Q -223 */
0x00,0x00,0x12,0x12,0x12,0x12,0x12,0x12, /* \ - X */
0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* Y -239 */
0x1c,0x1c,0x1c,0x1c,0x1c,0x1c,0x1c,0x1c, /* 0 - 7 */
0x1c,0x1c,0x00,0x00,0x00,0x00,0x00,0x00};/* 8 -255 */
#endif
#endif /* 0 */
/* Definition to allow mutual recursion */
static BOOL
compile_regex(int, pcre_uchar **, const pcre_uchar **, int *, BOOL, BOOL, int, 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) {};
if (*s == 0) return "Error text not found (please report)";
}
return s;
}
/*************************************************
* Expand the workspace *
*************************************************/
/* This function is called during the second compiling phase, if the number of
forward references fills the existing workspace, which is originally a block on
the stack. A larger block is obtained from malloc() unless the ultimate limit
has been reached or the increase will be rather small.
Argument: pointer to the compile data block
Returns: 0 if all went well, else an error number
*/
static int
expand_workspace(compile_data *cd)
{
pcre_uchar *newspace;
int newsize = cd->workspace_size * 2;
if (newsize > COMPILE_WORK_SIZE_MAX) newsize = COMPILE_WORK_SIZE_MAX;
if (cd->workspace_size >= COMPILE_WORK_SIZE_MAX ||
newsize - cd->workspace_size < WORK_SIZE_SAFETY_MARGIN)
return ERR72;
newspace = (PUBL(malloc))(IN_UCHARS(newsize));
if (newspace == NULL) return ERR21;
memcpy(newspace, cd->start_workspace, cd->workspace_size * sizeof(pcre_uchar));
cd->hwm = (pcre_uchar *)newspace + (cd->hwm - cd->start_workspace);
if (cd->workspace_size > COMPILE_WORK_SIZE)
(PUBL(free))((void *)cd->start_workspace);
cd->start_workspace = newspace;
cd->workspace_size = newsize;
return 0;
}
/*************************************************
* 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 pcre_uchar *p)
{
if (!IS_DIGIT(*p)) return FALSE;
p++;
while (IS_DIGIT(*p)) p++;
if (*p == CHAR_RIGHT_CURLY_BRACKET) return TRUE;
if (*p++ != CHAR_COMMA) return FALSE;
if (*p == CHAR_RIGHT_CURLY_BRACKET) return TRUE;
if (!IS_DIGIT(*p)) return FALSE;
p++;
while (IS_DIGIT(*p)) p++;
return (*p == CHAR_RIGHT_CURLY_BRACKET);
}
/*************************************************
* 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 pcre_uchar **ptrptr, int *errorcodeptr, int bracount,
int options, BOOL isclass)
{
/* PCRE_UTF16 has the same value as PCRE_UTF8. */
BOOL utf = (options & PCRE_UTF8) != 0;
const pcre_uchar *ptr = *ptrptr + 1;
pcre_int32 c;
int 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-alphanumerics 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/UTF-8 coding */
/* Not alphanumeric */
else if (c < CHAR_0 || c > CHAR_z) {}
else if ((i = escapes[c - CHAR_0]) != 0) c = i;
#else /* EBCDIC coding */
/* Not alphanumeric */
else if (c < 'a' || (!MAX_255(c) || (ebcdic_chartab[c] & 0x0E) == 0)) {}
else if ((i = escapes[c - 0x48]) != 0) c = i;
#endif
/* Escapes that need further processing, or are illegal. */
else
{
const pcre_uchar *oldptr;
BOOL braced, negated;
switch (c)
{
/* A number of Perl escapes are not handled by PCRE. We give an explicit
error. */
case CHAR_l:
case CHAR_L:
*errorcodeptr = ERR37;
break;
case CHAR_u:
if ((options & PCRE_JAVASCRIPT_COMPAT) != 0)
{
/* In JavaScript, \u must be followed by four hexadecimal numbers.
Otherwise it is a lowercase u letter. */
if (MAX_255(ptr[1]) && g_ascii_isxdigit(ptr[1]) != 0
&& MAX_255(ptr[2]) && g_ascii_isxdigit(ptr[2]) != 0
&& MAX_255(ptr[3]) && g_ascii_isxdigit(ptr[3]) != 0
&& MAX_255(ptr[4]) && g_ascii_isxdigit(ptr[4]) != 0)
{
c = 0;
for (i = 0; i < 4; ++i)
{
int cc = *(++ptr);
#ifndef EBCDIC /* ASCII/UTF-8 coding */
if (cc >= CHAR_a) cc -= 32; /* Convert to upper case */
c = (c << 4) + cc - ((cc < CHAR_A)? CHAR_0 : (CHAR_A - 10));
#else /* EBCDIC coding */
if (cc >= CHAR_a && cc <= CHAR_z) cc += 64; /* Convert to upper case */
c = (c << 4) + cc - ((cc >= CHAR_0)? CHAR_0 : (CHAR_A - 10));
#endif
}
#ifdef COMPILE_PCRE8
if (c > (utf ? 0x10ffff : 0xff))
#else
#ifdef COMPILE_PCRE16
if (c > (utf ? 0x10ffff : 0xffff))
#endif
#endif
{
*errorcodeptr = ERR76;
}
else if (utf && c >= 0xd800 && c <= 0xdfff) *errorcodeptr = ERR73;
}
}
else
*errorcodeptr = ERR37;
break;
case CHAR_U:
/* In JavaScript, \U is an uppercase U letter. */
if ((options & PCRE_JAVASCRIPT_COMPAT) == 0) *errorcodeptr = ERR37;
break;
/* In a character class, \g is just a literal "g". Outside a character
class, \g must be followed by one of a number of specific things:
(1) 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.
(2) 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.
(3) For Oniguruma compatibility we also support \g followed by a name or a
number either in angle brackets or in single quotes. However, these are
(possibly recursive) subroutine calls, _not_ backreferences. Just return
the -ESC_g code (cf \k). */
case CHAR_g:
if (isclass) break;
if (ptr[1] == CHAR_LESS_THAN_SIGN || ptr[1] == CHAR_APOSTROPHE)
{
c = -ESC_g;
break;
}
/* Handle the Perl-compatible cases */
if (ptr[1] == CHAR_LEFT_CURLY_BRACKET)
{
const pcre_uchar *p;
for (p = ptr+2; *p != 0 && *p != CHAR_RIGHT_CURLY_BRACKET; p++)
if (*p != CHAR_MINUS && !IS_DIGIT(*p)) break;
if (*p != 0 && *p != CHAR_RIGHT_CURLY_BRACKET)
{
c = -ESC_k;
break;
}
braced = TRUE;
ptr++;
}
else braced = FALSE;
if (ptr[1] == CHAR_MINUS)
{
negated = TRUE;
ptr++;
}
else negated = FALSE;
/* The integer range is limited by the machine's int representation. */
c = 0;
while (IS_DIGIT(ptr[1]))
{
if (((unsigned int)c) > INT_MAX / 10) /* Integer overflow */
{
c = -1;
break;
}
c = c * 10 + *(++ptr) - CHAR_0;
}
if (((unsigned int)c) > INT_MAX) /* Integer overflow */
{
while (IS_DIGIT(ptr[1]))
ptr++;
*errorcodeptr = ERR61;
break;
}
if (braced && *(++ptr) != CHAR_RIGHT_CURLY_BRACKET)
{
*errorcodeptr = ERR57;
break;
}
if (c == 0)
{
*errorcodeptr = ERR58;
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 CHAR_1: case CHAR_2: case CHAR_3: case CHAR_4: case CHAR_5:
case CHAR_6: case CHAR_7: case CHAR_8: case CHAR_9:
if (!isclass)
{
oldptr = ptr;
/* The integer range is limited by the machine's int representation. */
c -= CHAR_0;
while (IS_DIGIT(ptr[1]))
{
if (((unsigned int)c) > INT_MAX / 10) /* Integer overflow */
{
c = -1;
break;
}
c = c * 10 + *(++ptr) - CHAR_0;
}
if (((unsigned int)c) > INT_MAX) /* Integer overflow */
{
while (IS_DIGIT(ptr[1]))
ptr++;
*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) >= CHAR_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 and 16-bit mode,
but no more than 3 octal digits. */
case CHAR_0:
c -= CHAR_0;
while(i++ < 2 && ptr[1] >= CHAR_0 && ptr[1] <= CHAR_7)
c = c * 8 + *(++ptr) - CHAR_0;
#ifdef COMPILE_PCRE8
if (!utf && c > 0xff) *errorcodeptr = ERR51;
#endif
break;
/* \x is complicated. \x{ddd} is a character number which can be greater
than 0xff in utf or non-8bit mode, but only if the ddd are hex digits.
If not, { is treated as a data character. */
case CHAR_x:
if ((options & PCRE_JAVASCRIPT_COMPAT) != 0)
{
/* In JavaScript, \x must be followed by two hexadecimal numbers.
Otherwise it is a lowercase x letter. */
if (MAX_255(ptr[1]) && g_ascii_isxdigit(ptr[1]) != 0
&& MAX_255(ptr[2]) && g_ascii_isxdigit(ptr[2]) != 0)
{
c = 0;
for (i = 0; i < 2; ++i)
{
int cc = *(++ptr);
#ifndef EBCDIC /* ASCII/UTF-8 coding */
if (cc >= CHAR_a) cc -= 32; /* Convert to upper case */
c = (c << 4) + cc - ((cc < CHAR_A)? CHAR_0 : (CHAR_A - 10));
#else /* EBCDIC coding */
if (cc >= CHAR_a && cc <= CHAR_z) cc += 64; /* Convert to upper case */
c = (c << 4) + cc - ((cc >= CHAR_0)? CHAR_0 : (CHAR_A - 10));
#endif
}
}
break;
}
if (ptr[1] == CHAR_LEFT_CURLY_BRACKET)
{
const pcre_uchar *pt = ptr + 2;
c = 0;
while (MAX_255(*pt) && g_ascii_isxdigit(*pt) != 0)
{
int cc = *pt++;
if (c == 0 && cc == CHAR_0) continue; /* Leading zeroes */
#ifndef EBCDIC /* ASCII/UTF-8 coding */
if (cc >= CHAR_a) cc -= 32; /* Convert to upper case */
c = (c << 4) + cc - ((cc < CHAR_A)? CHAR_0 : (CHAR_A - 10));
#else /* EBCDIC coding */
if (cc >= CHAR_a && cc <= CHAR_z) cc += 64; /* Convert to upper case */
c = (c << 4) + cc - ((cc >= CHAR_0)? CHAR_0 : (CHAR_A - 10));
#endif
#ifdef COMPILE_PCRE8
if (c > (utf ? 0x10ffff : 0xff)) { c = -1; break; }
#else
#ifdef COMPILE_PCRE16
if (c > (utf ? 0x10ffff : 0xffff)) { c = -1; break; }
#endif
#endif
}
if (c < 0)
{
while (MAX_255(*pt) && g_ascii_isxdigit(*pt) != 0) pt++;
*errorcodeptr = ERR34;
}
if (*pt == CHAR_RIGHT_CURLY_BRACKET)
{
if (utf && c >= 0xd800 && c <= 0xdfff) *errorcodeptr = ERR73;
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 && MAX_255(ptr[1]) && g_ascii_isxdigit(ptr[1]) != 0)
{
int cc; /* Some compilers don't like */
cc = *(++ptr); /* ++ in initializers */
#ifndef EBCDIC /* ASCII/UTF-8 coding */
if (cc >= CHAR_a) cc -= 32; /* Convert to upper case */
c = c * 16 + cc - ((cc < CHAR_A)? CHAR_0 : (CHAR_A - 10));
#else /* EBCDIC coding */
if (cc <= CHAR_z) cc += 64; /* Convert to upper case */
c = c * 16 + cc - ((cc >= CHAR_0)? CHAR_0 : (CHAR_A - 10));
#endif
}
break;
/* For \c, a following letter is upper-cased; then the 0x40 bit is flipped.
An error is given if the byte following \c is not an ASCII character. This
coding is ASCII-specific, but then the whole concept of \cx is
ASCII-specific. (However, an EBCDIC equivalent has now been added.) */
case CHAR_c:
c = *(++ptr);
if (c == 0)
{
*errorcodeptr = ERR2;
break;
}
#ifndef EBCDIC /* ASCII/UTF-8 coding */
if (c > 127) /* Excludes all non-ASCII in either mode */
{
*errorcodeptr = ERR68;
break;
}
if (c >= CHAR_a && c <= CHAR_z) c -= 32;
c ^= 0x40;
#else /* EBCDIC coding */
if (c >= CHAR_a && c <= CHAR_z) c += 64;
c ^= 0xC0;
#endif
break;
/* PCRE_EXTRA enables extensions to Perl in the matter of escapes. Any
other alphanumeric 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;
}
}
/* Perl supports \N{name} for character names, as well as plain \N for "not
newline". PCRE does not support \N{name}. However, it does support
quantification such as \N{2,3}. */
if (c == -ESC_N && ptr[1] == CHAR_LEFT_CURLY_BRACKET &&
!is_counted_repeat(ptr+2))
*errorcodeptr = ERR37;
/* If PCRE_UCP is set, we change the values for \d etc. */
if ((options & PCRE_UCP) != 0 && c <= -ESC_D && c >= -ESC_w)
c -= (ESC_DU - ESC_D);
/* Set the pointer to the final character before returning. */
*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 pcre_uchar **ptrptr, BOOL *negptr, int *dptr, int *errorcodeptr)
{
int c, i, bot, top;
const pcre_uchar *ptr = *ptrptr;
pcre_uchar 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 == CHAR_LEFT_CURLY_BRACKET)
{
if (ptr[1] == CHAR_CIRCUMFLEX_ACCENT)
{
*negptr = TRUE;
ptr++;
}
for (i = 0; i < (int)(sizeof(name) / sizeof(pcre_uchar)) - 1; i++)
{
c = *(++ptr);
if (c == 0) goto ERROR_RETURN;
if (c == CHAR_RIGHT_CURLY_BRACKET) break;
name[i] = c;
}
if (c != CHAR_RIGHT_CURLY_BRACKET) 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 = PRIV(utt_size);
while (bot < top)
{
i = (bot + top) >> 1;
c = STRCMP_UC_C8(name, PRIV(utt_names) + PRIV(utt)[i].name_offset);
if (c == 0)
{
*dptr = PRIV(utt)[i].value;
return PRIV(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
/*************************************************
* 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 pcre_uchar *
read_repeat_counts(const pcre_uchar *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 (IS_DIGIT(*p)) min = min * 10 + *p++ - CHAR_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 == CHAR_RIGHT_CURLY_BRACKET) max = min; else
{
if (*(++p) != CHAR_RIGHT_CURLY_BRACKET)
{
max = 0;
while(IS_DIGIT(*p)) max = max * 10 + *p++ - CHAR_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;
}
/*************************************************
* Subroutine for finding forward reference *
*************************************************/
/* This recursive function is called only from find_parens() below. The
top-level call starts at the beginning of the pattern. All other calls must
start at a parenthesis. It 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. Recursion is used to keep
track of subpatterns that reset the capturing group numbers - the (?| feature.
This function was originally called only from the second pass, in which we know
that if (?< or (?' or (?P< is encountered, the name will be correctly
terminated because that is checked in the first pass. There is now one call to
this function in the first pass, to check for a recursive back reference by
name (so that we can make the whole group atomic). In this case, we need check
only up to the current position in the pattern, and that is still OK because
and previous occurrences will have been checked. To make this work, the test
for "end of pattern" is a check against cd->end_pattern in the main loop,
instead of looking for a binary zero. This means that the special first-pass
call can adjust cd->end_pattern temporarily. (Checks for binary zero while
processing items within the loop are OK, because afterwards the main loop will
terminate.)
Arguments:
ptrptr address of the current character pointer (updated)
cd compile background data
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
utf TRUE if we are in UTF-8 / UTF-16 mode
count pointer to the current capturing subpattern number (updated)
Returns: the number of the named subpattern, or -1 if not found
*/
static int
find_parens_sub(pcre_uchar **ptrptr, compile_data *cd, const pcre_uchar *name, int lorn,
BOOL xmode, BOOL utf, int *count)
{
pcre_uchar *ptr = *ptrptr;
int start_count = *count;
int hwm_count = start_count;
BOOL dup_parens = FALSE;
/* If the first character is a parenthesis, check on the type of group we are
dealing with. The very first call may not start with a parenthesis. */
if (ptr[0] == CHAR_LEFT_PARENTHESIS)
{
/* Handle specials such as (*SKIP) or (*UTF8) etc. */
if (ptr[1] == CHAR_ASTERISK) ptr += 2;
/* Handle a normal, unnamed capturing parenthesis. */
else if (ptr[1] != CHAR_QUESTION_MARK)
{
*count += 1;
if (name == NULL && *count == lorn) return *count;
ptr++;
}
/* All cases now have (? at the start. Remember when we are in a group
where the parenthesis numbers are duplicated. */
else if (ptr[2] == CHAR_VERTICAL_LINE)
{
ptr += 3;
dup_parens = TRUE;
}
/* Handle comments; all characters are allowed until a ket is reached. */
else if (ptr[2] == CHAR_NUMBER_SIGN)
{
for (ptr += 3; *ptr != 0; ptr++) if (*ptr == CHAR_RIGHT_PARENTHESIS) break;
goto FAIL_EXIT;
}
/* Handle a condition. If it is an assertion, just carry on so that it
is processed as normal. If not, skip to the closing parenthesis of the
condition (there can't be any nested parens). */
else if (ptr[2] == CHAR_LEFT_PARENTHESIS)
{
ptr += 2;
if (ptr[1] != CHAR_QUESTION_MARK)
{
while (*ptr != 0 && *ptr != CHAR_RIGHT_PARENTHESIS) ptr++;
if (*ptr != 0) ptr++;
}
}
/* Start with (? but not a condition. */
else
{
ptr += 2;
if (*ptr == CHAR_P) ptr++; /* Allow optional P */
/* We have to disambiguate (?<! and (?<= from (?<name> for named groups */
if ((*ptr == CHAR_LESS_THAN_SIGN && ptr[1] != CHAR_EXCLAMATION_MARK &&
ptr[1] != CHAR_EQUALS_SIGN) || *ptr == CHAR_APOSTROPHE)
{
int term;
const pcre_uchar *thisname;
*count += 1;
if (name == NULL && *count == lorn) return *count;
term = *ptr++;
if (term == CHAR_LESS_THAN_SIGN) term = CHAR_GREATER_THAN_SIGN;
thisname = ptr;
while (*ptr != term) ptr++;
if (name != NULL && lorn == ptr - thisname &&
STRNCMP_UC_UC(name, thisname, lorn) == 0)
return *count;
term++;
}
}
}
/* Past any initial parenthesis handling, scan for parentheses or vertical
bars. Stop if we get to cd->end_pattern. Note that this is important for the
first-pass call when this value is temporarily adjusted to stop at the current
position. So DO NOT change this to a test for binary zero. */
for (; ptr < cd->end_pattern; ptr++)
{
/* Skip over backslashed characters and also entire \Q...\E */
if (*ptr == CHAR_BACKSLASH)
{
if (*(++ptr) == 0) goto FAIL_EXIT;
if (*ptr == CHAR_Q) for (;;)
{
while (*(++ptr) != 0 && *ptr != CHAR_BACKSLASH) {};
if (*ptr == 0) goto FAIL_EXIT;
if (*(++ptr) == CHAR_E) break;
}
continue;
}
/* Skip over character classes; this logic must be similar to the way they
are handled for real. If the first character is '^', 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. Note the use of STR macros to
encode "Q\\E" so that it works in UTF-8 on EBCDIC platforms. */
if (*ptr == CHAR_LEFT_SQUARE_BRACKET)
{
BOOL negate_class = FALSE;
for (;;)
{
if (ptr[1] == CHAR_BACKSLASH)
{
if (ptr[2] == CHAR_E)
ptr+= 2;
else if (STRNCMP_UC_C8(ptr + 2,
STR_Q STR_BACKSLASH STR_E, 3) == 0)
ptr += 4;
else
break;
}
else if (!negate_class && ptr[1] == CHAR_CIRCUMFLEX_ACCENT)
{
negate_class = TRUE;
ptr++;
}
else break;
}
/* If the next character is ']', it is a data character that must be
skipped, except in JavaScript compatibility mode. */
if (ptr[1] == CHAR_RIGHT_SQUARE_BRACKET &&
(cd->external_options & PCRE_JAVASCRIPT_COMPAT) == 0)
ptr++;
while (*(++ptr) != CHAR_RIGHT_SQUARE_BRACKET)
{
if (*ptr == 0) return -1;
if (*ptr == CHAR_BACKSLASH)
{
if (*(++ptr) == 0) goto FAIL_EXIT;
if (*ptr == CHAR_Q) for (;;)
{
while (*(++ptr) != 0 && *ptr != CHAR_BACKSLASH) {};
if (*ptr == 0) goto FAIL_EXIT;
if (*(++ptr) == CHAR_E) break;
}
continue;
}
}
continue;
}
/* Skip comments in /x mode */
if (xmode && *ptr == CHAR_NUMBER_SIGN)
{
ptr++;
while (*ptr != 0)
{
if (IS_NEWLINE(ptr)) { ptr += cd->nllen - 1; break; }
ptr++;
#ifdef SUPPORT_UTF
if (utf) FORWARDCHAR(ptr);
#endif
}
if (*ptr == 0) goto FAIL_EXIT;
continue;
}
/* Check for the special metacharacters */
if (*ptr == CHAR_LEFT_PARENTHESIS)
{
int rc = find_parens_sub(&ptr, cd, name, lorn, xmode, utf, count);
if (rc > 0) return rc;
if (*ptr == 0) goto FAIL_EXIT;
}
else if (*ptr == CHAR_RIGHT_PARENTHESIS)
{
if (dup_parens && *count < hwm_count) *count = hwm_count;
goto FAIL_EXIT;
}
else if (*ptr == CHAR_VERTICAL_LINE && dup_parens)
{
if (*count > hwm_count) hwm_count = *count;
*count = start_count;
}
}
FAIL_EXIT:
*ptrptr = ptr;
return -1;
}
/*************************************************
* 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 used to be able to start this scan from the
current compiling point, using the current count value from cd->bracount, and
do it all in a single loop, but the addition of the possibility of duplicate
subpattern numbers means that we have to scan from the very start, in order to
take account of such duplicates, and to use a recursive function to keep track
of the different types of group.
Arguments:
cd compile background data
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
utf TRUE if we are in UTF-8 / UTF-16 mode
Returns: the number of the found subpattern, or -1 if not found
*/
static int
find_parens(compile_data *cd, const pcre_uchar *name, int lorn, BOOL xmode,
BOOL utf)
{
pcre_uchar *ptr = (pcre_uchar *)cd->start_pattern;
int count = 0;
int rc;
/* If the pattern does not start with an opening parenthesis, the first call
to find_parens_sub() will scan right to the end (if necessary). However, if it
does start with a parenthesis, find_parens_sub() will return when it hits the
matching closing parens. That is why we have to have a loop. */
for (;;)
{
rc = find_parens_sub(&ptr, cd, name, lorn, xmode, utf, &count);
if (rc > 0 || *ptr++ == 0) break;
}
return rc;
}
/*************************************************
* 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, 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
skipassert TRUE if certain assertions are to be skipped
Returns: pointer to the first significant opcode
*/
static const pcre_uchar*
first_significant_code(const pcre_uchar *code, BOOL skipassert)
{
for (;;)
{
switch ((int)*code)
{
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 += PRIV(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_NCREF:
case OP_RREF:
case OP_NRREF:
case OP_DEF:
code += PRIV(OP_lengths)[*code];
break;
default:
return code;
}
}
/* Control never reaches here */
}
/*************************************************
* Find the fixed length of a branch *
*************************************************/
/* Scan a branch 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. The branch is
temporarily terminated with OP_END when this function is called.
This function is called when a backward assertion is encountered, so that if it
fails, the error message can point to the correct place in the pattern.
However, we cannot do this when the assertion contains subroutine calls,
because they can be forward references. We solve this by remembering this case
and doing the check at the end; a flag specifies which mode we are running in.
Arguments:
code points to the start of the pattern (the bracket)
utf TRUE in UTF-8 / UTF-16 mode
atend TRUE if called when the pattern is complete
cd the "compile data" structure
Returns: the fixed length,
or -1 if there is no fixed length,
or -2 if \C was encountered (in UTF-8 mode only)
or -3 if an OP_RECURSE item was encountered and atend is FALSE
or -4 if an unknown opcode was encountered (internal error)
*/
static int
find_fixedlength(pcre_uchar *code, BOOL utf, BOOL atend, compile_data *cd)
{
int length = -1;
int branchlength = 0;
pcre_uchar *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;
pcre_uchar *ce, *cs;
int op = *cc;
switch (op)
{
/* We only need to continue for OP_CBRA (normal capturing bracket) and
OP_BRA (normal non-capturing bracket) because the other variants of these
opcodes are all concerned with unlimited repeated groups, which of course
are not of fixed length. */
case OP_CBRA:
case OP_BRA:
case OP_ONCE:
case OP_ONCE_NC:
case OP_COND:
d = find_fixedlength(cc + ((op == OP_CBRA)? IMM2_SIZE : 0), utf, atend, cd);
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. An ACCEPT is effectively
an ALT. If it is END it's the end of the outer call. All can be handled by
the same code. Note that we must not include the OP_KETRxxx opcodes here,
because they all imply an unlimited repeat. */
case OP_ALT:
case OP_KET:
case OP_END:
case OP_ACCEPT:
case OP_ASSERT_ACCEPT:
if (length < 0) length = branchlength;
else if (length != branchlength) return -1;
if (*cc != OP_ALT) return length;
cc += 1 + LINK_SIZE;
branchlength = 0;
break;
/* A true recursion implies not fixed length, but a subroutine call may
be OK. If the subroutine is a forward reference, we can't deal with
it until the end of the pattern, so return -3. */
case OP_RECURSE:
if (!atend) return -3;
cs = ce = (pcre_uchar *)cd->start_code + GET(cc, 1); /* Start subpattern */
do ce += GET(ce, 1); while (*ce == OP_ALT); /* End subpattern */
if (cc > cs && cc < ce) return -1; /* Recursion */
d = find_fixedlength(cs + IMM2_SIZE, utf, atend, cd);
if (d < 0) return d;
branchlength += d;
cc += 1 + LINK_SIZE;
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);
cc += PRIV(OP_lengths)[*cc];
break;
/* Skip over things that don't match chars */
case OP_MARK:
case OP_PRUNE_ARG:
case OP_SKIP_ARG:
case OP_THEN_ARG:
cc += cc[1] + PRIV(OP_lengths)[*cc];
break;
case OP_CALLOUT:
case OP_CIRC:
case OP_CIRCM:
case OP_CLOSE:
case OP_COMMIT:
case OP_CREF:
case OP_DEF:
case OP_DOLL:
case OP_DOLLM:
case OP_EOD:
case OP_EODN:
case OP_FAIL:
case OP_NCREF:
case OP_NRREF:
case OP_NOT_WORD_BOUNDARY:
case OP_PRUNE:
case OP_REVERSE:
case OP_RREF:
case OP_SET_SOM:
case OP_SKIP:
case OP_SOD:
case OP_SOM:
case OP_THEN:
case OP_WORD_BOUNDARY:
cc += PRIV(OP_lengths)[*cc];
break;
/* Handle literal characters */
case OP_CHAR:
case OP_CHARI:
case OP_NOT:
case OP_NOTI:
branchlength++;
cc += 2;
#ifdef SUPPORT_UTF
if (utf && HAS_EXTRALEN(cc[-1])) cc += GET_EXTRALEN(cc[-1]);
#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:
case OP_EXACTI:
case OP_NOTEXACT:
case OP_NOTEXACTI:
branchlength += GET2(cc,1);
cc += 2 + IMM2_SIZE;
#ifdef SUPPORT_UTF
if (utf && HAS_EXTRALEN(cc[-1])) cc += GET_EXTRALEN(cc[-1]);
#endif
break;
case OP_TYPEEXACT:
branchlength += GET2(cc,1);
if (cc[1 + IMM2_SIZE] == OP_PROP || cc[1 + IMM2_SIZE] == OP_NOTPROP) cc += 2;
cc += 1 + IMM2_SIZE + 1;
break;
/* Handle single-char matchers */
case OP_PROP:
case OP_NOTPROP:
cc += 2;
/* Fall through */
case OP_HSPACE:
case OP_VSPACE:
case OP_NOT_HSPACE:
case OP_NOT_VSPACE:
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_ALLANY:
branchlength++;
cc++;
break;
/* The single-byte matcher isn't allowed. This only happens in UTF-8 mode;
otherwise \C is coded as OP_ALLANY. */
case OP_ANYBYTE:
return -2;
/* Check a class for variable quantification */
#if defined SUPPORT_UTF || defined COMPILE_PCRE16
case OP_XCLASS:
cc += GET(cc, 1) - PRIV(OP_lengths)[OP_CLASS];
/* Fall through */
#endif
case OP_CLASS:
case OP_NCLASS:
cc += PRIV(OP_lengths)[OP_CLASS];
switch (*cc)
{
case OP_CRPLUS:
case OP_CRMINPLUS:
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,1+IMM2_SIZE)) return -1;
branchlength += GET2(cc,1);
cc += 1 + 2 * IMM2_SIZE;
break;
default:
branchlength++;
}
break;
/* Anything else is variable length */
case OP_ANYNL:
case OP_BRAMINZERO:
case OP_BRAPOS:
case OP_BRAPOSZERO:
case OP_BRAZERO:
case OP_CBRAPOS:
case OP_EXTUNI:
case OP_KETRMAX:
case OP_KETRMIN:
case OP_KETRPOS:
case OP_MINPLUS:
case OP_MINPLUSI:
case OP_MINQUERY:
case OP_MINQUERYI:
case OP_MINSTAR:
case OP_MINSTARI:
case OP_MINUPTO:
case OP_MINUPTOI:
case OP_NOTMINPLUS:
case OP_NOTMINPLUSI:
case OP_NOTMINQUERY:
case OP_NOTMINQUERYI:
case OP_NOTMINSTAR:
case OP_NOTMINSTARI:
case OP_NOTMINUPTO:
case OP_NOTMINUPTOI:
case OP_NOTPLUS:
case OP_NOTPLUSI:
case OP_NOTPOSPLUS:
case OP_NOTPOSPLUSI:
case OP_NOTPOSQUERY:
case OP_NOTPOSQUERYI:
case OP_NOTPOSSTAR:
case OP_NOTPOSSTARI:
case OP_NOTPOSUPTO:
case OP_NOTPOSUPTOI:
case OP_NOTQUERY:
case OP_NOTQUERYI:
case OP_NOTSTAR:
case OP_NOTSTARI:
case OP_NOTUPTO:
case OP_NOTUPTOI:
case OP_PLUS:
case OP_PLUSI:
case OP_POSPLUS:
case OP_POSPLUSI:
case OP_POSQUERY:
case OP_POSQUERYI:
case OP_POSSTAR:
case OP_POSSTARI:
case OP_POSUPTO:
case OP_POSUPTOI:
case OP_QUERY:
case OP_QUERYI:
case OP_REF:
case OP_REFI:
case OP_SBRA:
case OP_SBRAPOS:
case OP_SCBRA:
case OP_SCBRAPOS:
case OP_SCOND:
case OP_SKIPZERO:
case OP_STAR:
case OP_STARI:
case OP_TYPEMINPLUS:
case OP_TYPEMINQUERY:
case OP_TYPEMINSTAR:
case OP_TYPEMINUPTO:
case OP_TYPEPLUS:
case OP_TYPEPOSPLUS:
case OP_TYPEPOSQUERY:
case OP_TYPEPOSSTAR:
case OP_TYPEPOSUPTO:
case OP_TYPEQUERY:
case OP_TYPESTAR:
case OP_TYPEUPTO:
case OP_UPTO:
case OP_UPTOI:
return -1;
/* Catch unrecognized opcodes so that when new ones are added they
are not forgotten, as has happened in the past. */
default:
return -4;
}
}
/* Control never gets here */
}
/*************************************************
* Scan compiled regex for specific bracket *
*************************************************/
/* This little function scans through a compiled pattern until it finds a
capturing bracket with the given number, or, if the number is negative, an
instance of OP_REVERSE for a lookbehind. The function is global in the C sense
so that it can be called from pcre_study() when finding the minimum matching
length.
Arguments:
code points to start of expression
utf TRUE in UTF-8 / UTF-16 mode
number the required bracket number or negative to find a lookbehind
Returns: pointer to the opcode for the bracket, or NULL if not found
*/
const pcre_uchar *
PRIV(find_bracket)(const pcre_uchar *code, BOOL utf, int number)
{
for (;;)
{
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 recursion */
else if (c == OP_REVERSE)
{
if (number < 0) return (pcre_uchar *)code;
code += PRIV(OP_lengths)[c];
}
/* Handle capturing bracket */
else if (c == OP_CBRA || c == OP_SCBRA ||
c == OP_CBRAPOS || c == OP_SCBRAPOS)
{
int n = GET2(code, 1+LINK_SIZE);
if (n == number) return (pcre_uchar *)code;
code += PRIV(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, and for MARK/PRUNE/SKIP/THEN with an argument, we
must add in its length. */
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[1 + IMM2_SIZE] == OP_PROP
|| code[1 + IMM2_SIZE] == OP_NOTPROP) code += 2;
break;
case OP_MARK:
case OP_PRUNE_ARG:
case OP_SKIP_ARG:
code += code[1];
break;
case OP_THEN_ARG:
code += code[1];
break;
}
/* Add in the fixed length from the table */
code += PRIV(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_UTF
if (utf) switch(c)
{
case OP_CHAR:
case OP_CHARI:
case OP_EXACT:
case OP_EXACTI:
case OP_UPTO:
case OP_UPTOI:
case OP_MINUPTO:
case OP_MINUPTOI:
case OP_POSUPTO:
case OP_POSUPTOI:
case OP_STAR:
case OP_STARI:
case OP_MINSTAR:
case OP_MINSTARI:
case OP_POSSTAR:
case OP_POSSTARI:
case OP_PLUS:
case OP_PLUSI:
case OP_MINPLUS:
case OP_MINPLUSI:
case OP_POSPLUS:
case OP_POSPLUSI:
case OP_QUERY:
case OP_QUERYI:
case OP_MINQUERY:
case OP_MINQUERYI:
case OP_POSQUERY:
case OP_POSQUERYI:
if (HAS_EXTRALEN(code[-1])) code += GET_EXTRALEN(code[-1]);
break;
}
#else
(void)(utf); /* Keep compiler happy by referencing function argument */
#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
utf TRUE in UTF-8 / UTF-16 mode
Returns: pointer to the opcode for OP_RECURSE, or NULL if not found
*/
static const pcre_uchar *
find_recurse(const pcre_uchar *code, BOOL utf)
{
for (;;)
{
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, and for MARK/PRUNE/SKIP/THEN with an argument, we
must add in its length. */
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[1 + IMM2_SIZE] == OP_PROP
|| code[1 + IMM2_SIZE] == OP_NOTPROP) code += 2;
break;
case OP_MARK:
case OP_PRUNE_ARG:
case OP_SKIP_ARG:
code += code[1];
break;
case OP_THEN_ARG:
code += code[1];
break;
}
/* Add in the fixed length from the table */
code += PRIV(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_UTF
if (utf) switch(c)
{
case OP_CHAR:
case OP_CHARI:
case OP_NOT:
case OP_NOTI:
case OP_EXACT:
case OP_EXACTI:
case OP_NOTEXACT:
case OP_NOTEXACTI:
case OP_UPTO:
case OP_UPTOI:
case OP_NOTUPTO:
case OP_NOTUPTOI:
case OP_MINUPTO:
case OP_MINUPTOI:
case OP_NOTMINUPTO:
case OP_NOTMINUPTOI:
case OP_POSUPTO:
case OP_POSUPTOI:
case OP_NOTPOSUPTO:
case OP_NOTPOSUPTOI:
case OP_STAR:
case OP_STARI:
case OP_NOTSTAR:
case OP_NOTSTARI:
case OP_MINSTAR:
case OP_MINSTARI:
case OP_NOTMINSTAR:
case OP_NOTMINSTARI:
case OP_POSSTAR:
case OP_POSSTARI:
case OP_NOTPOSSTAR:
case OP_NOTPOSSTARI:
case OP_PLUS:
case OP_PLUSI:
case OP_NOTPLUS:
case OP_NOTPLUSI:
case OP_MINPLUS:
case OP_MINPLUSI:
case OP_NOTMINPLUS:
case OP_NOTMINPLUSI:
case OP_POSPLUS:
case OP_POSPLUSI:
case OP_NOTPOSPLUS:
case OP_NOTPOSPLUSI:
case OP_QUERY:
case OP_QUERYI:
case OP_NOTQUERY:
case OP_NOTQUERYI:
case OP_MINQUERY:
case OP_MINQUERYI:
case OP_NOTMINQUERY:
case OP_NOTMINQUERYI:
case OP_POSQUERY:
case OP_POSQUERYI:
case OP_NOTPOSQUERY:
case OP_NOTPOSQUERYI:
if (HAS_EXTRALEN(code[-1])) code += GET_EXTRALEN(code[-1]);
break;
}
#else
(void)(utf); /* Keep compiler happy by referencing function argument */
#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
backward and negative forward assertions when its final argument is TRUE. 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
utf TRUE if in UTF-8 / UTF-16 mode
cd contains pointers to tables etc.
Returns: TRUE if what is matched could be empty
*/
static BOOL
could_be_empty_branch(const pcre_uchar *code, const pcre_uchar *endcode,
BOOL utf, compile_data *cd)
{
int c;
for (code = first_significant_code(code + PRIV(OP_lengths)[*code], TRUE);
code < endcode;
code = first_significant_code(code + PRIV(OP_lengths)[c], TRUE))
{
const pcre_uchar *ccode;
c = *code;
/* Skip over forward assertions; the other assertions are skipped by
first_significant_code() with a TRUE final argument. */
if (c == OP_ASSERT)
{
do code += GET(code, 1); while (*code == OP_ALT);
c = *code;
continue;
}
/* For a recursion/subroutine call, if its end has been reached, which
implies a backward reference subroutine call, we can scan it. If it's a
forward reference subroutine call, we can't. To detect forward reference
we have to scan up the list that is kept in the workspace. This function is
called only when doing the real compile, not during the pre-compile that
measures the size of the compiled pattern. */
if (c == OP_RECURSE)
{
const pcre_uchar *scode;
BOOL empty_branch;
/* Test for forward reference */
for (scode = cd->start_workspace; scode < cd->hwm; scode += LINK_SIZE)
if (GET(scode, 0) == code + 1 - cd->start_code) return TRUE;
/* Not a forward reference, test for completed backward reference */
empty_branch = FALSE;
scode = cd->start_code + GET(code, 1);
if (GET(scode, 1) == 0) return TRUE; /* Unclosed */
/* Completed backwards reference */
do
{
if (could_be_empty_branch(scode, endcode, utf, cd))
{
empty_branch = TRUE;
break;
}
scode += GET(scode, 1);
}
while (*scode == OP_ALT);
if (!empty_branch) return FALSE; /* All branches are non-empty */
continue;
}
/* Groups with zero repeats can of course be empty; skip them. */
if (c == OP_BRAZERO || c == OP_BRAMINZERO || c == OP_SKIPZERO ||
c == OP_BRAPOSZERO)
{
code += PRIV(OP_lengths)[c];
do code += GET(code, 1); while (*code == OP_ALT);
c = *code;
continue;
}
/* A nested group that is already marked as "could be empty" can just be
skipped. */
if (c == OP_SBRA || c == OP_SBRAPOS ||
c == OP_SCBRA || c == OP_SCBRAPOS)
{
do code += GET(code, 1); while (*code == OP_ALT);
c = *code;
continue;
}
/* For other groups, scan the branches. */
if (c == OP_BRA || c == OP_BRAPOS ||
c == OP_CBRA || c == OP_CBRAPOS ||
c == OP_ONCE || c == OP_ONCE_NC ||
c == OP_COND)
{
BOOL empty_branch;
if (GET(code, 1) == 0) return TRUE; /* Hit unclosed bracket */
/* If a conditional group has only one branch, there is a second, implied,
empty branch, so just skip over the conditional, because it could be empty.
Otherwise, scan the individual branches of the group. */
if (c == OP_COND && code[GET(code, 1)] != OP_ALT)
code += GET(code, 1);
else
{
empty_branch = FALSE;
do
{
if (!empty_branch && could_be_empty_branch(code, endcode, utf, cd))
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 PRIV(OP_lengths)[] is zero; the
actual length is stored in the compiled code, so we must update "code"
here. */
#if defined SUPPORT_UTF || !defined COMPILE_PCRE8
case OP_XCLASS:
ccode = code += GET(code, 1);
goto CHECK_CLASS_REPEAT;
#endif
case OP_CLASS:
case OP_NCLASS:
ccode = code + PRIV(OP_lengths)[OP_CLASS];
#if defined SUPPORT_UTF || !defined COMPILE_PCRE8
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_ALLANY:
case OP_ANYBYTE:
case OP_CHAR:
case OP_CHARI:
case OP_NOT:
case OP_NOTI:
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[1 + IMM2_SIZE] == OP_PROP
|| code[1 + IMM2_SIZE] == OP_NOTPROP) code += 2;
break;
/* End of branch */
case OP_KET:
case OP_KETRMAX:
case OP_KETRMIN:
case OP_KETRPOS:
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_UTF
case OP_STAR:
case OP_STARI:
case OP_MINSTAR:
case OP_MINSTARI:
case OP_POSSTAR:
case OP_POSSTARI:
case OP_QUERY:
case OP_QUERYI:
case OP_MINQUERY:
case OP_MINQUERYI:
case OP_POSQUERY:
case OP_POSQUERYI:
if (utf && HAS_EXTRALEN(code[1])) code += GET_EXTRALEN(code[1]);
break;
case OP_UPTO:
case OP_UPTOI:
case OP_MINUPTO:
case OP_MINUPTOI:
case OP_POSUPTO:
case OP_POSUPTOI:
if (utf && HAS_EXTRALEN(code[1 + IMM2_SIZE])) code += GET_EXTRALEN(code[1 + IMM2_SIZE]);
break;
#endif
/* MARK, and PRUNE/SKIP/THEN with an argument must skip over the argument
string. */
case OP_MARK:
case OP_PRUNE_ARG:
case OP_SKIP_ARG:
code += code[1];
break;
case OP_THEN_ARG:
code += code[1];
break;
/* None of the remaining opcodes are required to match a character. */
default:
break;
}
}
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.
This function is called only during the real compile, not during the
pre-compile.
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
utf TRUE if in UTF-8 / UTF-16 mode
cd pointers to tables etc
Returns: TRUE if what is matched could be empty
*/
static BOOL
could_be_empty(const pcre_uchar *code, const pcre_uchar *endcode,
branch_chain *bcptr, BOOL utf, compile_data *cd)
{
while (bcptr != NULL && bcptr->current_branch >= code)
{
if (!could_be_empty_branch(bcptr->current_branch, endcode, utf, cd))
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 a
sequence of characters terminated by a matching ":]" or ".]" or "=]". If we
reach an unescaped ']' without the special preceding character, return FALSE.
Originally, this function only recognized a sequence of letters between the
terminators, but it seems that Perl recognizes any sequence of characters,
though of course unknown POSIX names are subsequently rejected. Perl gives an
"Unknown POSIX class" error for [:f\oo:] for example, where previously PCRE
didn't consider this to be a POSIX class. Likewise for [:1234:].
The problem in trying to be exactly like Perl is in the handling of escapes. We
have to be sure that [abc[:x\]pqr] is *not* treated as containing a POSIX
class, but [abc[:x\]pqr:]] is (so that an error can be generated). The code
below handles the special case of \], but does not try to do any other escape
processing. This makes it different from Perl for cases such as [:l\ower:]
where Perl recognizes it as the POSIX class "lower" but PCRE does not recognize
"l\ower". This is a lesser evil that not diagnosing bad classes when Perl does,
I think.
A user pointed out that PCRE was rejecting [:a[:digit:]] whereas Perl was not.
It seems that the appearance of a nested POSIX class supersedes an apparent
external class. For example, [:a[:digit:]b:] matches "a", "b", ":", or
a digit.
In Perl, unescaped square brackets may also appear as part of class names. For
example, [:a[:abc]b:] gives unknown POSIX class "[:abc]b:]". However, for
[:a[:abc]b][b:] it gives unknown POSIX class "[:abc]b][b:]", which does not
seem right at all. PCRE does not allow closing square brackets in POSIX class
names.
Arguments:
ptr pointer to the initial [
endptr where to return the end pointer
Returns: TRUE or FALSE
*/
static BOOL
check_posix_syntax(const pcre_uchar *ptr, const pcre_uchar **endptr)
{
int terminator; /* Don't combine these lines; the Solaris cc */
terminator = *(++ptr); /* compiler warns about "non-constant" initializer. */
for (++ptr; *ptr != 0; ptr++)
{
if (*ptr == CHAR_BACKSLASH && ptr[1] == CHAR_RIGHT_SQUARE_BRACKET)
ptr++;
else if (*ptr == CHAR_RIGHT_SQUARE_BRACKET) return FALSE;
else
{
if (*ptr == terminator && ptr[1] == CHAR_RIGHT_SQUARE_BRACKET)
{
*endptr = ptr;
return TRUE;
}
if (*ptr == CHAR_LEFT_SQUARE_BRACKET &&
(ptr[1] == CHAR_COLON || ptr[1] == CHAR_DOT ||
ptr[1] == CHAR_EQUALS_SIGN) &&
check_posix_syntax(ptr, endptr))
return FALSE;
}
}
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 pcre_uchar *ptr, int len)
{
const char *pn = posix_names;
int yield = 0;
while (posix_name_lengths[yield] != 0)
{
if (len == posix_name_lengths[yield] &&
STRNCMP_UC_C8(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 or OP_SKIPZERO 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
utf TRUE in UTF-8 / UTF-16 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(pcre_uchar *group, int adjust, BOOL utf, compile_data *cd,
pcre_uchar *save_hwm)
{
pcre_uchar *ptr = group;
while ((ptr = (pcre_uchar *)find_recurse(ptr, utf)) != NULL)
{
int offset;
pcre_uchar *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 pcre_uchar *
auto_callout(pcre_uchar *code, const pcre_uchar *ptr, compile_data *cd)
{
*code++ = OP_CALLOUT;
*code++ = 255;
PUT(code, 0, (int)(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(pcre_uchar *previous_callout, const pcre_uchar *ptr, compile_data *cd)
{
int length = (int)(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 = UCD_OTHERCASE(c)) != c) break; }
if (c > d) return FALSE;
*ocptr = othercase;
next = othercase + 1;
for (++c; c <= d; c++)
{
if (UCD_OTHERCASE(c) != next) break;
next++;
}
*odptr = next - 1;
*cptr = c;
return TRUE;
}
/*************************************************
* Check a character and a property *
*************************************************/
/* This function is called by check_auto_possessive() when a property item
is adjacent to a fixed character.
Arguments:
c the character
ptype the property type
pdata the data for the type
negated TRUE if it's a negated property (\P or \p{^)
Returns: TRUE if auto-possessifying is OK
*/
static BOOL
check_char_prop(int c, int ptype, int pdata, BOOL negated)
{
const pcre_uint8 chartype = UCD_CHARTYPE(c);
switch(ptype)
{
case PT_LAMP:
return (chartype == ucp_Lu ||
chartype == ucp_Ll ||
chartype == ucp_Lt) == negated;
case PT_GC:
return (pdata == PRIV(ucp_gentype)[chartype]) == negated;
case PT_PC:
return (pdata == chartype) == negated;
case PT_SC:
return (pdata == UCD_SCRIPT(c)) == negated;
/* These are specials */
case PT_ALNUM:
return (PRIV(ucp_gentype)[chartype] == ucp_L ||
PRIV(ucp_gentype)[chartype] == ucp_N) == negated;
case PT_SPACE: /* Perl space */
return (PRIV(ucp_gentype)[chartype] == ucp_Z ||
c == CHAR_HT || c == CHAR_NL || c == CHAR_FF || c == CHAR_CR)
== negated;
case PT_PXSPACE: /* POSIX space */
return (PRIV(ucp_gentype)[chartype] == ucp_Z ||
c == CHAR_HT || c == CHAR_NL || c == CHAR_VT ||
c == CHAR_FF || c == CHAR_CR)
== negated;
case PT_WORD:
return (PRIV(ucp_gentype)[chartype] == ucp_L ||
PRIV(ucp_gentype)[chartype] == ucp_N ||
c == CHAR_UNDERSCORE) == negated;
}
return FALSE;
}
#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:
previous pointer to the repeated opcode
utf TRUE in UTF-8 / UTF-16 mode
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(const pcre_uchar *previous, BOOL utf,
const pcre_uchar *ptr, int options, compile_data *cd)
{
pcre_int32 c, next;
int op_code = *previous++;
/* Skip whitespace and comments in extended mode */
if ((options & PCRE_EXTENDED) != 0)
{
for (;;)
{
while (MAX_255(*ptr) && (cd->ctypes[*ptr] & ctype_space) != 0) ptr++;
if (*ptr == CHAR_NUMBER_SIGN)
{
ptr++;
while (*ptr != 0)
{
if (IS_NEWLINE(ptr)) { ptr += cd->nllen; break; }
ptr++;
#ifdef SUPPORT_UTF
if (utf) FORWARDCHAR(ptr);
#endif
}
}
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 == CHAR_BACKSLASH)
{
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 (!MAX_255(*ptr) || (cd->ctypes[*ptr] & ctype_meta) == 0)
{
#ifdef SUPPORT_UTF
if (utf) { GETCHARINC(next, ptr); } else
#endif
next = *ptr++;
}
else return FALSE;
/* Skip whitespace and comments in extended mode */
if ((options & PCRE_EXTENDED) != 0)
{
for (;;)
{
while (MAX_255(*ptr) && (cd->ctypes[*ptr] & ctype_space) != 0) ptr++;
if (*ptr == CHAR_NUMBER_SIGN)
{
ptr++;
while (*ptr != 0)
{
if (IS_NEWLINE(ptr)) { ptr += cd->nllen; break; }
ptr++;
#ifdef SUPPORT_UTF
if (utf) FORWARDCHAR(ptr);
#endif
}
}
else break;
}
}
/* If the next thing is itself optional, we have to give up. */
if (*ptr == CHAR_ASTERISK || *ptr == CHAR_QUESTION_MARK ||
STRNCMP_UC_C8(ptr, STR_LEFT_CURLY_BRACKET STR_0 STR_COMMA, 3) == 0)
return FALSE;
/* Now compare the next item with the previous opcode. First, handle cases when
the next item is a character. */
if (next >= 0) switch(op_code)
{
case OP_CHAR:
#ifdef SUPPORT_UTF
GETCHARTEST(c, previous);
#else
c = *previous;
#endif
return c != next;
/* For CHARI (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_CHARI:
#ifdef SUPPORT_UTF
GETCHARTEST(c, previous);
#else
c = *previous;
#endif
if (c == next) return FALSE;
#ifdef SUPPORT_UTF
if (utf)
{
unsigned int othercase;
if (next < 128) othercase = cd->fcc[next]; else
#ifdef SUPPORT_UCP
othercase = UCD_OTHERCASE((unsigned int)next);
#else
othercase = NOTACHAR;
#endif
return (unsigned int)c != othercase;
}
else
#endif /* SUPPORT_UTF */
return (c != TABLE_GET((unsigned int)next, cd->fcc, next)); /* Non-UTF-8 mode */
case OP_NOT:
#ifdef SUPPORT_UTF
GETCHARTEST(c, previous);
#else
c = *previous;
#endif
return c == next;
case OP_NOTI:
#ifdef SUPPORT_UTF
GETCHARTEST(c, previous);