| /* display.c -- readline redisplay facility. */ |
| |
| /* Copyright (C) 1987-2009 Free Software Foundation, Inc. |
| |
| This file is part of the GNU Readline Library (Readline), a library |
| for reading lines of text with interactive input and history editing. |
| |
| Readline is free software: you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation, either version 3 of the License, or |
| (at your option) any later version. |
| |
| Readline is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with Readline. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #define READLINE_LIBRARY |
| |
| #if defined (HAVE_CONFIG_H) |
| # include <config.h> |
| #endif |
| |
| #include <sys/types.h> |
| |
| #if defined (HAVE_UNISTD_H) |
| # include <unistd.h> |
| #endif /* HAVE_UNISTD_H */ |
| |
| #include "posixstat.h" |
| |
| #if defined (HAVE_STDLIB_H) |
| # include <stdlib.h> |
| #else |
| # include "ansi_stdlib.h" |
| #endif /* HAVE_STDLIB_H */ |
| |
| #include <stdio.h> |
| |
| #ifdef __MSDOS__ |
| # include <pc.h> |
| #endif |
| |
| /* System-specific feature definitions and include files. */ |
| #include "rldefs.h" |
| #include "rlmbutil.h" |
| |
| /* Termcap library stuff. */ |
| #include "tcap.h" |
| |
| /* Some standard library routines. */ |
| #include "readline.h" |
| #include "history.h" |
| |
| #include "rlprivate.h" |
| #include "xmalloc.h" |
| |
| #if !defined (strchr) && !defined (__STDC__) |
| extern char *strchr (), *strrchr (); |
| #endif /* !strchr && !__STDC__ */ |
| |
| static void update_line PARAMS((char *, char *, int, int, int, int)); |
| static void space_to_eol PARAMS((int)); |
| static void delete_chars PARAMS((int)); |
| static void insert_some_chars PARAMS((char *, int, int)); |
| static void cr PARAMS((void)); |
| |
| /* State of visible and invisible lines. */ |
| struct line_state |
| { |
| char *line; |
| int *lbreaks; |
| int lbsize; |
| #if defined (HANDLE_MULTIBYTE) |
| int *wrapped_line; |
| int wbsize; |
| #endif |
| }; |
| |
| /* The line display buffers. One is the line currently displayed on |
| the screen. The other is the line about to be displayed. */ |
| static struct line_state line_state_array[2]; |
| static struct line_state *line_state_visible = &line_state_array[0]; |
| static struct line_state *line_state_invisible = &line_state_array[1]; |
| static int line_structures_initialized = 0; |
| |
| /* Backwards-compatible names. */ |
| #define inv_lbreaks (line_state_invisible->lbreaks) |
| #define inv_lbsize (line_state_invisible->lbsize) |
| #define vis_lbreaks (line_state_visible->lbreaks) |
| #define vis_lbsize (line_state_visible->lbsize) |
| |
| #define visible_line (line_state_visible->line) |
| #define invisible_line (line_state_invisible->line) |
| |
| #if defined (HANDLE_MULTIBYTE) |
| static int _rl_col_width PARAMS((const char *, int, int, int)); |
| #else |
| # define _rl_col_width(l, s, e, f) (((e) <= (s)) ? 0 : (e) - (s)) |
| #endif |
| |
| /* Heuristic used to decide whether it is faster to move from CUR to NEW |
| by backing up or outputting a carriage return and moving forward. CUR |
| and NEW are either both buffer positions or absolute screen positions. */ |
| #define CR_FASTER(new, cur) (((new) + 1) < ((cur) - (new))) |
| |
| /* _rl_last_c_pos is an absolute cursor position in multibyte locales and a |
| buffer index in others. This macro is used when deciding whether the |
| current cursor position is in the middle of a prompt string containing |
| invisible characters. XXX - might need to take `modmark' into account. */ |
| #define PROMPT_ENDING_INDEX \ |
| ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) ? prompt_physical_chars : prompt_last_invisible+1) |
| |
| |
| /* **************************************************************** */ |
| /* */ |
| /* Display stuff */ |
| /* */ |
| /* **************************************************************** */ |
| |
| /* This is the stuff that is hard for me. I never seem to write good |
| display routines in C. Let's see how I do this time. */ |
| |
| /* (PWP) Well... Good for a simple line updater, but totally ignores |
| the problems of input lines longer than the screen width. |
| |
| update_line and the code that calls it makes a multiple line, |
| automatically wrapping line update. Careful attention needs |
| to be paid to the vertical position variables. */ |
| |
| /* Keep two buffers; one which reflects the current contents of the |
| screen, and the other to draw what we think the new contents should |
| be. Then compare the buffers, and make whatever changes to the |
| screen itself that we should. Finally, make the buffer that we |
| just drew into be the one which reflects the current contents of the |
| screen, and place the cursor where it belongs. |
| |
| Commands that want to can fix the display themselves, and then let |
| this function know that the display has been fixed by setting the |
| RL_DISPLAY_FIXED variable. This is good for efficiency. */ |
| |
| /* Application-specific redisplay function. */ |
| rl_voidfunc_t *rl_redisplay_function = rl_redisplay; |
| |
| /* Global variables declared here. */ |
| /* What YOU turn on when you have handled all redisplay yourself. */ |
| int rl_display_fixed = 0; |
| |
| int _rl_suppress_redisplay = 0; |
| int _rl_want_redisplay = 0; |
| |
| /* The stuff that gets printed out before the actual text of the line. |
| This is usually pointing to rl_prompt. */ |
| char *rl_display_prompt = (char *)NULL; |
| |
| /* Pseudo-global variables declared here. */ |
| |
| /* The visible cursor position. If you print some text, adjust this. */ |
| /* NOTE: _rl_last_c_pos is used as a buffer index when not in a locale |
| supporting multibyte characters, and an absolute cursor position when |
| in such a locale. This is an artifact of the donated multibyte support. |
| Care must be taken when modifying its value. */ |
| int _rl_last_c_pos = 0; |
| int _rl_last_v_pos = 0; |
| |
| static int cpos_adjusted; |
| static int cpos_buffer_position; |
| static int prompt_multibyte_chars; |
| |
| /* Number of lines currently on screen minus 1. */ |
| int _rl_vis_botlin = 0; |
| |
| /* Variables used only in this file. */ |
| /* The last left edge of text that was displayed. This is used when |
| doing horizontal scrolling. It shifts in thirds of a screenwidth. */ |
| static int last_lmargin; |
| |
| /* A buffer for `modeline' messages. */ |
| static char msg_buf[128]; |
| |
| /* Non-zero forces the redisplay even if we thought it was unnecessary. */ |
| static int forced_display; |
| |
| /* Default and initial buffer size. Can grow. */ |
| static int line_size = 1024; |
| |
| /* Variables to keep track of the expanded prompt string, which may |
| include invisible characters. */ |
| |
| static char *local_prompt, *local_prompt_prefix; |
| static int local_prompt_len; |
| static int prompt_visible_length, prompt_prefix_length; |
| |
| /* The number of invisible characters in the line currently being |
| displayed on the screen. */ |
| static int visible_wrap_offset; |
| |
| /* The number of invisible characters in the prompt string. Static so it |
| can be shared between rl_redisplay and update_line */ |
| static int wrap_offset; |
| |
| /* The index of the last invisible character in the prompt string. */ |
| static int prompt_last_invisible; |
| |
| /* The length (buffer offset) of the first line of the last (possibly |
| multi-line) buffer displayed on the screen. */ |
| static int visible_first_line_len; |
| |
| /* Number of invisible characters on the first physical line of the prompt. |
| Only valid when the number of physical characters in the prompt exceeds |
| (or is equal to) _rl_screenwidth. */ |
| static int prompt_invis_chars_first_line; |
| |
| static int prompt_last_screen_line; |
| |
| static int prompt_physical_chars; |
| |
| /* set to a non-zero value by rl_redisplay if we are marking modified history |
| lines and the current line is so marked. */ |
| static int modmark; |
| |
| /* Variables to save and restore prompt and display information. */ |
| |
| /* These are getting numerous enough that it's time to create a struct. */ |
| |
| static char *saved_local_prompt; |
| static char *saved_local_prefix; |
| static int saved_last_invisible; |
| static int saved_visible_length; |
| static int saved_prefix_length; |
| static int saved_local_length; |
| static int saved_invis_chars_first_line; |
| static int saved_physical_chars; |
| |
| /* Expand the prompt string S and return the number of visible |
| characters in *LP, if LP is not null. This is currently more-or-less |
| a placeholder for expansion. LIP, if non-null is a place to store the |
| index of the last invisible character in the returned string. NIFLP, |
| if non-zero, is a place to store the number of invisible characters in |
| the first prompt line. The previous are used as byte counts -- indexes |
| into a character buffer. */ |
| |
| /* Current implementation: |
| \001 (^A) start non-visible characters |
| \002 (^B) end non-visible characters |
| all characters except \001 and \002 (following a \001) are copied to |
| the returned string; all characters except those between \001 and |
| \002 are assumed to be `visible'. */ |
| |
| static char * |
| expand_prompt (pmt, lp, lip, niflp, vlp) |
| char *pmt; |
| int *lp, *lip, *niflp, *vlp; |
| { |
| char *r, *ret, *p, *igstart; |
| int l, rl, last, ignoring, ninvis, invfl, invflset, ind, pind, physchars; |
| |
| /* Short-circuit if we can. */ |
| if ((MB_CUR_MAX <= 1 || rl_byte_oriented) && strchr (pmt, RL_PROMPT_START_IGNORE) == 0) |
| { |
| r = savestring (pmt); |
| if (lp) |
| *lp = strlen (r); |
| if (lip) |
| *lip = 0; |
| if (niflp) |
| *niflp = 0; |
| if (vlp) |
| *vlp = lp ? *lp : strlen (r); |
| return r; |
| } |
| |
| l = strlen (pmt); |
| r = ret = (char *)xmalloc (l + 1); |
| |
| invfl = 0; /* invisible chars in first line of prompt */ |
| invflset = 0; /* we only want to set invfl once */ |
| |
| igstart = 0; |
| for (rl = ignoring = last = ninvis = physchars = 0, p = pmt; p && *p; p++) |
| { |
| /* This code strips the invisible character string markers |
| RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE */ |
| if (ignoring == 0 && *p == RL_PROMPT_START_IGNORE) /* XXX - check ignoring? */ |
| { |
| ignoring = 1; |
| igstart = p; |
| continue; |
| } |
| else if (ignoring && *p == RL_PROMPT_END_IGNORE) |
| { |
| ignoring = 0; |
| if (p != (igstart + 1)) |
| last = r - ret - 1; |
| continue; |
| } |
| else |
| { |
| #if defined (HANDLE_MULTIBYTE) |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| { |
| pind = p - pmt; |
| ind = _rl_find_next_mbchar (pmt, pind, 1, MB_FIND_NONZERO); |
| l = ind - pind; |
| while (l--) |
| *r++ = *p++; |
| if (!ignoring) |
| { |
| /* rl ends up being assigned to prompt_visible_length, |
| which is the number of characters in the buffer that |
| contribute to characters on the screen, which might |
| not be the same as the number of physical characters |
| on the screen in the presence of multibyte characters */ |
| rl += ind - pind; |
| physchars += _rl_col_width (pmt, pind, ind, 0); |
| } |
| else |
| ninvis += ind - pind; |
| p--; /* compensate for later increment */ |
| } |
| else |
| #endif |
| { |
| *r++ = *p; |
| if (!ignoring) |
| { |
| rl++; /* visible length byte counter */ |
| physchars++; |
| } |
| else |
| ninvis++; /* invisible chars byte counter */ |
| } |
| |
| if (invflset == 0 && rl >= _rl_screenwidth) |
| { |
| invfl = ninvis; |
| invflset = 1; |
| } |
| } |
| } |
| |
| if (rl < _rl_screenwidth) |
| invfl = ninvis; |
| |
| *r = '\0'; |
| if (lp) |
| *lp = rl; |
| if (lip) |
| *lip = last; |
| if (niflp) |
| *niflp = invfl; |
| if (vlp) |
| *vlp = physchars; |
| return ret; |
| } |
| |
| /* Just strip out RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE from |
| PMT and return the rest of PMT. */ |
| char * |
| _rl_strip_prompt (pmt) |
| char *pmt; |
| { |
| char *ret; |
| |
| ret = expand_prompt (pmt, (int *)NULL, (int *)NULL, (int *)NULL, (int *)NULL); |
| return ret; |
| } |
| |
| /* |
| * Expand the prompt string into the various display components, if |
| * necessary. |
| * |
| * local_prompt = expanded last line of string in rl_display_prompt |
| * (portion after the final newline) |
| * local_prompt_prefix = portion before last newline of rl_display_prompt, |
| * expanded via expand_prompt |
| * prompt_visible_length = number of visible characters in local_prompt |
| * prompt_prefix_length = number of visible characters in local_prompt_prefix |
| * |
| * This function is called once per call to readline(). It may also be |
| * called arbitrarily to expand the primary prompt. |
| * |
| * The return value is the number of visible characters on the last line |
| * of the (possibly multi-line) prompt. |
| */ |
| int |
| rl_expand_prompt (prompt) |
| char *prompt; |
| { |
| char *p, *t; |
| int c; |
| |
| /* Clear out any saved values. */ |
| FREE (local_prompt); |
| FREE (local_prompt_prefix); |
| |
| local_prompt = local_prompt_prefix = (char *)0; |
| local_prompt_len = 0; |
| prompt_last_invisible = prompt_invis_chars_first_line = 0; |
| prompt_visible_length = prompt_physical_chars = 0; |
| |
| if (prompt == 0 || *prompt == 0) |
| return (0); |
| |
| p = strrchr (prompt, '\n'); |
| if (!p) |
| { |
| /* The prompt is only one logical line, though it might wrap. */ |
| local_prompt = expand_prompt (prompt, &prompt_visible_length, |
| &prompt_last_invisible, |
| &prompt_invis_chars_first_line, |
| &prompt_physical_chars); |
| local_prompt_prefix = (char *)0; |
| local_prompt_len = local_prompt ? strlen (local_prompt) : 0; |
| return (prompt_visible_length); |
| } |
| else |
| { |
| /* The prompt spans multiple lines. */ |
| t = ++p; |
| local_prompt = expand_prompt (p, &prompt_visible_length, |
| &prompt_last_invisible, |
| &prompt_invis_chars_first_line, |
| &prompt_physical_chars); |
| c = *t; *t = '\0'; |
| /* The portion of the prompt string up to and including the |
| final newline is now null-terminated. */ |
| local_prompt_prefix = expand_prompt (prompt, &prompt_prefix_length, |
| (int *)NULL, |
| (int *)NULL, |
| (int *)NULL); |
| *t = c; |
| local_prompt_len = local_prompt ? strlen (local_prompt) : 0; |
| return (prompt_prefix_length); |
| } |
| } |
| |
| /* Initialize the VISIBLE_LINE and INVISIBLE_LINE arrays, and their associated |
| arrays of line break markers. MINSIZE is the minimum size of VISIBLE_LINE |
| and INVISIBLE_LINE; if it is greater than LINE_SIZE, LINE_SIZE is |
| increased. If the lines have already been allocated, this ensures that |
| they can hold at least MINSIZE characters. */ |
| static void |
| init_line_structures (minsize) |
| int minsize; |
| { |
| register int n; |
| |
| if (invisible_line == 0) /* initialize it */ |
| { |
| if (line_size < minsize) |
| line_size = minsize; |
| visible_line = (char *)xmalloc (line_size); |
| invisible_line = (char *)xmalloc (line_size); |
| } |
| else if (line_size < minsize) /* ensure it can hold MINSIZE chars */ |
| { |
| line_size *= 2; |
| if (line_size < minsize) |
| line_size = minsize; |
| visible_line = (char *)xrealloc (visible_line, line_size); |
| invisible_line = (char *)xrealloc (invisible_line, line_size); |
| } |
| |
| for (n = minsize; n < line_size; n++) |
| { |
| visible_line[n] = 0; |
| invisible_line[n] = 1; |
| } |
| |
| if (vis_lbreaks == 0) |
| { |
| /* should be enough. */ |
| inv_lbsize = vis_lbsize = 256; |
| |
| #if defined (HANDLE_MULTIBYTE) |
| line_state_visible->wbsize = vis_lbsize; |
| line_state_visible->wrapped_line = (int *)xmalloc (line_state_visible->wbsize * sizeof (int)); |
| |
| line_state_invisible->wbsize = inv_lbsize; |
| line_state_invisible->wrapped_line = (int *)xmalloc (line_state_invisible->wbsize * sizeof (int)); |
| #endif |
| |
| inv_lbreaks = (int *)xmalloc (inv_lbsize * sizeof (int)); |
| vis_lbreaks = (int *)xmalloc (vis_lbsize * sizeof (int)); |
| inv_lbreaks[0] = vis_lbreaks[0] = 0; |
| } |
| |
| line_structures_initialized = 1; |
| } |
| |
| /* Basic redisplay algorithm. */ |
| void |
| rl_redisplay () |
| { |
| register int in, out, c, linenum, cursor_linenum; |
| register char *line; |
| int inv_botlin, lb_botlin, lb_linenum, o_cpos; |
| int newlines, lpos, temp, n0, num, prompt_lines_estimate; |
| char *prompt_this_line; |
| #if defined (HANDLE_MULTIBYTE) |
| wchar_t wc; |
| size_t wc_bytes; |
| int wc_width; |
| mbstate_t ps; |
| int _rl_wrapped_multicolumn = 0; |
| #endif |
| |
| if (_rl_echoing_p == 0) |
| return; |
| |
| /* Block keyboard interrupts because this function manipulates global |
| data structures. */ |
| _rl_block_sigint (); |
| RL_SETSTATE (RL_STATE_REDISPLAYING); |
| |
| if (!rl_display_prompt) |
| rl_display_prompt = ""; |
| |
| if (line_structures_initialized == 0) |
| { |
| init_line_structures (0); |
| rl_on_new_line (); |
| } |
| |
| /* Draw the line into the buffer. */ |
| cpos_buffer_position = -1; |
| |
| prompt_multibyte_chars = prompt_visible_length - prompt_physical_chars; |
| |
| line = invisible_line; |
| out = inv_botlin = 0; |
| |
| /* Mark the line as modified or not. We only do this for history |
| lines. */ |
| modmark = 0; |
| if (_rl_mark_modified_lines && current_history () && rl_undo_list) |
| { |
| line[out++] = '*'; |
| line[out] = '\0'; |
| modmark = 1; |
| } |
| |
| /* If someone thought that the redisplay was handled, but the currently |
| visible line has a different modification state than the one about |
| to become visible, then correct the caller's misconception. */ |
| if (visible_line[0] != invisible_line[0]) |
| rl_display_fixed = 0; |
| |
| /* If the prompt to be displayed is the `primary' readline prompt (the |
| one passed to readline()), use the values we have already expanded. |
| If not, use what's already in rl_display_prompt. WRAP_OFFSET is the |
| number of non-visible characters in the prompt string. */ |
| if (rl_display_prompt == rl_prompt || local_prompt) |
| { |
| if (local_prompt_prefix && forced_display) |
| _rl_output_some_chars (local_prompt_prefix, strlen (local_prompt_prefix)); |
| |
| if (local_prompt_len > 0) |
| { |
| temp = local_prompt_len + out + 2; |
| if (temp >= line_size) |
| { |
| line_size = (temp + 1024) - (temp % 1024); |
| visible_line = (char *)xrealloc (visible_line, line_size); |
| line = invisible_line = (char *)xrealloc (invisible_line, line_size); |
| } |
| strncpy (line + out, local_prompt, local_prompt_len); |
| out += local_prompt_len; |
| } |
| line[out] = '\0'; |
| wrap_offset = local_prompt_len - prompt_visible_length; |
| } |
| else |
| { |
| int pmtlen; |
| prompt_this_line = strrchr (rl_display_prompt, '\n'); |
| if (!prompt_this_line) |
| prompt_this_line = rl_display_prompt; |
| else |
| { |
| prompt_this_line++; |
| pmtlen = prompt_this_line - rl_display_prompt; /* temp var */ |
| if (forced_display) |
| { |
| _rl_output_some_chars (rl_display_prompt, pmtlen); |
| /* Make sure we are at column zero even after a newline, |
| regardless of the state of terminal output processing. */ |
| if (pmtlen < 2 || prompt_this_line[-2] != '\r') |
| cr (); |
| } |
| } |
| |
| prompt_physical_chars = pmtlen = strlen (prompt_this_line); |
| temp = pmtlen + out + 2; |
| if (temp >= line_size) |
| { |
| line_size = (temp + 1024) - (temp % 1024); |
| visible_line = (char *)xrealloc (visible_line, line_size); |
| line = invisible_line = (char *)xrealloc (invisible_line, line_size); |
| } |
| strncpy (line + out, prompt_this_line, pmtlen); |
| out += pmtlen; |
| line[out] = '\0'; |
| wrap_offset = prompt_invis_chars_first_line = 0; |
| } |
| |
| #define CHECK_INV_LBREAKS() \ |
| do { \ |
| if (newlines >= (inv_lbsize - 2)) \ |
| { \ |
| inv_lbsize *= 2; \ |
| inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \ |
| } \ |
| } while (0) |
| |
| #if defined (HANDLE_MULTIBYTE) |
| #define CHECK_LPOS() \ |
| do { \ |
| lpos++; \ |
| if (lpos >= _rl_screenwidth) \ |
| { \ |
| if (newlines >= (inv_lbsize - 2)) \ |
| { \ |
| inv_lbsize *= 2; \ |
| inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \ |
| } \ |
| inv_lbreaks[++newlines] = out; \ |
| if (newlines >= (line_state_invisible->wbsize - 1)) \ |
| { \ |
| line_state_invisible->wbsize *= 2; \ |
| line_state_invisible->wrapped_line = (int *)xrealloc (line_state_invisible->wrapped_line, line_state_invisible->wbsize * sizeof(int)); \ |
| } \ |
| line_state_invisible->wrapped_line[newlines] = _rl_wrapped_multicolumn; \ |
| lpos = 0; \ |
| } \ |
| } while (0) |
| #else |
| #define CHECK_LPOS() \ |
| do { \ |
| lpos++; \ |
| if (lpos >= _rl_screenwidth) \ |
| { \ |
| if (newlines >= (inv_lbsize - 2)) \ |
| { \ |
| inv_lbsize *= 2; \ |
| inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \ |
| } \ |
| inv_lbreaks[++newlines] = out; \ |
| lpos = 0; \ |
| } \ |
| } while (0) |
| #endif |
| |
| /* inv_lbreaks[i] is where line i starts in the buffer. */ |
| inv_lbreaks[newlines = 0] = 0; |
| lpos = prompt_physical_chars + modmark; |
| |
| #if defined (HANDLE_MULTIBYTE) |
| memset (line_state_invisible->wrapped_line, 0, line_state_invisible->wbsize * sizeof (int)); |
| num = 0; |
| #endif |
| |
| /* prompt_invis_chars_first_line is the number of invisible characters in |
| the first physical line of the prompt. |
| wrap_offset - prompt_invis_chars_first_line is the number of invis |
| chars on the second (or, more generally, last) line. */ |
| |
| /* This is zero-based, used to set the newlines */ |
| prompt_lines_estimate = lpos / _rl_screenwidth; |
| |
| /* what if lpos is already >= _rl_screenwidth before we start drawing the |
| contents of the command line? */ |
| while (lpos >= _rl_screenwidth) |
| { |
| int z; |
| /* fix from Darin Johnson <darin@acuson.com> for prompt string with |
| invisible characters that is longer than the screen width. The |
| prompt_invis_chars_first_line variable could be made into an array |
| saying how many invisible characters there are per line, but that's |
| probably too much work for the benefit gained. How many people have |
| prompts that exceed two physical lines? |
| Additional logic fix from Edward Catmur <ed@catmur.co.uk> */ |
| #if defined (HANDLE_MULTIBYTE) |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0 && prompt_multibyte_chars > 0) |
| { |
| n0 = num; |
| temp = local_prompt_len; |
| while (num < temp) |
| { |
| z = _rl_col_width (local_prompt, n0, num, 1); |
| if (z > _rl_screenwidth) |
| { |
| num = _rl_find_prev_mbchar (local_prompt, num, MB_FIND_ANY); |
| break; |
| } |
| else if (z == _rl_screenwidth) |
| break; |
| num++; |
| } |
| temp = num; |
| } |
| else |
| #endif /* !HANDLE_MULTIBYTE */ |
| temp = ((newlines + 1) * _rl_screenwidth); |
| |
| /* Now account for invisible characters in the current line. */ |
| /* XXX - this assumes that the invisible characters may be split, but only |
| between the first and the last lines. */ |
| temp += ((local_prompt_prefix == 0) ? ((newlines == 0) ? prompt_invis_chars_first_line |
| : ((newlines == prompt_lines_estimate) ? wrap_offset : prompt_invis_chars_first_line)) |
| : ((newlines == 0) ? wrap_offset : 0)); |
| |
| inv_lbreaks[++newlines] = temp; |
| #if defined (HANDLE_MULTIBYTE) |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0 && prompt_multibyte_chars > 0) |
| lpos -= _rl_col_width (local_prompt, n0, num, 1); |
| else |
| #endif |
| lpos -= _rl_screenwidth; |
| } |
| |
| prompt_last_screen_line = newlines; |
| |
| /* Draw the rest of the line (after the prompt) into invisible_line, keeping |
| track of where the cursor is (cpos_buffer_position), the number of the line containing |
| the cursor (lb_linenum), the last line number (lb_botlin and inv_botlin). |
| It maintains an array of line breaks for display (inv_lbreaks). |
| This handles expanding tabs for display and displaying meta characters. */ |
| lb_linenum = 0; |
| #if defined (HANDLE_MULTIBYTE) |
| in = 0; |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| { |
| memset (&ps, 0, sizeof (mbstate_t)); |
| /* XXX - what if wc_bytes ends up <= 0? check for MB_INVALIDCH */ |
| wc_bytes = mbrtowc (&wc, rl_line_buffer, rl_end, &ps); |
| } |
| else |
| wc_bytes = 1; |
| while (in < rl_end) |
| #else |
| for (in = 0; in < rl_end; in++) |
| #endif |
| { |
| c = (unsigned char)rl_line_buffer[in]; |
| |
| #if defined (HANDLE_MULTIBYTE) |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| { |
| if (MB_INVALIDCH (wc_bytes)) |
| { |
| /* Byte sequence is invalid or shortened. Assume that the |
| first byte represents a character. */ |
| wc_bytes = 1; |
| /* Assume that a character occupies a single column. */ |
| wc_width = 1; |
| memset (&ps, 0, sizeof (mbstate_t)); |
| } |
| else if (MB_NULLWCH (wc_bytes)) |
| break; /* Found '\0' */ |
| else |
| { |
| temp = wcwidth (wc); |
| wc_width = (temp >= 0) ? temp : 1; |
| } |
| } |
| #endif |
| |
| if (out + 8 >= line_size) /* XXX - 8 for \t */ |
| { |
| line_size *= 2; |
| visible_line = (char *)xrealloc (visible_line, line_size); |
| invisible_line = (char *)xrealloc (invisible_line, line_size); |
| line = invisible_line; |
| } |
| |
| if (in == rl_point) |
| { |
| cpos_buffer_position = out; |
| lb_linenum = newlines; |
| } |
| |
| #if defined (HANDLE_MULTIBYTE) |
| if (META_CHAR (c) && _rl_output_meta_chars == 0) /* XXX - clean up */ |
| #else |
| if (META_CHAR (c)) |
| #endif |
| { |
| if (_rl_output_meta_chars == 0) |
| { |
| sprintf (line + out, "\\%o", c); |
| |
| if (lpos + 4 >= _rl_screenwidth) |
| { |
| temp = _rl_screenwidth - lpos; |
| CHECK_INV_LBREAKS (); |
| inv_lbreaks[++newlines] = out + temp; |
| lpos = 4 - temp; |
| } |
| else |
| lpos += 4; |
| |
| out += 4; |
| } |
| else |
| { |
| line[out++] = c; |
| CHECK_LPOS(); |
| } |
| } |
| #if defined (DISPLAY_TABS) |
| else if (c == '\t') |
| { |
| register int newout; |
| |
| #if 0 |
| newout = (out | (int)7) + 1; |
| #else |
| newout = out + 8 - lpos % 8; |
| #endif |
| temp = newout - out; |
| if (lpos + temp >= _rl_screenwidth) |
| { |
| register int temp2; |
| temp2 = _rl_screenwidth - lpos; |
| CHECK_INV_LBREAKS (); |
| inv_lbreaks[++newlines] = out + temp2; |
| lpos = temp - temp2; |
| while (out < newout) |
| line[out++] = ' '; |
| } |
| else |
| { |
| while (out < newout) |
| line[out++] = ' '; |
| lpos += temp; |
| } |
| } |
| #endif |
| else if (c == '\n' && _rl_horizontal_scroll_mode == 0 && _rl_term_up && *_rl_term_up) |
| { |
| line[out++] = '\0'; /* XXX - sentinel */ |
| CHECK_INV_LBREAKS (); |
| inv_lbreaks[++newlines] = out; |
| lpos = 0; |
| } |
| else if (CTRL_CHAR (c) || c == RUBOUT) |
| { |
| line[out++] = '^'; |
| CHECK_LPOS(); |
| line[out++] = CTRL_CHAR (c) ? UNCTRL (c) : '?'; |
| CHECK_LPOS(); |
| } |
| else |
| { |
| #if defined (HANDLE_MULTIBYTE) |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| { |
| register int i; |
| |
| _rl_wrapped_multicolumn = 0; |
| |
| if (_rl_screenwidth < lpos + wc_width) |
| for (i = lpos; i < _rl_screenwidth; i++) |
| { |
| /* The space will be removed in update_line() */ |
| line[out++] = ' '; |
| _rl_wrapped_multicolumn++; |
| CHECK_LPOS(); |
| } |
| if (in == rl_point) |
| { |
| cpos_buffer_position = out; |
| lb_linenum = newlines; |
| } |
| for (i = in; i < in+wc_bytes; i++) |
| line[out++] = rl_line_buffer[i]; |
| for (i = 0; i < wc_width; i++) |
| CHECK_LPOS(); |
| } |
| else |
| { |
| line[out++] = c; |
| CHECK_LPOS(); |
| } |
| #else |
| line[out++] = c; |
| CHECK_LPOS(); |
| #endif |
| } |
| |
| #if defined (HANDLE_MULTIBYTE) |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| { |
| in += wc_bytes; |
| /* XXX - what if wc_bytes ends up <= 0? check for MB_INVALIDCH */ |
| wc_bytes = mbrtowc (&wc, rl_line_buffer + in, rl_end - in, &ps); |
| } |
| else |
| in++; |
| #endif |
| |
| } |
| line[out] = '\0'; |
| if (cpos_buffer_position < 0) |
| { |
| cpos_buffer_position = out; |
| lb_linenum = newlines; |
| } |
| |
| inv_botlin = lb_botlin = newlines; |
| CHECK_INV_LBREAKS (); |
| inv_lbreaks[newlines+1] = out; |
| cursor_linenum = lb_linenum; |
| |
| /* CPOS_BUFFER_POSITION == position in buffer where cursor should be placed. |
| CURSOR_LINENUM == line number where the cursor should be placed. */ |
| |
| /* PWP: now is when things get a bit hairy. The visible and invisible |
| line buffers are really multiple lines, which would wrap every |
| (screenwidth - 1) characters. Go through each in turn, finding |
| the changed region and updating it. The line order is top to bottom. */ |
| |
| /* If we can move the cursor up and down, then use multiple lines, |
| otherwise, let long lines display in a single terminal line, and |
| horizontally scroll it. */ |
| |
| if (_rl_horizontal_scroll_mode == 0 && _rl_term_up && *_rl_term_up) |
| { |
| int nleft, pos, changed_screen_line, tx; |
| |
| if (!rl_display_fixed || forced_display) |
| { |
| forced_display = 0; |
| |
| /* If we have more than a screenful of material to display, then |
| only display a screenful. We should display the last screen, |
| not the first. */ |
| if (out >= _rl_screenchars) |
| { |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| out = _rl_find_prev_mbchar (line, _rl_screenchars, MB_FIND_ANY); |
| else |
| out = _rl_screenchars - 1; |
| } |
| |
| /* The first line is at character position 0 in the buffer. The |
| second and subsequent lines start at inv_lbreaks[N], offset by |
| OFFSET (which has already been calculated above). */ |
| |
| #define INVIS_FIRST() (prompt_physical_chars > _rl_screenwidth ? prompt_invis_chars_first_line : wrap_offset) |
| #define WRAP_OFFSET(line, offset) ((line == 0) \ |
| ? (offset ? INVIS_FIRST() : 0) \ |
| : ((line == prompt_last_screen_line) ? wrap_offset-prompt_invis_chars_first_line : 0)) |
| #define W_OFFSET(line, offset) ((line) == 0 ? offset : 0) |
| #define VIS_LLEN(l) ((l) > _rl_vis_botlin ? 0 : (vis_lbreaks[l+1] - vis_lbreaks[l])) |
| #define INV_LLEN(l) (inv_lbreaks[l+1] - inv_lbreaks[l]) |
| #define VIS_CHARS(line) (visible_line + vis_lbreaks[line]) |
| #define VIS_LINE(line) ((line) > _rl_vis_botlin) ? "" : VIS_CHARS(line) |
| #define INV_LINE(line) (invisible_line + inv_lbreaks[line]) |
| |
| #define OLD_CPOS_IN_PROMPT() (cpos_adjusted == 0 && \ |
| _rl_last_c_pos != o_cpos && \ |
| _rl_last_c_pos > wrap_offset && \ |
| o_cpos < prompt_last_invisible) |
| |
| /* For each line in the buffer, do the updating display. */ |
| for (linenum = 0; linenum <= inv_botlin; linenum++) |
| { |
| /* This can lead us astray if we execute a program that changes |
| the locale from a non-multibyte to a multibyte one. */ |
| o_cpos = _rl_last_c_pos; |
| cpos_adjusted = 0; |
| update_line (VIS_LINE(linenum), INV_LINE(linenum), linenum, |
| VIS_LLEN(linenum), INV_LLEN(linenum), inv_botlin); |
| |
| /* update_line potentially changes _rl_last_c_pos, but doesn't |
| take invisible characters into account, since _rl_last_c_pos |
| is an absolute cursor position in a multibyte locale. See |
| if compensating here is the right thing, or if we have to |
| change update_line itself. There are several cases in which |
| update_line adjusts _rl_last_c_pos itself (so it can pass |
| _rl_move_cursor_relative accurate values); it communicates |
| this back by setting cpos_adjusted. If we assume that |
| _rl_last_c_pos is correct (an absolute cursor position) each |
| time update_line is called, then we can assume in our |
| calculations that o_cpos does not need to be adjusted by |
| wrap_offset. */ |
| if (linenum == 0 && (MB_CUR_MAX > 1 && rl_byte_oriented == 0) && OLD_CPOS_IN_PROMPT()) |
| _rl_last_c_pos -= prompt_invis_chars_first_line; /* XXX - was wrap_offset */ |
| else if (linenum == prompt_last_screen_line && prompt_physical_chars > _rl_screenwidth && |
| (MB_CUR_MAX > 1 && rl_byte_oriented == 0) && |
| cpos_adjusted == 0 && |
| _rl_last_c_pos != o_cpos && |
| _rl_last_c_pos > (prompt_last_invisible - _rl_screenwidth - prompt_invis_chars_first_line)) |
| _rl_last_c_pos -= (wrap_offset-prompt_invis_chars_first_line); |
| |
| /* If this is the line with the prompt, we might need to |
| compensate for invisible characters in the new line. Do |
| this only if there is not more than one new line (which |
| implies that we completely overwrite the old visible line) |
| and the new line is shorter than the old. Make sure we are |
| at the end of the new line before clearing. */ |
| if (linenum == 0 && |
| inv_botlin == 0 && _rl_last_c_pos == out && |
| (wrap_offset > visible_wrap_offset) && |
| (_rl_last_c_pos < visible_first_line_len)) |
| { |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| nleft = _rl_screenwidth - _rl_last_c_pos; |
| else |
| nleft = _rl_screenwidth + wrap_offset - _rl_last_c_pos; |
| if (nleft) |
| _rl_clear_to_eol (nleft); |
| } |
| #if 0 |
| /* This segment is intended to handle the case where the prompt |
| has invisible characters on the second line and the new line |
| to be displayed needs to clear the rest of the old characters |
| out (e.g., when printing the i-search prompt). In general, |
| the case of the new line being shorter than the old. |
| Incomplete */ |
| else if (linenum == prompt_last_screen_line && |
| prompt_physical_chars > _rl_screenwidth && |
| wrap_offset != prompt_invis_chars_first_line && |
| _rl_last_c_pos == out && |
| #endif |
| |
| |
| /* Since the new first line is now visible, save its length. */ |
| if (linenum == 0) |
| visible_first_line_len = (inv_botlin > 0) ? inv_lbreaks[1] : out - wrap_offset; |
| } |
| |
| /* We may have deleted some lines. If so, clear the left over |
| blank ones at the bottom out. */ |
| if (_rl_vis_botlin > inv_botlin) |
| { |
| char *tt; |
| for (; linenum <= _rl_vis_botlin; linenum++) |
| { |
| tt = VIS_CHARS (linenum); |
| _rl_move_vert (linenum); |
| _rl_move_cursor_relative (0, tt); |
| _rl_clear_to_eol |
| ((linenum == _rl_vis_botlin) ? strlen (tt) : _rl_screenwidth); |
| } |
| } |
| _rl_vis_botlin = inv_botlin; |
| |
| /* CHANGED_SCREEN_LINE is set to 1 if we have moved to a |
| different screen line during this redisplay. */ |
| changed_screen_line = _rl_last_v_pos != cursor_linenum; |
| if (changed_screen_line) |
| { |
| _rl_move_vert (cursor_linenum); |
| /* If we moved up to the line with the prompt using _rl_term_up, |
| the physical cursor position on the screen stays the same, |
| but the buffer position needs to be adjusted to account |
| for invisible characters. */ |
| if ((MB_CUR_MAX == 1 || rl_byte_oriented) && cursor_linenum == 0 && wrap_offset) |
| _rl_last_c_pos += wrap_offset; |
| } |
| |
| /* We have to reprint the prompt if it contains invisible |
| characters, since it's not generally OK to just reprint |
| the characters from the current cursor position. But we |
| only need to reprint it if the cursor is before the last |
| invisible character in the prompt string. */ |
| nleft = prompt_visible_length + wrap_offset; |
| if (cursor_linenum == 0 && wrap_offset > 0 && _rl_last_c_pos > 0 && |
| #if 0 |
| _rl_last_c_pos <= PROMPT_ENDING_INDEX && local_prompt) |
| #else |
| _rl_last_c_pos < PROMPT_ENDING_INDEX && local_prompt) |
| #endif |
| { |
| #if defined (__MSDOS__) |
| putc ('\r', rl_outstream); |
| #else |
| if (_rl_term_cr) |
| tputs (_rl_term_cr, 1, _rl_output_character_function); |
| #endif |
| if (modmark) |
| _rl_output_some_chars ("*", 1); |
| |
| _rl_output_some_chars (local_prompt, nleft); |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| _rl_last_c_pos = _rl_col_width (local_prompt, 0, nleft, 1) - wrap_offset + modmark; |
| else |
| _rl_last_c_pos = nleft + modmark; |
| } |
| |
| /* Where on that line? And where does that line start |
| in the buffer? */ |
| pos = inv_lbreaks[cursor_linenum]; |
| /* nleft == number of characters in the line buffer between the |
| start of the line and the desired cursor position. */ |
| nleft = cpos_buffer_position - pos; |
| |
| /* NLEFT is now a number of characters in a buffer. When in a |
| multibyte locale, however, _rl_last_c_pos is an absolute cursor |
| position that doesn't take invisible characters in the prompt |
| into account. We use a fudge factor to compensate. */ |
| |
| /* Since _rl_backspace() doesn't know about invisible characters in the |
| prompt, and there's no good way to tell it, we compensate for |
| those characters here and call _rl_backspace() directly. */ |
| if (wrap_offset && cursor_linenum == 0 && nleft < _rl_last_c_pos) |
| { |
| /* TX == new physical cursor position in multibyte locale. */ |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| tx = _rl_col_width (&visible_line[pos], 0, nleft, 1) - visible_wrap_offset; |
| else |
| tx = nleft; |
| if (tx >= 0 && _rl_last_c_pos > tx) |
| { |
| _rl_backspace (_rl_last_c_pos - tx); /* XXX */ |
| _rl_last_c_pos = tx; |
| } |
| } |
| |
| /* We need to note that in a multibyte locale we are dealing with |
| _rl_last_c_pos as an absolute cursor position, but moving to a |
| point specified by a buffer position (NLEFT) that doesn't take |
| invisible characters into account. */ |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| _rl_move_cursor_relative (nleft, &invisible_line[pos]); |
| else if (nleft != _rl_last_c_pos) |
| _rl_move_cursor_relative (nleft, &invisible_line[pos]); |
| } |
| } |
| else /* Do horizontal scrolling. */ |
| { |
| #define M_OFFSET(margin, offset) ((margin) == 0 ? offset : 0) |
| int lmargin, ndisp, nleft, phys_c_pos, t; |
| |
| /* Always at top line. */ |
| _rl_last_v_pos = 0; |
| |
| /* Compute where in the buffer the displayed line should start. This |
| will be LMARGIN. */ |
| |
| /* The number of characters that will be displayed before the cursor. */ |
| ndisp = cpos_buffer_position - wrap_offset; |
| nleft = prompt_visible_length + wrap_offset; |
| /* Where the new cursor position will be on the screen. This can be |
| longer than SCREENWIDTH; if it is, lmargin will be adjusted. */ |
| phys_c_pos = cpos_buffer_position - (last_lmargin ? last_lmargin : wrap_offset); |
| t = _rl_screenwidth / 3; |
| |
| /* If the number of characters had already exceeded the screenwidth, |
| last_lmargin will be > 0. */ |
| |
| /* If the number of characters to be displayed is more than the screen |
| width, compute the starting offset so that the cursor is about |
| two-thirds of the way across the screen. */ |
| if (phys_c_pos > _rl_screenwidth - 2) |
| { |
| lmargin = cpos_buffer_position - (2 * t); |
| if (lmargin < 0) |
| lmargin = 0; |
| /* If the left margin would be in the middle of a prompt with |
| invisible characters, don't display the prompt at all. */ |
| if (wrap_offset && lmargin > 0 && lmargin < nleft) |
| lmargin = nleft; |
| } |
| else if (ndisp < _rl_screenwidth - 2) /* XXX - was -1 */ |
| lmargin = 0; |
| else if (phys_c_pos < 1) |
| { |
| /* If we are moving back towards the beginning of the line and |
| the last margin is no longer correct, compute a new one. */ |
| lmargin = ((cpos_buffer_position - 1) / t) * t; /* XXX */ |
| if (wrap_offset && lmargin > 0 && lmargin < nleft) |
| lmargin = nleft; |
| } |
| else |
| lmargin = last_lmargin; |
| |
| /* If the first character on the screen isn't the first character |
| in the display line, indicate this with a special character. */ |
| if (lmargin > 0) |
| line[lmargin] = '<'; |
| |
| /* If SCREENWIDTH characters starting at LMARGIN do not encompass |
| the whole line, indicate that with a special character at the |
| right edge of the screen. If LMARGIN is 0, we need to take the |
| wrap offset into account. */ |
| t = lmargin + M_OFFSET (lmargin, wrap_offset) + _rl_screenwidth; |
| if (t < out) |
| line[t - 1] = '>'; |
| |
| if (rl_display_fixed == 0 || forced_display || lmargin != last_lmargin) |
| { |
| forced_display = 0; |
| o_cpos = _rl_last_c_pos; |
| cpos_adjusted = 0; |
| update_line (&visible_line[last_lmargin], |
| &invisible_line[lmargin], |
| 0, |
| _rl_screenwidth + visible_wrap_offset, |
| _rl_screenwidth + (lmargin ? 0 : wrap_offset), |
| 0); |
| |
| if ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) && OLD_CPOS_IN_PROMPT()) |
| _rl_last_c_pos -= prompt_invis_chars_first_line; /* XXX - was wrap_offset */ |
| |
| /* If the visible new line is shorter than the old, but the number |
| of invisible characters is greater, and we are at the end of |
| the new line, we need to clear to eol. */ |
| t = _rl_last_c_pos - M_OFFSET (lmargin, wrap_offset); |
| if ((M_OFFSET (lmargin, wrap_offset) > visible_wrap_offset) && |
| (_rl_last_c_pos == out) && |
| t < visible_first_line_len) |
| { |
| nleft = _rl_screenwidth - t; |
| _rl_clear_to_eol (nleft); |
| } |
| visible_first_line_len = out - lmargin - M_OFFSET (lmargin, wrap_offset); |
| if (visible_first_line_len > _rl_screenwidth) |
| visible_first_line_len = _rl_screenwidth; |
| |
| _rl_move_cursor_relative (cpos_buffer_position - lmargin, &invisible_line[lmargin]); |
| last_lmargin = lmargin; |
| } |
| } |
| fflush (rl_outstream); |
| |
| /* Swap visible and non-visible lines. */ |
| { |
| struct line_state *vtemp = line_state_visible; |
| |
| line_state_visible = line_state_invisible; |
| line_state_invisible = vtemp; |
| |
| rl_display_fixed = 0; |
| /* If we are displaying on a single line, and last_lmargin is > 0, we |
| are not displaying any invisible characters, so set visible_wrap_offset |
| to 0. */ |
| if (_rl_horizontal_scroll_mode && last_lmargin) |
| visible_wrap_offset = 0; |
| else |
| visible_wrap_offset = wrap_offset; |
| } |
| |
| RL_UNSETSTATE (RL_STATE_REDISPLAYING); |
| _rl_release_sigint (); |
| } |
| |
| /* PWP: update_line() is based on finding the middle difference of each |
| line on the screen; vis: |
| |
| /old first difference |
| /beginning of line | /old last same /old EOL |
| v v v v |
| old: eddie> Oh, my little gruntle-buggy is to me, as lurgid as |
| new: eddie> Oh, my little buggy says to me, as lurgid as |
| ^ ^ ^ ^ |
| \beginning of line | \new last same \new end of line |
| \new first difference |
| |
| All are character pointers for the sake of speed. Special cases for |
| no differences, as well as for end of line additions must be handled. |
| |
| Could be made even smarter, but this works well enough */ |
| static void |
| update_line (old, new, current_line, omax, nmax, inv_botlin) |
| register char *old, *new; |
| int current_line, omax, nmax, inv_botlin; |
| { |
| register char *ofd, *ols, *oe, *nfd, *nls, *ne; |
| int temp, lendiff, wsatend, od, nd, twidth, o_cpos; |
| int current_invis_chars; |
| int col_lendiff, col_temp; |
| #if defined (HANDLE_MULTIBYTE) |
| mbstate_t ps_new, ps_old; |
| int new_offset, old_offset; |
| #endif |
| |
| /* If we're at the right edge of a terminal that supports xn, we're |
| ready to wrap around, so do so. This fixes problems with knowing |
| the exact cursor position and cut-and-paste with certain terminal |
| emulators. In this calculation, TEMP is the physical screen |
| position of the cursor. */ |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| temp = _rl_last_c_pos; |
| else |
| temp = _rl_last_c_pos - WRAP_OFFSET (_rl_last_v_pos, visible_wrap_offset); |
| if (temp == _rl_screenwidth && _rl_term_autowrap && !_rl_horizontal_scroll_mode |
| && _rl_last_v_pos == current_line - 1) |
| { |
| #if defined (HANDLE_MULTIBYTE) |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| { |
| wchar_t wc; |
| mbstate_t ps; |
| int tempwidth, bytes; |
| size_t ret; |
| |
| /* This fixes only double-column characters, but if the wrapped |
| character comsumes more than three columns, spaces will be |
| inserted in the string buffer. */ |
| if (current_line < line_state_visible->wbsize && line_state_visible->wrapped_line[current_line] > 0) |
| _rl_clear_to_eol (line_state_visible->wrapped_line[current_line]); |
| |
| memset (&ps, 0, sizeof (mbstate_t)); |
| ret = mbrtowc (&wc, new, MB_CUR_MAX, &ps); |
| if (MB_INVALIDCH (ret)) |
| { |
| tempwidth = 1; |
| ret = 1; |
| } |
| else if (MB_NULLWCH (ret)) |
| tempwidth = 0; |
| else |
| tempwidth = wcwidth (wc); |
| |
| if (tempwidth > 0) |
| { |
| int count, i; |
| bytes = ret; |
| for (count = 0; count < bytes; count++) |
| putc (new[count], rl_outstream); |
| _rl_last_c_pos = tempwidth; |
| _rl_last_v_pos++; |
| memset (&ps, 0, sizeof (mbstate_t)); |
| ret = mbrtowc (&wc, old, MB_CUR_MAX, &ps); |
| if (ret != 0 && bytes != 0) |
| { |
| if (MB_INVALIDCH (ret)) |
| ret = 1; |
| memmove (old+bytes, old+ret, strlen (old+ret)); |
| memcpy (old, new, bytes); |
| /* Fix up indices if we copy data from one line to another */ |
| omax += bytes - ret; |
| for (i = current_line+1; i < inv_botlin+1; i++) |
| vis_lbreaks[i] += bytes - ret; |
| } |
| } |
| else |
| { |
| putc (' ', rl_outstream); |
| _rl_last_c_pos = 1; |
| _rl_last_v_pos++; |
| if (old[0] && new[0]) |
| old[0] = new[0]; |
| } |
| } |
| else |
| #endif |
| { |
| if (new[0]) |
| putc (new[0], rl_outstream); |
| else |
| putc (' ', rl_outstream); |
| _rl_last_c_pos = 1; |
| _rl_last_v_pos++; |
| if (old[0] && new[0]) |
| old[0] = new[0]; |
| } |
| } |
| |
| |
| /* Find first difference. */ |
| #if defined (HANDLE_MULTIBYTE) |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| { |
| /* See if the old line is a subset of the new line, so that the |
| only change is adding characters. */ |
| temp = (omax < nmax) ? omax : nmax; |
| if (memcmp (old, new, temp) == 0) /* adding at the end */ |
| { |
| ofd = old + temp; |
| nfd = new + temp; |
| } |
| else |
| { |
| memset (&ps_new, 0, sizeof(mbstate_t)); |
| memset (&ps_old, 0, sizeof(mbstate_t)); |
| |
| if (omax == nmax && STREQN (new, old, omax)) |
| { |
| ofd = old + omax; |
| nfd = new + nmax; |
| } |
| else |
| { |
| new_offset = old_offset = 0; |
| for (ofd = old, nfd = new; |
| (ofd - old < omax) && *ofd && |
| _rl_compare_chars(old, old_offset, &ps_old, new, new_offset, &ps_new); ) |
| { |
| old_offset = _rl_find_next_mbchar (old, old_offset, 1, MB_FIND_ANY); |
| new_offset = _rl_find_next_mbchar (new, new_offset, 1, MB_FIND_ANY); |
| ofd = old + old_offset; |
| nfd = new + new_offset; |
| } |
| } |
| } |
| } |
| else |
| #endif |
| for (ofd = old, nfd = new; |
| (ofd - old < omax) && *ofd && (*ofd == *nfd); |
| ofd++, nfd++) |
| ; |
| |
| /* Move to the end of the screen line. ND and OD are used to keep track |
| of the distance between ne and new and oe and old, respectively, to |
| move a subtraction out of each loop. */ |
| for (od = ofd - old, oe = ofd; od < omax && *oe; oe++, od++); |
| for (nd = nfd - new, ne = nfd; nd < nmax && *ne; ne++, nd++); |
| |
| /* If no difference, continue to next line. */ |
| if (ofd == oe && nfd == ne) |
| return; |
| |
| wsatend = 1; /* flag for trailing whitespace */ |
| |
| #if defined (HANDLE_MULTIBYTE) |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| { |
| ols = old + _rl_find_prev_mbchar (old, oe - old, MB_FIND_ANY); |
| nls = new + _rl_find_prev_mbchar (new, ne - new, MB_FIND_ANY); |
| while ((ols > ofd) && (nls > nfd)) |
| { |
| memset (&ps_old, 0, sizeof (mbstate_t)); |
| memset (&ps_new, 0, sizeof (mbstate_t)); |
| |
| #if 0 |
| /* On advice from jir@yamato.ibm.com */ |
| _rl_adjust_point (old, ols - old, &ps_old); |
| _rl_adjust_point (new, nls - new, &ps_new); |
| #endif |
| |
| if (_rl_compare_chars (old, ols - old, &ps_old, new, nls - new, &ps_new) == 0) |
| break; |
| |
| if (*ols == ' ') |
| wsatend = 0; |
| |
| ols = old + _rl_find_prev_mbchar (old, ols - old, MB_FIND_ANY); |
| nls = new + _rl_find_prev_mbchar (new, nls - new, MB_FIND_ANY); |
| } |
| } |
| else |
| { |
| #endif /* HANDLE_MULTIBYTE */ |
| ols = oe - 1; /* find last same */ |
| nls = ne - 1; |
| while ((ols > ofd) && (nls > nfd) && (*ols == *nls)) |
| { |
| if (*ols != ' ') |
| wsatend = 0; |
| ols--; |
| nls--; |
| } |
| #if defined (HANDLE_MULTIBYTE) |
| } |
| #endif |
| |
| if (wsatend) |
| { |
| ols = oe; |
| nls = ne; |
| } |
| #if defined (HANDLE_MULTIBYTE) |
| /* This may not work for stateful encoding, but who cares? To handle |
| stateful encoding properly, we have to scan each string from the |
| beginning and compare. */ |
| else if (_rl_compare_chars (ols, 0, NULL, nls, 0, NULL) == 0) |
| #else |
| else if (*ols != *nls) |
| #endif |
| { |
| if (*ols) /* don't step past the NUL */ |
| { |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| ols = old + _rl_find_next_mbchar (old, ols - old, 1, MB_FIND_ANY); |
| else |
| ols++; |
| } |
| if (*nls) |
| { |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| nls = new + _rl_find_next_mbchar (new, nls - new, 1, MB_FIND_ANY); |
| else |
| nls++; |
| } |
| } |
| |
| /* count of invisible characters in the current invisible line. */ |
| current_invis_chars = W_OFFSET (current_line, wrap_offset); |
| if (_rl_last_v_pos != current_line) |
| { |
| _rl_move_vert (current_line); |
| if ((MB_CUR_MAX == 1 || rl_byte_oriented) && current_line == 0 && visible_wrap_offset) |
| _rl_last_c_pos += visible_wrap_offset; |
| } |
| |
| /* If this is the first line and there are invisible characters in the |
| prompt string, and the prompt string has not changed, and the current |
| cursor position is before the last invisible character in the prompt, |
| and the index of the character to move to is past the end of the prompt |
| string, then redraw the entire prompt string. We can only do this |
| reliably if the terminal supports a `cr' capability. |
| |
| This is not an efficiency hack -- there is a problem with redrawing |
| portions of the prompt string if they contain terminal escape |
| sequences (like drawing the `unbold' sequence without a corresponding |
| `bold') that manifests itself on certain terminals. */ |
| |
| lendiff = local_prompt_len; |
| od = ofd - old; /* index of first difference in visible line */ |
| if (current_line == 0 && !_rl_horizontal_scroll_mode && |
| _rl_term_cr && lendiff > prompt_visible_length && _rl_last_c_pos > 0 && |
| od >= lendiff && _rl_last_c_pos < PROMPT_ENDING_INDEX) |
| { |
| #if defined (__MSDOS__) |
| putc ('\r', rl_outstream); |
| #else |
| tputs (_rl_term_cr, 1, _rl_output_character_function); |
| #endif |
| if (modmark) |
| _rl_output_some_chars ("*", 1); |
| _rl_output_some_chars (local_prompt, lendiff); |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| { |
| /* We take wrap_offset into account here so we can pass correct |
| information to _rl_move_cursor_relative. */ |
| _rl_last_c_pos = _rl_col_width (local_prompt, 0, lendiff, 1) - wrap_offset + modmark; |
| cpos_adjusted = 1; |
| } |
| else |
| _rl_last_c_pos = lendiff + modmark; |
| } |
| |
| o_cpos = _rl_last_c_pos; |
| |
| /* When this function returns, _rl_last_c_pos is correct, and an absolute |
| cursor postion in multibyte mode, but a buffer index when not in a |
| multibyte locale. */ |
| _rl_move_cursor_relative (od, old); |
| #if 1 |
| #if defined (HANDLE_MULTIBYTE) |
| /* We need to indicate that the cursor position is correct in the presence of |
| invisible characters in the prompt string. Let's see if setting this when |
| we make sure we're at the end of the drawn prompt string works. */ |
| if (current_line == 0 && MB_CUR_MAX > 1 && rl_byte_oriented == 0 && |
| (_rl_last_c_pos > 0 || o_cpos > 0) && |
| _rl_last_c_pos == prompt_physical_chars) |
| cpos_adjusted = 1; |
| #endif |
| #endif |
| |
| /* if (len (new) > len (old)) |
| lendiff == difference in buffer |
| col_lendiff == difference on screen |
| When not using multibyte characters, these are equal */ |
| lendiff = (nls - nfd) - (ols - ofd); |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| col_lendiff = _rl_col_width (new, nfd - new, nls - new, 1) - _rl_col_width (old, ofd - old, ols - old, 1); |
| else |
| col_lendiff = lendiff; |
| |
| /* If we are changing the number of invisible characters in a line, and |
| the spot of first difference is before the end of the invisible chars, |
| lendiff needs to be adjusted. */ |
| if (current_line == 0 && !_rl_horizontal_scroll_mode && |
| current_invis_chars != visible_wrap_offset) |
| { |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| { |
| lendiff += visible_wrap_offset - current_invis_chars; |
| col_lendiff += visible_wrap_offset - current_invis_chars; |
| } |
| else |
| { |
| lendiff += visible_wrap_offset - current_invis_chars; |
| col_lendiff = lendiff; |
| } |
| } |
| |
| /* Insert (diff (len (old), len (new)) ch. */ |
| temp = ne - nfd; |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| col_temp = _rl_col_width (new, nfd - new, ne - new, 1); |
| else |
| col_temp = temp; |
| |
| if (col_lendiff > 0) /* XXX - was lendiff */ |
| { |
| /* Non-zero if we're increasing the number of lines. */ |
| int gl = current_line >= _rl_vis_botlin && inv_botlin > _rl_vis_botlin; |
| /* If col_lendiff is > 0, implying that the new string takes up more |
| screen real estate than the old, but lendiff is < 0, meaning that it |
| takes fewer bytes, we need to just output the characters starting |
| from the first difference. These will overwrite what is on the |
| display, so there's no reason to do a smart update. This can really |
| only happen in a multibyte environment. */ |
| if (lendiff < 0) |
| { |
| _rl_output_some_chars (nfd, temp); |
| _rl_last_c_pos += _rl_col_width (nfd, 0, temp, 1); |
| /* If nfd begins before any invisible characters in the prompt, |
| adjust _rl_last_c_pos to account for wrap_offset and set |
| cpos_adjusted to let the caller know. */ |
| if (current_line == 0 && wrap_offset && ((nfd - new) <= prompt_last_invisible)) |
| { |
| _rl_last_c_pos -= wrap_offset; |
| cpos_adjusted = 1; |
| } |
| return; |
| } |
| /* Sometimes it is cheaper to print the characters rather than |
| use the terminal's capabilities. If we're growing the number |
| of lines, make sure we actually cause the new line to wrap |
| around on auto-wrapping terminals. */ |
| else if (_rl_terminal_can_insert && ((2 * col_temp) >= col_lendiff || _rl_term_IC) && (!_rl_term_autowrap || !gl)) |
| { |
| /* If lendiff > prompt_visible_length and _rl_last_c_pos == 0 and |
| _rl_horizontal_scroll_mode == 1, inserting the characters with |
| _rl_term_IC or _rl_term_ic will screw up the screen because of the |
| invisible characters. We need to just draw them. */ |
| /* The same thing happens if we're trying to draw before the last |
| invisible character in the prompt string or we're increasing the |
| number of invisible characters in the line and we're not drawing |
| the entire prompt string. */ |
| if (*ols && ((_rl_horizontal_scroll_mode && |
| _rl_last_c_pos == 0 && |
| lendiff > prompt_visible_length && |
| current_invis_chars > 0) == 0) && |
| (((MB_CUR_MAX > 1 && rl_byte_oriented == 0) && |
| current_line == 0 && wrap_offset && |
| ((nfd - new) <= prompt_last_invisible) && |
| (col_lendiff < prompt_visible_length)) == 0) && |
| (visible_wrap_offset >= current_invis_chars)) |
| { |
| insert_some_chars (nfd, lendiff, col_lendiff); |
| _rl_last_c_pos += col_lendiff; |
| } |
| #if 0 /* XXX - for now */ |
| else if ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) && _rl_last_c_pos == 0 && wrap_offset && (nfd-new) <= prompt_last_invisible && col_lendiff < prompt_visible_length && visible_wrap_offset >= current_invis_chars) |
| { |
| _rl_output_some_chars (nfd, lendiff); |
| _rl_last_c_pos += col_lendiff; |
| } |
| #endif |
| else if ((MB_CUR_MAX == 1 || rl_byte_oriented != 0) && *ols == 0 && lendiff > 0) |
| { |
| /* At the end of a line the characters do not have to |
| be "inserted". They can just be placed on the screen. */ |
| /* However, this screws up the rest of this block, which |
| assumes you've done the insert because you can. */ |
| _rl_output_some_chars (nfd, lendiff); |
| _rl_last_c_pos += col_lendiff; |
| } |
| else |
| { |
| _rl_output_some_chars (nfd, temp); |
| _rl_last_c_pos += col_temp; |
| /* If nfd begins before the last invisible character in the |
| prompt, adjust _rl_last_c_pos to account for wrap_offset |
| and set cpos_adjusted to let the caller know. */ |
| if ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) && current_line == 0 && wrap_offset && ((nfd - new) <= prompt_last_invisible)) |
| { |
| _rl_last_c_pos -= wrap_offset; |
| cpos_adjusted = 1; |
| } |
| return; |
| } |
| /* Copy (new) chars to screen from first diff to last match. */ |
| temp = nls - nfd; |
| if ((temp - lendiff) > 0) |
| { |
| _rl_output_some_chars (nfd + lendiff, temp - lendiff); |
| /* XXX -- this bears closer inspection. Fixes a redisplay bug |
| reported against bash-3.0-alpha by Andreas Schwab involving |
| multibyte characters and prompt strings with invisible |
| characters, but was previously disabled. */ |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| twidth = _rl_col_width (nfd+lendiff, 0, temp-col_lendiff, 1); |
| else |
| twidth = temp - lendiff; |
| _rl_last_c_pos += twidth; |
| /* If nfd begins before the last invisible character in the |
| prompt, adjust _rl_last_c_pos to account for wrap_offset |
| and set cpos_adjusted to let the caller know. */ |
| if ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) && current_line == 0 && wrap_offset && ((nfd - new) <= prompt_last_invisible)) |
| { |
| _rl_last_c_pos -= wrap_offset; |
| cpos_adjusted = 1; |
| } |
| } |
| } |
| else |
| { |
| /* cannot insert chars, write to EOL */ |
| _rl_output_some_chars (nfd, temp); |
| _rl_last_c_pos += col_temp; |
| /* If we're in a multibyte locale and were before the last invisible |
| char in the current line (which implies we just output some invisible |
| characters) we need to adjust _rl_last_c_pos, since it represents |
| a physical character position. */ |
| if ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) && |
| current_line == prompt_last_screen_line && wrap_offset && |
| wrap_offset != prompt_invis_chars_first_line && |
| ((nfd-new) < (prompt_last_invisible-(current_line*_rl_screenwidth)))) |
| { |
| _rl_last_c_pos -= wrap_offset - prompt_invis_chars_first_line; |
| cpos_adjusted = 1; |
| } |
| } |
| } |
| else /* Delete characters from line. */ |
| { |
| /* If possible and inexpensive to use terminal deletion, then do so. */ |
| if (_rl_term_dc && (2 * col_temp) >= -col_lendiff) |
| { |
| /* If all we're doing is erasing the invisible characters in the |
| prompt string, don't bother. It screws up the assumptions |
| about what's on the screen. */ |
| if (_rl_horizontal_scroll_mode && _rl_last_c_pos == 0 && |
| -lendiff == visible_wrap_offset) |
| col_lendiff = 0; |
| |
| if (col_lendiff) |
| delete_chars (-col_lendiff); /* delete (diff) characters */ |
| |
| /* Copy (new) chars to screen from first diff to last match */ |
| temp = nls - nfd; |
| if (temp > 0) |
| { |
| /* If nfd begins at the prompt, or before the invisible |
| characters in the prompt, we need to adjust _rl_last_c_pos |
| in a multibyte locale to account for the wrap offset and |
| set cpos_adjusted accordingly. */ |
| _rl_output_some_chars (nfd, temp); |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| { |
| _rl_last_c_pos += _rl_col_width (nfd, 0, temp, 1); |
| if (current_line == 0 && wrap_offset && ((nfd - new) <= prompt_last_invisible)) |
| { |
| _rl_last_c_pos -= wrap_offset; |
| cpos_adjusted = 1; |
| } |
| } |
| else |
| _rl_last_c_pos += temp; |
| } |
| } |
| /* Otherwise, print over the existing material. */ |
| else |
| { |
| if (temp > 0) |
| { |
| /* If nfd begins at the prompt, or before the invisible |
| characters in the prompt, we need to adjust _rl_last_c_pos |
| in a multibyte locale to account for the wrap offset and |
| set cpos_adjusted accordingly. */ |
| _rl_output_some_chars (nfd, temp); |
| _rl_last_c_pos += col_temp; /* XXX */ |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| { |
| if (current_line == 0 && wrap_offset && ((nfd - new) <= prompt_last_invisible)) |
| { |
| _rl_last_c_pos -= wrap_offset; |
| cpos_adjusted = 1; |
| } |
| } |
| } |
| lendiff = (oe - old) - (ne - new); |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| col_lendiff = _rl_col_width (old, 0, oe - old, 1) - _rl_col_width (new, 0, ne - new, 1); |
| else |
| col_lendiff = lendiff; |
| |
| #if 0 |
| if (col_lendiff) |
| #else |
| /* If we've already printed over the entire width of the screen, |
| including the old material, then col_lendiff doesn't matter and |
| space_to_eol will insert too many spaces. XXX - maybe we should |
| adjust col_lendiff based on the difference between _rl_last_c_pos |
| and _rl_screenwidth */ |
| if (col_lendiff && ((MB_CUR_MAX == 1 || rl_byte_oriented) || (_rl_last_c_pos < _rl_screenwidth))) |
| #endif |
| { |
| if (_rl_term_autowrap && current_line < inv_botlin) |
| space_to_eol (col_lendiff); |
| else |
| _rl_clear_to_eol (col_lendiff); |
| } |
| } |
| } |
| } |
| |
| /* Tell the update routines that we have moved onto a new (empty) line. */ |
| int |
| rl_on_new_line () |
| { |
| if (visible_line) |
| visible_line[0] = '\0'; |
| |
| _rl_last_c_pos = _rl_last_v_pos = 0; |
| _rl_vis_botlin = last_lmargin = 0; |
| if (vis_lbreaks) |
| vis_lbreaks[0] = vis_lbreaks[1] = 0; |
| visible_wrap_offset = 0; |
| return 0; |
| } |
| |
| /* Tell the update routines that we have moved onto a new line with the |
| prompt already displayed. Code originally from the version of readline |
| distributed with CLISP. rl_expand_prompt must have already been called |
| (explicitly or implicitly). This still doesn't work exactly right. */ |
| int |
| rl_on_new_line_with_prompt () |
| { |
| int prompt_size, i, l, real_screenwidth, newlines; |
| char *prompt_last_line, *lprompt; |
| |
| /* Initialize visible_line and invisible_line to ensure that they can hold |
| the already-displayed prompt. */ |
| prompt_size = strlen (rl_prompt) + 1; |
| init_line_structures (prompt_size); |
| |
| /* Make sure the line structures hold the already-displayed prompt for |
| redisplay. */ |
| lprompt = local_prompt ? local_prompt : rl_prompt; |
| strcpy (visible_line, lprompt); |
| strcpy (invisible_line, lprompt); |
| |
| /* If the prompt contains newlines, take the last tail. */ |
| prompt_last_line = strrchr (rl_prompt, '\n'); |
| if (!prompt_last_line) |
| prompt_last_line = rl_prompt; |
| |
| l = strlen (prompt_last_line); |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| _rl_last_c_pos = _rl_col_width (prompt_last_line, 0, l, 1); /* XXX */ |
| else |
| _rl_last_c_pos = l; |
| |
| /* Dissect prompt_last_line into screen lines. Note that here we have |
| to use the real screenwidth. Readline's notion of screenwidth might be |
| one less, see terminal.c. */ |
| real_screenwidth = _rl_screenwidth + (_rl_term_autowrap ? 0 : 1); |
| _rl_last_v_pos = l / real_screenwidth; |
| /* If the prompt length is a multiple of real_screenwidth, we don't know |
| whether the cursor is at the end of the last line, or already at the |
| beginning of the next line. Output a newline just to be safe. */ |
| if (l > 0 && (l % real_screenwidth) == 0) |
| _rl_output_some_chars ("\n", 1); |
| last_lmargin = 0; |
| |
| newlines = 0; i = 0; |
| while (i <= l) |
| { |
| _rl_vis_botlin = newlines; |
| vis_lbreaks[newlines++] = i; |
| i += real_screenwidth; |
| } |
| vis_lbreaks[newlines] = l; |
| visible_wrap_offset = 0; |
| |
| rl_display_prompt = rl_prompt; /* XXX - make sure it's set */ |
| |
| return 0; |
| } |
| |
| /* Actually update the display, period. */ |
| int |
| rl_forced_update_display () |
| { |
| register char *temp; |
| |
| if (visible_line) |
| { |
| temp = visible_line; |
| while (*temp) |
| *temp++ = '\0'; |
| } |
| rl_on_new_line (); |
| forced_display++; |
| (*rl_redisplay_function) (); |
| return 0; |
| } |
| |
| /* Move the cursor from _rl_last_c_pos to NEW, which are buffer indices. |
| (Well, when we don't have multibyte characters, _rl_last_c_pos is a |
| buffer index.) |
| DATA is the contents of the screen line of interest; i.e., where |
| the movement is being done. */ |
| void |
| _rl_move_cursor_relative (new, data) |
| int new; |
| const char *data; |
| { |
| register int i; |
| int woff; /* number of invisible chars on current line */ |
| int cpos, dpos; /* current and desired cursor positions */ |
| int adjust; |
| |
| woff = WRAP_OFFSET (_rl_last_v_pos, wrap_offset); |
| cpos = _rl_last_c_pos; |
| |
| if (cpos == 0 && cpos == new) |
| return; |
| |
| #if defined (HANDLE_MULTIBYTE) |
| /* If we have multibyte characters, NEW is indexed by the buffer point in |
| a multibyte string, but _rl_last_c_pos is the display position. In |
| this case, NEW's display position is not obvious and must be |
| calculated. We need to account for invisible characters in this line, |
| as long as we are past them and they are counted by _rl_col_width. */ |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| { |
| adjust = 1; |
| /* Try to short-circuit common cases and eliminate a bunch of multibyte |
| character function calls. */ |
| /* 1. prompt string */ |
| if (new == local_prompt_len && memcmp (data, local_prompt, new) == 0) |
| { |
| dpos = prompt_physical_chars; |
| cpos_adjusted = 1; |
| adjust = 0; |
| } |
| /* 2. prompt_string + line contents */ |
| else if (new > local_prompt_len && local_prompt && memcmp (data, local_prompt, local_prompt_len) == 0) |
| { |
| dpos = prompt_physical_chars + _rl_col_width (data, local_prompt_len, new, 1); |
| cpos_adjusted = 1; |
| adjust = 0; |
| } |
| else |
| dpos = _rl_col_width (data, 0, new, 1); |
| |
| /* Use NEW when comparing against the last invisible character in the |
| prompt string, since they're both buffer indices and DPOS is a |
| desired display position. */ |
| if (adjust && ((new > prompt_last_invisible) || /* XXX - don't use woff here */ |
| (prompt_physical_chars >= _rl_screenwidth && |
| _rl_last_v_pos == prompt_last_screen_line && |
| wrap_offset >= woff && dpos >= woff && |
| new > (prompt_last_invisible-(_rl_screenwidth*_rl_last_v_pos)-wrap_offset)))) |
| /* XXX last comparison might need to be >= */ |
| { |
| dpos -= woff; |
| /* Since this will be assigned to _rl_last_c_pos at the end (more |
| precisely, _rl_last_c_pos == dpos when this function returns), |
| let the caller know. */ |
| cpos_adjusted = 1; |
| } |
| } |
| else |
| #endif |
| dpos = new; |
| |
| /* If we don't have to do anything, then return. */ |
| if (cpos == dpos) |
| return; |
| |
| /* It may be faster to output a CR, and then move forwards instead |
| of moving backwards. */ |
| /* i == current physical cursor position. */ |
| #if defined (HANDLE_MULTIBYTE) |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| i = _rl_last_c_pos; |
| else |
| #endif |
| i = _rl_last_c_pos - woff; |
| if (dpos == 0 || CR_FASTER (dpos, _rl_last_c_pos) || |
| (_rl_term_autowrap && i == _rl_screenwidth)) |
| { |
| #if defined (__MSDOS__) |
| putc ('\r', rl_outstream); |
| #else |
| tputs (_rl_term_cr, 1, _rl_output_character_function); |
| #endif /* !__MSDOS__ */ |
| cpos = _rl_last_c_pos = 0; |
| } |
| |
| if (cpos < dpos) |
| { |
| /* Move the cursor forward. We do it by printing the command |
| to move the cursor forward if there is one, else print that |
| portion of the output buffer again. Which is cheaper? */ |
| |
| /* The above comment is left here for posterity. It is faster |
| to print one character (non-control) than to print a control |
| sequence telling the terminal to move forward one character. |
| That kind of control is for people who don't know what the |
| data is underneath the cursor. */ |
| |
| /* However, we need a handle on where the current display position is |
| in the buffer for the immediately preceding comment to be true. |
| In multibyte locales, we don't currently have that info available. |
| Without it, we don't know where the data we have to display begins |
| in the buffer and we have to go back to the beginning of the screen |
| line. In this case, we can use the terminal sequence to move forward |
| if it's available. */ |
| if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) |
| { |
| if (_rl_term_forward_char) |
| { |
| for (i = cpos; i < dpos; i++) |
| tputs (_rl_term_forward_char, 1, _rl_output_character_function); |
| } |
| else |
| { |
| tputs (_rl_term_cr, 1, _rl_output_character_function); |
| for (i = 0; i < new; i++) |
| putc (data[i], rl_outstream); |
| } |
| } |
| else |
| for (i = cpos; i < new; i++) |
| putc (data[i], rl_outstream); |
| } |
| |
| #if defined (HANDLE_MULTIBYTE) |
| /* NEW points to the buffer point, but _rl_last_c_pos is the display point. |
| The byte length of the string is probably bigger than the column width |
| of the string, which means that if NEW == _rl_last_c_pos, then NEW's |
| display point is less than _rl_last_c_pos. */ |
| #endif |
| else if (cpos > dpos) |
| _rl_backspace (cpos - dpos); |
| |
| _rl_last_c_pos = dpos; |
| } |
| |
| /* PWP: move the cursor up or down. */ |
| void |
| _rl_move_vert (to) |
| int to; |
| { |
| register int delta, i; |
| |
| if (_rl_last_v_pos == to || to > _rl_screenheight) |
| return; |
| |
| if ((delta = to - _rl_last_v_pos) > 0) |
| { |
| for (i = 0; i < delta; i++) |
| putc ('\n', rl_outstream); |
| #if defined (__MSDOS__) |
| putc ('\r', rl_outstream); |
| #else |
| tputs (_rl_term_cr, 1, _rl_output_character_function); |
| #endif |
| _rl_last_c_pos = 0; |
| } |
| else |
| { /* delta < 0 */ |
| #ifdef __MSDOS__ |
| int row, col; |
| |
| fflush (rl_outstream); /* make sure the cursor pos is current! */ |
| ScreenGetCursor (&row, &col); |
| ScreenSetCursor (row + delta, col); |
| i = -delta; /* in case someone wants to use it after the loop */ |
| #else /* !__MSDOS__ */ |
| if (_rl_term_up && *_rl_term_up) |
| for (i = 0; i < -delta; i++) |
| tputs (_rl_term_up, 1, _rl_output_character_function); |
| #endif /* !__MSDOS__ */ |
| } |
| |
| _rl_last_v_pos = to; /* Now TO is here */ |
| } |
| |
| /* Physically print C on rl_outstream. This is for functions which know |
| how to optimize the display. Return the number of characters output. */ |
| int |
| rl_show_char (c) |
| int c; |
| { |
| int n = 1; |
| if (META_CHAR (c) && (_rl_output_meta_chars == 0)) |
| { |
| fprintf (rl_outstream, "M-"); |
| n += 2; |
| c = UNMETA (c); |
| } |
| |
| #if defined (DISPLAY_TABS) |
| if ((CTRL_CHAR (c) && c != '\t') || c == RUBOUT) |
| #else |
| if (CTRL_CHAR (c) || c == RUBOUT) |
| #endif /* !DISPLAY_TABS */ |
| { |
| fprintf (rl_outstream, "C-"); |
| n += 2; |
| c = CTRL_CHAR (c) ? UNCTRL (c) : '?'; |
| } |
| |
| putc (c, rl_outstream); |
| fflush (rl_outstream); |
| return n; |
| } |
| |
| int |
| rl_character_len (c, pos) |
| register int c, pos; |
| { |
| unsigned char uc; |
| |
| uc = (unsigned char)c; |
| |
| if (META_CHAR (uc)) |
| return ((_rl_output_meta_chars == 0) ? 4 : 1); |
| |
| if (uc == '\t') |
| { |
| #if defined (DISPLAY_TABS) |
| return (((pos | 7) + 1) - pos); |
| #else |
| return (2); |
| #endif /* !DISPLAY_TABS */ |
| } |
| |
| if (CTRL_CHAR (c) || c == RUBOUT) |
| return (2); |
| |
| return ((ISPRINT (uc)) ? 1 : 2); |
| } |
| /* How to print things in the "echo-area". The prompt is treated as a |
| mini-modeline. */ |
| static int msg_saved_prompt = 0; |
| |
| #if defined (USE_VARARGS) |
| int |
| #if defined (PREFER_STDARG) |
| rl_message (const char *format, ...) |
| #else |
| rl_message (va_alist) |
| va_dcl |
| #endif |
| { |
| va_list args; |
| #if defined (PREFER_VARARGS) |
| char *format; |
| #endif |
| |
| #if defined (PREFER_STDARG) |
| va_start (args, format); |
| #else |
| va_start (args); |
| format = va_arg (args, char *); |
| #endif |
| |
| #if defined (HAVE_VSNPRINTF) |
| vsnprintf (msg_buf, sizeof (msg_buf) - 1, format, args); |
| #else |
| vsprintf (msg_buf, format, args); |
| msg_buf[sizeof(msg_buf) - 1] = '\0'; /* overflow? */ |
| #endif |
| va_end (args); |
| |
| if (saved_local_prompt == 0) |
| { |
| rl_save_prompt (); |
| msg_saved_prompt = 1; |
| } |
| rl_display_prompt = msg_buf; |
| local_prompt = expand_prompt (msg_buf, &prompt_visible_length, |
| &prompt_last_invisible, |
| &prompt_invis_chars_first_line, |
| &prompt_physical_chars); |
| local_prompt_prefix = (char *)NULL; |
| local_prompt_len = local_prompt ? strlen (local_prompt) : 0; |
| (*rl_redisplay_function) (); |
| |
| return 0; |
| } |
| #else /* !USE_VARARGS */ |
| int |
| rl_message (format, arg1, arg2) |
| char *format; |
| { |
| sprintf (msg_buf, format, arg1, arg2); |
| msg_buf[sizeof(msg_buf) - 1] = '\0'; /* overflow? */ |
| |
| rl_display_prompt = msg_buf; |
| if (saved_local_prompt == 0) |
| { |
| rl_save_prompt (); |
| msg_saved_prompt = 1; |
| } |
| local_prompt = expand_prompt (msg_buf, &prompt_visible_length, |
| &prompt_last_invisible, |
| &prompt_invis_chars_first_line, |
| &prompt_physical_chars); |
| local_prompt_prefix = (char *)NULL; |
| local_prompt_len = local_prompt ? strlen (local_prompt) : 0; |
| (*rl_redisplay_function) (); |
| |
| return 0; |
| } |
| #endif /* !USE_VARARGS */ |
| |
| /* How to clear things from the "echo-area". */ |
| int |
| rl_clear_message () |
| { |
| rl_display_prompt = rl_prompt; |
| if (msg_saved_prompt) |
| { |
| rl_restore_prompt (); |
| msg_saved_prompt = 0; |
| } |
| (*rl_redisplay_function) (); |
| return 0; |
| } |
| |
| int |
| rl_reset_line_state () |
| { |
| rl_on_new_line (); |
| |
| rl_display_prompt = rl_prompt ? rl_prompt : ""; |
| forced_display = 1; |
| return 0; |
| } |
| |
| void |
| rl_save_prompt () |
| { |
| saved_local_prompt = local_prompt; |
| saved_local_prefix = local_prompt_prefix; |
| saved_prefix_length = prompt_prefix_length; |
| saved_local_length = local_prompt_len; |
| saved_last_invisible = prompt_last_invisible; |
| saved_visible_length = prompt_visible_length; |
| saved_invis_chars_first_line = prompt_invis_chars_first_line; |
| saved_physical_chars = prompt_physical_chars; |
| |
| local_prompt = local_prompt_prefix = (char *)0; |
| local_prompt_len = 0; |
| prompt_last_invisible = prompt_visible_length = prompt_prefix_length = 0; |
| prompt_invis_chars_first_line = prompt_physical_chars = 0; |
| } |
| |
| void |
| rl_restore_prompt () |
| { |
| FREE (local_prompt); |
| FREE (local_prompt_prefix); |
| |
| local_prompt = saved_local_prompt; |
| local_prompt_prefix = saved_local_prefix; |
| local_prompt_len = saved_local_length; |
| prompt_prefix_length = saved_prefix_length; |
| prompt_last_invisible = saved_last_invisible; |
| prompt_visible_length = saved_visible_length; |
| prompt_invis_chars_first_line = saved_invis_chars_first_line; |
| prompt_physical_chars = saved_physical_chars; |
| |
| /* can test saved_local_prompt to see if prompt info has been saved. */ |
| saved_local_prompt = saved_local_prefix = (char *)0; |
| saved_local_length = 0; |
| saved_last_invisible = saved_visible_length = saved_prefix_length = 0; |
| saved_invis_chars_first_line = saved_physical_chars = 0; |
| } |
| |
| char * |
| _rl_make_prompt_for_search (pchar) |
| int pchar; |
| { |
| int len; |
| char *pmt, *p; |
| |
| rl_save_prompt (); |
| |
| /* We've saved the prompt, and can do anything with the various prompt |
| strings we need before they're restored. We want the unexpanded |
| portion of the prompt string after any final newline. */ |
| p = rl_prompt ? strrchr (rl_prompt, '\n') : 0; |
| if (p == 0) |
| { |
| len = (rl_prompt && *rl_prompt) ? strlen (rl_prompt) : 0; |
| pmt = (char *)xmalloc (len + 2); |
| if (len) |
| strcpy (pmt, rl_prompt); |
| pmt[len] = pchar; |
| pmt[len+1] = '\0'; |
| } |
| else |
| { |
| p++; |
| len = strlen (p); |
| pmt = (char *)xmalloc (len + 2); |
| if (len) |
| strcpy (pmt, p); |
| pmt[len] = pchar; |
| pmt[len+1] = '\0'; |
| } |
| |
| /* will be overwritten by expand_prompt, called from rl_message */ |
| prompt_physical_chars = saved_physical_chars + 1; |
| return pmt; |
| } |
| |
| /* Quick redisplay hack when erasing characters at the end of the line. */ |
| void |
| _rl_erase_at_end_of_line (l) |
| int l; |
| { |
| register int i; |
| |
| _rl_backspace (l); |
| for (i = 0; i < l; i++) |
| putc (' ', rl_outstream); |
| _rl_backspace (l); |
| for (i = 0; i < l; i++) |
| visible_line[--_rl_last_c_pos] = '\0'; |
| rl_display_fixed++; |
| } |
| |
| /* Clear to the end of the line. COUNT is the minimum |
| number of character spaces to clear, */ |
| void |
| _rl_clear_to_eol (count) |
| int count; |
| { |
| #ifndef __MSDOS__ |
| if (_rl_term_clreol) |
| tputs (_rl_term_clreol, 1, _rl_output_character_function); |
| else |
| #endif |
| if (count) |
| space_to_eol (count); |
| } |
| |
| /* Clear to the end of the line using spaces. COUNT is the minimum |
| number of character spaces to clear, */ |
| static void |
| space_to_eol (count) |
| int count; |
| { |
| register int i; |
| |
| for (i = 0; i < count; i++) |
| putc (' ', rl_outstream); |
| |
| _rl_last_c_pos += count; |
| } |
| |
| void |
| _rl_clear_screen () |
| { |
| #if defined (__GO32__) |
| ScreenClear (); /* FIXME: only works in text modes */ |
| ScreenSetCursor (0, 0); /* term_clrpag is "cl" which homes the cursor */ |
| #else |
| if (_rl_term_clrpag) |
| tputs (_rl_term_clrpag, 1, _rl_output_character_function); |
| else |
| rl_crlf (); |
| #endif |
| } |
| |
| /* Insert COUNT characters from STRING to the output stream at column COL. */ |
| static void |
| insert_some_chars (string, count, col) |
| char *string; |
| int count, col; |
| { |
| #if defined (__MSDOS__) || (defined (__MINGW32__) && !defined (NCURSES_VERSION)) |
| _rl_output_some_chars (string, count); |
| #else |
| /* DEBUGGING */ |
| if (MB_CUR_MAX == 1 || rl_byte_oriented) |
| if (count != col) |
| _rl_ttymsg ("debug: insert_some_chars: count (%d) != col (%d)", count, col); |
| |
| /* If IC is defined, then we do not have to "enter" insert mode. */ |
| if (_rl_term_IC) |
| { |
| char *buffer; |
| |
| buffer = tgoto (_rl_term_IC, 0, col); |
| tputs (buffer, 1, _rl_output_character_function); |
| _rl_output_some_chars (string, count); |
| } |
| else |
| { |
| register int i; |
| |
| /* If we have to turn on insert-mode, then do so. */ |
| if (_rl_term_im && *_rl_term_im) |
| tputs (_rl_term_im, 1, _rl_output_character_function); |
| |
| /* If there is a special command for inserting characters, then |
| use that first to open up the space. */ |
| if (_rl_term_ic && *_rl_term_ic) |
| { |
| for (i = col; i--; ) |
| tputs (_rl_term_ic, 1, _rl_output_character_function); |
| } |
| |
| /* Print the text. */ |
| _rl_output_some_chars (string, count); |
| |
| /* If there is a string to turn off insert mode, we had best use |
| it now. */ |
| if (_rl_term_ei && *_rl_term_ei) |
| tputs (_rl_term_ei, 1, _rl_output_character_function); |
| } |
| #endif /* __MSDOS__ || __MINGW32__ */ |
| } |
| |
| /* Delete COUNT characters from the display line. */ |
| static void |
| delete_chars (count) |
| int count; |
| { |
| if (count > _rl_screenwidth) /* XXX */ |
| return; |
| |
| #if !defined (__MSDOS__) && !(defined (__MINGW32__) && !defined (NCURSES_VERSION)) |
| if (_rl_term_DC && *_rl_term_DC) |
| { |
| char *buffer; |
| buffer = tgoto (_rl_term_DC, count, count); |
| tputs (buffer, count, _rl_output_character_function); |
| } |
| else |
| { |
| if (_rl_term_dc && *_rl_term_dc) |
| while (count--) |
| tputs (_rl_term_dc, 1, _rl_output_character_function); |
| } |
| #endif /* !__MSDOS__ && !__MINGW32__ */ |
| } |
| |
| void |
| _rl_update_final () |
| { |
| int full_lines; |
| |
| full_lines = 0; |
| /* If the cursor is the only thing on an otherwise-blank last line, |
| compensate so we don't print an extra CRLF. */ |
| if (_rl_vis_botlin && _rl_last_c_pos == 0 && |
| visible_line[vis_lbreaks[_rl_vis_botlin]] == 0) |
| { |
| _rl_vis_botlin--; |
| full_lines = 1; |
| } |
| _rl_move_vert (_rl_vis_botlin); |
| /* If we've wrapped lines, remove the final xterm line-wrap flag. */ |
| if (full_lines && _rl_term_autowrap && (VIS_LLEN(_rl_vis_botlin) == _rl_screenwidth)) |
| { |
| char *last_line; |
| |
| last_line = &visible_line[vis_lbreaks[_rl_vis_botlin]]; |
| cpos_buffer_position = -1; /* don't know where we are in buffer */ |
| _rl_move_cursor_relative (_rl_screenwidth - 1, last_line); /* XXX */ |
| _rl_clear_to_eol (0); |
| putc (last_line[_rl_screenwidth - 1], rl_outstream); |
| } |
| _rl_vis_botlin = 0; |
| rl_crlf (); |
| fflush (rl_outstream); |
| rl_display_fixed++; |
| } |
| |
| /* Move to the start of the current line. */ |
| static void |
| cr () |
| { |
| if (_rl_term_cr) |
| { |
| #if defined (__MSDOS__) |
| putc ('\r', rl_outstream); |
| #else |
| tputs (_rl_term_cr, 1, _rl_output_character_function); |
| #endif |
| _rl_last_c_pos = 0; |
| } |
| } |
| |
| /* Redraw the last line of a multi-line prompt that may possibly contain |
| terminal escape sequences. Called with the cursor at column 0 of the |
| line to draw the prompt on. */ |
| static void |
| redraw_prompt (t) |
| char *t; |
| { |
| char *oldp; |
| |
| oldp = rl_display_prompt; |
| rl_save_prompt (); |
| |
| rl_display_prompt = t; |
| local_prompt = expand_prompt (t, &prompt_visible_length, |
| &prompt_last_invisible, |
| &prompt_invis_chars_first_line, |
| &prompt_physical_chars); |
| local_prompt_prefix = (char *)NULL; |
| local_prompt_len = local_prompt ? strlen (local_prompt) : 0; |
| |
| rl_forced_update_display (); |
| |
| rl_display_prompt = oldp; |
| rl_restore_prompt(); |
| } |
| |
| /* Redisplay the current line after a SIGWINCH is received. */ |
| void |
| _rl_redisplay_after_sigwinch () |
| { |
| char *t; |
| |
| /* Clear the last line (assuming that the screen size change will result in |
| either more or fewer characters on that line only) and put the cursor at |
| column 0. Make sure the right thing happens if we have wrapped to a new |
| screen line. */ |
| if (_rl_term_cr) |
| { |
| _rl_move_vert (_rl_vis_botlin); |
| |
| #if defined (__MSDOS__) |
| putc ('\r', rl_outstream); |
| #else |
| tputs (_rl_term_cr, 1, _rl_output_character_function); |
| #endif |
| _rl_last_c_pos = 0; |
| #if defined (__MSDOS__) |
| space_to_eol (_rl_screenwidth); |
| putc ('\r', rl_outstream); |
| #else |
| if (_rl_term_clreol) |
| tputs (_rl_term_clreol, 1, _rl_output_character_function); |
| else |
| { |
| space_to_eol (_rl_screenwidth); |
| tputs (_rl_term_cr, 1, _rl_output_character_function); |
| } |
| #endif |
| if (_rl_last_v_pos > 0) |
| _rl_move_vert (0); |
| } |
| else |
| rl_crlf (); |
| |
| /* Redraw only the last line of a multi-line prompt. */ |
| t = strrchr (rl_display_prompt, '\n'); |
| if (t) |
| redraw_prompt (++t); |
| else |
| rl_forced_update_display (); |
| } |
| |
| void |
| _rl_clean_up_for_exit () |
| { |
| if (_rl_echoing_p) |
| { |
| _rl_move_vert (_rl_vis_botlin); |
| _rl_vis_botlin = 0; |
| fflush (rl_outstream); |
| rl_restart_output (1, 0); |
| } |
| } |
| |
| void |
| _rl_erase_entire_line () |
| { |
| cr (); |
| _rl_clear_to_eol (0); |
| cr (); |
| fflush (rl_outstream); |
| } |
| |
| /* return the `current display line' of the cursor -- the number of lines to |
| move up to get to the first screen line of the current readline line. */ |
| int |
| _rl_current_display_line () |
| { |
| int ret, nleft; |
| |
| /* Find out whether or not there might be invisible characters in the |
| editing buffer. */ |
| if (rl_display_prompt == rl_prompt) |
| nleft = _rl_last_c_pos - _rl_screenwidth - rl_visible_prompt_length; |
| else |
| nleft = _rl_last_c_pos - _rl_screenwidth; |
| |
| if (nleft > 0) |
| ret = 1 + nleft / _rl_screenwidth; |
| else |
| ret = 0; |
| |
| return ret; |
| } |
| |
| #if defined (HANDLE_MULTIBYTE) |
| /* Calculate the number of screen columns occupied by STR from START to END. |
| In the case of multibyte characters with stateful encoding, we have to |
| scan from the beginning of the string to take the state into account. */ |
| static int |
| _rl_col_width (str, start, end, flags) |
| const char *str; |
| int start, end, flags; |
| { |
| wchar_t wc; |
| mbstate_t ps; |
| int tmp, point, width, max; |
| |
| if (end <= start) |
| return 0; |
| if (MB_CUR_MAX == 1 || rl_byte_oriented) |
| { |
| _rl_ttymsg ("_rl_col_width: called with MB_CUR_MAX == 1"); |
| return (end - start); |
| } |
| |
| memset (&ps, 0, sizeof (mbstate_t)); |
| |
| point = 0; |
| max = end; |
| |
| /* Try to short-circuit common cases. The adjustment to remove wrap_offset |
| is done by the caller. */ |
| /* 1. prompt string */ |
| if (flags && start == 0 && end == local_prompt_len && memcmp (str, local_prompt, local_prompt_len) == 0) |
| return (prompt_physical_chars + wrap_offset); |
| /* 2. prompt string + line contents */ |
| else if (flags && start == 0 && local_prompt_len > 0 && end > local_prompt_len && local_prompt && memcmp (str, local_prompt, local_prompt_len) == 0) |
| { |
| tmp = prompt_physical_chars + wrap_offset; |
| /* XXX - try to call ourselves recursively with non-prompt portion */ |
| tmp += _rl_col_width (str, local_prompt_len, end, flags); |
| return (tmp); |
| } |
| |
| while (point < start) |
| { |
| tmp = mbrlen (str + point, max, &ps); |
| if (MB_INVALIDCH ((size_t)tmp)) |
| { |
| /* In this case, the bytes are invalid or too short to compose a |
| multibyte character, so we assume that the first byte represents |
| a single character. */ |
| point++; |
| max--; |
| |
| /* Clear the state of the byte sequence, because in this case the |
| effect of mbstate is undefined. */ |
| memset (&ps, 0, sizeof (mbstate_t)); |
| } |
| else if (MB_NULLWCH (tmp)) |
| break; /* Found '\0' */ |
| else |
| { |
| point += tmp; |
| max -= tmp; |
| } |
| } |
| |
| /* If START is not a byte that starts a character, then POINT will be |
| greater than START. In this case, assume that (POINT - START) gives |
| a byte count that is the number of columns of difference. */ |
| width = point - start; |
| |
| while (point < end) |
| { |
| tmp = mbrtowc (&wc, str + point, max, &ps); |
| if (MB_INVALIDCH ((size_t)tmp)) |
| { |
| /* In this case, the bytes are invalid or too short to compose a |
| multibyte character, so we assume that the first byte represents |
| a single character. */ |
| point++; |
| max--; |
| |
| /* and assume that the byte occupies a single column. */ |
| width++; |
| |
| /* Clear the state of the byte sequence, because in this case the |
| effect of mbstate is undefined. */ |
| memset (&ps, 0, sizeof (mbstate_t)); |
| } |
| else if (MB_NULLWCH (tmp)) |
| break; /* Found '\0' */ |
| else |
| { |
| point += tmp; |
| max -= tmp; |
| tmp = wcwidth(wc); |
| width += (tmp >= 0) ? tmp : 1; |
| } |
| } |
| |
| width += point - end; |
| |
| return width; |
| } |
| #endif /* HANDLE_MULTIBYTE */ |