2 * Copyright (C) 1984-2007 Mark Nudelman
4 * You may distribute under the terms of either the GNU General Public
5 * License or the Less License, as specified in the README file.
7 * For more information about less, or for information on how to
8 * contact the author, see the README file.
13 * Routines to search a file for a pattern.
19 #define MINPOS(a,b) (((a) < (b)) ? (a) : (b))
20 #define MAXPOS(a,b) (((a) > (b)) ? (a) : (b))
22 #if HAVE_POSIX_REGCOMP
25 #define REGCOMP_FLAG REG_EXTENDED
27 #define REGCOMP_FLAG 0
49 extern int how_search;
53 extern int jump_sline;
56 extern int status_col;
57 extern void * constant ml_search;
58 extern POSITION start_attnpos;
59 extern POSITION end_attnpos;
61 extern int hilite_search;
62 extern int screen_trashed;
63 extern int size_linebuf;
65 extern int can_goto_line;
66 static int hide_hilite;
68 static POSITION prep_startpos;
69 static POSITION prep_endpos;
73 struct hilite *hl_next;
77 static struct hilite hilite_anchor = { NULL, NULL_POSITION, NULL_POSITION };
78 #define hl_first hl_next
82 * These are the static variables that represent the "remembered"
85 #if HAVE_POSIX_REGCOMP
86 static regex_t *regpattern = NULL;
89 pcre *regpattern = NULL;
95 static char *cpattern = NULL;
98 static struct regexp *regpattern = NULL;
101 static int is_caseless;
102 static int is_ucase_pattern;
103 static int last_search_type;
104 static char *last_pattern = NULL;
107 * Convert text. Perform one or more of these transformations:
109 #define CVT_TO_LC 01 /* Convert upper-case to lower-case */
110 #define CVT_BS 02 /* Do backspace processing */
111 #define CVT_CRLF 04 /* Remove CR after LF */
112 #define CVT_ANSI 010 /* Remove ANSI escape sequences */
115 cvt_text(odst, osrc, lenp, ops)
123 register char *src_end;
126 src_end = osrc + *lenp;
128 src_end = osrc + strlen(osrc);
130 for (src = osrc, dst = odst; src < src_end; src++)
132 if ((ops & CVT_TO_LC) && IS_UPPER(*src))
133 /* Convert uppercase to lowercase. */
134 *dst++ = TO_LOWER(*src);
135 else if ((ops & CVT_BS) && *src == '\b' && dst > odst)
136 /* Delete BS and preceding char. */
138 else if ((ops & CVT_ANSI) && *src == ESC)
140 /* Skip to end of ANSI escape sequence. */
141 while (src + 1 != src_end)
142 if (!is_ansi_middle(*++src))
148 if ((ops & CVT_CRLF) && dst > odst && dst[-1] == '\r')
156 * Determine which conversions to perform.
162 if (is_caseless || bs_mode == BS_SPECIAL)
166 if (bs_mode == BS_SPECIAL)
168 if (bs_mode != BS_CONTROL)
170 } else if (bs_mode != BS_CONTROL)
174 if (ctldisp == OPT_ONPLUS)
180 * Are there any uppercase letters in this string?
188 for (p = s; *p != '\0'; p++)
195 * Is there a previous (remembered) search pattern?
200 if (last_search_type & SRCH_NO_REGEX)
201 return (last_pattern != NULL);
202 #if HAVE_POSIX_REGCOMP
203 return (regpattern != NULL);
206 return (regpattern != NULL);
209 return (re_pattern != 0);
212 return (cpattern != NULL);
215 return (regpattern != NULL);
218 return (last_pattern != NULL);
224 * Repaint the hilites currently displayed on the screen.
225 * Repaint each line which contains highlighted text.
226 * If on==0, force all hilites off.
235 int save_hide_hilite;
240 save_hide_hilite = hide_hilite;
251 hide_hilite = save_hide_hilite;
255 for (slinenum = TOP; slinenum < TOP + sc_height-1; slinenum++)
257 pos = position(slinenum);
258 if (pos == NULL_POSITION)
260 epos = position(slinenum+1);
263 * If any character in the line is highlighted,
266 * {{ This doesn't work -- if line is drawn with highlights
267 * which should be erased (e.g. toggle -i with status column),
268 * we must redraw the line even if it has no highlights.
269 * For now, just repaint every line. }}
271 if (is_hilited(pos, epos, 1, NULL))
274 (void) forw_line(pos);
281 hide_hilite = save_hide_hilite;
285 * Clear the attn hilite.
291 POSITION old_start_attnpos;
292 POSITION old_end_attnpos;
296 if (start_attnpos == NULL_POSITION)
298 old_start_attnpos = start_attnpos;
299 old_end_attnpos = end_attnpos;
300 start_attnpos = end_attnpos = NULL_POSITION;
310 for (slinenum = TOP; slinenum < TOP + sc_height-1; slinenum++)
312 pos = position(slinenum);
313 if (pos == NULL_POSITION)
315 epos = position(slinenum+1);
316 if (pos < old_end_attnpos &&
317 (epos == NULL_POSITION || epos > old_start_attnpos))
319 (void) forw_line(pos);
328 * Hide search string highlighting.
335 error("No previous regular expression", NULL_PARG);
339 hide_hilite = !hide_hilite;
345 * Compile a search pattern, for future use by match_pattern.
348 compile_pattern(pattern, search_type)
352 if ((search_type & SRCH_NO_REGEX) == 0)
354 #if HAVE_POSIX_REGCOMP
355 regex_t *s = (regex_t *) ecalloc(1, sizeof(regex_t));
356 if (regcomp(s, pattern, REGCOMP_FLAG))
359 error("Invalid pattern", NULL_PARG);
362 if (regpattern != NULL)
368 const char *errstring;
371 comp = pcre_compile(pattern, 0,
372 &errstring, &erroffset, NULL);
375 parg.p_string = (char *) errstring;
383 if ((parg.p_string = re_comp(pattern)) != NULL)
392 if ((s = regcmp(pattern, 0)) == NULL)
394 error("Invalid pattern", NULL_PARG);
397 if (cpattern != NULL)
403 if ((s = regcomp(pattern)) == NULL)
406 * regcomp has already printed an error message
411 if (regpattern != NULL)
417 if (last_pattern != NULL)
419 last_pattern = (char *) calloc(1, strlen(pattern)+1);
420 if (last_pattern != NULL)
421 strcpy(last_pattern, pattern);
423 last_search_type = search_type;
428 * Forget that we have a compiled pattern.
433 #if HAVE_POSIX_REGCOMP
434 if (regpattern != NULL)
439 if (regpattern != NULL)
440 pcre_free(regpattern);
447 if (cpattern != NULL)
452 if (regpattern != NULL)
460 * Perform a pattern match with the previously compiled pattern.
461 * Set sp and ep to the start and end of the matched string.
464 match_pattern(line, line_len, sp, ep, notbol)
473 if (last_search_type & SRCH_NO_REGEX)
474 return (match(last_pattern, strlen(last_pattern), line, line_len, sp, ep));
476 #if HAVE_POSIX_REGCOMP
479 int flags = (notbol) ? REG_NOTBOL : 0;
480 matched = !regexec(regpattern, line, 1, &rm, flags);
484 *sp = line + rm.rm_so;
485 *ep = line + rm.rm_eo;
494 int flags = (notbol) ? PCRE_NOTBOL : 0;
496 matched = pcre_exec(regpattern, NULL, line, line_len,
497 0, flags, ovector, 3) >= 0;
500 *sp = line + ovector[0];
501 *ep = line + ovector[1];
505 matched = (re_exec(line) == 1);
507 * re_exec doesn't seem to provide a way to get the matched string.
512 *ep = regex(cpattern, line);
513 matched = (*ep != NULL);
520 matched = regexec2(regpattern, line, notbol);
522 matched = regexec(regpattern, line);
526 *sp = regpattern->startp[0];
527 *ep = regpattern->endp[0];
530 matched = match(last_pattern, strlen(last_pattern), line, line_len, sp, ep);
537 * Clear the hilite list.
543 struct hilite *nexthl;
545 for (hl = hilite_anchor.hl_first; hl != NULL; hl = nexthl)
547 nexthl = hl->hl_next;
550 hilite_anchor.hl_first = NULL;
551 prep_startpos = prep_endpos = NULL_POSITION;
555 * Should any characters in a specified range be highlighted?
558 is_hilited_range(pos, epos)
565 * Look at each highlight and see if any part of it falls in the range.
567 for (hl = hilite_anchor.hl_first; hl != NULL; hl = hl->hl_next)
569 if (hl->hl_endpos > pos &&
570 (epos == NULL_POSITION || epos > hl->hl_startpos))
577 * Should any characters in a specified range be highlighted?
578 * If nohide is nonzero, don't consider hide_hilite.
581 is_hilited(pos, epos, nohide, p_matches)
589 if (p_matches != NULL)
593 start_attnpos != NULL_POSITION &&
595 (epos == NULL_POSITION || epos > start_attnpos))
597 * The attn line overlaps this range.
601 match = is_hilited_range(pos, epos);
605 if (p_matches != NULL)
607 * Report matches, even if we're hiding highlights.
611 if (hilite_search == 0)
613 * Not doing highlighting.
617 if (!nohide && hide_hilite)
619 * Highlighting is hidden.
627 * Add a new hilite to a hilite list.
630 add_hilite(anchor, hl)
631 struct hilite *anchor;
637 * Hilites are sorted in the list; find where new one belongs.
638 * Insert new one after ihl.
640 for (ihl = anchor; ihl->hl_next != NULL; ihl = ihl->hl_next)
642 if (ihl->hl_next->hl_startpos > hl->hl_startpos)
647 * Truncate hilite so it doesn't overlap any existing ones
648 * above and below it.
651 hl->hl_startpos = MAXPOS(hl->hl_startpos, ihl->hl_endpos);
652 if (ihl->hl_next != NULL)
653 hl->hl_endpos = MINPOS(hl->hl_endpos, ihl->hl_next->hl_startpos);
654 if (hl->hl_startpos >= hl->hl_endpos)
657 * Hilite was truncated out of existence.
662 hl->hl_next = ihl->hl_next;
667 adj_hilite_ansi(cvt_ops, line, line_len, npos)
673 char *line_end = *line + line_len;
675 if (cvt_ops & CVT_ANSI)
676 while (**line == ESC)
679 * Found an ESC. The file position moves
680 * forward past the entire ANSI escape sequence.
684 while (*line < line_end)
687 if (!is_ansi_middle(*(*line)++))
694 * Adjust hl_startpos & hl_endpos to account for backspace processing.
697 adj_hilite(anchor, linepos, cvt_ops)
698 struct hilite *anchor;
711 * The line was already scanned and hilites were added (in hilite_line).
712 * But it was assumed that each char position in the line
713 * correponds to one char position in the file.
714 * This may not be true if there are backspaces in the line.
715 * Get the raw line again. Look at each character.
717 (void) forw_raw_line(linepos, &line, &line_len);
718 line_end = line + line_len;
719 opos = npos = linepos;
720 hl = anchor->hl_first;
725 * See if we need to adjust the current hl_startpos or
726 * hl_endpos. After adjusting startpos[i], move to endpos[i].
727 * After adjusting endpos[i], move to startpos[i+1].
728 * The hilite list must be sorted thus:
729 * startpos[0] < endpos[0] <= startpos[1] < endpos[1] <= etc.
731 if (checkstart && hl->hl_startpos == opos)
733 hl->hl_startpos = npos;
735 continue; /* {{ not really necessary }} */
736 } else if (!checkstart && hl->hl_endpos == opos)
738 hl->hl_endpos = npos;
741 continue; /* {{ necessary }} */
743 if (line == line_end)
745 adj_hilite_ansi(cvt_ops, &line, line_end - line, &npos);
749 if (cvt_ops & CVT_BS)
751 while (*line == '\b')
755 adj_hilite_ansi(cvt_ops, &line, line_end - line, &npos);
756 if (line == line_end)
763 * Found a backspace. The file position moves
764 * forward by 2 relative to the processed line
765 * which was searched in hilite_line.
775 * Make a hilite for each string in a physical line which matches
776 * the current pattern.
777 * sp,ep delimit the first match already found.
780 hilite_line(linepos, line, line_len, sp, ep, cvt_ops)
789 char *line_end = line + line_len;
791 struct hilite hilites;
793 if (sp == NULL || ep == NULL)
796 * sp and ep delimit the first match in the line.
797 * Mark the corresponding file positions, then
798 * look for further matches and mark them.
799 * {{ This technique, of calling match_pattern on subsequent
800 * substrings of the line, may mark more than is correct
801 * if the pattern starts with "^". This bug is fixed
802 * for those regex functions that accept a notbol parameter
803 * (currently POSIX, PCRE and V8-with-regexec2). }}
807 * Put the hilites into a temporary list until they're adjusted.
809 hilites.hl_first = NULL;
814 * Assume that each char position in the "line"
815 * buffer corresponds to one char position in the file.
816 * This is not quite true; we need to adjust later.
818 hl = (struct hilite *) ecalloc(1, sizeof(struct hilite));
819 hl->hl_startpos = linepos + (sp-line);
820 hl->hl_endpos = linepos + (ep-line);
821 add_hilite(&hilites, hl);
824 * If we matched more than zero characters,
825 * move to the first char after the string we matched.
826 * If we matched zero, just move to the next char.
830 else if (searchp != line_end)
832 else /* end of line */
834 } while (match_pattern(searchp, line_end - searchp, &sp, &ep, 1));
837 * If there were backspaces in the original line, they
838 * were removed, and hl_startpos/hl_endpos are not correct.
839 * {{ This is very ugly. }}
841 adj_hilite(&hilites, linepos, cvt_ops);
844 * Now put the hilites into the real list.
846 while ((hl = hilites.hl_next) != NULL)
848 hilites.hl_next = hl->hl_next;
849 add_hilite(&hilite_anchor, hl);
855 * Change the caseless-ness of searches.
856 * Updates the internal search state to reflect a change in the -i flag.
861 if (!is_ucase_pattern)
863 * Pattern did not have uppercase.
864 * Just set the search caselessness to the global caselessness.
866 is_caseless = caseless;
869 * Pattern did have uppercase.
870 * Discard the pattern; we can't change search caselessness now.
877 * Find matching text which is currently on screen and highlight it.
882 struct scrpos scrpos;
885 if (scrpos.pos == NULL_POSITION)
887 prep_hilite(scrpos.pos, position(BOTTOM_PLUS_ONE), -1);
892 * Change highlighting parameters.
898 * Erase any highlights currently on screen.
903 if (hilite_search == OPT_ONPLUS)
905 * Display highlights.
912 * Figure out where to start a search.
915 search_pos(search_type)
924 * Start at the beginning (or end) of the file.
925 * The empty_screen() case is mainly for
926 * command line initiated searches;
927 * for example, "+/xyz" on the command line.
928 * Also for multi-file (SRCH_PAST_EOF) searches.
930 if (search_type & SRCH_FORW)
936 if (pos == NULL_POSITION)
938 (void) ch_end_seek();
947 * Search does not include current screen.
949 if (search_type & SRCH_FORW)
950 linenum = BOTTOM_PLUS_ONE;
953 pos = position(linenum);
957 * Search includes current screen.
958 * It starts at the jump target (if searching backwards),
959 * or at the jump target plus one (if forwards).
961 linenum = adjsline(jump_sline);
962 pos = position(linenum);
963 if (search_type & SRCH_FORW)
965 pos = forw_raw_line(pos, (char **)NULL, (int *)NULL);
966 while (pos == NULL_POSITION)
968 if (++linenum >= sc_height)
970 pos = position(linenum);
974 while (pos == NULL_POSITION)
978 pos = position(linenum);
986 * Search a subset of the file, specified by start/end position.
989 search_range(pos, endpos, search_type, matches, maxlines, plinepos, pendpos)
1004 POSITION linepos, oldpos;
1006 linenum = find_linenum(pos);
1011 * Get lines until we find a matching one or until
1012 * we hit end-of-file (or beginning-of-file if we're
1013 * going backwards), or until we hit the end position.
1018 * A signal aborts the search.
1023 if ((endpos != NULL_POSITION && pos >= endpos) || maxlines == 0)
1026 * Reached end position without a match.
1028 if (pendpos != NULL)
1035 if (search_type & SRCH_FORW)
1038 * Read the next line, and save the
1039 * starting position of that line in linepos.
1042 pos = forw_raw_line(pos, &line, &line_len);
1048 * Read the previous line and save the
1049 * starting position of that line in linepos.
1051 pos = back_raw_line(pos, &line, &line_len);
1057 if (pos == NULL_POSITION)
1060 * Reached EOF/BOF without a match.
1062 if (pendpos != NULL)
1068 * If we're using line numbers, we might as well
1069 * remember the information we have now (the position
1070 * and line number of the current line).
1071 * Don't do it for every line because it slows down
1072 * the search. Remember the line number only if
1073 * we're "far" from the last place we remembered it.
1075 if (linenums && abs((int)(pos - oldpos)) > 1024)
1076 add_lnum(linenum, pos);
1080 * If it's a caseless search, convert the line to lowercase.
1081 * If we're doing backspace processing, delete backspaces.
1083 cvt_ops = get_cvt_ops();
1084 cvt_text(line, line, &line_len, cvt_ops);
1087 * Test the next line to see if we have a match.
1088 * We are successful if we either want a match and got one,
1089 * or if we want a non-match and got one.
1091 line_match = match_pattern(line, line_len, &sp, &ep, 0);
1092 line_match = (!(search_type & SRCH_NO_MATCH) && line_match) ||
1093 ((search_type & SRCH_NO_MATCH) && !line_match);
1099 if (search_type & SRCH_FIND_ALL)
1103 * We are supposed to find all matches in the range.
1104 * Just add the matches in this line to the
1105 * hilite list and keep searching.
1108 hilite_line(linepos, line, line_len, sp, ep, cvt_ops);
1110 } else if (--matches <= 0)
1113 * Found the one match we're looking for.
1117 if (hilite_search == OPT_ON)
1120 * Clear the hilite list and add only
1121 * the matches in this one line.
1125 hilite_line(linepos, line, line_len, sp, ep, cvt_ops);
1128 if (plinepos != NULL)
1129 *plinepos = linepos;
1136 * search for a pattern in history. If found, compile that pattern.
1139 hist_pattern(search_type)
1145 set_mlist(ml_search, 0);
1146 pattern = cmd_lastpattern();
1147 if (pattern == NULL)
1150 if (caseless == OPT_ONPLUS)
1151 cvt_text(pattern, pattern, (int *)NULL, CVT_TO_LC);
1153 if (compile_pattern(pattern, search_type) < 0)
1156 is_ucase_pattern = is_ucase(pattern);
1157 if (is_ucase_pattern && caseless != OPT_ONPLUS)
1160 is_caseless = caseless;
1163 if (hilite_search == OPT_ONPLUS && !hide_hilite)
1168 #else /* CMD_HISTORY */
1170 #endif /* CMD_HISTORY */
1174 * Search for the n-th occurrence of a specified pattern,
1175 * either forward or backward.
1176 * Return the number of matches not yet found in this file
1177 * (that is, n minus the number of matches found).
1178 * Return -1 if the search should be aborted.
1179 * Caller may continue the search in another file
1180 * if less than n matches are found in this file.
1183 search(search_type, pattern, n)
1191 if (pattern == NULL || *pattern == '\0')
1194 * A null pattern means use the previously compiled pattern.
1196 if (!prev_pattern() && !hist_pattern(search_type))
1198 error("No previous regular expression", NULL_PARG);
1201 if ((search_type & SRCH_NO_REGEX) !=
1202 (last_search_type & SRCH_NO_REGEX))
1204 error("Please re-enter search pattern", NULL_PARG);
1208 if (hilite_search == OPT_ON)
1211 * Erase the highlights currently on screen.
1212 * If the search fails, we'll redisplay them later.
1216 if (hilite_search == OPT_ONPLUS && hide_hilite)
1219 * Highlight any matches currently on screen,
1220 * before we actually start the search.
1230 * Compile the pattern.
1232 ucase = is_ucase(pattern);
1233 if (caseless == OPT_ONPLUS)
1234 cvt_text(pattern, pattern, (int *)NULL, CVT_TO_LC);
1235 if (compile_pattern(pattern, search_type) < 0)
1238 * Ignore case if -I is set OR
1239 * -i is set AND the pattern is all lowercase.
1241 is_ucase_pattern = ucase;
1242 if (is_ucase_pattern && caseless != OPT_ONPLUS)
1245 is_caseless = caseless;
1250 * Erase the highlights currently on screen.
1251 * Also permanently delete them from the hilite list.
1257 if (hilite_search == OPT_ONPLUS)
1260 * Highlight any matches currently on screen,
1261 * before we actually start the search.
1269 * Figure out where to start the search.
1271 pos = search_pos(search_type);
1272 if (pos == NULL_POSITION)
1275 * Can't find anyplace to start searching from.
1277 if (search_type & SRCH_PAST_EOF)
1279 /* repaint(); -- why was this here? */
1280 error("Nothing to search", NULL_PARG);
1284 n = search_range(pos, NULL_POSITION, search_type, n, -1,
1285 &pos, (POSITION*)NULL);
1289 * Search was unsuccessful.
1292 if (hilite_search == OPT_ON && n > 0)
1294 * Redisplay old hilites.
1301 if (!(search_type & SRCH_NO_MOVE))
1304 * Go to the matching line.
1306 jump_loc(pos, jump_sline);
1310 if (hilite_search == OPT_ON)
1312 * Display new hilites in the matching line.
1322 * Prepare hilites in a given range of the file.
1324 * The pair (prep_startpos,prep_endpos) delimits a contiguous region
1325 * of the file that has been "prepared"; that is, scanned for matches for
1326 * the current search pattern, and hilites have been created for such matches.
1327 * If prep_startpos == NULL_POSITION, the prep region is empty.
1328 * If prep_endpos == NULL_POSITION, the prep region extends to EOF.
1329 * prep_hilite asks that the range (spos,epos) be covered by the prep region.
1332 prep_hilite(spos, epos, maxlines)
1337 POSITION nprep_startpos = prep_startpos;
1338 POSITION nprep_endpos = prep_endpos;
1344 * Search beyond where we're asked to search, so the prep region covers
1345 * more than we need. Do one big search instead of a bunch of small ones.
1347 #define SEARCH_MORE (3*size_linebuf)
1349 if (!prev_pattern())
1353 * If we're limited to a max number of lines, figure out the
1354 * file position we should stop at.
1357 max_epos = NULL_POSITION;
1361 for (i = 0; i < maxlines; i++)
1362 max_epos = forw_raw_line(max_epos, (char **)NULL, (int *)NULL);
1367 * The range that we need to search (spos,epos); and the range that
1368 * the "prep" region will then cover (nprep_startpos,nprep_endpos).
1371 if (prep_startpos == NULL_POSITION ||
1372 (epos != NULL_POSITION && epos < prep_startpos) ||
1376 * New range is not contiguous with old prep region.
1377 * Discard the old prep region and start a new one.
1380 if (epos != NULL_POSITION)
1381 epos += SEARCH_MORE;
1382 nprep_startpos = spos;
1386 * New range partially or completely overlaps old prep region.
1388 if (epos == NULL_POSITION)
1391 * New range goes to end of file.
1394 } else if (epos > prep_endpos)
1397 * New range ends after old prep region.
1398 * Extend prep region to end at end of new range.
1400 epos += SEARCH_MORE;
1401 } else /* (epos <= prep_endpos) */
1404 * New range ends within old prep region.
1405 * Truncate search to end at start of old prep region.
1407 epos = prep_startpos;
1410 if (spos < prep_startpos)
1413 * New range starts before old prep region.
1414 * Extend old prep region backwards to start at
1415 * start of new range.
1417 if (spos < SEARCH_MORE)
1420 spos -= SEARCH_MORE;
1421 nprep_startpos = spos;
1422 } else /* (spos >= prep_startpos) */
1425 * New range starts within or after old prep region.
1426 * Trim search to start at end of old prep region.
1432 if (epos != NULL_POSITION && max_epos != NULL_POSITION &&
1435 * Don't go past the max position we're allowed.
1439 if (epos == NULL_POSITION || epos > spos)
1441 result = search_range(spos, epos, SRCH_FORW|SRCH_FIND_ALL, 0,
1442 maxlines, (POSITION*)NULL, &new_epos);
1445 if (prep_endpos == NULL_POSITION || new_epos > prep_endpos)
1446 nprep_endpos = new_epos;
1448 prep_startpos = nprep_startpos;
1449 prep_endpos = nprep_endpos;
1454 * Simple pattern matching function.
1455 * It supports no metacharacters like *, etc.
1458 match(pattern, pattern_len, buf, buf_len, pfound, pend)
1463 char **pfound, **pend;
1465 register char *pp, *lp;
1466 register char *pattern_end = pattern + pattern_len;
1467 register char *buf_end = buf + buf_len;
1469 for ( ; buf < buf_end; buf++)
1471 for (pp = pattern, lp = buf; *pp == *lp; pp++, lp++)
1472 if (pp == pattern_end || lp == buf_end)
1474 if (pp == pattern_end)
1488 * This function is called by the V8 regcomp to report
1489 * errors in regular expressions.