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.
20 #define MINPOS(a,b) (((a) < (b)) ? (a) : (b))
21 #define MAXPOS(a,b) (((a) > (b)) ? (a) : (b))
23 #if HAVE_POSIX_REGCOMP
26 #define REGCOMP_FLAG REG_EXTENDED
28 #define REGCOMP_FLAG 0
50 extern int how_search;
54 extern int jump_sline;
57 extern int status_col;
58 extern void * constant ml_search;
59 extern POSITION start_attnpos;
60 extern POSITION end_attnpos;
62 extern int hilite_search;
63 extern int screen_trashed;
64 extern int size_linebuf;
66 extern int can_goto_line;
68 static int hide_hilite;
70 static POSITION prep_startpos;
71 static POSITION prep_endpos;
75 struct hilite *hl_next;
79 static struct hilite hilite_anchor = { NULL, NULL_POSITION, NULL_POSITION };
80 #define hl_first hl_next
84 * These are the static variables that represent the "remembered"
87 #if HAVE_POSIX_REGCOMP
88 static regex_t *regpattern = NULL;
91 pcre *regpattern = NULL;
97 static char *cpattern = NULL;
100 static struct regexp *regpattern = NULL;
103 static int is_caseless;
104 static int is_ucase_pattern;
105 static int last_search_type;
106 static char *last_pattern = NULL;
108 #define CVT_TO_LC 01 /* Convert upper-case to lower-case */
109 #define CVT_BS 02 /* Do backspace processing */
110 #define CVT_CRLF 04 /* Remove CR after LF */
111 #define CVT_ANSI 010 /* Remove ANSI escape sequences */
114 * Get the length of a buffer needed to convert a string.
123 * Just copying a string in UTF-8 mode can cause it to grow
125 * Six output bytes for one input byte is the worst case
126 * (and unfortunately is far more than is needed in any
127 * non-pathological situation, so this is very wasteful).
134 * Convert text. Perform one or more of these transformations:
137 cvt_text(odst, osrc, lenp, ops)
145 register char *src_end;
149 src_end = osrc + *lenp;
151 src_end = osrc + strlen(osrc);
153 for (src = osrc, dst = odst; src < src_end; )
155 ch = step_char(&src, +1, src_end);
156 if ((ops & CVT_TO_LC) && IS_UPPER(ch))
158 /* Convert uppercase to lowercase. */
159 put_wchar(&dst, TO_LOWER(ch));
160 } else if ((ops & CVT_BS) && ch == '\b' && dst > odst)
162 /* Delete backspace and preceding char. */
165 } while (dst > odst &&
166 !IS_ASCII_OCTET(*dst) && !IS_UTF8_LEAD(*dst));
167 } else if ((ops & CVT_ANSI) && IS_CSI_START(ch))
169 /* Skip to end of ANSI escape sequence. */
170 while (src + 1 != src_end)
171 if (!is_ansi_middle(*++src))
177 if ((ops & CVT_CRLF) && dst > odst && dst[-1] == '\r')
185 * Determine which conversions to perform.
191 if (is_caseless || bs_mode == BS_SPECIAL)
195 if (bs_mode == BS_SPECIAL)
197 if (bs_mode != BS_CONTROL)
199 } else if (bs_mode != BS_CONTROL)
203 if (ctldisp == OPT_ONPLUS)
209 * Are there any uppercase letters in this string?
215 char *str_end = str + strlen(str);
218 while (str < str_end)
220 ch = step_char(&str, +1, str_end);
228 * Is there a previous (remembered) search pattern?
233 if (last_search_type & SRCH_NO_REGEX)
234 return (last_pattern != NULL);
235 #if HAVE_POSIX_REGCOMP
236 return (regpattern != NULL);
239 return (regpattern != NULL);
242 return (re_pattern != 0);
245 return (cpattern != NULL);
248 return (regpattern != NULL);
251 return (last_pattern != NULL);
257 * Repaint the hilites currently displayed on the screen.
258 * Repaint each line which contains highlighted text.
259 * If on==0, force all hilites off.
268 int save_hide_hilite;
273 save_hide_hilite = hide_hilite;
284 hide_hilite = save_hide_hilite;
288 for (slinenum = TOP; slinenum < TOP + sc_height-1; slinenum++)
290 pos = position(slinenum);
291 if (pos == NULL_POSITION)
293 epos = position(slinenum+1);
296 * If any character in the line is highlighted,
299 * {{ This doesn't work -- if line is drawn with highlights
300 * which should be erased (e.g. toggle -i with status column),
301 * we must redraw the line even if it has no highlights.
302 * For now, just repaint every line. }}
304 if (is_hilited(pos, epos, 1, NULL))
307 (void) forw_line(pos);
314 hide_hilite = save_hide_hilite;
318 * Clear the attn hilite.
324 POSITION old_start_attnpos;
325 POSITION old_end_attnpos;
330 if (start_attnpos == NULL_POSITION)
332 old_start_attnpos = start_attnpos;
333 old_end_attnpos = end_attnpos;
334 start_attnpos = end_attnpos = NULL_POSITION;
344 for (slinenum = TOP; slinenum < TOP + sc_height-1; slinenum++)
346 pos = position(slinenum);
347 if (pos == NULL_POSITION)
349 epos = position(slinenum+1);
350 if (pos < old_end_attnpos &&
351 (epos == NULL_POSITION || epos > old_start_attnpos))
353 (void) forw_line(pos);
365 * Hide search string highlighting.
372 error("No previous regular expression", NULL_PARG);
376 hide_hilite = !hide_hilite;
382 * Compile a search pattern, for future use by match_pattern.
385 compile_pattern2(pattern, search_type)
389 if ((search_type & SRCH_NO_REGEX) == 0)
391 #if HAVE_POSIX_REGCOMP
392 regex_t *s = (regex_t *) ecalloc(1, sizeof(regex_t));
393 if (regcomp(s, pattern, REGCOMP_FLAG))
396 error("Invalid pattern", NULL_PARG);
399 if (regpattern != NULL)
405 const char *errstring;
408 comp = pcre_compile(pattern, 0,
409 &errstring, &erroffset, NULL);
412 parg.p_string = (char *) errstring;
420 if ((parg.p_string = re_comp(pattern)) != NULL)
429 if ((s = regcmp(pattern, 0)) == NULL)
431 error("Invalid pattern", NULL_PARG);
434 if (cpattern != NULL)
440 if ((s = regcomp(pattern)) == NULL)
443 * regcomp has already printed an error message
448 if (regpattern != NULL)
454 if (last_pattern != NULL)
456 last_pattern = (char *) calloc(1, strlen(pattern)+1);
457 if (last_pattern != NULL)
458 strcpy(last_pattern, pattern);
460 last_search_type = search_type;
465 * Like compile_pattern, but convert the pattern to lowercase if necessary.
468 compile_pattern(pattern, search_type)
475 if (caseless != OPT_ONPLUS)
476 cvt_pattern = pattern;
479 cvt_pattern = (char*) ecalloc(1, cvt_length(strlen(pattern), CVT_TO_LC));
480 cvt_text(cvt_pattern, pattern, (int *)NULL, CVT_TO_LC);
482 result = compile_pattern2(cvt_pattern, search_type);
483 if (cvt_pattern != pattern)
489 * Forget that we have a compiled pattern.
494 #if HAVE_POSIX_REGCOMP
495 if (regpattern != NULL)
500 if (regpattern != NULL)
501 pcre_free(regpattern);
508 if (cpattern != NULL)
513 if (regpattern != NULL)
521 * Perform a pattern match with the previously compiled pattern.
522 * Set sp and ep to the start and end of the matched string.
525 match_pattern(line, line_len, sp, ep, notbol)
534 if (last_search_type & SRCH_NO_REGEX)
535 return (match(last_pattern, strlen(last_pattern), line, line_len, sp, ep));
537 #if HAVE_POSIX_REGCOMP
540 int flags = (notbol) ? REG_NOTBOL : 0;
541 matched = !regexec(regpattern, line, 1, &rm, flags);
545 *sp = line + rm.rm_so;
546 *ep = line + rm.rm_eo;
555 int flags = (notbol) ? PCRE_NOTBOL : 0;
557 matched = pcre_exec(regpattern, NULL, line, line_len,
558 0, flags, ovector, 3) >= 0;
561 *sp = line + ovector[0];
562 *ep = line + ovector[1];
566 matched = (re_exec(line) == 1);
568 * re_exec doesn't seem to provide a way to get the matched string.
573 *ep = regex(cpattern, line);
574 matched = (*ep != NULL);
581 matched = regexec2(regpattern, line, notbol);
583 matched = regexec(regpattern, line);
587 *sp = regpattern->startp[0];
588 *ep = regpattern->endp[0];
591 matched = match(last_pattern, strlen(last_pattern), line, line_len, sp, ep);
598 * Clear the hilite list.
604 struct hilite *nexthl;
606 for (hl = hilite_anchor.hl_first; hl != NULL; hl = nexthl)
608 nexthl = hl->hl_next;
611 hilite_anchor.hl_first = NULL;
612 prep_startpos = prep_endpos = NULL_POSITION;
616 * Should any characters in a specified range be highlighted?
619 is_hilited_range(pos, epos)
626 * Look at each highlight and see if any part of it falls in the range.
628 for (hl = hilite_anchor.hl_first; hl != NULL; hl = hl->hl_next)
630 if (hl->hl_endpos > pos &&
631 (epos == NULL_POSITION || epos > hl->hl_startpos))
638 * Should any characters in a specified range be highlighted?
639 * If nohide is nonzero, don't consider hide_hilite.
642 is_hilited(pos, epos, nohide, p_matches)
650 if (p_matches != NULL)
654 start_attnpos != NULL_POSITION &&
656 (epos == NULL_POSITION || epos > start_attnpos))
658 * The attn line overlaps this range.
662 match = is_hilited_range(pos, epos);
666 if (p_matches != NULL)
668 * Report matches, even if we're hiding highlights.
672 if (hilite_search == 0)
674 * Not doing highlighting.
678 if (!nohide && hide_hilite)
680 * Highlighting is hidden.
688 * Add a new hilite to a hilite list.
691 add_hilite(anchor, hl)
692 struct hilite *anchor;
698 * Hilites are sorted in the list; find where new one belongs.
699 * Insert new one after ihl.
701 for (ihl = anchor; ihl->hl_next != NULL; ihl = ihl->hl_next)
703 if (ihl->hl_next->hl_startpos > hl->hl_startpos)
708 * Truncate hilite so it doesn't overlap any existing ones
709 * above and below it.
712 hl->hl_startpos = MAXPOS(hl->hl_startpos, ihl->hl_endpos);
713 if (ihl->hl_next != NULL)
714 hl->hl_endpos = MINPOS(hl->hl_endpos, ihl->hl_next->hl_startpos);
715 if (hl->hl_startpos >= hl->hl_endpos)
718 * Hilite was truncated out of existence.
723 hl->hl_next = ihl->hl_next;
728 * Adjust hl_startpos & hl_endpos to account for processing by cvt_text.
731 adj_hilite(anchor, linepos, cvt_ops)
732 struct hilite *anchor;
748 * The line was already scanned and hilites were added (in hilite_line).
749 * But it was assumed that each char position in the line
750 * correponds to one char position in the file.
751 * This may not be true if cvt_text modified the line.
752 * Get the raw line again. Look at each character.
754 (void) forw_raw_line(linepos, &line, &line_len);
755 line_end = line + line_len;
756 opos = npos = linepos;
757 hl = anchor->hl_first;
762 * See if we need to adjust the current hl_startpos or
763 * hl_endpos. After adjusting startpos[i], move to endpos[i].
764 * After adjusting endpos[i], move to startpos[i+1].
765 * The hilite list must be sorted thus:
766 * startpos[0] < endpos[0] <= startpos[1] < endpos[1] <= etc.
768 if (checkstart && hl->hl_startpos == opos)
770 hl->hl_startpos = npos;
772 continue; /* {{ not really necessary }} */
773 } else if (!checkstart && hl->hl_endpos == opos)
775 hl->hl_endpos = npos;
778 continue; /* {{ necessary }} */
780 if (line == line_end)
783 /* Get the next char from the line. */
785 ch = step_char(&line, +1, line_end);
786 ncwidth = line - oline;
789 /* Figure out how this char was processed by cvt_text. */
790 if ((cvt_ops & CVT_BS) && ch == '\b')
792 /* Skip the backspace and the following char. */
794 ch = step_char(&line, +1, line_end);
795 ncwidth = line - oline;
797 } else if ((cvt_ops & CVT_TO_LC) && IS_UPPER(ch))
799 /* Converted uppercase to lower.
800 * Note that this may have changed the number of bytes
801 * that the character occupies. */
804 put_wchar(&dst, TO_LOWER(ch));
806 } else if ((cvt_ops & CVT_ANSI) && IS_CSI_START(ch))
808 /* Skip to end of ANSI escape sequence. */
809 while (line < line_end)
812 if (!is_ansi_middle(*++line))
817 /* Ordinary unprocessed character. */
824 * Make a hilite for each string in a physical line which matches
825 * the current pattern.
826 * sp,ep delimit the first match already found.
829 hilite_line(linepos, line, line_len, sp, ep, cvt_ops)
838 char *line_end = line + line_len;
840 struct hilite hilites;
842 if (sp == NULL || ep == NULL)
845 * sp and ep delimit the first match in the line.
846 * Mark the corresponding file positions, then
847 * look for further matches and mark them.
848 * {{ This technique, of calling match_pattern on subsequent
849 * substrings of the line, may mark more than is correct
850 * if the pattern starts with "^". This bug is fixed
851 * for those regex functions that accept a notbol parameter
852 * (currently POSIX, PCRE and V8-with-regexec2). }}
856 * Put the hilites into a temporary list until they're adjusted.
858 hilites.hl_first = NULL;
863 * Assume that each char position in the "line"
864 * buffer corresponds to one char position in the file.
865 * This is not quite true; we need to adjust later.
867 hl = (struct hilite *) ecalloc(1, sizeof(struct hilite));
868 hl->hl_startpos = linepos + (sp-line);
869 hl->hl_endpos = linepos + (ep-line);
870 add_hilite(&hilites, hl);
873 * If we matched more than zero characters,
874 * move to the first char after the string we matched.
875 * If we matched zero, just move to the next char.
879 else if (searchp != line_end)
881 else /* end of line */
883 } while (match_pattern(searchp, line_end - searchp, &sp, &ep, 1));
886 * If there were backspaces in the original line, they
887 * were removed, and hl_startpos/hl_endpos are not correct.
888 * {{ This is very ugly. }}
890 adj_hilite(&hilites, linepos, cvt_ops);
893 * Now put the hilites into the real list.
895 while ((hl = hilites.hl_next) != NULL)
897 hilites.hl_next = hl->hl_next;
898 add_hilite(&hilite_anchor, hl);
904 * Change the caseless-ness of searches.
905 * Updates the internal search state to reflect a change in the -i flag.
910 if (!is_ucase_pattern)
912 * Pattern did not have uppercase.
913 * Just set the search caselessness to the global caselessness.
915 is_caseless = caseless;
918 * Pattern did have uppercase.
919 * Discard the pattern; we can't change search caselessness now.
926 * Find matching text which is currently on screen and highlight it.
931 struct scrpos scrpos;
934 if (scrpos.pos == NULL_POSITION)
936 prep_hilite(scrpos.pos, position(BOTTOM_PLUS_ONE), -1);
941 * Change highlighting parameters.
947 * Erase any highlights currently on screen.
952 if (hilite_search == OPT_ONPLUS)
954 * Display highlights.
961 * Figure out where to start a search.
964 search_pos(search_type)
973 * Start at the beginning (or end) of the file.
974 * The empty_screen() case is mainly for
975 * command line initiated searches;
976 * for example, "+/xyz" on the command line.
977 * Also for multi-file (SRCH_PAST_EOF) searches.
979 if (search_type & SRCH_FORW)
985 if (pos == NULL_POSITION)
987 (void) ch_end_seek();
996 * Search does not include current screen.
998 if (search_type & SRCH_FORW)
999 linenum = BOTTOM_PLUS_ONE;
1002 pos = position(linenum);
1006 * Search includes current screen.
1007 * It starts at the jump target (if searching backwards),
1008 * or at the jump target plus one (if forwards).
1010 linenum = adjsline(jump_sline);
1011 pos = position(linenum);
1012 if (search_type & SRCH_FORW)
1014 pos = forw_raw_line(pos, (char **)NULL, (int *)NULL);
1015 while (pos == NULL_POSITION)
1017 if (++linenum >= sc_height)
1019 pos = position(linenum);
1023 while (pos == NULL_POSITION)
1027 pos = position(linenum);
1035 * Search a subset of the file, specified by start/end position.
1038 search_range(pos, endpos, search_type, matches, maxlines, plinepos, pendpos)
1054 POSITION linepos, oldpos;
1056 linenum = find_linenum(pos);
1061 * Get lines until we find a matching one or until
1062 * we hit end-of-file (or beginning-of-file if we're
1063 * going backwards), or until we hit the end position.
1068 * A signal aborts the search.
1073 if ((endpos != NULL_POSITION && pos >= endpos) || maxlines == 0)
1076 * Reached end position without a match.
1078 if (pendpos != NULL)
1085 if (search_type & SRCH_FORW)
1088 * Read the next line, and save the
1089 * starting position of that line in linepos.
1092 pos = forw_raw_line(pos, &line, &line_len);
1098 * Read the previous line and save the
1099 * starting position of that line in linepos.
1101 pos = back_raw_line(pos, &line, &line_len);
1107 if (pos == NULL_POSITION)
1110 * Reached EOF/BOF without a match.
1112 if (pendpos != NULL)
1118 * If we're using line numbers, we might as well
1119 * remember the information we have now (the position
1120 * and line number of the current line).
1121 * Don't do it for every line because it slows down
1122 * the search. Remember the line number only if
1123 * we're "far" from the last place we remembered it.
1125 if (linenums && abs((int)(pos - oldpos)) > 1024)
1126 add_lnum(linenum, pos);
1130 * If it's a caseless search, convert the line to lowercase.
1131 * If we're doing backspace processing, delete backspaces.
1133 cvt_ops = get_cvt_ops();
1134 cline = calloc(1, cvt_length(line_len, cvt_ops));
1135 cvt_text(cline, line, &line_len, cvt_ops);
1138 * Test the next line to see if we have a match.
1139 * We are successful if we either want a match and got one,
1140 * or if we want a non-match and got one.
1142 line_match = match_pattern(cline, line_len, &sp, &ep, 0);
1143 line_match = (!(search_type & SRCH_NO_MATCH) && line_match) ||
1144 ((search_type & SRCH_NO_MATCH) && !line_match);
1153 if (search_type & SRCH_FIND_ALL)
1157 * We are supposed to find all matches in the range.
1158 * Just add the matches in this line to the
1159 * hilite list and keep searching.
1162 hilite_line(linepos, cline, line_len, sp, ep, cvt_ops);
1165 } else if (--matches <= 0)
1168 * Found the one match we're looking for.
1172 if (hilite_search == OPT_ON)
1175 * Clear the hilite list and add only
1176 * the matches in this one line.
1180 hilite_line(linepos, cline, line_len, sp, ep, cvt_ops);
1184 if (plinepos != NULL)
1185 *plinepos = linepos;
1192 * search for a pattern in history. If found, compile that pattern.
1195 hist_pattern(search_type)
1201 set_mlist(ml_search, 0);
1202 pattern = cmd_lastpattern();
1203 if (pattern == NULL)
1206 if (compile_pattern(pattern, search_type) < 0)
1209 is_ucase_pattern = is_ucase(pattern);
1210 if (is_ucase_pattern && caseless != OPT_ONPLUS)
1213 is_caseless = caseless;
1216 if (hilite_search == OPT_ONPLUS && !hide_hilite)
1221 #else /* CMD_HISTORY */
1223 #endif /* CMD_HISTORY */
1227 * Search for the n-th occurrence of a specified pattern,
1228 * either forward or backward.
1229 * Return the number of matches not yet found in this file
1230 * (that is, n minus the number of matches found).
1231 * Return -1 if the search should be aborted.
1232 * Caller may continue the search in another file
1233 * if less than n matches are found in this file.
1236 search(search_type, pattern, n)
1244 if (pattern == NULL || *pattern == '\0')
1247 * A null pattern means use the previously compiled pattern.
1249 if (!prev_pattern() && !hist_pattern(search_type))
1251 error("No previous regular expression", NULL_PARG);
1254 if ((search_type & SRCH_NO_REGEX) !=
1255 (last_search_type & SRCH_NO_REGEX))
1257 error("Please re-enter search pattern", NULL_PARG);
1261 if (hilite_search == OPT_ON)
1264 * Erase the highlights currently on screen.
1265 * If the search fails, we'll redisplay them later.
1269 if (hilite_search == OPT_ONPLUS && hide_hilite)
1272 * Highlight any matches currently on screen,
1273 * before we actually start the search.
1283 * Compile the pattern.
1285 if (compile_pattern(pattern, search_type) < 0)
1288 * Ignore case if -I is set OR
1289 * -i is set AND the pattern is all lowercase.
1291 is_ucase_pattern = is_ucase(pattern);
1292 if (is_ucase_pattern && caseless != OPT_ONPLUS)
1295 is_caseless = caseless;
1300 * Erase the highlights currently on screen.
1301 * Also permanently delete them from the hilite list.
1307 if (hilite_search == OPT_ONPLUS)
1310 * Highlight any matches currently on screen,
1311 * before we actually start the search.
1319 * Figure out where to start the search.
1321 pos = search_pos(search_type);
1322 if (pos == NULL_POSITION)
1325 * Can't find anyplace to start searching from.
1327 if (search_type & SRCH_PAST_EOF)
1329 /* repaint(); -- why was this here? */
1330 error("Nothing to search", NULL_PARG);
1334 n = search_range(pos, NULL_POSITION, search_type, n, -1,
1335 &pos, (POSITION*)NULL);
1339 * Search was unsuccessful.
1342 if (hilite_search == OPT_ON && n > 0)
1344 * Redisplay old hilites.
1351 if (!(search_type & SRCH_NO_MOVE))
1354 * Go to the matching line.
1356 jump_loc(pos, jump_sline);
1360 if (hilite_search == OPT_ON)
1362 * Display new hilites in the matching line.
1372 * Prepare hilites in a given range of the file.
1374 * The pair (prep_startpos,prep_endpos) delimits a contiguous region
1375 * of the file that has been "prepared"; that is, scanned for matches for
1376 * the current search pattern, and hilites have been created for such matches.
1377 * If prep_startpos == NULL_POSITION, the prep region is empty.
1378 * If prep_endpos == NULL_POSITION, the prep region extends to EOF.
1379 * prep_hilite asks that the range (spos,epos) be covered by the prep region.
1382 prep_hilite(spos, epos, maxlines)
1387 POSITION nprep_startpos = prep_startpos;
1388 POSITION nprep_endpos = prep_endpos;
1394 * Search beyond where we're asked to search, so the prep region covers
1395 * more than we need. Do one big search instead of a bunch of small ones.
1397 #define SEARCH_MORE (3*size_linebuf)
1399 if (!prev_pattern())
1403 * If we're limited to a max number of lines, figure out the
1404 * file position we should stop at.
1407 max_epos = NULL_POSITION;
1411 for (i = 0; i < maxlines; i++)
1412 max_epos = forw_raw_line(max_epos, (char **)NULL, (int *)NULL);
1417 * The range that we need to search (spos,epos); and the range that
1418 * the "prep" region will then cover (nprep_startpos,nprep_endpos).
1421 if (prep_startpos == NULL_POSITION ||
1422 (epos != NULL_POSITION && epos < prep_startpos) ||
1426 * New range is not contiguous with old prep region.
1427 * Discard the old prep region and start a new one.
1430 if (epos != NULL_POSITION)
1431 epos += SEARCH_MORE;
1432 nprep_startpos = spos;
1436 * New range partially or completely overlaps old prep region.
1438 if (epos == NULL_POSITION)
1441 * New range goes to end of file.
1444 } else if (epos > prep_endpos)
1447 * New range ends after old prep region.
1448 * Extend prep region to end at end of new range.
1450 epos += SEARCH_MORE;
1451 } else /* (epos <= prep_endpos) */
1454 * New range ends within old prep region.
1455 * Truncate search to end at start of old prep region.
1457 epos = prep_startpos;
1460 if (spos < prep_startpos)
1463 * New range starts before old prep region.
1464 * Extend old prep region backwards to start at
1465 * start of new range.
1467 if (spos < SEARCH_MORE)
1470 spos -= SEARCH_MORE;
1471 nprep_startpos = spos;
1472 } else /* (spos >= prep_startpos) */
1475 * New range starts within or after old prep region.
1476 * Trim search to start at end of old prep region.
1482 if (epos != NULL_POSITION && max_epos != NULL_POSITION &&
1485 * Don't go past the max position we're allowed.
1489 if (epos == NULL_POSITION || epos > spos)
1491 result = search_range(spos, epos, SRCH_FORW|SRCH_FIND_ALL, 0,
1492 maxlines, (POSITION*)NULL, &new_epos);
1495 if (prep_endpos == NULL_POSITION || new_epos > prep_endpos)
1496 nprep_endpos = new_epos;
1498 prep_startpos = nprep_startpos;
1499 prep_endpos = nprep_endpos;
1504 * Simple pattern matching function.
1505 * It supports no metacharacters like *, etc.
1508 match(pattern, pattern_len, buf, buf_len, pfound, pend)
1513 char **pfound, **pend;
1515 register char *pp, *lp;
1516 register char *pattern_end = pattern + pattern_len;
1517 register char *buf_end = buf + buf_len;
1519 for ( ; buf < buf_end; buf++)
1521 for (pp = pattern, lp = buf; *pp == *lp; pp++, lp++)
1522 if (pp == pattern_end || lp == buf_end)
1524 if (pp == pattern_end)
1538 * This function is called by the V8 regcomp to report
1539 * errors in regular expressions.