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.
121 if (utf_mode && (ops & CVT_TO_LC))
123 * Converting case can cause a UTF-8 string to increase in length.
124 * Multiplying by 3 is the worst case.
131 * Convert text. Perform one or more of these transformations:
134 cvt_text(odst, osrc, lenp, ops)
142 register char *src_end;
146 src_end = osrc + *lenp;
148 src_end = osrc + strlen(osrc);
150 for (src = osrc, dst = odst; src < src_end; )
152 ch = step_char(&src, +1, src_end);
153 if ((ops & CVT_TO_LC) && IS_UPPER(ch))
155 /* Convert uppercase to lowercase. */
156 put_wchar(&dst, TO_LOWER(ch));
157 } else if ((ops & CVT_BS) && ch == '\b' && dst > odst)
159 /* Delete backspace and preceding char. */
162 } while (dst > odst &&
163 !IS_ASCII_OCTET(*dst) && !IS_UTF8_LEAD(*dst));
164 } else if ((ops & CVT_ANSI) && IS_CSI_START(ch))
166 /* Skip to end of ANSI escape sequence. */
167 while (src + 1 != src_end)
168 if (!is_ansi_middle(*++src))
174 if ((ops & CVT_CRLF) && dst > odst && dst[-1] == '\r')
182 * Determine which conversions to perform.
188 if (is_caseless || bs_mode == BS_SPECIAL)
192 if (bs_mode == BS_SPECIAL)
194 if (bs_mode != BS_CONTROL)
196 } else if (bs_mode != BS_CONTROL)
200 if (ctldisp == OPT_ONPLUS)
206 * Are there any uppercase letters in this string?
212 char *str_end = str + strlen(str);
215 while (str < str_end)
217 ch = step_char(&str, +1, str_end);
225 * Is there a previous (remembered) search pattern?
230 if (last_search_type & SRCH_NO_REGEX)
231 return (last_pattern != NULL);
232 #if HAVE_POSIX_REGCOMP
233 return (regpattern != NULL);
236 return (regpattern != NULL);
239 return (re_pattern != 0);
242 return (cpattern != NULL);
245 return (regpattern != NULL);
248 return (last_pattern != NULL);
254 * Repaint the hilites currently displayed on the screen.
255 * Repaint each line which contains highlighted text.
256 * If on==0, force all hilites off.
265 int save_hide_hilite;
270 save_hide_hilite = hide_hilite;
281 hide_hilite = save_hide_hilite;
285 for (slinenum = TOP; slinenum < TOP + sc_height-1; slinenum++)
287 pos = position(slinenum);
288 if (pos == NULL_POSITION)
290 epos = position(slinenum+1);
293 * If any character in the line is highlighted,
296 * {{ This doesn't work -- if line is drawn with highlights
297 * which should be erased (e.g. toggle -i with status column),
298 * we must redraw the line even if it has no highlights.
299 * For now, just repaint every line. }}
301 if (is_hilited(pos, epos, 1, NULL))
304 (void) forw_line(pos);
311 hide_hilite = save_hide_hilite;
315 * Clear the attn hilite.
321 POSITION old_start_attnpos;
322 POSITION old_end_attnpos;
327 if (start_attnpos == NULL_POSITION)
329 old_start_attnpos = start_attnpos;
330 old_end_attnpos = end_attnpos;
331 start_attnpos = end_attnpos = NULL_POSITION;
341 for (slinenum = TOP; slinenum < TOP + sc_height-1; slinenum++)
343 pos = position(slinenum);
344 if (pos == NULL_POSITION)
346 epos = position(slinenum+1);
347 if (pos < old_end_attnpos &&
348 (epos == NULL_POSITION || epos > old_start_attnpos))
350 (void) forw_line(pos);
362 * Hide search string highlighting.
369 error("No previous regular expression", NULL_PARG);
373 hide_hilite = !hide_hilite;
379 * Compile a search pattern, for future use by match_pattern.
382 compile_pattern2(pattern, search_type)
386 if ((search_type & SRCH_NO_REGEX) == 0)
388 #if HAVE_POSIX_REGCOMP
389 regex_t *s = (regex_t *) ecalloc(1, sizeof(regex_t));
390 if (regcomp(s, pattern, REGCOMP_FLAG))
393 error("Invalid pattern", NULL_PARG);
396 if (regpattern != NULL)
402 const char *errstring;
405 comp = pcre_compile(pattern, 0,
406 &errstring, &erroffset, NULL);
409 parg.p_string = (char *) errstring;
417 if ((parg.p_string = re_comp(pattern)) != NULL)
426 if ((s = regcmp(pattern, 0)) == NULL)
428 error("Invalid pattern", NULL_PARG);
431 if (cpattern != NULL)
437 if ((s = regcomp(pattern)) == NULL)
440 * regcomp has already printed an error message
445 if (regpattern != NULL)
451 if (last_pattern != NULL)
453 last_pattern = (char *) calloc(1, strlen(pattern)+1);
454 if (last_pattern != NULL)
455 strcpy(last_pattern, pattern);
457 last_search_type = search_type;
462 * Like compile_pattern, but convert the pattern to lowercase if necessary.
465 compile_pattern(pattern, search_type)
472 if (caseless != OPT_ONPLUS)
473 cvt_pattern = pattern;
476 cvt_pattern = (char*) ecalloc(1, cvt_length(strlen(pattern), CVT_TO_LC));
477 cvt_text(cvt_pattern, pattern, (int *)NULL, CVT_TO_LC);
479 result = compile_pattern2(cvt_pattern, search_type);
480 if (cvt_pattern != pattern)
486 * Forget that we have a compiled pattern.
491 #if HAVE_POSIX_REGCOMP
492 if (regpattern != NULL)
497 if (regpattern != NULL)
498 pcre_free(regpattern);
505 if (cpattern != NULL)
510 if (regpattern != NULL)
518 * Perform a pattern match with the previously compiled pattern.
519 * Set sp and ep to the start and end of the matched string.
522 match_pattern(line, line_len, sp, ep, notbol)
531 if (last_search_type & SRCH_NO_REGEX)
532 return (match(last_pattern, strlen(last_pattern), line, line_len, sp, ep));
534 #if HAVE_POSIX_REGCOMP
537 int flags = (notbol) ? REG_NOTBOL : 0;
538 matched = !regexec(regpattern, line, 1, &rm, flags);
542 *sp = line + rm.rm_so;
543 *ep = line + rm.rm_eo;
552 int flags = (notbol) ? PCRE_NOTBOL : 0;
554 matched = pcre_exec(regpattern, NULL, line, line_len,
555 0, flags, ovector, 3) >= 0;
558 *sp = line + ovector[0];
559 *ep = line + ovector[1];
563 matched = (re_exec(line) == 1);
565 * re_exec doesn't seem to provide a way to get the matched string.
570 *ep = regex(cpattern, line);
571 matched = (*ep != NULL);
578 matched = regexec2(regpattern, line, notbol);
580 matched = regexec(regpattern, line);
584 *sp = regpattern->startp[0];
585 *ep = regpattern->endp[0];
588 matched = match(last_pattern, strlen(last_pattern), line, line_len, sp, ep);
595 * Clear the hilite list.
601 struct hilite *nexthl;
603 for (hl = hilite_anchor.hl_first; hl != NULL; hl = nexthl)
605 nexthl = hl->hl_next;
608 hilite_anchor.hl_first = NULL;
609 prep_startpos = prep_endpos = NULL_POSITION;
613 * Should any characters in a specified range be highlighted?
616 is_hilited_range(pos, epos)
623 * Look at each highlight and see if any part of it falls in the range.
625 for (hl = hilite_anchor.hl_first; hl != NULL; hl = hl->hl_next)
627 if (hl->hl_endpos > pos &&
628 (epos == NULL_POSITION || epos > hl->hl_startpos))
635 * Should any characters in a specified range be highlighted?
636 * If nohide is nonzero, don't consider hide_hilite.
639 is_hilited(pos, epos, nohide, p_matches)
647 if (p_matches != NULL)
651 start_attnpos != NULL_POSITION &&
653 (epos == NULL_POSITION || epos > start_attnpos))
655 * The attn line overlaps this range.
659 match = is_hilited_range(pos, epos);
663 if (p_matches != NULL)
665 * Report matches, even if we're hiding highlights.
669 if (hilite_search == 0)
671 * Not doing highlighting.
675 if (!nohide && hide_hilite)
677 * Highlighting is hidden.
685 * Add a new hilite to a hilite list.
688 add_hilite(anchor, hl)
689 struct hilite *anchor;
695 * Hilites are sorted in the list; find where new one belongs.
696 * Insert new one after ihl.
698 for (ihl = anchor; ihl->hl_next != NULL; ihl = ihl->hl_next)
700 if (ihl->hl_next->hl_startpos > hl->hl_startpos)
705 * Truncate hilite so it doesn't overlap any existing ones
706 * above and below it.
709 hl->hl_startpos = MAXPOS(hl->hl_startpos, ihl->hl_endpos);
710 if (ihl->hl_next != NULL)
711 hl->hl_endpos = MINPOS(hl->hl_endpos, ihl->hl_next->hl_startpos);
712 if (hl->hl_startpos >= hl->hl_endpos)
715 * Hilite was truncated out of existence.
720 hl->hl_next = ihl->hl_next;
725 * Adjust hl_startpos & hl_endpos to account for processing by cvt_text.
728 adj_hilite(anchor, linepos, cvt_ops)
729 struct hilite *anchor;
745 * The line was already scanned and hilites were added (in hilite_line).
746 * But it was assumed that each char position in the line
747 * correponds to one char position in the file.
748 * This may not be true if cvt_text modified the line.
749 * Get the raw line again. Look at each character.
751 (void) forw_raw_line(linepos, &line, &line_len);
752 line_end = line + line_len;
753 opos = npos = linepos;
754 hl = anchor->hl_first;
759 * See if we need to adjust the current hl_startpos or
760 * hl_endpos. After adjusting startpos[i], move to endpos[i].
761 * After adjusting endpos[i], move to startpos[i+1].
762 * The hilite list must be sorted thus:
763 * startpos[0] < endpos[0] <= startpos[1] < endpos[1] <= etc.
765 if (checkstart && hl->hl_startpos == opos)
767 hl->hl_startpos = npos;
769 continue; /* {{ not really necessary }} */
770 } else if (!checkstart && hl->hl_endpos == opos)
772 hl->hl_endpos = npos;
775 continue; /* {{ necessary }} */
777 if (line == line_end)
780 /* Get the next char from the line. */
782 ch = step_char(&line, +1, line_end);
783 ncwidth = line - oline;
786 /* Figure out how this char was processed by cvt_text. */
787 if ((cvt_ops & CVT_BS) && ch == '\b')
789 /* Skip the backspace and the following char. */
791 ch = step_char(&line, +1, line_end);
792 ncwidth = line - oline;
794 } else if ((cvt_ops & CVT_TO_LC) && IS_UPPER(ch))
796 /* Converted uppercase to lower.
797 * Note that this may have changed the number of bytes
798 * that the character occupies. */
801 put_wchar(&dst, TO_LOWER(ch));
803 } else if ((cvt_ops & CVT_ANSI) && IS_CSI_START(ch))
805 /* Skip to end of ANSI escape sequence. */
806 while (line < line_end)
809 if (!is_ansi_middle(*++line))
814 /* Ordinary unprocessed character. */
821 * Make a hilite for each string in a physical line which matches
822 * the current pattern.
823 * sp,ep delimit the first match already found.
826 hilite_line(linepos, line, line_len, sp, ep, cvt_ops)
835 char *line_end = line + line_len;
837 struct hilite hilites;
839 if (sp == NULL || ep == NULL)
842 * sp and ep delimit the first match in the line.
843 * Mark the corresponding file positions, then
844 * look for further matches and mark them.
845 * {{ This technique, of calling match_pattern on subsequent
846 * substrings of the line, may mark more than is correct
847 * if the pattern starts with "^". This bug is fixed
848 * for those regex functions that accept a notbol parameter
849 * (currently POSIX, PCRE and V8-with-regexec2). }}
853 * Put the hilites into a temporary list until they're adjusted.
855 hilites.hl_first = NULL;
860 * Assume that each char position in the "line"
861 * buffer corresponds to one char position in the file.
862 * This is not quite true; we need to adjust later.
864 hl = (struct hilite *) ecalloc(1, sizeof(struct hilite));
865 hl->hl_startpos = linepos + (sp-line);
866 hl->hl_endpos = linepos + (ep-line);
867 add_hilite(&hilites, hl);
870 * If we matched more than zero characters,
871 * move to the first char after the string we matched.
872 * If we matched zero, just move to the next char.
876 else if (searchp != line_end)
878 else /* end of line */
880 } while (match_pattern(searchp, line_end - searchp, &sp, &ep, 1));
883 * If there were backspaces in the original line, they
884 * were removed, and hl_startpos/hl_endpos are not correct.
885 * {{ This is very ugly. }}
887 adj_hilite(&hilites, linepos, cvt_ops);
890 * Now put the hilites into the real list.
892 while ((hl = hilites.hl_next) != NULL)
894 hilites.hl_next = hl->hl_next;
895 add_hilite(&hilite_anchor, hl);
901 * Change the caseless-ness of searches.
902 * Updates the internal search state to reflect a change in the -i flag.
907 if (!is_ucase_pattern)
909 * Pattern did not have uppercase.
910 * Just set the search caselessness to the global caselessness.
912 is_caseless = caseless;
915 * Pattern did have uppercase.
916 * Discard the pattern; we can't change search caselessness now.
923 * Find matching text which is currently on screen and highlight it.
928 struct scrpos scrpos;
931 if (scrpos.pos == NULL_POSITION)
933 prep_hilite(scrpos.pos, position(BOTTOM_PLUS_ONE), -1);
938 * Change highlighting parameters.
944 * Erase any highlights currently on screen.
949 if (hilite_search == OPT_ONPLUS)
951 * Display highlights.
958 * Figure out where to start a search.
961 search_pos(search_type)
970 * Start at the beginning (or end) of the file.
971 * The empty_screen() case is mainly for
972 * command line initiated searches;
973 * for example, "+/xyz" on the command line.
974 * Also for multi-file (SRCH_PAST_EOF) searches.
976 if (search_type & SRCH_FORW)
982 if (pos == NULL_POSITION)
984 (void) ch_end_seek();
993 * Search does not include current screen.
995 if (search_type & SRCH_FORW)
996 linenum = BOTTOM_PLUS_ONE;
999 pos = position(linenum);
1003 * Search includes current screen.
1004 * It starts at the jump target (if searching backwards),
1005 * or at the jump target plus one (if forwards).
1007 linenum = adjsline(jump_sline);
1008 pos = position(linenum);
1009 if (search_type & SRCH_FORW)
1011 pos = forw_raw_line(pos, (char **)NULL, (int *)NULL);
1012 while (pos == NULL_POSITION)
1014 if (++linenum >= sc_height)
1016 pos = position(linenum);
1020 while (pos == NULL_POSITION)
1024 pos = position(linenum);
1032 * Search a subset of the file, specified by start/end position.
1035 search_range(pos, endpos, search_type, matches, maxlines, plinepos, pendpos)
1051 POSITION linepos, oldpos;
1053 linenum = find_linenum(pos);
1058 * Get lines until we find a matching one or until
1059 * we hit end-of-file (or beginning-of-file if we're
1060 * going backwards), or until we hit the end position.
1065 * A signal aborts the search.
1070 if ((endpos != NULL_POSITION && pos >= endpos) || maxlines == 0)
1073 * Reached end position without a match.
1075 if (pendpos != NULL)
1082 if (search_type & SRCH_FORW)
1085 * Read the next line, and save the
1086 * starting position of that line in linepos.
1089 pos = forw_raw_line(pos, &line, &line_len);
1095 * Read the previous line and save the
1096 * starting position of that line in linepos.
1098 pos = back_raw_line(pos, &line, &line_len);
1104 if (pos == NULL_POSITION)
1107 * Reached EOF/BOF without a match.
1109 if (pendpos != NULL)
1115 * If we're using line numbers, we might as well
1116 * remember the information we have now (the position
1117 * and line number of the current line).
1118 * Don't do it for every line because it slows down
1119 * the search. Remember the line number only if
1120 * we're "far" from the last place we remembered it.
1122 if (linenums && abs((int)(pos - oldpos)) > 1024)
1123 add_lnum(linenum, pos);
1127 * If it's a caseless search, convert the line to lowercase.
1128 * If we're doing backspace processing, delete backspaces.
1130 cvt_ops = get_cvt_ops();
1131 cline = calloc(1, cvt_length(line_len, cvt_ops));
1132 cvt_text(cline, line, &line_len, cvt_ops);
1135 * Test the next line to see if we have a match.
1136 * We are successful if we either want a match and got one,
1137 * or if we want a non-match and got one.
1139 line_match = match_pattern(cline, line_len, &sp, &ep, 0);
1140 line_match = (!(search_type & SRCH_NO_MATCH) && line_match) ||
1141 ((search_type & SRCH_NO_MATCH) && !line_match);
1150 if (search_type & SRCH_FIND_ALL)
1154 * We are supposed to find all matches in the range.
1155 * Just add the matches in this line to the
1156 * hilite list and keep searching.
1159 hilite_line(linepos, cline, line_len, sp, ep, cvt_ops);
1162 } else if (--matches <= 0)
1165 * Found the one match we're looking for.
1169 if (hilite_search == OPT_ON)
1172 * Clear the hilite list and add only
1173 * the matches in this one line.
1177 hilite_line(linepos, cline, line_len, sp, ep, cvt_ops);
1181 if (plinepos != NULL)
1182 *plinepos = linepos;
1189 * search for a pattern in history. If found, compile that pattern.
1192 hist_pattern(search_type)
1198 set_mlist(ml_search, 0);
1199 pattern = cmd_lastpattern();
1200 if (pattern == NULL)
1203 if (compile_pattern(pattern, search_type) < 0)
1206 is_ucase_pattern = is_ucase(pattern);
1207 if (is_ucase_pattern && caseless != OPT_ONPLUS)
1210 is_caseless = caseless;
1213 if (hilite_search == OPT_ONPLUS && !hide_hilite)
1218 #else /* CMD_HISTORY */
1220 #endif /* CMD_HISTORY */
1224 * Search for the n-th occurrence of a specified pattern,
1225 * either forward or backward.
1226 * Return the number of matches not yet found in this file
1227 * (that is, n minus the number of matches found).
1228 * Return -1 if the search should be aborted.
1229 * Caller may continue the search in another file
1230 * if less than n matches are found in this file.
1233 search(search_type, pattern, n)
1241 if (pattern == NULL || *pattern == '\0')
1244 * A null pattern means use the previously compiled pattern.
1246 if (!prev_pattern() && !hist_pattern(search_type))
1248 error("No previous regular expression", NULL_PARG);
1251 if ((search_type & SRCH_NO_REGEX) !=
1252 (last_search_type & SRCH_NO_REGEX))
1254 error("Please re-enter search pattern", NULL_PARG);
1258 if (hilite_search == OPT_ON)
1261 * Erase the highlights currently on screen.
1262 * If the search fails, we'll redisplay them later.
1266 if (hilite_search == OPT_ONPLUS && hide_hilite)
1269 * Highlight any matches currently on screen,
1270 * before we actually start the search.
1280 * Compile the pattern.
1282 if (compile_pattern(pattern, search_type) < 0)
1285 * Ignore case if -I is set OR
1286 * -i is set AND the pattern is all lowercase.
1288 is_ucase_pattern = is_ucase(pattern);
1289 if (is_ucase_pattern && caseless != OPT_ONPLUS)
1292 is_caseless = caseless;
1297 * Erase the highlights currently on screen.
1298 * Also permanently delete them from the hilite list.
1304 if (hilite_search == OPT_ONPLUS)
1307 * Highlight any matches currently on screen,
1308 * before we actually start the search.
1316 * Figure out where to start the search.
1318 pos = search_pos(search_type);
1319 if (pos == NULL_POSITION)
1322 * Can't find anyplace to start searching from.
1324 if (search_type & SRCH_PAST_EOF)
1326 /* repaint(); -- why was this here? */
1327 error("Nothing to search", NULL_PARG);
1331 n = search_range(pos, NULL_POSITION, search_type, n, -1,
1332 &pos, (POSITION*)NULL);
1336 * Search was unsuccessful.
1339 if (hilite_search == OPT_ON && n > 0)
1341 * Redisplay old hilites.
1348 if (!(search_type & SRCH_NO_MOVE))
1351 * Go to the matching line.
1353 jump_loc(pos, jump_sline);
1357 if (hilite_search == OPT_ON)
1359 * Display new hilites in the matching line.
1369 * Prepare hilites in a given range of the file.
1371 * The pair (prep_startpos,prep_endpos) delimits a contiguous region
1372 * of the file that has been "prepared"; that is, scanned for matches for
1373 * the current search pattern, and hilites have been created for such matches.
1374 * If prep_startpos == NULL_POSITION, the prep region is empty.
1375 * If prep_endpos == NULL_POSITION, the prep region extends to EOF.
1376 * prep_hilite asks that the range (spos,epos) be covered by the prep region.
1379 prep_hilite(spos, epos, maxlines)
1384 POSITION nprep_startpos = prep_startpos;
1385 POSITION nprep_endpos = prep_endpos;
1391 * Search beyond where we're asked to search, so the prep region covers
1392 * more than we need. Do one big search instead of a bunch of small ones.
1394 #define SEARCH_MORE (3*size_linebuf)
1396 if (!prev_pattern())
1400 * If we're limited to a max number of lines, figure out the
1401 * file position we should stop at.
1404 max_epos = NULL_POSITION;
1408 for (i = 0; i < maxlines; i++)
1409 max_epos = forw_raw_line(max_epos, (char **)NULL, (int *)NULL);
1414 * The range that we need to search (spos,epos); and the range that
1415 * the "prep" region will then cover (nprep_startpos,nprep_endpos).
1418 if (prep_startpos == NULL_POSITION ||
1419 (epos != NULL_POSITION && epos < prep_startpos) ||
1423 * New range is not contiguous with old prep region.
1424 * Discard the old prep region and start a new one.
1427 if (epos != NULL_POSITION)
1428 epos += SEARCH_MORE;
1429 nprep_startpos = spos;
1433 * New range partially or completely overlaps old prep region.
1435 if (epos == NULL_POSITION)
1438 * New range goes to end of file.
1441 } else if (epos > prep_endpos)
1444 * New range ends after old prep region.
1445 * Extend prep region to end at end of new range.
1447 epos += SEARCH_MORE;
1448 } else /* (epos <= prep_endpos) */
1451 * New range ends within old prep region.
1452 * Truncate search to end at start of old prep region.
1454 epos = prep_startpos;
1457 if (spos < prep_startpos)
1460 * New range starts before old prep region.
1461 * Extend old prep region backwards to start at
1462 * start of new range.
1464 if (spos < SEARCH_MORE)
1467 spos -= SEARCH_MORE;
1468 nprep_startpos = spos;
1469 } else /* (spos >= prep_startpos) */
1472 * New range starts within or after old prep region.
1473 * Trim search to start at end of old prep region.
1479 if (epos != NULL_POSITION && max_epos != NULL_POSITION &&
1482 * Don't go past the max position we're allowed.
1486 if (epos == NULL_POSITION || epos > spos)
1488 result = search_range(spos, epos, SRCH_FORW|SRCH_FIND_ALL, 0,
1489 maxlines, (POSITION*)NULL, &new_epos);
1492 if (prep_endpos == NULL_POSITION || new_epos > prep_endpos)
1493 nprep_endpos = new_epos;
1495 prep_startpos = nprep_startpos;
1496 prep_endpos = nprep_endpos;
1501 * Simple pattern matching function.
1502 * It supports no metacharacters like *, etc.
1505 match(pattern, pattern_len, buf, buf_len, pfound, pend)
1510 char **pfound, **pend;
1512 register char *pp, *lp;
1513 register char *pattern_end = pattern + pattern_len;
1514 register char *buf_end = buf + buf_len;
1516 for ( ; buf < buf_end; buf++)
1518 for (pp = pattern, lp = buf; *pp == *lp; pp++, lp++)
1519 if (pp == pattern_end || lp == buf_end)
1521 if (pp == pattern_end)
1535 * This function is called by the V8 regcomp to report
1536 * errors in regular expressions.