1 /* $NetBSD: search.c,v 1.30 2011/10/04 15:27:04 christos Exp $ */
2
3 /*-
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Christos Zoulas of Cornell University.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include "config.h"
36 #if !defined(lint) && !defined(SCCSID)
37 #if 0
38 static char sccsid[] = "@(#)search.c 8.1 (Berkeley) 6/4/93";
39 #else
40 __RCSID("$NetBSD: search.c,v 1.30 2011/10/04 15:27:04 christos Exp $");
41 #endif
42 #endif /* not lint && not SCCSID */
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD$");
45
46 /*
47 * search.c: History and character search functions
48 */
49 #include <stdlib.h>
50 #if defined(REGEX)
51 #include <regex.h>
52 #elif defined(REGEXP)
53 #include <regexp.h>
54 #endif
55 #include "el.h"
56
57 /*
58 * Adjust cursor in vi mode to include the character under it
59 */
60 #define EL_CURSOR(el) \
61 ((el)->el_line.cursor + (((el)->el_map.type == MAP_VI) && \
62 ((el)->el_map.current == (el)->el_map.alt)))
63
64 /* search_init():
65 * Initialize the search stuff
66 */
67 protected int
search_init(EditLine * el)68 search_init(EditLine *el)
69 {
70
71 el->el_search.patbuf = el_malloc(EL_BUFSIZ *
72 sizeof(*el->el_search.patbuf));
73 if (el->el_search.patbuf == NULL)
74 return -1;
75 el->el_search.patlen = 0;
76 el->el_search.patdir = -1;
77 el->el_search.chacha = '\0';
78 el->el_search.chadir = CHAR_FWD;
79 el->el_search.chatflg = 0;
80 return 0;
81 }
82
83
84 /* search_end():
85 * Initialize the search stuff
86 */
87 protected void
search_end(EditLine * el)88 search_end(EditLine *el)
89 {
90
91 el_free(el->el_search.patbuf);
92 el->el_search.patbuf = NULL;
93 }
94
95
96 #ifdef REGEXP
97 /* regerror():
98 * Handle regular expression errors
99 */
100 public void
101 /*ARGSUSED*/
regerror(const char * msg)102 regerror(const char *msg)
103 {
104 }
105 #endif
106
107
108 /* el_match():
109 * Return if string matches pattern
110 */
111 protected int
el_match(const Char * str,const Char * pat)112 el_match(const Char *str, const Char *pat)
113 {
114 #ifdef WIDECHAR
115 static ct_buffer_t conv;
116 #endif
117 #if defined (REGEX)
118 regex_t re;
119 int rv;
120 #elif defined (REGEXP)
121 regexp *rp;
122 int rv;
123 #else
124 extern char *re_comp(const char *);
125 extern int re_exec(const char *);
126 #endif
127
128 if (Strstr(str, pat) != 0)
129 return 1;
130
131 #if defined(REGEX)
132 if (regcomp(&re, ct_encode_string(pat, &conv), 0) == 0) {
133 rv = regexec(&re, ct_encode_string(str, &conv), (size_t)0, NULL,
134 0) == 0;
135 regfree(&re);
136 } else {
137 rv = 0;
138 }
139 return rv;
140 #elif defined(REGEXP)
141 if ((re = regcomp(ct_encode_string(pat, &conv))) != NULL) {
142 rv = regexec(re, ct_encode_string(str, &conv));
143 el_free(re);
144 } else {
145 rv = 0;
146 }
147 return rv;
148 #else
149 if (re_comp(ct_encode_string(pat, &conv)) != NULL)
150 return 0;
151 else
152 return re_exec(ct_encode_string(str, &conv) == 1);
153 #endif
154 }
155
156
157 /* c_hmatch():
158 * return True if the pattern matches the prefix
159 */
160 protected int
c_hmatch(EditLine * el,const Char * str)161 c_hmatch(EditLine *el, const Char *str)
162 {
163 #ifdef SDEBUG
164 (void) fprintf(el->el_errfile, "match `%s' with `%s'\n",
165 el->el_search.patbuf, str);
166 #endif /* SDEBUG */
167
168 return el_match(str, el->el_search.patbuf);
169 }
170
171
172 /* c_setpat():
173 * Set the history seatch pattern
174 */
175 protected void
c_setpat(EditLine * el)176 c_setpat(EditLine *el)
177 {
178 if (el->el_state.lastcmd != ED_SEARCH_PREV_HISTORY &&
179 el->el_state.lastcmd != ED_SEARCH_NEXT_HISTORY) {
180 el->el_search.patlen =
181 (size_t)(EL_CURSOR(el) - el->el_line.buffer);
182 if (el->el_search.patlen >= EL_BUFSIZ)
183 el->el_search.patlen = EL_BUFSIZ - 1;
184 if (el->el_search.patlen != 0) {
185 (void) Strncpy(el->el_search.patbuf, el->el_line.buffer,
186 el->el_search.patlen);
187 el->el_search.patbuf[el->el_search.patlen] = '\0';
188 } else
189 el->el_search.patlen = Strlen(el->el_search.patbuf);
190 }
191 #ifdef SDEBUG
192 (void) fprintf(el->el_errfile, "\neventno = %d\n",
193 el->el_history.eventno);
194 (void) fprintf(el->el_errfile, "patlen = %d\n", el->el_search.patlen);
195 (void) fprintf(el->el_errfile, "patbuf = \"%s\"\n",
196 el->el_search.patbuf);
197 (void) fprintf(el->el_errfile, "cursor %d lastchar %d\n",
198 EL_CURSOR(el) - el->el_line.buffer,
199 el->el_line.lastchar - el->el_line.buffer);
200 #endif
201 }
202
203
204 /* ce_inc_search():
205 * Emacs incremental search
206 */
207 protected el_action_t
ce_inc_search(EditLine * el,int dir)208 ce_inc_search(EditLine *el, int dir)
209 {
210 static const Char STRfwd[] = {'f', 'w', 'd', '\0'},
211 STRbck[] = {'b', 'c', 'k', '\0'};
212 static Char pchar = ':';/* ':' = normal, '?' = failed */
213 static Char endcmd[2] = {'\0', '\0'};
214 Char ch, *ocursor = el->el_line.cursor, oldpchar = pchar;
215 const Char *cp;
216
217 el_action_t ret = CC_NORM;
218
219 int ohisteventno = el->el_history.eventno;
220 size_t oldpatlen = el->el_search.patlen;
221 int newdir = dir;
222 int done, redo;
223
224 if (el->el_line.lastchar + sizeof(STRfwd) /
225 sizeof(*el->el_line.lastchar) + 2 +
226 el->el_search.patlen >= el->el_line.limit)
227 return CC_ERROR;
228
229 for (;;) {
230
231 if (el->el_search.patlen == 0) { /* first round */
232 pchar = ':';
233 #ifdef ANCHOR
234 #define LEN 2
235 el->el_search.patbuf[el->el_search.patlen++] = '.';
236 el->el_search.patbuf[el->el_search.patlen++] = '*';
237 #else
238 #define LEN 0
239 #endif
240 }
241 done = redo = 0;
242 *el->el_line.lastchar++ = '\n';
243 for (cp = (newdir == ED_SEARCH_PREV_HISTORY) ? STRbck : STRfwd;
244 *cp; *el->el_line.lastchar++ = *cp++)
245 continue;
246 *el->el_line.lastchar++ = pchar;
247 for (cp = &el->el_search.patbuf[LEN];
248 cp < &el->el_search.patbuf[el->el_search.patlen];
249 *el->el_line.lastchar++ = *cp++)
250 continue;
251 *el->el_line.lastchar = '\0';
252 re_refresh(el);
253
254 if (FUN(el,getc)(el, &ch) != 1)
255 return ed_end_of_file(el, 0);
256
257 switch (el->el_map.current[(unsigned char) ch]) {
258 case ED_INSERT:
259 case ED_DIGIT:
260 if (el->el_search.patlen >= EL_BUFSIZ - LEN)
261 terminal_beep(el);
262 else {
263 el->el_search.patbuf[el->el_search.patlen++] =
264 ch;
265 *el->el_line.lastchar++ = ch;
266 *el->el_line.lastchar = '\0';
267 re_refresh(el);
268 }
269 break;
270
271 case EM_INC_SEARCH_NEXT:
272 newdir = ED_SEARCH_NEXT_HISTORY;
273 redo++;
274 break;
275
276 case EM_INC_SEARCH_PREV:
277 newdir = ED_SEARCH_PREV_HISTORY;
278 redo++;
279 break;
280
281 case EM_DELETE_PREV_CHAR:
282 case ED_DELETE_PREV_CHAR:
283 if (el->el_search.patlen > LEN)
284 done++;
285 else
286 terminal_beep(el);
287 break;
288
289 default:
290 switch (ch) {
291 case 0007: /* ^G: Abort */
292 ret = CC_ERROR;
293 done++;
294 break;
295
296 case 0027: /* ^W: Append word */
297 /* No can do if globbing characters in pattern */
298 for (cp = &el->el_search.patbuf[LEN];; cp++)
299 if (cp >= &el->el_search.patbuf[
300 el->el_search.patlen]) {
301 el->el_line.cursor +=
302 el->el_search.patlen - LEN - 1;
303 cp = c__next_word(el->el_line.cursor,
304 el->el_line.lastchar, 1,
305 ce__isword);
306 while (el->el_line.cursor < cp &&
307 *el->el_line.cursor != '\n') {
308 if (el->el_search.patlen >=
309 EL_BUFSIZ - LEN) {
310 terminal_beep(el);
311 break;
312 }
313 el->el_search.patbuf[el->el_search.patlen++] =
314 *el->el_line.cursor;
315 *el->el_line.lastchar++ =
316 *el->el_line.cursor++;
317 }
318 el->el_line.cursor = ocursor;
319 *el->el_line.lastchar = '\0';
320 re_refresh(el);
321 break;
322 } else if (isglob(*cp)) {
323 terminal_beep(el);
324 break;
325 }
326 break;
327
328 default: /* Terminate and execute cmd */
329 endcmd[0] = ch;
330 FUN(el,push)(el, endcmd);
331 /* FALLTHROUGH */
332
333 case 0033: /* ESC: Terminate */
334 ret = CC_REFRESH;
335 done++;
336 break;
337 }
338 break;
339 }
340
341 while (el->el_line.lastchar > el->el_line.buffer &&
342 *el->el_line.lastchar != '\n')
343 *el->el_line.lastchar-- = '\0';
344 *el->el_line.lastchar = '\0';
345
346 if (!done) {
347
348 /* Can't search if unmatched '[' */
349 for (cp = &el->el_search.patbuf[el->el_search.patlen-1],
350 ch = ']';
351 cp >= &el->el_search.patbuf[LEN];
352 cp--)
353 if (*cp == '[' || *cp == ']') {
354 ch = *cp;
355 break;
356 }
357 if (el->el_search.patlen > LEN && ch != '[') {
358 if (redo && newdir == dir) {
359 if (pchar == '?') { /* wrap around */
360 el->el_history.eventno =
361 newdir == ED_SEARCH_PREV_HISTORY ? 0 : 0x7fffffff;
362 if (hist_get(el) == CC_ERROR)
363 /* el->el_history.event
364 * no was fixed by
365 * first call */
366 (void) hist_get(el);
367 el->el_line.cursor = newdir ==
368 ED_SEARCH_PREV_HISTORY ?
369 el->el_line.lastchar :
370 el->el_line.buffer;
371 } else
372 el->el_line.cursor +=
373 newdir ==
374 ED_SEARCH_PREV_HISTORY ?
375 -1 : 1;
376 }
377 #ifdef ANCHOR
378 el->el_search.patbuf[el->el_search.patlen++] =
379 '.';
380 el->el_search.patbuf[el->el_search.patlen++] =
381 '*';
382 #endif
383 el->el_search.patbuf[el->el_search.patlen] =
384 '\0';
385 if (el->el_line.cursor < el->el_line.buffer ||
386 el->el_line.cursor > el->el_line.lastchar ||
387 (ret = ce_search_line(el, newdir))
388 == CC_ERROR) {
389 /* avoid c_setpat */
390 el->el_state.lastcmd =
391 (el_action_t) newdir;
392 ret = (el_action_t)
393 (newdir == ED_SEARCH_PREV_HISTORY ?
394 ed_search_prev_history(el, 0) :
395 ed_search_next_history(el, 0));
396 if (ret != CC_ERROR) {
397 el->el_line.cursor = newdir ==
398 ED_SEARCH_PREV_HISTORY ?
399 el->el_line.lastchar :
400 el->el_line.buffer;
401 (void) ce_search_line(el,
402 newdir);
403 }
404 }
405 el->el_search.patlen -= LEN;
406 el->el_search.patbuf[el->el_search.patlen] =
407 '\0';
408 if (ret == CC_ERROR) {
409 terminal_beep(el);
410 if (el->el_history.eventno !=
411 ohisteventno) {
412 el->el_history.eventno =
413 ohisteventno;
414 if (hist_get(el) == CC_ERROR)
415 return CC_ERROR;
416 }
417 el->el_line.cursor = ocursor;
418 pchar = '?';
419 } else {
420 pchar = ':';
421 }
422 }
423 ret = ce_inc_search(el, newdir);
424
425 if (ret == CC_ERROR && pchar == '?' && oldpchar == ':')
426 /*
427 * break abort of failed search at last
428 * non-failed
429 */
430 ret = CC_NORM;
431
432 }
433 if (ret == CC_NORM || (ret == CC_ERROR && oldpatlen == 0)) {
434 /* restore on normal return or error exit */
435 pchar = oldpchar;
436 el->el_search.patlen = oldpatlen;
437 if (el->el_history.eventno != ohisteventno) {
438 el->el_history.eventno = ohisteventno;
439 if (hist_get(el) == CC_ERROR)
440 return CC_ERROR;
441 }
442 el->el_line.cursor = ocursor;
443 if (ret == CC_ERROR)
444 re_refresh(el);
445 }
446 if (done || ret != CC_NORM)
447 return ret;
448 }
449 }
450
451
452 /* cv_search():
453 * Vi search.
454 */
455 protected el_action_t
cv_search(EditLine * el,int dir)456 cv_search(EditLine *el, int dir)
457 {
458 Char ch;
459 Char tmpbuf[EL_BUFSIZ];
460 ssize_t tmplen;
461
462 #ifdef ANCHOR
463 tmpbuf[0] = '.';
464 tmpbuf[1] = '*';
465 #endif
466 tmplen = LEN;
467
468 el->el_search.patdir = dir;
469
470 tmplen = c_gets(el, &tmpbuf[LEN],
471 dir == ED_SEARCH_PREV_HISTORY ? STR("\n/") : STR("\n?") );
472 if (tmplen == -1)
473 return CC_REFRESH;
474
475 tmplen += LEN;
476 ch = tmpbuf[tmplen];
477 tmpbuf[tmplen] = '\0';
478
479 if (tmplen == LEN) {
480 /*
481 * Use the old pattern, but wild-card it.
482 */
483 if (el->el_search.patlen == 0) {
484 re_refresh(el);
485 return CC_ERROR;
486 }
487 #ifdef ANCHOR
488 if (el->el_search.patbuf[0] != '.' &&
489 el->el_search.patbuf[0] != '*') {
490 (void) Strncpy(tmpbuf, el->el_search.patbuf,
491 sizeof(tmpbuf) / sizeof(*tmpbuf) - 1);
492 el->el_search.patbuf[0] = '.';
493 el->el_search.patbuf[1] = '*';
494 (void) Strncpy(&el->el_search.patbuf[2], tmpbuf,
495 EL_BUFSIZ - 3);
496 el->el_search.patlen++;
497 el->el_search.patbuf[el->el_search.patlen++] = '.';
498 el->el_search.patbuf[el->el_search.patlen++] = '*';
499 el->el_search.patbuf[el->el_search.patlen] = '\0';
500 }
501 #endif
502 } else {
503 #ifdef ANCHOR
504 tmpbuf[tmplen++] = '.';
505 tmpbuf[tmplen++] = '*';
506 #endif
507 tmpbuf[tmplen] = '\0';
508 (void) Strncpy(el->el_search.patbuf, tmpbuf, EL_BUFSIZ - 1);
509 el->el_search.patlen = (size_t)tmplen;
510 }
511 el->el_state.lastcmd = (el_action_t) dir; /* avoid c_setpat */
512 el->el_line.cursor = el->el_line.lastchar = el->el_line.buffer;
513 if ((dir == ED_SEARCH_PREV_HISTORY ? ed_search_prev_history(el, 0) :
514 ed_search_next_history(el, 0)) == CC_ERROR) {
515 re_refresh(el);
516 return CC_ERROR;
517 }
518 if (ch == 0033) {
519 re_refresh(el);
520 return ed_newline(el, 0);
521 }
522 return CC_REFRESH;
523 }
524
525
526 /* ce_search_line():
527 * Look for a pattern inside a line
528 */
529 protected el_action_t
ce_search_line(EditLine * el,int dir)530 ce_search_line(EditLine *el, int dir)
531 {
532 Char *cp = el->el_line.cursor;
533 Char *pattern = el->el_search.patbuf;
534 Char oc, *ocp;
535 #ifdef ANCHOR
536 ocp = &pattern[1];
537 oc = *ocp;
538 *ocp = '^';
539 #else
540 ocp = pattern;
541 oc = *ocp;
542 #endif
543
544 if (dir == ED_SEARCH_PREV_HISTORY) {
545 for (; cp >= el->el_line.buffer; cp--) {
546 if (el_match(cp, ocp)) {
547 *ocp = oc;
548 el->el_line.cursor = cp;
549 return CC_NORM;
550 }
551 }
552 *ocp = oc;
553 return CC_ERROR;
554 } else {
555 for (; *cp != '\0' && cp < el->el_line.limit; cp++) {
556 if (el_match(cp, ocp)) {
557 *ocp = oc;
558 el->el_line.cursor = cp;
559 return CC_NORM;
560 }
561 }
562 *ocp = oc;
563 return CC_ERROR;
564 }
565 }
566
567
568 /* cv_repeat_srch():
569 * Vi repeat search
570 */
571 protected el_action_t
cv_repeat_srch(EditLine * el,Int c)572 cv_repeat_srch(EditLine *el, Int c)
573 {
574
575 #ifdef SDEBUG
576 (void) fprintf(el->el_errfile, "dir %d patlen %d patbuf %s\n",
577 c, el->el_search.patlen, ct_encode_string(el->el_search.patbuf));
578 #endif
579
580 el->el_state.lastcmd = (el_action_t) c; /* Hack to stop c_setpat */
581 el->el_line.lastchar = el->el_line.buffer;
582
583 switch (c) {
584 case ED_SEARCH_NEXT_HISTORY:
585 return ed_search_next_history(el, 0);
586 case ED_SEARCH_PREV_HISTORY:
587 return ed_search_prev_history(el, 0);
588 default:
589 return CC_ERROR;
590 }
591 }
592
593
594 /* cv_csearch():
595 * Vi character search
596 */
597 protected el_action_t
cv_csearch(EditLine * el,int direction,Int ch,int count,int tflag)598 cv_csearch(EditLine *el, int direction, Int ch, int count, int tflag)
599 {
600 Char *cp;
601
602 if (ch == 0)
603 return CC_ERROR;
604
605 if (ch == (Int)-1) {
606 Char c;
607 if (FUN(el,getc)(el, &c) != 1)
608 return ed_end_of_file(el, 0);
609 ch = c;
610 }
611
612 /* Save for ';' and ',' commands */
613 el->el_search.chacha = ch;
614 el->el_search.chadir = direction;
615 el->el_search.chatflg = (char)tflag;
616
617 cp = el->el_line.cursor;
618 while (count--) {
619 if ((Int)*cp == ch)
620 cp += direction;
621 for (;;cp += direction) {
622 if (cp >= el->el_line.lastchar)
623 return CC_ERROR;
624 if (cp < el->el_line.buffer)
625 return CC_ERROR;
626 if ((Int)*cp == ch)
627 break;
628 }
629 }
630
631 if (tflag)
632 cp -= direction;
633
634 el->el_line.cursor = cp;
635
636 if (el->el_chared.c_vcmd.action != NOP) {
637 if (direction > 0)
638 el->el_line.cursor++;
639 cv_delfini(el);
640 return CC_REFRESH;
641 }
642 return CC_CURSOR;
643 }
644