1/*	$NetBSD: search.c,v 1.51 2020/03/30 06:56:38 ryo 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
38static char sccsid[] = "@(#)search.c	8.1 (Berkeley) 6/4/93";
39#else
40__RCSID("$NetBSD: search.c,v 1.51 2020/03/30 06:56:38 ryo Exp $");
41#endif
42#endif /* not lint && not SCCSID */
43
44/*
45 * search.c: History and character search functions
46 */
47#include <stdlib.h>
48#include <string.h>
49#if defined(REGEX)
50#include <regex.h>
51#elif defined(REGEXP)
52#include <regexp.h>
53#endif
54
55#include "el.h"
56#include "common.h"
57#include "fcns.h"
58
59/*
60 * Adjust cursor in vi mode to include the character under it
61 */
62#define	EL_CURSOR(el) \
63    ((el)->el_line.cursor + (((el)->el_map.type == MAP_VI) && \
64			    ((el)->el_map.current == (el)->el_map.alt)))
65
66/* search_init():
67 *	Initialize the search stuff
68 */
69libedit_private int
70search_init(EditLine *el)
71{
72
73	el->el_search.patbuf = el_calloc(EL_BUFSIZ,
74	    sizeof(*el->el_search.patbuf));
75	if (el->el_search.patbuf == NULL)
76		return -1;
77	el->el_search.patbuf[0] = L'\0';
78	el->el_search.patlen = 0;
79	el->el_search.patdir = -1;
80	el->el_search.chacha = L'\0';
81	el->el_search.chadir = CHAR_FWD;
82	el->el_search.chatflg = 0;
83	return 0;
84}
85
86
87/* search_end():
88 *	Initialize the search stuff
89 */
90libedit_private void
91search_end(EditLine *el)
92{
93
94	el_free(el->el_search.patbuf);
95	el->el_search.patbuf = NULL;
96}
97
98
99#ifdef REGEXP
100/* regerror():
101 *	Handle regular expression errors
102 */
103void
104/*ARGSUSED*/
105regerror(const char *msg)
106{
107}
108#endif
109
110
111/* el_match():
112 *	Return if string matches pattern
113 */
114libedit_private int
115el_match(const wchar_t *str, const wchar_t *pat)
116{
117	static ct_buffer_t conv;
118#if defined (REGEX)
119	regex_t re;
120	int rv;
121#elif defined (REGEXP)
122	regexp *rp;
123	int rv;
124#else
125	extern char	*re_comp(const char *);
126	extern int	 re_exec(const char *);
127#endif
128
129	if (wcsstr(str, pat) != 0)
130		return 1;
131
132#if defined(REGEX)
133	if (regcomp(&re, ct_encode_string(pat, &conv), 0) == 0) {
134		rv = regexec(&re, ct_encode_string(str, &conv), (size_t)0, NULL,
135		    0) == 0;
136		regfree(&re);
137	} else {
138		rv = 0;
139	}
140	return rv;
141#elif defined(REGEXP)
142	if ((re = regcomp(ct_encode_string(pat, &conv))) != NULL) {
143		rv = regexec(re, ct_encode_string(str, &conv));
144		el_free(re);
145	} else {
146		rv = 0;
147	}
148	return rv;
149#else
150	if (re_comp(ct_encode_string(pat, &conv)) != NULL)
151		return 0;
152	else
153		return re_exec(ct_encode_string(str, &conv)) == 1;
154#endif
155}
156
157
158/* c_hmatch():
159 *	 return True if the pattern matches the prefix
160 */
161libedit_private int
162c_hmatch(EditLine *el, const wchar_t *str)
163{
164#ifdef SDEBUG
165	(void) fprintf(el->el_errfile, "match `%ls' with `%ls'\n",
166	    el->el_search.patbuf, str);
167#endif /* SDEBUG */
168
169	return el_match(str, el->el_search.patbuf);
170}
171
172
173/* c_setpat():
174 *	Set the history seatch pattern
175 */
176libedit_private void
177c_setpat(EditLine *el)
178{
179	if (el->el_state.lastcmd != ED_SEARCH_PREV_HISTORY &&
180	    el->el_state.lastcmd != ED_SEARCH_NEXT_HISTORY) {
181		el->el_search.patlen =
182		    (size_t)(EL_CURSOR(el) - el->el_line.buffer);
183		if (el->el_search.patlen >= EL_BUFSIZ)
184			el->el_search.patlen = EL_BUFSIZ - 1;
185		(void) wcsncpy(el->el_search.patbuf, el->el_line.buffer,
186		    el->el_search.patlen);
187		el->el_search.patbuf[el->el_search.patlen] = '\0';
188	}
189#ifdef SDEBUG
190	(void) fprintf(el->el_errfile, "\neventno = %d\n",
191	    el->el_history.eventno);
192	(void) fprintf(el->el_errfile, "patlen = %ld\n", el->el_search.patlen);
193	(void) fprintf(el->el_errfile, "patbuf = \"%ls\"\n",
194	    el->el_search.patbuf);
195	(void) fprintf(el->el_errfile, "cursor %ld lastchar %ld\n",
196	    EL_CURSOR(el) - el->el_line.buffer,
197	    el->el_line.lastchar - el->el_line.buffer);
198#endif
199}
200
201
202/* ce_inc_search():
203 *	Emacs incremental search
204 */
205libedit_private el_action_t
206ce_inc_search(EditLine *el, int dir)
207{
208	static const wchar_t STRfwd[] = L"fwd", STRbck[] = L"bck";
209	static wchar_t pchar = L':';  /* ':' = normal, '?' = failed */
210	static wchar_t endcmd[2] = {'\0', '\0'};
211	wchar_t *ocursor = el->el_line.cursor, oldpchar = pchar, ch;
212	const wchar_t *cp;
213
214	el_action_t ret = CC_NORM;
215
216	int ohisteventno = el->el_history.eventno;
217	size_t oldpatlen = el->el_search.patlen;
218	int newdir = dir;
219	int done, redo;
220
221	if (el->el_line.lastchar + sizeof(STRfwd) /
222	    sizeof(*el->el_line.lastchar) + 2 +
223	    el->el_search.patlen >= el->el_line.limit)
224		return CC_ERROR;
225
226	for (;;) {
227
228		if (el->el_search.patlen == 0) {	/* first round */
229			pchar = ':';
230#ifdef ANCHOR
231#define	LEN	2
232			el->el_search.patbuf[el->el_search.patlen++] = '.';
233			el->el_search.patbuf[el->el_search.patlen++] = '*';
234#else
235#define	LEN	0
236#endif
237		}
238		done = redo = 0;
239		*el->el_line.lastchar++ = '\n';
240		for (cp = (newdir == ED_SEARCH_PREV_HISTORY) ? STRbck : STRfwd;
241		    *cp; *el->el_line.lastchar++ = *cp++)
242			continue;
243		*el->el_line.lastchar++ = pchar;
244		for (cp = &el->el_search.patbuf[LEN];
245		    cp < &el->el_search.patbuf[el->el_search.patlen];
246		    *el->el_line.lastchar++ = *cp++)
247			continue;
248		*el->el_line.lastchar = '\0';
249		re_refresh(el);
250
251		if (el_wgetc(el, &ch) != 1)
252			return ed_end_of_file(el, 0);
253
254		switch (el->el_map.current[(unsigned char) ch]) {
255		case ED_INSERT:
256		case ED_DIGIT:
257			if (el->el_search.patlen >= EL_BUFSIZ - LEN)
258				terminal_beep(el);
259			else {
260				el->el_search.patbuf[el->el_search.patlen++] =
261				    ch;
262				*el->el_line.lastchar++ = ch;
263				*el->el_line.lastchar = '\0';
264				re_refresh(el);
265			}
266			break;
267
268		case EM_INC_SEARCH_NEXT:
269			newdir = ED_SEARCH_NEXT_HISTORY;
270			redo++;
271			break;
272
273		case EM_INC_SEARCH_PREV:
274			newdir = ED_SEARCH_PREV_HISTORY;
275			redo++;
276			break;
277
278		case EM_DELETE_PREV_CHAR:
279		case ED_DELETE_PREV_CHAR:
280			if (el->el_search.patlen > LEN)
281				done++;
282			else
283				terminal_beep(el);
284			break;
285
286		default:
287			switch (ch) {
288			case 0007:	/* ^G: Abort */
289				ret = CC_ERROR;
290				done++;
291				break;
292
293			case 0027:	/* ^W: Append word */
294			/* No can do if globbing characters in pattern */
295				for (cp = &el->el_search.patbuf[LEN];; cp++)
296				    if (cp >= &el->el_search.patbuf[
297					el->el_search.patlen]) {
298					el->el_line.cursor +=
299					    el->el_search.patlen - LEN - 1;
300					cp = c__next_word(el->el_line.cursor,
301					    el->el_line.lastchar, 1,
302					    ce__isword);
303					while (el->el_line.cursor < cp &&
304					    *el->el_line.cursor != '\n') {
305						if (el->el_search.patlen >=
306						    EL_BUFSIZ - LEN) {
307							terminal_beep(el);
308							break;
309						}
310						el->el_search.patbuf[el->el_search.patlen++] =
311						    *el->el_line.cursor;
312						*el->el_line.lastchar++ =
313						    *el->el_line.cursor++;
314					}
315					el->el_line.cursor = ocursor;
316					*el->el_line.lastchar = '\0';
317					re_refresh(el);
318					break;
319				    } else if (isglob(*cp)) {
320					    terminal_beep(el);
321					    break;
322				    }
323				break;
324
325			default:	/* Terminate and execute cmd */
326				endcmd[0] = ch;
327				el_wpush(el, endcmd);
328				/* FALLTHROUGH */
329
330			case 0033:	/* ESC: Terminate */
331				ret = CC_REFRESH;
332				done++;
333				break;
334			}
335			break;
336		}
337
338		while (el->el_line.lastchar > el->el_line.buffer &&
339		    *el->el_line.lastchar != '\n')
340			*el->el_line.lastchar-- = '\0';
341		*el->el_line.lastchar = '\0';
342
343		if (!done) {
344
345			/* Can't search if unmatched '[' */
346			for (cp = &el->el_search.patbuf[el->el_search.patlen-1],
347			    ch = L']';
348			    cp >= &el->el_search.patbuf[LEN];
349			    cp--)
350				if (*cp == '[' || *cp == ']') {
351					ch = *cp;
352					break;
353				}
354			if (el->el_search.patlen > LEN && ch != L'[') {
355				if (redo && newdir == dir) {
356					if (pchar == '?') { /* wrap around */
357						el->el_history.eventno =
358						    newdir == ED_SEARCH_PREV_HISTORY ? 0 : 0x7fffffff;
359						if (hist_get(el) == CC_ERROR)
360							/* el->el_history.event
361							 * no was fixed by
362							 * first call */
363							(void) hist_get(el);
364						el->el_line.cursor = newdir ==
365						    ED_SEARCH_PREV_HISTORY ?
366						    el->el_line.lastchar :
367						    el->el_line.buffer;
368					} else
369						el->el_line.cursor +=
370						    newdir ==
371						    ED_SEARCH_PREV_HISTORY ?
372						    -1 : 1;
373				}
374#ifdef ANCHOR
375				el->el_search.patbuf[el->el_search.patlen++] =
376				    '.';
377				el->el_search.patbuf[el->el_search.patlen++] =
378				    '*';
379#endif
380				el->el_search.patbuf[el->el_search.patlen] =
381				    '\0';
382				if (el->el_line.cursor < el->el_line.buffer ||
383				    el->el_line.cursor > el->el_line.lastchar ||
384				    (ret = ce_search_line(el, newdir))
385				    == CC_ERROR) {
386					/* avoid c_setpat */
387					el->el_state.lastcmd =
388					    (el_action_t) newdir;
389					ret = (el_action_t)
390					    (newdir == ED_SEARCH_PREV_HISTORY ?
391					    ed_search_prev_history(el, 0) :
392					    ed_search_next_history(el, 0));
393					if (ret != CC_ERROR) {
394						el->el_line.cursor = newdir ==
395						    ED_SEARCH_PREV_HISTORY ?
396						    el->el_line.lastchar :
397						    el->el_line.buffer;
398						(void) ce_search_line(el,
399						    newdir);
400					}
401				}
402				el->el_search.patlen -= LEN;
403				el->el_search.patbuf[el->el_search.patlen] =
404				    '\0';
405				if (ret == CC_ERROR) {
406					terminal_beep(el);
407					if (el->el_history.eventno !=
408					    ohisteventno) {
409						el->el_history.eventno =
410						    ohisteventno;
411						if (hist_get(el) == CC_ERROR)
412							return CC_ERROR;
413					}
414					el->el_line.cursor = ocursor;
415					pchar = '?';
416				} else {
417					pchar = ':';
418				}
419			}
420			ret = ce_inc_search(el, newdir);
421
422			if (ret == CC_ERROR && pchar == '?' && oldpchar == ':')
423				/*
424				 * break abort of failed search at last
425				 * non-failed
426				 */
427				ret = CC_NORM;
428
429		}
430		if (ret == CC_NORM || (ret == CC_ERROR && oldpatlen == 0)) {
431			/* restore on normal return or error exit */
432			pchar = oldpchar;
433			el->el_search.patlen = oldpatlen;
434			if (el->el_history.eventno != ohisteventno) {
435				el->el_history.eventno = ohisteventno;
436				if (hist_get(el) == CC_ERROR)
437					return CC_ERROR;
438			}
439			el->el_line.cursor = ocursor;
440			if (ret == CC_ERROR)
441				re_refresh(el);
442		}
443		if (done || ret != CC_NORM)
444			return ret;
445	}
446}
447
448
449/* cv_search():
450 *	Vi search.
451 */
452libedit_private el_action_t
453cv_search(EditLine *el, int dir)
454{
455	wchar_t ch;
456	wchar_t tmpbuf[EL_BUFSIZ];
457	ssize_t tmplen;
458
459#ifdef ANCHOR
460	tmpbuf[0] = '.';
461	tmpbuf[1] = '*';
462#endif
463	tmplen = LEN;
464
465	el->el_search.patdir = dir;
466
467	tmplen = c_gets(el, &tmpbuf[LEN],
468		dir == ED_SEARCH_PREV_HISTORY ? L"\n/" : L"\n?" );
469	if (tmplen == -1)
470		return CC_REFRESH;
471
472	tmplen += LEN;
473	ch = tmpbuf[tmplen];
474	tmpbuf[tmplen] = '\0';
475
476	if (tmplen == LEN) {
477		/*
478		 * Use the old pattern, but wild-card it.
479		 */
480		if (el->el_search.patlen == 0) {
481			re_refresh(el);
482			return CC_ERROR;
483		}
484#ifdef ANCHOR
485		if (el->el_search.patbuf[0] != '.' &&
486		    el->el_search.patbuf[0] != '*') {
487			(void) wcsncpy(tmpbuf, el->el_search.patbuf,
488			    sizeof(tmpbuf) / sizeof(*tmpbuf) - 1);
489			el->el_search.patbuf[0] = '.';
490			el->el_search.patbuf[1] = '*';
491			(void) wcsncpy(&el->el_search.patbuf[2], tmpbuf,
492			    EL_BUFSIZ - 3);
493			el->el_search.patlen++;
494			el->el_search.patbuf[el->el_search.patlen++] = '.';
495			el->el_search.patbuf[el->el_search.patlen++] = '*';
496			el->el_search.patbuf[el->el_search.patlen] = '\0';
497		}
498#endif
499	} else {
500#ifdef ANCHOR
501		tmpbuf[tmplen++] = '.';
502		tmpbuf[tmplen++] = '*';
503#endif
504		tmpbuf[tmplen] = '\0';
505		(void) wcsncpy(el->el_search.patbuf, tmpbuf, EL_BUFSIZ - 1);
506		el->el_search.patlen = (size_t)tmplen;
507	}
508	el->el_state.lastcmd = (el_action_t) dir;	/* avoid c_setpat */
509	el->el_line.cursor = el->el_line.lastchar = el->el_line.buffer;
510	if ((dir == ED_SEARCH_PREV_HISTORY ? ed_search_prev_history(el, 0) :
511	    ed_search_next_history(el, 0)) == CC_ERROR) {
512		re_refresh(el);
513		return CC_ERROR;
514	}
515	if (ch == 0033) {
516		re_refresh(el);
517		return ed_newline(el, 0);
518	}
519	return CC_REFRESH;
520}
521
522
523/* ce_search_line():
524 *	Look for a pattern inside a line
525 */
526libedit_private el_action_t
527ce_search_line(EditLine *el, int dir)
528{
529	wchar_t *cp = el->el_line.cursor;
530	wchar_t *pattern = el->el_search.patbuf;
531	wchar_t oc, *ocp;
532#ifdef ANCHOR
533	ocp = &pattern[1];
534	oc = *ocp;
535	*ocp = '^';
536#else
537	ocp = pattern;
538	oc = *ocp;
539#endif
540
541	if (dir == ED_SEARCH_PREV_HISTORY) {
542		for (; cp >= el->el_line.buffer; cp--) {
543			if (el_match(cp, ocp)) {
544				*ocp = oc;
545				el->el_line.cursor = cp;
546				return CC_NORM;
547			}
548		}
549		*ocp = oc;
550		return CC_ERROR;
551	} else {
552		for (; *cp != '\0' && cp < el->el_line.limit; cp++) {
553			if (el_match(cp, ocp)) {
554				*ocp = oc;
555				el->el_line.cursor = cp;
556				return CC_NORM;
557			}
558		}
559		*ocp = oc;
560		return CC_ERROR;
561	}
562}
563
564
565/* cv_repeat_srch():
566 *	Vi repeat search
567 */
568libedit_private el_action_t
569cv_repeat_srch(EditLine *el, wint_t c)
570{
571
572#ifdef SDEBUG
573	static ct_buffer_t conv;
574	(void) fprintf(el->el_errfile, "dir %d patlen %ld patbuf %s\n",
575	    c, el->el_search.patlen, ct_encode_string(el->el_search.patbuf, &conv));
576#endif
577
578	el->el_state.lastcmd = (el_action_t) c;	/* Hack to stop c_setpat */
579	el->el_line.lastchar = el->el_line.buffer;
580
581	switch (c) {
582	case ED_SEARCH_NEXT_HISTORY:
583		return ed_search_next_history(el, 0);
584	case ED_SEARCH_PREV_HISTORY:
585		return ed_search_prev_history(el, 0);
586	default:
587		return CC_ERROR;
588	}
589}
590
591
592/* cv_csearch():
593 *	Vi character search
594 */
595libedit_private el_action_t
596cv_csearch(EditLine *el, int direction, wint_t ch, int count, int tflag)
597{
598	wchar_t *cp;
599
600	if (ch == 0)
601		return CC_ERROR;
602
603	if (ch == (wint_t)-1) {
604		wchar_t c;
605		if (el_wgetc(el, &c) != 1)
606			return ed_end_of_file(el, 0);
607		ch = c;
608	}
609
610	/* Save for ';' and ',' commands */
611	el->el_search.chacha = ch;
612	el->el_search.chadir = direction;
613	el->el_search.chatflg = (char)tflag;
614
615	cp = el->el_line.cursor;
616	while (count--) {
617		if ((wint_t)*cp == ch)
618			cp += direction;
619		for (;;cp += direction) {
620			if (cp >= el->el_line.lastchar)
621				return CC_ERROR;
622			if (cp < el->el_line.buffer)
623				return CC_ERROR;
624			if ((wint_t)*cp == ch)
625				break;
626		}
627	}
628
629	if (tflag)
630		cp -= direction;
631
632	el->el_line.cursor = cp;
633
634	if (el->el_chared.c_vcmd.action != NOP) {
635		if (direction > 0)
636			el->el_line.cursor++;
637		cv_delfini(el);
638		return CC_REFRESH;
639	}
640	return CC_CURSOR;
641}
642