1/*	$NetBSD: search.c,v 1.49 2019/07/23 10:18:52 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
38static char sccsid[] = "@(#)search.c	8.1 (Berkeley) 6/4/93";
39#else
40__RCSID("$NetBSD: search.c,v 1.49 2019/07/23 10:18:52 christos 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 `%s' with `%s'\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		if (el->el_search.patlen != 0) {
186			(void) wcsncpy(el->el_search.patbuf, el->el_line.buffer,
187			    el->el_search.patlen);
188			el->el_search.patbuf[el->el_search.patlen] = '\0';
189		} else
190			el->el_search.patlen = wcslen(el->el_search.patbuf);
191	}
192#ifdef SDEBUG
193	(void) fprintf(el->el_errfile, "\neventno = %d\n",
194	    el->el_history.eventno);
195	(void) fprintf(el->el_errfile, "patlen = %d\n", el->el_search.patlen);
196	(void) fprintf(el->el_errfile, "patbuf = \"%s\"\n",
197	    el->el_search.patbuf);
198	(void) fprintf(el->el_errfile, "cursor %d lastchar %d\n",
199	    EL_CURSOR(el) - el->el_line.buffer,
200	    el->el_line.lastchar - el->el_line.buffer);
201#endif
202}
203
204
205/* ce_inc_search():
206 *	Emacs incremental search
207 */
208libedit_private el_action_t
209ce_inc_search(EditLine *el, int dir)
210{
211	static const wchar_t STRfwd[] = L"fwd", STRbck[] = L"bck";
212	static wchar_t pchar = L':';  /* ':' = normal, '?' = failed */
213	static wchar_t endcmd[2] = {'\0', '\0'};
214	wchar_t *ocursor = el->el_line.cursor, oldpchar = pchar, ch;
215	const wchar_t *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 (el_wgetc(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				el_wpush(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 = L']';
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 != L'[') {
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 */
455libedit_private el_action_t
456cv_search(EditLine *el, int dir)
457{
458	wchar_t ch;
459	wchar_t 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 ? L"\n/" : L"\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) wcsncpy(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) wcsncpy(&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) wcsncpy(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 */
529libedit_private el_action_t
530ce_search_line(EditLine *el, int dir)
531{
532	wchar_t *cp = el->el_line.cursor;
533	wchar_t *pattern = el->el_search.patbuf;
534	wchar_t 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 */
571libedit_private el_action_t
572cv_repeat_srch(EditLine *el, wint_t 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 */
597libedit_private el_action_t
598cv_csearch(EditLine *el, int direction, wint_t ch, int count, int tflag)
599{
600	wchar_t *cp;
601
602	if (ch == 0)
603		return CC_ERROR;
604
605	if (ch == (wint_t)-1) {
606		wchar_t c;
607		if (el_wgetc(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 ((wint_t)*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 ((wint_t)*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