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search.c revision 1.15 
      1 /*	$NetBSD: search.c,v 1.15 2003/08/07 16:44:33 agc 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 1.15 2003/08/07 16:44:33 agc 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 #if defined(REGEX)
     49 #include <regex.h>
     50 #elif defined(REGEXP)
     51 #include <regexp.h>
     52 #endif
     53 #include "el.h"
     54 
     55 /*
     56  * Adjust cursor in vi mode to include the character under it
     57  */
     58 #define	EL_CURSOR(el) \
     59     ((el)->el_line.cursor + (((el)->el_map.type == MAP_VI) && \
     60 			    ((el)->el_map.current == (el)->el_map.alt)))
     61 
     62 /* search_init():
     63  *	Initialize the search stuff
     64  */
     65 protected int
     66 search_init(EditLine *el)
     67 {
     68 
     69 	el->el_search.patbuf = (char *) el_malloc(EL_BUFSIZ);
     70 	if (el->el_search.patbuf == NULL)
     71 		return (-1);
     72 	el->el_search.patlen = 0;
     73 	el->el_search.patdir = -1;
     74 	el->el_search.chacha = '\0';
     75 	el->el_search.chadir = CHAR_FWD;
     76 	el->el_search.chatflg = 0;
     77 	return (0);
     78 }
     79 
     80 
     81 /* search_end():
     82  *	Initialize the search stuff
     83  */
     84 protected void
     85 search_end(EditLine *el)
     86 {
     87 
     88 	el_free((ptr_t) el->el_search.patbuf);
     89 	el->el_search.patbuf = NULL;
     90 }
     91 
     92 
     93 #ifdef REGEXP
     94 /* regerror():
     95  *	Handle regular expression errors
     96  */
     97 public void
     98 /*ARGSUSED*/
     99 regerror(const char *msg)
    100 {
    101 }
    102 #endif
    103 
    104 
    105 /* el_match():
    106  *	Return if string matches pattern
    107  */
    108 protected int
    109 el_match(const char *str, const char *pat)
    110 {
    111 #if defined (REGEX)
    112 	regex_t re;
    113 	int rv;
    114 #elif defined (REGEXP)
    115 	regexp *rp;
    116 	int rv;
    117 #else
    118 	extern char	*re_comp(const char *);
    119 	extern int	 re_exec(const char *);
    120 #endif
    121 
    122 	if (strstr(str, pat) != NULL)
    123 		return (1);
    124 
    125 #if defined(REGEX)
    126 	if (regcomp(&re, pat, 0) == 0) {
    127 		rv = regexec(&re, str, 0, NULL, 0) == 0;
    128 		regfree(&re);
    129 	} else {
    130 		rv = 0;
    131 	}
    132 	return (rv);
    133 #elif defined(REGEXP)
    134 	if ((re = regcomp(pat)) != NULL) {
    135 		rv = regexec(re, str);
    136 		free((ptr_t) re);
    137 	} else {
    138 		rv = 0;
    139 	}
    140 	return (rv);
    141 #else
    142 	if (re_comp(pat) != NULL)
    143 		return (0);
    144 	else
    145 		return (re_exec(str) == 1);
    146 #endif
    147 }
    148 
    149 
    150 /* c_hmatch():
    151  *	 return True if the pattern matches the prefix
    152  */
    153 protected int
    154 c_hmatch(EditLine *el, const char *str)
    155 {
    156 #ifdef SDEBUG
    157 	(void) fprintf(el->el_errfile, "match `%s' with `%s'\n",
    158 	    el->el_search.patbuf, str);
    159 #endif /* SDEBUG */
    160 
    161 	return (el_match(str, el->el_search.patbuf));
    162 }
    163 
    164 
    165 /* c_setpat():
    166  *	Set the history seatch pattern
    167  */
    168 protected void
    169 c_setpat(EditLine *el)
    170 {
    171 	if (el->el_state.lastcmd != ED_SEARCH_PREV_HISTORY &&
    172 	    el->el_state.lastcmd != ED_SEARCH_NEXT_HISTORY) {
    173 		el->el_search.patlen = EL_CURSOR(el) - el->el_line.buffer;
    174 		if (el->el_search.patlen >= EL_BUFSIZ)
    175 			el->el_search.patlen = EL_BUFSIZ - 1;
    176 		if (el->el_search.patlen != 0) {
    177 			(void) strncpy(el->el_search.patbuf, el->el_line.buffer,
    178 			    el->el_search.patlen);
    179 			el->el_search.patbuf[el->el_search.patlen] = '\0';
    180 		} else
    181 			el->el_search.patlen = strlen(el->el_search.patbuf);
    182 	}
    183 #ifdef SDEBUG
    184 	(void) fprintf(el->el_errfile, "\neventno = %d\n",
    185 	    el->el_history.eventno);
    186 	(void) fprintf(el->el_errfile, "patlen = %d\n", el->el_search.patlen);
    187 	(void) fprintf(el->el_errfile, "patbuf = \"%s\"\n",
    188 	    el->el_search.patbuf);
    189 	(void) fprintf(el->el_errfile, "cursor %d lastchar %d\n",
    190 	    EL_CURSOR(el) - el->el_line.buffer,
    191 	    el->el_line.lastchar - el->el_line.buffer);
    192 #endif
    193 }
    194 
    195 
    196 /* ce_inc_search():
    197  *	Emacs incremental search
    198  */
    199 protected el_action_t
    200 ce_inc_search(EditLine *el, int dir)
    201 {
    202 	static const char STRfwd[] = {'f', 'w', 'd', '\0'},
    203 	     STRbck[] = {'b', 'c', 'k', '\0'};
    204 	static char pchar = ':';/* ':' = normal, '?' = failed */
    205 	static char endcmd[2] = {'\0', '\0'};
    206 	char ch, *ocursor = el->el_line.cursor, oldpchar = pchar;
    207 	const char *cp;
    208 
    209 	el_action_t ret = CC_NORM;
    210 
    211 	int ohisteventno = el->el_history.eventno;
    212 	int oldpatlen = el->el_search.patlen;
    213 	int newdir = dir;
    214 	int done, redo;
    215 
    216 	if (el->el_line.lastchar + sizeof(STRfwd) / sizeof(char) + 2 +
    217 	    el->el_search.patlen >= el->el_line.limit)
    218 		return (CC_ERROR);
    219 
    220 	for (;;) {
    221 
    222 		if (el->el_search.patlen == 0) {	/* first round */
    223 			pchar = ':';
    224 #ifdef ANCHOR
    225 			el->el_search.patbuf[el->el_search.patlen++] = '.';
    226 			el->el_search.patbuf[el->el_search.patlen++] = '*';
    227 #endif
    228 		}
    229 		done = redo = 0;
    230 		*el->el_line.lastchar++ = '\n';
    231 		for (cp = (newdir == ED_SEARCH_PREV_HISTORY) ? STRbck : STRfwd;
    232 		    *cp; *el->el_line.lastchar++ = *cp++)
    233 			continue;
    234 		*el->el_line.lastchar++ = pchar;
    235 		for (cp = &el->el_search.patbuf[1];
    236 		    cp < &el->el_search.patbuf[el->el_search.patlen];
    237 		    *el->el_line.lastchar++ = *cp++)
    238 			continue;
    239 		*el->el_line.lastchar = '\0';
    240 		re_refresh(el);
    241 
    242 		if (el_getc(el, &ch) != 1)
    243 			return (ed_end_of_file(el, 0));
    244 
    245 		switch (el->el_map.current[(unsigned char) ch]) {
    246 		case ED_INSERT:
    247 		case ED_DIGIT:
    248 			if (el->el_search.patlen > EL_BUFSIZ - 3)
    249 				term_beep(el);
    250 			else {
    251 				el->el_search.patbuf[el->el_search.patlen++] =
    252 				    ch;
    253 				*el->el_line.lastchar++ = ch;
    254 				*el->el_line.lastchar = '\0';
    255 				re_refresh(el);
    256 			}
    257 			break;
    258 
    259 		case EM_INC_SEARCH_NEXT:
    260 			newdir = ED_SEARCH_NEXT_HISTORY;
    261 			redo++;
    262 			break;
    263 
    264 		case EM_INC_SEARCH_PREV:
    265 			newdir = ED_SEARCH_PREV_HISTORY;
    266 			redo++;
    267 			break;
    268 
    269 		case ED_DELETE_PREV_CHAR:
    270 			if (el->el_search.patlen > 1)
    271 				done++;
    272 			else
    273 				term_beep(el);
    274 			break;
    275 
    276 		default:
    277 			switch (ch) {
    278 			case 0007:	/* ^G: Abort */
    279 				ret = CC_ERROR;
    280 				done++;
    281 				break;
    282 
    283 			case 0027:	/* ^W: Append word */
    284 			/* No can do if globbing characters in pattern */
    285 				for (cp = &el->el_search.patbuf[1];; cp++)
    286 				    if (cp >= &el->el_search.patbuf[el->el_search.patlen]) {
    287 					el->el_line.cursor +=
    288 					    el->el_search.patlen - 1;
    289 					cp = c__next_word(el->el_line.cursor,
    290 					    el->el_line.lastchar, 1,
    291 					    ce__isword);
    292 					while (el->el_line.cursor < cp &&
    293 					    *el->el_line.cursor != '\n') {
    294 						if (el->el_search.patlen >
    295 						    EL_BUFSIZ - 3) {
    296 							term_beep(el);
    297 							break;
    298 						}
    299 						el->el_search.patbuf[el->el_search.patlen++] =
    300 						    *el->el_line.cursor;
    301 						*el->el_line.lastchar++ =
    302 						    *el->el_line.cursor++;
    303 					}
    304 					el->el_line.cursor = ocursor;
    305 					*el->el_line.lastchar = '\0';
    306 					re_refresh(el);
    307 					break;
    308 				    } else if (isglob(*cp)) {
    309 					    term_beep(el);
    310 					    break;
    311 				    }
    312 				break;
    313 
    314 			default:	/* Terminate and execute cmd */
    315 				endcmd[0] = ch;
    316 				el_push(el, endcmd);
    317 				/* FALLTHROUGH */
    318 
    319 			case 0033:	/* ESC: Terminate */
    320 				ret = CC_REFRESH;
    321 				done++;
    322 				break;
    323 			}
    324 			break;
    325 		}
    326 
    327 		while (el->el_line.lastchar > el->el_line.buffer &&
    328 		    *el->el_line.lastchar != '\n')
    329 			*el->el_line.lastchar-- = '\0';
    330 		*el->el_line.lastchar = '\0';
    331 
    332 		if (!done) {
    333 
    334 			/* Can't search if unmatched '[' */
    335 			for (cp = &el->el_search.patbuf[el->el_search.patlen-1],
    336 			    ch = ']';
    337 			    cp > el->el_search.patbuf;
    338 			    cp--)
    339 				if (*cp == '[' || *cp == ']') {
    340 					ch = *cp;
    341 					break;
    342 				}
    343 			if (el->el_search.patlen > 1 && ch != '[') {
    344 				if (redo && newdir == dir) {
    345 					if (pchar == '?') { /* wrap around */
    346 						el->el_history.eventno =
    347 						    newdir == ED_SEARCH_PREV_HISTORY ? 0 : 0x7fffffff;
    348 						if (hist_get(el) == CC_ERROR)
    349 							/* el->el_history.event
    350 							 * no was fixed by
    351 							 * first call */
    352 							(void) hist_get(el);
    353 						el->el_line.cursor = newdir ==
    354 						    ED_SEARCH_PREV_HISTORY ?
    355 						    el->el_line.lastchar :
    356 						    el->el_line.buffer;
    357 					} else
    358 						el->el_line.cursor +=
    359 						    newdir ==
    360 						    ED_SEARCH_PREV_HISTORY ?
    361 						    -1 : 1;
    362 				}
    363 #ifdef ANCHOR
    364 				el->el_search.patbuf[el->el_search.patlen++] =
    365 				    '.';
    366 				el->el_search.patbuf[el->el_search.patlen++] =
    367 				    '*';
    368 #endif
    369 				el->el_search.patbuf[el->el_search.patlen] =
    370 				    '\0';
    371 				if (el->el_line.cursor < el->el_line.buffer ||
    372 				    el->el_line.cursor > el->el_line.lastchar ||
    373 				    (ret = ce_search_line(el,
    374 				    &el->el_search.patbuf[1],
    375 				    newdir)) == CC_ERROR) {
    376 					/* avoid c_setpat */
    377 					el->el_state.lastcmd =
    378 					    (el_action_t) newdir;
    379 					ret = newdir == ED_SEARCH_PREV_HISTORY ?
    380 					    ed_search_prev_history(el, 0) :
    381 					    ed_search_next_history(el, 0);
    382 					if (ret != CC_ERROR) {
    383 						el->el_line.cursor = newdir ==
    384 						    ED_SEARCH_PREV_HISTORY ?
    385 						    el->el_line.lastchar :
    386 						    el->el_line.buffer;
    387 						(void) ce_search_line(el,
    388 						    &el->el_search.patbuf[1],
    389 						    newdir);
    390 					}
    391 				}
    392 				el->el_search.patbuf[--el->el_search.patlen] =
    393 				    '\0';
    394 				if (ret == CC_ERROR) {
    395 					term_beep(el);
    396 					if (el->el_history.eventno !=
    397 					    ohisteventno) {
    398 						el->el_history.eventno =
    399 						    ohisteventno;
    400 						if (hist_get(el) == CC_ERROR)
    401 							return (CC_ERROR);
    402 					}
    403 					el->el_line.cursor = ocursor;
    404 					pchar = '?';
    405 				} else {
    406 					pchar = ':';
    407 				}
    408 			}
    409 			ret = ce_inc_search(el, newdir);
    410 
    411 			if (ret == CC_ERROR && pchar == '?' && oldpchar == ':')
    412 				/*
    413 				 * break abort of failed search at last
    414 				 * non-failed
    415 				 */
    416 				ret = CC_NORM;
    417 
    418 		}
    419 		if (ret == CC_NORM || (ret == CC_ERROR && oldpatlen == 0)) {
    420 			/* restore on normal return or error exit */
    421 			pchar = oldpchar;
    422 			el->el_search.patlen = oldpatlen;
    423 			if (el->el_history.eventno != ohisteventno) {
    424 				el->el_history.eventno = ohisteventno;
    425 				if (hist_get(el) == CC_ERROR)
    426 					return (CC_ERROR);
    427 			}
    428 			el->el_line.cursor = ocursor;
    429 			if (ret == CC_ERROR)
    430 				re_refresh(el);
    431 		}
    432 		if (done || ret != CC_NORM)
    433 			return (ret);
    434 	}
    435 }
    436 
    437 
    438 /* cv_search():
    439  *	Vi search.
    440  */
    441 protected el_action_t
    442 cv_search(EditLine *el, int dir)
    443 {
    444 	char ch;
    445 	char tmpbuf[EL_BUFSIZ];
    446 	int tmplen;
    447 
    448 #ifdef ANCHOR
    449 	tmpbuf[0] = '.';
    450 	tmpbuf[1] = '*';
    451 #define	LEN	2
    452 #else
    453 #define	LEN	0
    454 #endif
    455 	tmplen = LEN;
    456 
    457 	el->el_search.patdir = dir;
    458 
    459 	tmplen = c_gets(el, &tmpbuf[LEN],
    460 		dir == ED_SEARCH_PREV_HISTORY ? "\n/" : "\n?" );
    461 	if (tmplen == -1)
    462 		return CC_REFRESH;
    463 
    464 	tmplen += LEN;
    465 	ch = tmpbuf[tmplen];
    466 	tmpbuf[tmplen] = '\0';
    467 
    468 	if (tmplen == LEN) {
    469 		/*
    470 		 * Use the old pattern, but wild-card it.
    471 		 */
    472 		if (el->el_search.patlen == 0) {
    473 			re_refresh(el);
    474 			return (CC_ERROR);
    475 		}
    476 #ifdef ANCHOR
    477 		if (el->el_search.patbuf[0] != '.' &&
    478 		    el->el_search.patbuf[0] != '*') {
    479 			(void) strncpy(tmpbuf, el->el_search.patbuf,
    480 			    sizeof(tmpbuf) - 1);
    481 			el->el_search.patbuf[0] = '.';
    482 			el->el_search.patbuf[1] = '*';
    483 			(void) strncpy(&el->el_search.patbuf[2], tmpbuf,
    484 			    EL_BUFSIZ - 3);
    485 			el->el_search.patlen++;
    486 			el->el_search.patbuf[el->el_search.patlen++] = '.';
    487 			el->el_search.patbuf[el->el_search.patlen++] = '*';
    488 			el->el_search.patbuf[el->el_search.patlen] = '\0';
    489 		}
    490 #endif
    491 	} else {
    492 #ifdef ANCHOR
    493 		tmpbuf[tmplen++] = '.';
    494 		tmpbuf[tmplen++] = '*';
    495 #endif
    496 		tmpbuf[tmplen] = '\0';
    497 		(void) strncpy(el->el_search.patbuf, tmpbuf, EL_BUFSIZ - 1);
    498 		el->el_search.patlen = tmplen;
    499 	}
    500 	el->el_state.lastcmd = (el_action_t) dir;	/* avoid c_setpat */
    501 	el->el_line.cursor = el->el_line.lastchar = el->el_line.buffer;
    502 	if ((dir == ED_SEARCH_PREV_HISTORY ? ed_search_prev_history(el, 0) :
    503 	    ed_search_next_history(el, 0)) == CC_ERROR) {
    504 		re_refresh(el);
    505 		return (CC_ERROR);
    506 	}
    507 	if (ch == 0033) {
    508 		re_refresh(el);
    509 		return ed_newline(el, 0);
    510 	}
    511 	return (CC_REFRESH);
    512 }
    513 
    514 
    515 /* ce_search_line():
    516  *	Look for a pattern inside a line
    517  */
    518 protected el_action_t
    519 ce_search_line(EditLine *el, char *pattern, int dir)
    520 {
    521 	char *cp;
    522 
    523 	if (dir == ED_SEARCH_PREV_HISTORY) {
    524 		for (cp = el->el_line.cursor; cp >= el->el_line.buffer; cp--)
    525 			if (el_match(cp, pattern)) {
    526 				el->el_line.cursor = cp;
    527 				return (CC_NORM);
    528 			}
    529 		return (CC_ERROR);
    530 	} else {
    531 		for (cp = el->el_line.cursor; *cp != '\0' &&
    532 		    cp < el->el_line.limit; cp++)
    533 			if (el_match(cp, pattern)) {
    534 				el->el_line.cursor = cp;
    535 				return (CC_NORM);
    536 			}
    537 		return (CC_ERROR);
    538 	}
    539 }
    540 
    541 
    542 /* cv_repeat_srch():
    543  *	Vi repeat search
    544  */
    545 protected el_action_t
    546 cv_repeat_srch(EditLine *el, int c)
    547 {
    548 
    549 #ifdef SDEBUG
    550 	(void) fprintf(el->el_errfile, "dir %d patlen %d patbuf %s\n",
    551 	    c, el->el_search.patlen, el->el_search.patbuf);
    552 #endif
    553 
    554 	el->el_state.lastcmd = (el_action_t) c;	/* Hack to stop c_setpat */
    555 	el->el_line.lastchar = el->el_line.buffer;
    556 
    557 	switch (c) {
    558 	case ED_SEARCH_NEXT_HISTORY:
    559 		return (ed_search_next_history(el, 0));
    560 	case ED_SEARCH_PREV_HISTORY:
    561 		return (ed_search_prev_history(el, 0));
    562 	default:
    563 		return (CC_ERROR);
    564 	}
    565 }
    566 
    567 
    568 /* cv_csearch():
    569  *	Vi character search
    570  */
    571 protected el_action_t
    572 cv_csearch(EditLine *el, int direction, int ch, int count, int tflag)
    573 {
    574 	char *cp;
    575 
    576 	if (ch == 0)
    577 		return CC_ERROR;
    578 
    579 	if (ch == -1) {
    580 		char c;
    581 		if (el_getc(el, &c) != 1)
    582 			return ed_end_of_file(el, 0);
    583 		ch = c;
    584 	}
    585 
    586 	/* Save for ';' and ',' commands */
    587 	el->el_search.chacha = ch;
    588 	el->el_search.chadir = direction;
    589 	el->el_search.chatflg = tflag;
    590 
    591 	cp = el->el_line.cursor;
    592 	while (count--) {
    593 		if (*cp == ch)
    594 			cp += direction;
    595 		for (;;cp += direction) {
    596 			if (cp >= el->el_line.lastchar)
    597 				return CC_ERROR;
    598 			if (cp < el->el_line.buffer)
    599 				return CC_ERROR;
    600 			if (*cp == ch)
    601 				break;
    602 		}
    603 	}
    604 
    605 	if (tflag)
    606 		cp -= direction;
    607 
    608 	el->el_line.cursor = cp;
    609 
    610 	if (el->el_chared.c_vcmd.action != NOP) {
    611 		if (direction > 0)
    612 			el->el_line.cursor++;
    613 		cv_delfini(el);
    614 		return CC_REFRESH;
    615 	}
    616 	return CC_CURSOR;
    617 }
    618