aboutsummaryrefslogtreecommitdiff
path: root/lib/libedit/filecomplete.c
blob: 54bf7d99ddfefa4e5ddf44032234e67f76f29f38 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
/*	$NetBSD: filecomplete.c,v 1.40 2016/02/17 19:47:49 christos Exp $	*/

/*-
 * Copyright (c) 1997 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jaromir Dolecek.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#if !defined(lint) && !defined(SCCSID)
__RCSID("$NetBSD: filecomplete.c,v 1.40 2016/02/17 19:47:49 christos Exp $");
#endif /* not lint && not SCCSID */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "el.h"
#include "filecomplete.h"

static const Char break_chars[] = { ' ', '\t', '\n', '"', '\\', '\'', '`', '@',
    '$', '>', '<', '=', ';', '|', '&', '{', '(', '\0' };
/* Tilde is deliberately omitted here, we treat it specially. */
static const Char extra_quote_chars[] = { ')', '}', '*', '?', '[', '$', '\0' };


/********************************/
/* completion functions */

/*
 * does tilde expansion of strings of type ``~user/foo''
 * if ``user'' isn't valid user name or ``txt'' doesn't start
 * w/ '~', returns pointer to strdup()ed copy of ``txt''
 *
 * it's the caller's responsibility to free() the returned string
 */
char *
fn_tilde_expand(const char *txt)
{
#if defined(HAVE_GETPW_R_POSIX) || defined(HAVE_GETPW_R_DRAFT)
	struct passwd pwres;
	char pwbuf[1024];
#endif
	struct passwd *pass;
	char *temp;
	size_t len = 0;

	if (txt[0] != '~')
		return strdup(txt);

	temp = strchr(txt + 1, '/');
	if (temp == NULL) {
		temp = strdup(txt + 1);
		if (temp == NULL)
			return NULL;
	} else {
		/* text until string after slash */
		len = (size_t)(temp - txt + 1);
		temp = el_malloc(len * sizeof(*temp));
		if (temp == NULL)
			return NULL;
		(void)strncpy(temp, txt + 1, len - 2);
		temp[len - 2] = '\0';
	}
	if (temp[0] == 0) {
#ifdef HAVE_GETPW_R_POSIX
		if (getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf),
		    &pass) != 0)
			pass = NULL;
#elif HAVE_GETPW_R_DRAFT
		pass = getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf));
#else
		pass = getpwuid(getuid());
#endif
	} else {
#ifdef HAVE_GETPW_R_POSIX
		if (getpwnam_r(temp, &pwres, pwbuf, sizeof(pwbuf), &pass) != 0)
			pass = NULL;
#elif HAVE_GETPW_R_DRAFT
		pass = getpwnam_r(temp, &pwres, pwbuf, sizeof(pwbuf));
#else
		pass = getpwnam(temp);
#endif
	}
	el_free(temp);		/* value no more needed */
	if (pass == NULL)
		return strdup(txt);

	/* update pointer txt to point at string immedially following */
	/* first slash */
	txt += len;

	len = strlen(pass->pw_dir) + 1 + strlen(txt) + 1;
	temp = el_malloc(len * sizeof(*temp));
	if (temp == NULL)
		return NULL;
	(void)snprintf(temp, len, "%s/%s", pass->pw_dir, txt);

	return temp;
}


/*
 * return first found file name starting by the ``text'' or NULL if no
 * such file can be found
 * value of ``state'' is ignored
 *
 * it's the caller's responsibility to free the returned string
 */
char *
fn_filename_completion_function(const char *text, int state)
{
	static DIR *dir = NULL;
	static char *filename = NULL, *dirname = NULL, *dirpath = NULL;
	static size_t filename_len = 0;
	struct dirent *entry;
	char *temp;
	size_t len;

	if (state == 0 || dir == NULL) {
		temp = strrchr(text, '/');
		if (temp) {
			char *nptr;
			temp++;
			nptr = el_realloc(filename, (strlen(temp) + 1) *
			    sizeof(*nptr));
			if (nptr == NULL) {
				el_free(filename);
				filename = NULL;
				return NULL;
			}
			filename = nptr;
			(void)strcpy(filename, temp);
			len = (size_t)(temp - text);	/* including last slash */

			nptr = el_realloc(dirname, (len + 1) *
			    sizeof(*nptr));
			if (nptr == NULL) {
				el_free(dirname);
				dirname = NULL;
				return NULL;
			}
			dirname = nptr;
			(void)strncpy(dirname, text, len);
			dirname[len] = '\0';
		} else {
			el_free(filename);
			if (*text == 0)
				filename = NULL;
			else {
				filename = strdup(text);
				if (filename == NULL)
					return NULL;
			}
			el_free(dirname);
			dirname = NULL;
		}

		if (dir != NULL) {
			(void)closedir(dir);
			dir = NULL;
		}

		/* support for ``~user'' syntax */

		el_free(dirpath);
		dirpath = NULL;
		if (dirname == NULL) {
			if ((dirname = strdup("")) == NULL)
				return NULL;
			dirpath = strdup("./");
		} else if (*dirname == '~')
			dirpath = fn_tilde_expand(dirname);
		else
			dirpath = strdup(dirname);

		if (dirpath == NULL)
			return NULL;

		dir = opendir(dirpath);
		if (!dir)
			return NULL;	/* cannot open the directory */

		/* will be used in cycle */
		filename_len = filename ? strlen(filename) : 0;
	}

	/* find the match */
	while ((entry = readdir(dir)) != NULL) {
		/* skip . and .. */
		if (entry->d_name[0] == '.' && (!entry->d_name[1]
		    || (entry->d_name[1] == '.' && !entry->d_name[2])))
			continue;
		if (filename_len == 0)
			break;
		/* otherwise, get first entry where first */
		/* filename_len characters are equal	  */
		if (entry->d_name[0] == filename[0]
#if HAVE_STRUCT_DIRENT_D_NAMLEN
		    && entry->d_namlen >= filename_len
#else
		    && strlen(entry->d_name) >= filename_len
#endif
		    && strncmp(entry->d_name, filename,
			filename_len) == 0)
			break;
	}

	if (entry) {		/* match found */

#if HAVE_STRUCT_DIRENT_D_NAMLEN
		len = entry->d_namlen;
#else
		len = strlen(entry->d_name);
#endif

		len = strlen(dirname) + len + 1;
		temp = el_malloc(len * sizeof(*temp));
		if (temp == NULL)
			return NULL;
		(void)snprintf(temp, len, "%s%s", dirname, entry->d_name);
	} else {
		(void)closedir(dir);
		dir = NULL;
		temp = NULL;
	}

	return temp;
}


static const char *
append_char_function(const char *name)
{
	struct stat stbuf;
	char *expname = *name == '~' ? fn_tilde_expand(name) : NULL;
	const char *rs = " ";

	if (stat(expname ? expname : name, &stbuf) == -1)
		goto out;
	if (S_ISDIR(stbuf.st_mode))
		rs = "/";
out:
	if (expname)
		el_free(expname);
	return rs;
}
/*
 * returns list of completions for text given
 * non-static for readline.
 */
char ** completion_matches(const char *, char *(*)(const char *, int));
char **
completion_matches(const char *text, char *(*genfunc)(const char *, int))
{
	char **match_list = NULL, *retstr, *prevstr;
	size_t match_list_len, max_equal, which, i;
	size_t matches;

	matches = 0;
	match_list_len = 1;
	while ((retstr = (*genfunc) (text, (int)matches)) != NULL) {
		/* allow for list terminator here */
		if (matches + 3 >= match_list_len) {
			char **nmatch_list;
			while (matches + 3 >= match_list_len)
				match_list_len <<= 1;
			nmatch_list = el_realloc(match_list,
			    match_list_len * sizeof(*nmatch_list));
			if (nmatch_list == NULL) {
				el_free(match_list);
				return NULL;
			}
			match_list = nmatch_list;

		}
		match_list[++matches] = retstr;
	}

	if (!match_list)
		return NULL;	/* nothing found */

	/* find least denominator and insert it to match_list[0] */
	which = 2;
	prevstr = match_list[1];
	max_equal = strlen(prevstr);
	for (; which <= matches; which++) {
		for (i = 0; i < max_equal &&
		    prevstr[i] == match_list[which][i]; i++)
			continue;
		max_equal = i;
	}

	retstr = el_malloc((max_equal + 1) * sizeof(*retstr));
	if (retstr == NULL) {
		el_free(match_list);
		return NULL;
	}
	(void)strncpy(retstr, match_list[1], max_equal);
	retstr[max_equal] = '\0';
	match_list[0] = retstr;

	/* add NULL as last pointer to the array */
	match_list[matches + 1] = NULL;

	return match_list;
}

/*
 * Sort function for qsort(). Just wrapper around strcasecmp().
 */
static int
_fn_qsort_string_compare(const void *i1, const void *i2)
{
	const char *s1 = ((const char * const *)i1)[0];
	const char *s2 = ((const char * const *)i2)[0];

	return strcasecmp(s1, s2);
}

/*
 * Display list of strings in columnar format on readline's output stream.
 * 'matches' is list of strings, 'num' is number of strings in 'matches',
 * 'width' is maximum length of string in 'matches'.
 *
 * matches[0] is not one of the match strings, but it is counted in
 * num, so the strings are matches[1] *through* matches[num-1].
 */
void
fn_display_match_list (EditLine *el, char **matches, size_t num, size_t width)
{
	size_t line, lines, col, cols, thisguy;
	int screenwidth = el->el_terminal.t_size.h;

	/* Ignore matches[0]. Avoid 1-based array logic below. */
	matches++;
	num--;

	/*
	 * Find out how many entries can be put on one line; count
	 * with one space between strings the same way it's printed.
	 */
	cols = (size_t)screenwidth / (width + 1);
	if (cols == 0)
		cols = 1;

	/* how many lines of output, rounded up */
	lines = (num + cols - 1) / cols;

	/* Sort the items. */
	qsort(matches, num, sizeof(char *), _fn_qsort_string_compare);

	/*
	 * On the ith line print elements i, i+lines, i+lines*2, etc.
	 */
	for (line = 0; line < lines; line++) {
		for (col = 0; col < cols; col++) {
			thisguy = line + col * lines;
			if (thisguy >= num)
				break;
			(void)fprintf(el->el_outfile, "%s%-*s",
			    col == 0 ? "" : " ", (int)width, matches[thisguy]);
		}
		(void)fprintf(el->el_outfile, "\n");
	}
}

/*
 * Complete the word at or before point,
 * 'what_to_do' says what to do with the completion.
 * \t   means do standard completion.
 * `?' means list the possible completions.
 * `*' means insert all of the possible completions.
 * `!' means to do standard completion, and list all possible completions if
 * there is more than one.
 *
 * Note: '*' support is not implemented
 *       '!' could never be invoked
 */
int
fn_complete(EditLine *el,
	char *(*complet_func)(const char *, int),
	char **(*attempted_completion_function)(const char *, int, int),
	const Char *word_break, const Char *special_prefixes,
	const char *(*app_func)(const char *), size_t query_items,
	int *completion_type, int *over, int *point, int *end,
	const Char *(*find_word_start_func)(const Char *, const Char *),
	Char *(*dequoting_func)(const Char *),
	char *(*quoting_func)(const char *))
{
	const TYPE(LineInfo) *li;
	Char *temp;
	Char *dequoted_temp;
        char **matches;
	const Char *ctemp;
	size_t len;
	int what_to_do = '\t';
	int retval = CC_NORM;

	if (el->el_state.lastcmd == el->el_state.thiscmd)
		what_to_do = '?';

	/* readline's rl_complete() has to be told what we did... */
	if (completion_type != NULL)
		*completion_type = what_to_do;

	if (!complet_func)
		complet_func = fn_filename_completion_function;
	if (!app_func)
		app_func = append_char_function;

	/* We now look backwards for the start of a filename/variable word */
	li = FUN(el,line)(el);
	if (find_word_start_func)
		ctemp = find_word_start_func(li->buffer, li->cursor);
	else {
		ctemp = li->cursor;
		while (ctemp > li->buffer
		    && !Strchr(word_break, ctemp[-1])
		    && (!special_prefixes || !Strchr(special_prefixes, ctemp[-1]) ) )
			ctemp--;
	}

	len = (size_t)(li->cursor - ctemp);
	temp = el_malloc((len + 1) * sizeof(*temp));
	(void)Strncpy(temp, ctemp, len);
	temp[len] = '\0';

	if (dequoting_func) {
		dequoted_temp = dequoting_func(temp);
		if (dequoted_temp == NULL)
			return retval;
	} else
		dequoted_temp = NULL;

	/* these can be used by function called in completion_matches() */
	/* or (*attempted_completion_function)() */
	if (point != NULL)
		*point = (int)(li->cursor - li->buffer);
	if (end != NULL)
		*end = (int)(li->lastchar - li->buffer);

	if (attempted_completion_function) {
		int cur_off = (int)(li->cursor - li->buffer);
		matches = (*attempted_completion_function)(
		    ct_encode_string(dequoted_temp ? dequoted_temp : temp,
		        &el->el_scratch),
		    cur_off - (int)len, cur_off);
	} else
		matches = NULL;
	if (!attempted_completion_function ||
	    (over != NULL && !*over && !matches))
		matches = completion_matches(
		    ct_encode_string(dequoted_temp ? dequoted_temp : temp,
		        &el->el_scratch), complet_func);

	if (over != NULL)
		*over = 0;

	if (matches) {
		int i;
		size_t matches_num, maxlen, match_len, match_display=1;

		retval = CC_REFRESH;
		/*
		 * Only replace the completed string with common part of
		 * possible matches if there is possible completion.
		 */
		if (matches[0][0] != '\0') {
			char *quoted_match;
			if (quoting_func) {
				quoted_match = quoting_func(matches[0]);
				if (quoted_match == NULL)
					goto free_matches;
			} else
				quoted_match = NULL;
			el_deletestr(el, (int) len);
			FUN(el,insertstr)(el,
			    ct_decode_string(quoted_match ? quoted_match :
			        matches[0] , &el->el_scratch));
		}

		if (what_to_do == '?')
			goto display_matches;

		if (matches[2] == NULL &&
		    (matches[1] == NULL || strcmp(matches[0], matches[1]) == 0)) {
			/*
			 * We found exact match. Add a space after
			 * it, unless we do filename completion and the
			 * object is a directory.
			 */
			FUN(el,insertstr)(el,
			    ct_decode_string((*app_func)(matches[0]),
			    &el->el_scratch));
		} else if (what_to_do == '!') {
    display_matches:
			/*
			 * More than one match and requested to list possible
			 * matches.
			 */

			for(i = 1, maxlen = 0; matches[i]; i++) {
				match_len = strlen(matches[i]);
				if (match_len > maxlen)
					maxlen = match_len;
			}
			/* matches[1] through matches[i-1] are available */
			matches_num = (size_t)(i - 1);

			/* newline to get on next line from command line */
			(void)fprintf(el->el_outfile, "\n");

			/*
			 * If there are too many items, ask user for display
			 * confirmation.
			 */
			if (matches_num > query_items) {
				(void)fprintf(el->el_outfile,
				    "Display all %zu possibilities? (y or n) ",
				    matches_num);
				(void)fflush(el->el_outfile);
				if (getc(stdin) != 'y')
					match_display = 0;
				(void)fprintf(el->el_outfile, "\n");
			}

			if (match_display) {
				/*
				 * Interface of this function requires the
				 * strings be matches[1..num-1] for compat.
				 * We have matches_num strings not counting
				 * the prefix in matches[0], so we need to
				 * add 1 to matches_num for the call.
				 */
				fn_display_match_list(el, matches,
				    matches_num+1, maxlen);
			}
			retval = CC_REDISPLAY;
		} else if (matches[0][0]) {
			/*
			 * There was some common match, but the name was
			 * not complete enough. Next tab will print possible
			 * completions.
			 */
			el_beep(el);
		} else {
			/* lcd is not a valid object - further specification */
			/* is needed */
			el_beep(el);
			retval = CC_NORM;
		}

free_matches:
		/* free elements of array and the array itself */
		for (i = 0; matches[i]; i++)
			el_free(matches[i]);
		el_free(matches);
		matches = NULL;
	}
	free(dequoted_temp);
	el_free(temp);
	return retval;
}

/*
 * el-compatible wrapper around rl_complete; needed for key binding
 */
/* ARGSUSED */
unsigned char
_el_fn_complete(EditLine *el, int ch __attribute__((__unused__)))
{
	return (unsigned char)fn_complete(el, NULL, NULL,
	    break_chars, NULL, NULL, (size_t)100,
	    NULL, NULL, NULL, NULL,
	    NULL, NULL, NULL);
}

static const Char *
sh_find_word_start(const Char *buffer, const Char *cursor)
{
	const Char *word_start = buffer;

	while (buffer < cursor) {
		if (*buffer == '\\')
			buffer++;
		else if (Strchr(break_chars, *buffer))
			word_start = buffer + 1;
		buffer++;
	}
	return word_start;
}

static char *
sh_quote(const char *str)
{
	const char *src;
	int extra_len = 0;
	char *quoted_str, *dst;

	 for (src = str; *src != '\0'; src++)
		if (Strchr(break_chars, *src) ||
		    Strchr(extra_quote_chars, *src))
			extra_len++;

	quoted_str = malloc(sizeof(*quoted_str) *
	     (strlen(str) + extra_len + 1));
	if (quoted_str == NULL)
		return NULL;

	dst = quoted_str;
	for (src = str; *src != '\0'; src++) {
		if (Strchr(break_chars, *src) ||
		    Strchr(extra_quote_chars, *src))
			*dst++ = '\\';
		*dst++ = *src;
	}
	*dst = '\0';

	return quoted_str;
}

static Char *
sh_dequote(const Char *str)
{
	Char *dequoted_str, *dst;

	/* save extra space to replace \~ with ./~ */
	dequoted_str = malloc(sizeof(*dequoted_str) * (Strlen(str) + 1 + 1));
	if (dequoted_str == NULL)
		return NULL;

	dst = dequoted_str;

	/* dequote \~ at start as ./~ */
	if (*str == '\\' && str[1] == '~') {
		str++;
		*dst++ = '.';
		*dst++ = '/';
	}

	while (*str) {
		if (*str == '\\')
			str++;
		if (*str)
			*dst++ = *str++;
	}
	*dst = '\0';

	return dequoted_str;
}

/*
 * completion function using sh quoting rules; for key binding
 */
/* ARGSUSED */
unsigned char
_el_fn_sh_complete(EditLine *el, int ch __attribute__((__unused__)))
{
	return (unsigned char)fn_complete(el, NULL, NULL,
	    break_chars, NULL, NULL, 100,
	    NULL, NULL, NULL, NULL,
	    sh_find_word_start, sh_dequote, sh_quote);
}