File: file.c

package info (click to toggle)
csh 20110502-2
  • links: PTS
  • area: main
  • in suites: wheezy
  • size: 1,104 kB
  • sloc: ansic: 11,984; makefile: 62; sh: 16
file content (653 lines) | stat: -rw-r--r-- 16,215 bytes parent folder | download | duplicates (5)
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
/*	$OpenBSD: file.c,v 1.16 2009/10/27 23:59:21 deraadt Exp $	*/
/*	$NetBSD: file.c,v 1.11 1996/11/08 19:34:37 christos Exp $	*/

/*-
 * Copyright (c) 1980, 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 */

#ifdef FILEC

#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <termios.h>
#include <dirent.h>
#include <pwd.h>
#include <stdlib.h>
#include <unistd.h>
#ifndef SHORT_STRINGS
#include <string.h>
#endif /* SHORT_STRINGS */
#include <stdarg.h>

#include "csh.h"
#include "extern.h"

/*
 * Tenex style file name recognition, .. and more.
 * History:
 *	Author: Ken Greer, Sept. 1975, CMU.
 *	Finally got around to adding to the Cshell., Ken Greer, Dec. 1981.
 */

#define ON	1
#define OFF	0
#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif

#define ESC	'\033'

typedef enum {
    LIST, RECOGNIZE
}       COMMAND;

static void	 setup_tty(int);
static void	 back_to_col_1(void);
static void	 pushback(Char *);
static void	 catn(Char *, Char *, int);
static void	 copyn(Char *, Char *, int);
static Char	 filetype(Char *, Char *);
static void	 print_by_column(Char *, Char *[], int);
static Char	*tilde(Char *, Char *);
static void	 retype(void);
static void	 beep(void);
static void	 print_recognized_stuff(Char *);
static void	 extract_dir_and_name(Char *, Char *, Char *);
static Char	*getentry(DIR *, int);
static void	 free_items(Char **, int);
static int	 tsearch(Char *, COMMAND, int);
static int	 recognize(Char *, Char *, int, int);
static int	 is_prefix(Char *, Char *);
static int	 is_suffix(Char *, Char *);
static int	 ignored(Char *);

/*
 * Put this here so the binary can be patched with adb to enable file
 * completion by default.  Filec controls completion, nobeep controls
 * ringing the terminal bell on incomplete expansions.
 */
bool    filec = 0;

static void
setup_tty(int on)
{
    struct termios tchars;

    (void) tcgetattr(SHIN, &tchars);

    if (on) {
	tchars.c_cc[VEOL] = ESC;
	if (tchars.c_lflag & ICANON)
	    on = TCSADRAIN;
	else {
	    tchars.c_lflag |= ICANON;
	    on = TCSAFLUSH;
	}
    }
    else {
	tchars.c_cc[VEOL] = _POSIX_VDISABLE;
	on = TCSADRAIN;
    }

    (void) tcsetattr(SHIN, on, &tchars);
}

/*
 * Move back to beginning of current line
 */
static void
back_to_col_1(void)
{
    struct termios tty, tty_normal;
    sigset_t sigset, osigset;

    sigemptyset(&sigset);
    sigaddset(&sigset, SIGINT);
    sigprocmask(SIG_BLOCK, &sigset, &osigset);
    (void) tcgetattr(SHOUT, &tty);
    tty_normal = tty;
    tty.c_iflag &= ~INLCR;
    tty.c_oflag &= ~ONLCR;
    (void) tcsetattr(SHOUT, TCSADRAIN, &tty);
    (void) write(SHOUT, "\r", 1);
    (void) tcsetattr(SHOUT, TCSADRAIN, &tty_normal);
    sigprocmask(SIG_SETMASK, &osigset, NULL);
}

/*
 * Push string contents back into tty queue
 */
static void
pushback(Char *string)
{
    Char *p;
    struct termios tty, tty_normal;
    sigset_t sigset, osigset;
    char    c;

    sigemptyset(&sigset);
    sigaddset(&sigset, SIGINT);
    sigprocmask(SIG_BLOCK, &sigset, &osigset);
    (void) tcgetattr(SHOUT, &tty);
    tty_normal = tty;
    tty.c_lflag &= ~(ECHOKE | ECHO | ECHOE | ECHOK | ECHONL | ECHOPRT | ECHOCTL);
    (void) tcsetattr(SHOUT, TCSADRAIN, &tty);

    for (p = string; (c = *p) != '\0'; p++)
	(void) ioctl(SHOUT, TIOCSTI, (ioctl_t) & c);
    (void) tcsetattr(SHOUT, TCSADRAIN, &tty_normal);
    sigprocmask(SIG_SETMASK, &osigset, NULL);
}

/*
 * Concatenate src onto tail of des.
 * Des is a string whose maximum length is count.
 * Always null terminate.
 */
static void
catn(Char *des, Char *src, int count)
{
    while (--count >= 0 && *des)
	des++;
    while (--count >= 0)
	if ((*des++ = *src++) == 0)
	    return;
    *des = '\0';
}

/*
 * Like strncpy but always leave room for trailing \0
 * and always null terminate.
 */
static void
copyn(Char *des, Char *src, int count)
{
    while (--count >= 0)
	if ((*des++ = *src++) == 0)
	    return;
    *des = '\0';
}

static  Char
filetype(Char *dir, Char *file)
{
    Char    path[MAXPATHLEN];
    struct stat statb;

    Strlcpy(path, dir, sizeof path/sizeof(Char));
    catn(path, file, sizeof(path) / sizeof(Char));
    if (lstat(short2str(path), &statb) == 0) {
	switch (statb.st_mode & S_IFMT) {
	case S_IFDIR:
	    return ('/');

	case S_IFLNK:
	    if (stat(short2str(path), &statb) == 0 &&	/* follow it out */
		S_ISDIR(statb.st_mode))
		return ('>');
	    else
		return ('@');

	case S_IFSOCK:
	    return ('=');

	default:
	    if (statb.st_mode & 0111)
		return ('*');
	}
    }
    return (' ');
}

static struct winsize win;

/*
 * Print sorted down columns
 */
static void
print_by_column(Char *dir, Char *items[], int count)
{
    int i, rows, r, c, maxwidth = 0, columns;

    if (ioctl(SHOUT, TIOCGWINSZ, (ioctl_t) & win) < 0 || win.ws_col == 0)
	win.ws_col = 80;
    for (i = 0; i < count; i++)
	maxwidth = maxwidth > (r = Strlen(items[i])) ? maxwidth : r;
    maxwidth += 2;		/* for the file tag and space */
    columns = win.ws_col / maxwidth;
    if (columns == 0)
	columns = 1;
    rows = (count + (columns - 1)) / columns;
    for (r = 0; r < rows; r++) {
	for (c = 0; c < columns; c++) {
	    i = c * rows + r;
	    if (i < count) {
		int w;

		(void) fprintf(cshout, "%s", vis_str(items[i]));
		(void) fputc(dir ? filetype(dir, items[i]) : ' ', cshout);
		if (c < columns - 1) {	/* last column? */
		    w = Strlen(items[i]) + 1;
		    for (; w < maxwidth; w++)
			(void) fputc(' ', cshout);
		}
	    }
	}
	(void) fputc('\r', cshout);
	(void) fputc('\n', cshout);
    }
}

/*
 * Expand file name with possible tilde usage
 *	~person/mumble
 * expands to
 *	home_directory_of_person/mumble
 */
static Char *
tilde(Char *new, Char *old)
{
    Char *o, *p;
    struct passwd *pw;
    static Char person[40];

    if (old[0] != '~') {
	Strlcpy(new, old, MAXPATHLEN);
	return new;
    }

    for (p = person, o = &old[1]; *o && *o != '/'; *p++ = *o++)
	continue;
    *p = '\0';
    if (person[0] == '\0')
	(void) Strlcpy(new, value(STRhome), MAXPATHLEN);
    else {
	pw = getpwnam(short2str(person));
	if (pw == NULL)
	    return (NULL);
	(void) Strlcpy(new, str2short(pw->pw_dir), MAXPATHLEN);
    }
    (void) Strlcat(new, o, MAXPATHLEN);
    return (new);
}

/*
 * Cause pending line to be printed
 */
static void
retype(void)
{
    struct termios tty;

    (void) tcgetattr(SHOUT, &tty);
    tty.c_lflag |= PENDIN;
    (void) tcsetattr(SHOUT, TCSADRAIN, &tty);
}

static void
beep(void)
{
    if (adrof(STRnobeep) == 0)
	(void) write(SHOUT, "\007", 1);
}

/*
 * Erase that silly ^[ and
 * print the recognized part of the string
 */
static void
print_recognized_stuff(Char *recognized_part)
{
    /* An optimized erasing of that silly ^[ */
    (void) fputc('\b', cshout);
    (void) fputc('\b', cshout);
    switch (Strlen(recognized_part)) {

    case 0:			/* erase two Characters: ^[ */
	(void) fputc(' ', cshout);
	(void) fputc(' ', cshout);
	(void) fputc('\b', cshout);
	(void) fputc('\b', cshout);
	break;

    case 1:			/* overstrike the ^, erase the [ */
	(void) fprintf(cshout, "%s", vis_str(recognized_part));
	(void) fputc(' ', cshout);
	(void) fputc('\b', cshout);
	break;

    default:			/* overstrike both Characters ^[ */
	(void) fprintf(cshout, "%s", vis_str(recognized_part));
	break;
    }
    (void) fflush(cshout);
}

/*
 * Parse full path in file into 2 parts: directory and file names
 * Should leave final slash (/) at end of dir.
 */
static void
extract_dir_and_name(Char *path, Char *dir, Char *name)
{
    Char *p;

    p = Strrchr(path, '/');
    if (p == NULL) {
	copyn(name, path, MAXNAMLEN);
	dir[0] = '\0';
    }
    else {
	copyn(name, ++p, MAXNAMLEN);
	copyn(dir, path, p - path);
    }
}

static Char *
getentry(DIR *dir_fd, int looking_for_lognames)
{
    struct passwd *pw;
    struct dirent *dirp;

    if (looking_for_lognames) {
	if ((pw = getpwent()) == NULL)
	    return (NULL);
	return (str2short(pw->pw_name));
    }
    if ((dirp = readdir(dir_fd)) != NULL)
	return (str2short(dirp->d_name));
    return (NULL);
}

static void
free_items(Char **items, int numitems)
{
    int i;

    for (i = 0; i < numitems; i++)
	xfree((ptr_t) items[i]);
    xfree((ptr_t) items);
}

#define FREE_ITEMS(items) { \
	sigset_t sigset, osigset;\
\
	sigemptyset(&sigset);\
	sigaddset(&sigset, SIGINT);\
	sigprocmask(SIG_BLOCK, &sigset, &osigset);\
	free_items(items, numitems);\
	sigprocmask(SIG_SETMASK, &osigset, NULL);\
}

/*
 * Perform a RECOGNIZE or LIST command on string "word".
 */
static int
tsearch(Char *word, COMMAND command, int max_word_length)
{
    DIR *dir_fd;
    int numitems = 0, ignoring = TRUE, nignored = 0;
    int name_length, looking_for_lognames;
    Char    tilded_dir[MAXPATHLEN], dir[MAXPATHLEN];
    Char    name[MAXNAMLEN + 1], extended_name[MAXNAMLEN + 1];
    Char   *entry;
    Char   **items = NULL;
    size_t  maxitems = 0;

    looking_for_lognames = (*word == '~') && (Strchr(word, '/') == NULL);
    if (looking_for_lognames) {
	(void) setpwent();
	copyn(name, &word[1], MAXNAMLEN);	/* name sans ~ */
	dir_fd = NULL;
    }
    else {
	extract_dir_and_name(word, dir, name);
	if (tilde(tilded_dir, dir) == 0)
	    return (0);
	dir_fd = opendir(*tilded_dir ? short2str(tilded_dir) : ".");
	if (dir_fd == NULL)
	    return (0);
    }

again:				/* search for matches */
    name_length = Strlen(name);
    for (numitems = 0; (entry = getentry(dir_fd, looking_for_lognames)) != NULL;) {
	if (!is_prefix(name, entry))
	    continue;
	/* Don't match . files on null prefix match */
	if (name_length == 0 && entry[0] == '.' &&
	    !looking_for_lognames)
	    continue;
	if (command == LIST) {
	    if (numitems >= maxitems) {
		maxitems += 1024;
		if (items == NULL)
			items = (Char **) xmalloc(sizeof(*items) * maxitems);
		else
			items = (Char **) xrealloc((ptr_t) items,
			    sizeof(*items) * maxitems);
	    }
	    items[numitems] = (Char *) xmalloc((size_t) (Strlen(entry) + 1) *
					       sizeof(Char));
	    copyn(items[numitems], entry, MAXNAMLEN);
	    numitems++;
	}
	else {			/* RECOGNIZE command */
	    if (ignoring && ignored(entry))
		nignored++;
	    else if (recognize(extended_name,
			       entry, name_length, ++numitems))
		break;
	}
    }
    if (ignoring && numitems == 0 && nignored > 0) {
	ignoring = FALSE;
	nignored = 0;
	if (looking_for_lognames)
	    (void) setpwent();
	else
	    rewinddir(dir_fd);
	goto again;
    }

    if (looking_for_lognames)
	(void) endpwent();
    else
	(void) closedir(dir_fd);
    if (numitems == 0)
	return (0);
    if (command == RECOGNIZE) {
	if (looking_for_lognames)
	    copyn(word, STRtilde, 1);
	else
	    /* put back dir part */
	    copyn(word, dir, max_word_length);
	/* add extended name */
	catn(word, extended_name, max_word_length);
	return (numitems);
    }
    else {			/* LIST */
	qsort((ptr_t) items, numitems, sizeof(*items),
		(int (*)(const void *, const void *)) sortscmp);
	print_by_column(looking_for_lognames ? NULL : tilded_dir,
			items, numitems);
	if (items != NULL)
	    FREE_ITEMS(items);
    }
    return (0);
}

/*
 * Object: extend what user typed up to an ambiguity.
 * Algorithm:
 * On first match, copy full entry (assume it'll be the only match)
 * On subsequent matches, shorten extended_name to the first
 * Character mismatch between extended_name and entry.
 * If we shorten it back to the prefix length, stop searching.
 */
static int
recognize(Char *extended_name, Char *entry, int name_length, int numitems)
{
    if (numitems == 1)		/* 1st match */
	copyn(extended_name, entry, MAXNAMLEN);
    else {			/* 2nd & subsequent matches */
	Char *x, *ent;
	int len = 0;

	x = extended_name;
	for (ent = entry; *x && *x == *ent++; x++, len++)
	    continue;
	*x = '\0';		/* Shorten at 1st Char diff */
	if (len == name_length)	/* Ambiguous to prefix? */
	    return (-1);	/* So stop now and save time */
    }
    return (0);
}

/*
 * Return true if check matches initial Chars in template.
 * This differs from PWB imatch in that if check is null
 * it matches anything.
 */
static int
is_prefix(Char *check, Char *template)
{
    do
	if (*check == 0)
	    return (TRUE);
    while (*check++ == *template++);
    return (FALSE);
}

/*
 *  Return true if the Chars in template appear at the
 *  end of check, I.e., are it's suffix.
 */
static int
is_suffix(Char *check, Char *template)
{
    Char *c, *t;

    for (c = check; *c++;)
	continue;
    for (t = template; *t++;)
	continue;
    for (;;) {
	if (t == template)
	    return 1;
	if (c == check || *--t != *--c)
	    return 0;
    }
}

int
tenex(Char *inputline, int inputline_size)
{
    int numitems, num_read;
    char    tinputline[BUFSIZ];

    setup_tty(ON);

    while ((num_read = read(SHIN, tinputline, BUFSIZ)) > 0) {
	int     i;
	static Char delims[] = {' ', '\'', '"', '\t', ';', '&', '<',
	'>', '(', ')', '|', '^', '%', '\0'};
	Char *str_end, *word_start, last_Char, should_retype;
	int space_left;
	COMMAND command;

	for (i = 0; i < num_read; i++)
	    inputline[i] = (unsigned char) tinputline[i];
	last_Char = inputline[num_read - 1] & ASCII;

	if (last_Char == '\n' || num_read == inputline_size)
	    break;
	command = (last_Char == ESC) ? RECOGNIZE : LIST;
	if (command == LIST)
	    (void) fputc('\n', cshout);
	str_end = &inputline[num_read];
	if (last_Char == ESC)
	    --str_end;		/* wipeout trailing cmd Char */
	*str_end = '\0';
	/*
	 * Find LAST occurrence of a delimiter in the inputline. The word start
	 * is one Character past it.
	 */
	for (word_start = str_end; word_start > inputline; --word_start)
	    if (Strchr(delims, word_start[-1]))
		break;
	space_left = inputline_size - (word_start - inputline) - 1;
	numitems = tsearch(word_start, command, space_left);

	if (command == RECOGNIZE) {
	    /* print from str_end on */
	    print_recognized_stuff(str_end);
	    if (numitems != 1)	/* Beep = No match/ambiguous */
		beep();
	}

	/*
	 * Tabs in the input line cause trouble after a pushback. tty driver
	 * won't backspace over them because column positions are now
	 * incorrect. This is solved by retyping over current line.
	 */
	should_retype = FALSE;
	if (Strchr(inputline, '\t')) {	/* tab Char in input line? */
	    back_to_col_1();
	    should_retype = TRUE;
	}
	if (command == LIST)	/* Always retype after a LIST */
	    should_retype = TRUE;
	if (should_retype)
	    printprompt();
	pushback(inputline);
	if (should_retype)
	    retype();
    }
    setup_tty(OFF);
    return (num_read);
}

static int
ignored(Char *entry)
{
    struct varent *vp;
    Char **cp;

    if ((vp = adrof(STRfignore)) == NULL || (cp = vp->vec) == NULL)
	return (FALSE);
    for (; *cp != NULL; cp++)
	if (is_suffix(entry, *cp))
	    return (TRUE);
    return (FALSE);
}
#endif				/* FILEC */