summaryrefslogtreecommitdiff
path: root/findutils/find.c
blob: abd7576624dbaaedf1c9a676781df67bc409fbb2 (plain)
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
/* vi: set sw=4 ts=4: */
/*
 * Mini find implementation for busybox
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * Reworked by David Douthitt <n9ubh@callsign.net> and
 *  Matt Kraai <kraai@alumni.carnegiemellon.edu>.
 *
 * Licensed under the GPL version 2, see the file LICENSE in this tarball.
 */

/* findutils-4.1.20:
 *
 * # find file.txt -exec 'echo {}' '{}  {}' ';'
 * find: echo file.txt: No such file or directory
 * # find file.txt -exec 'echo' '{}  {}' '; '
 * find: missing argument to `-exec'
 * # find file.txt -exec 'echo {}' '{}  {}' ';' junk
 * find: paths must precede expression
 * # find file.txt -exec 'echo {}' '{}  {}' ';' junk ';'
 * find: paths must precede expression
 * # find file.txt -exec 'echo' '{}  {}' ';'
 * file.txt  file.txt
 * (strace: execve("/bin/echo", ["echo", "file.txt  file.txt"], [ 30 vars ]))
 * # find file.txt -exec 'echo' '{}  {}' ';' -print -exec pwd ';'
 * file.txt  file.txt
 * file.txt
 * /tmp
 * # find -name '*.c' -o -name '*.h'
 * [shows files, *.c and *.h intermixed]
 * # find file.txt -name '*f*' -o -name '*t*'
 * file.txt
 * # find file.txt -name '*z*' -o -name '*t*'
 * file.txt
 * # find file.txt -name '*f*' -o -name '*z*'
 * file.txt
 */

#include "busybox.h"
#include <fnmatch.h>

USE_FEATURE_FIND_XDEV(static dev_t *xdev_dev;)
USE_FEATURE_FIND_XDEV(static int xdev_count;)

typedef int (*action_fp)(const char *fileName, struct stat *statbuf, void *);

typedef struct {
	action_fp f;
} action;
#define SACT(name, arg...) typedef struct { action a; arg; } action_##name;
#define SFUNC(name)        static int func_##name(const char *fileName, struct stat *statbuf, action_##name* ap)
                        SACT(print)
                        SACT(name,  char *pattern;)
USE_FEATURE_FIND_PRINT0(SACT(print0))
USE_FEATURE_FIND_TYPE(  SACT(type,  int type_mask;))
USE_FEATURE_FIND_PERM(  SACT(perm,  char perm_char; int perm_mask;))
USE_FEATURE_FIND_MTIME( SACT(mtime, char mtime_char; int mtime_days;))
USE_FEATURE_FIND_MMIN(  SACT(mmin,  char mmin_char; int mmin_mins;))
USE_FEATURE_FIND_NEWER( SACT(newer, time_t newer_mtime;))
USE_FEATURE_FIND_INUM(  SACT(inum,  ino_t inode_num;))
USE_FEATURE_FIND_EXEC(  SACT(exec,  char **exec_argv; int *subst_count; int exec_argc;))

static action ***actions;


static int count_subst(const char *str)
{
	int count = 0;
	while ((str = strstr(str, "{}"))) {
		count++;
		str++;
	}
	return count;
}


static char* subst(const char *src, int count, const char* filename)
{
	char *buf, *dst, *end;
	int flen = strlen(filename);
	/* we replace each '{}' with filename: growth by strlen-2 */
	buf = dst = xmalloc(strlen(src) + count*(flen-2) + 1);
	while ((end = strstr(src, "{}"))) {
		memcpy(dst, src, end - src);
		dst += end - src;
		src = end + 2;
		memcpy(dst, filename, flen);
		dst += flen;
	}
	strcpy(dst, src);
	return buf;
}


SFUNC(name)
{
	const char *tmp = strrchr(fileName, '/');
	if (tmp == NULL)
		tmp = fileName;
	else
		tmp++;
	return fnmatch(ap->pattern, tmp, FNM_PERIOD) == 0;
}
#if ENABLE_FEATURE_FIND_TYPE
SFUNC(type)
{
	return !((statbuf->st_mode & S_IFMT) == ap->type_mask);
}
#endif
#if ENABLE_FEATURE_FIND_PERM
SFUNC(perm)
{
	return !((isdigit(ap->perm_char) && (statbuf->st_mode & 07777) == ap->perm_mask)
	        || (ap->perm_char == '-' && (statbuf->st_mode & ap->perm_mask) == ap->perm_mask)
	        || (ap->perm_char == '+' && (statbuf->st_mode & ap->perm_mask) != 0));
}
#endif
#if ENABLE_FEATURE_FIND_MTIME
SFUNC(mtime)
{
	time_t file_age = time(NULL) - statbuf->st_mtime;
	time_t mtime_secs = ap->mtime_days * 24 * 60 * 60;
	return !((isdigit(ap->mtime_char) && file_age >= mtime_secs
	                                  && file_age < mtime_secs + 24 * 60 * 60)
	        || (ap->mtime_char == '+' && file_age >= mtime_secs + 24 * 60 * 60)
	        || (ap->mtime_char == '-' && file_age < mtime_secs));
}
#endif
#if ENABLE_FEATURE_FIND_MMIN
SFUNC(mmin)
{
	time_t file_age = time(NULL) - statbuf->st_mtime;
	time_t mmin_secs = ap->mmin_mins * 60;
	return !((isdigit(ap->mmin_char) && file_age >= mmin_secs
	                                 && file_age < mmin_secs + 60)
	        || (ap->mmin_char == '+' && file_age >= mmin_secs + 60)
	        || (ap->mmin_char == '-' && file_age < mmin_secs));
}
#endif
#if ENABLE_FEATURE_FIND_NEWER
SFUNC(newer)
{
	return (ap->newer_mtime >= statbuf->st_mtime);
}
#endif
#if ENABLE_FEATURE_FIND_INUM
SFUNC(inum)
{
	return (statbuf->st_ino != ap->inode_num);
}
#endif
#if ENABLE_FEATURE_FIND_EXEC
SFUNC(exec)
{
	int i, rc;
	char *argv[ap->exec_argc+1];
	for (i = 0; i < ap->exec_argc; i++)
		argv[i] = subst(ap->exec_argv[i], ap->subst_count[i], fileName);
	argv[i] = NULL; /* terminate the list */
	errno = 0;
	rc = wait4pid(spawn(argv));
	if (errno)
		bb_perror_msg("%s", argv[0]);
	for (i = 0; i < ap->exec_argc; i++)
		free(argv[i]);
	return rc == 0; /* return 1 if success */
}
#endif

#if ENABLE_FEATURE_FIND_PRINT0
SFUNC(print0)
{
	printf("%s%c", fileName, '\0');
	return TRUE;
}
#endif
SFUNC(print)
{
	puts(fileName);
	return TRUE;
}


static int fileAction(const char *fileName, struct stat *statbuf, void* junk, int depth)
{
	int cur_group;
	int cur_action;
	action **app, *ap;

	cur_group = -1;
	while ((app = actions[++cur_group])) {
		cur_action = -1;
		do {
			ap = app[++cur_action];
		} while (ap && ap->f(fileName, statbuf, ap));
		if (!ap) {
			/* all actions in group were successful */
			break;
		}
	}
	return TRUE;
}


#if ENABLE_FEATURE_FIND_TYPE
static int find_type(char *type)
{
	int mask = 0;

	switch (type[0]) {
	case 'b':
		mask = S_IFBLK;
		break;
	case 'c':
		mask = S_IFCHR;
		break;
	case 'd':
		mask = S_IFDIR;
		break;
	case 'p':
		mask = S_IFIFO;
		break;
	case 'f':
		mask = S_IFREG;
		break;
	case 'l':
		mask = S_IFLNK;
		break;
	case 's':
		mask = S_IFSOCK;
		break;
	}

	if (mask == 0 || type[1] != '\0')
		bb_error_msg_and_die(bb_msg_invalid_arg, type, "-type");

	return mask;
}
#endif


int find_main(int argc, char **argv)
{
	int dereference = FALSE;
	int i, j, firstopt, status = EXIT_SUCCESS;
	int cur_group;
	int cur_action;
	int need_default = 1;

	action* alloc_action(int sizeof_struct, action_fp f)
	{
		action *ap;
		actions[cur_group] = xrealloc(actions[cur_group], (cur_action+2) * sizeof(*actions));
		actions[cur_group][cur_action++] = ap = xmalloc(sizeof_struct);
		actions[cur_group][cur_action] = NULL;
		ap->f = f;
		return ap;
	}
#define ALLOC_ACTION(name) (action_##name*)alloc_action(sizeof(action_##name), (action_fp) func_##name)

	for (firstopt = 1; firstopt < argc; firstopt++) {
		if (argv[firstopt][0] == '-')
			break;
	}
	if (firstopt == 1) {
		argv[0] = ".";
		argv--;
		argc++;
		firstopt++;
	}

// All options always return true. They always take effect,
// rather than being processed only when their place in the
// expression is reached
// We implement: -follow, -xdev

// Actions have side effects and return a true or false value
// We implement: -print, -print0, -exec

// The rest are tests.

// Tests and actions are grouped by operators
// ( expr )              Force precedence
// ! expr                True if expr is false
// -not expr             Same as ! expr
// expr1 [-a[nd]] expr2  And; expr2 is not evaluated if expr1 is false
// expr1 -o[r] expr2     Or; expr2 is not evaluated if expr1 is true
// expr1 , expr2         List; both expr1 and expr2 are always evaluated
// We implement: -a, -o

	cur_group = 0;
	cur_action = 0;
	actions = xzalloc(sizeof(*actions)); /* actions[0] == NULL */

	/* Parse any options */
	for (i = firstopt; i < argc; i++) {
		char *arg = argv[i];
		char *arg1 = argv[i+1];

	/* --- Operators --- */
		if (ENABLE_DESKTOP
		 && (strcmp(arg, "-a") == 0 || strcmp(arg, "-and") == 0)
		) {
			/* no special handling required */
		}
		else if (strcmp(arg, "-o") == 0
			USE_DESKTOP(|| strcmp(arg, "-or") == 0)
		) {
			if (need_default)
				(void) ALLOC_ACTION(print);
			cur_group++;
			actions = xrealloc(actions, (cur_group+1) * sizeof(*actions));
			actions[cur_group] = NULL;
			actions[cur_group+1] = NULL;
			cur_action = 0;
			need_default = 1;
		}

	/* --- Options --- */
		else if (strcmp(arg, "-follow") == 0)
			dereference = TRUE;
#if ENABLE_FEATURE_FIND_XDEV
		else if (strcmp(arg, "-xdev") == 0) {
			struct stat stbuf;

			xdev_count = firstopt - 1;
			xdev_dev = xmalloc(xdev_count * sizeof(dev_t));
			for (j = 1; j < firstopt; i++) {
				/* not xstat(): shouldn't bomd out on
				 * "find not_exist exist -xdev" */
				if (stat(argv[j], &stbuf)) stbuf.st_dev = -1L;
				xdev_dev[j-1] = stbuf.st_dev;
			}
		}
#endif
	/* --- Tests and actions --- */
		else if (strcmp(arg, "-print") == 0) {
			need_default = 0;
			(void) ALLOC_ACTION(print);
		}
#if ENABLE_FEATURE_FIND_PRINT0
		else if (strcmp(arg, "-print0") == 0) {
			need_default = 0;
			(void) ALLOC_ACTION(print0);
		}
#endif
		else if (strcmp(arg, "-name") == 0) {
			action_name *ap;
			if (++i == argc)
				bb_error_msg_and_die(bb_msg_requires_arg, arg);
			ap = ALLOC_ACTION(name);
			ap->pattern = arg1;
		}
#if ENABLE_FEATURE_FIND_TYPE
		else if (strcmp(arg, "-type") == 0) {
			action_type *ap;
			if (++i == argc)
				bb_error_msg_and_die(bb_msg_requires_arg, arg);
			ap = ALLOC_ACTION(type);
			ap->type_mask = find_type(arg1);
		}
#endif
#if ENABLE_FEATURE_FIND_PERM
/* TODO:
 * -perm mode   File's permission bits are exactly mode (octal or symbolic).
 *              Symbolic modes use mode 0 as a point of departure.
 * -perm -mode  All of the permission bits mode are set for the file.
 * -perm +mode  Any of the permission bits mode are set for the file.
 */
		else if (strcmp(arg, "-perm") == 0) {
			action_perm *ap;
			if (++i == argc)
				bb_error_msg_and_die(bb_msg_requires_arg, arg);
			ap = ALLOC_ACTION(perm);
			ap->perm_mask = xstrtol_range(arg1, 8, 0, 07777);
			ap->perm_char = arg1[0];
			if (ap->perm_char == '-')
				ap->perm_mask = -ap->perm_mask;
		}
#endif
#if ENABLE_FEATURE_FIND_MTIME
		else if (strcmp(arg, "-mtime") == 0) {
			action_mtime *ap;
			if (++i == argc)
				bb_error_msg_and_die(bb_msg_requires_arg, arg);
			ap = ALLOC_ACTION(mtime);
			ap->mtime_days = xatol(arg1);
			ap->mtime_char = arg1[0];
			if (ap->mtime_char == '-')
				ap->mtime_days = -ap->mtime_days;
		}
#endif
#if ENABLE_FEATURE_FIND_MMIN
		else if (strcmp(arg, "-mmin") == 0) {
			action_mmin *ap;
			if (++i == argc)
				bb_error_msg_and_die(bb_msg_requires_arg, arg);
			ap = ALLOC_ACTION(mmin);
			ap->mmin_mins = xatol(arg1);
			ap->mmin_char = arg1[0];
			if (ap->mmin_char == '-')
				ap->mmin_mins = -ap->mmin_mins;
		}
#endif
#if ENABLE_FEATURE_FIND_NEWER
		else if (strcmp(arg, "-newer") == 0) {
			action_newer *ap;
			struct stat stat_newer;
			if (++i == argc)
				bb_error_msg_and_die(bb_msg_requires_arg, arg);
			xstat(arg1, &stat_newer);
			ap = ALLOC_ACTION(newer);
			ap->newer_mtime = stat_newer.st_mtime;
		}
#endif
#if ENABLE_FEATURE_FIND_INUM
		else if (strcmp(arg, "-inum") == 0) {
			action_inum *ap;
			if (++i == argc)
				bb_error_msg_and_die(bb_msg_requires_arg, arg);
			ap = ALLOC_ACTION(inum);
			ap->inode_num = xatoul(arg1);
		}
#endif
#if ENABLE_FEATURE_FIND_EXEC
		else if (strcmp(arg, "-exec") == 0) {
			action_exec *ap;
			need_default = 0;
			ap = ALLOC_ACTION(exec);
			i++; /* now: argv[i] is the first arg after -exec */
			ap->exec_argv = &argv[i];
			ap->exec_argc = i;
			while (1) {
				if (i == argc) /* did not see ';' till end */
					bb_error_msg_and_die(bb_msg_requires_arg, arg);
				if (argv[i][0] == ';' && argv[i][1] == '\0')
					break;
				i++;
			}
			ap->exec_argc = i - ap->exec_argc; /* number of --exec arguments */
			if (ap->exec_argc == 0)
				bb_error_msg_and_die(bb_msg_requires_arg, arg);
			ap->subst_count = xmalloc(ap->exec_argc * sizeof(int));
			j = ap->exec_argc;
			while (j--)
				ap->subst_count[j] = count_subst(ap->exec_argv[j]);
		}
#endif
		else
			bb_show_usage();
	}

	if (need_default)
		(void) ALLOC_ACTION(print);

	for (i = 1; i < firstopt; i++) {
		if (!recursive_action(argv[i],
				TRUE,           // recurse
				dereference,    // follow links
				FALSE,          // depth first
				fileAction,     // file action
				fileAction,     // dir action
				NULL,           // user data
				0))             // depth
			status = EXIT_FAILURE;
	}
	return status;
}