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-rw-r--r--findutils/find.c582
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diff --git a/findutils/find.c b/findutils/find.c
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1/* vi: set sw=4 ts=4: */
2/*
3 * Mini find implementation for busybox
4 *
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6 *
7 * Reworked by David Douthitt <n9ubh@callsign.net> and
8 * Matt Kraai <kraai@alumni.carnegiemellon.edu>.
9 *
10 * Licensed under the GPL version 2, see the file LICENSE in this tarball.
11 */
12
13/* findutils-4.1.20:
14 *
15 * # find file.txt -exec 'echo {}' '{} {}' ';'
16 * find: echo file.txt: No such file or directory
17 * # find file.txt -exec 'echo' '{} {}' '; '
18 * find: missing argument to `-exec'
19 * # find file.txt -exec 'echo {}' '{} {}' ';' junk
20 * find: paths must precede expression
21 * # find file.txt -exec 'echo {}' '{} {}' ';' junk ';'
22 * find: paths must precede expression
23 * # find file.txt -exec 'echo' '{} {}' ';'
24 * file.txt file.txt
25 * (strace: execve("/bin/echo", ["echo", "file.txt file.txt"], [ 30 vars ]))
26 * # find file.txt -exec 'echo' '{} {}' ';' -print -exec pwd ';'
27 * file.txt file.txt
28 * file.txt
29 * /tmp
30 * # find -name '*.c' -o -name '*.h'
31 * [shows files, *.c and *.h intermixed]
32 * # find file.txt -name '*f*' -o -name '*t*'
33 * file.txt
34 * # find file.txt -name '*z*' -o -name '*t*'
35 * file.txt
36 * # find file.txt -name '*f*' -o -name '*z*'
37 * file.txt
38 *
39 * # find t z -name '*t*' -print -o -name '*z*'
40 * t
41 * # find t z t z -name '*t*' -o -name '*z*' -print
42 * z
43 * z
44 * # find t z t z '(' -name '*t*' -o -name '*z*' ')' -o -print
45 * (no output)
46 */
47
48#include "busybox.h"
49#include <fnmatch.h>
50
51USE_FEATURE_FIND_XDEV(static dev_t *xdev_dev;)
52USE_FEATURE_FIND_XDEV(static int xdev_count;)
53
54typedef int (*action_fp)(const char *fileName, struct stat *statbuf, void *);
55
56typedef struct {
57 action_fp f;
58} action;
59#define ACTS(name, arg...) typedef struct { action a; arg; } action_##name;
60#define ACTF(name) static int func_##name(const char *fileName, struct stat *statbuf, action_##name* ap)
61 ACTS(print)
62 ACTS(name, char *pattern;)
63USE_FEATURE_FIND_PRINT0(ACTS(print0))
64USE_FEATURE_FIND_TYPE( ACTS(type, int type_mask;))
65USE_FEATURE_FIND_PERM( ACTS(perm, char perm_char; int perm_mask;))
66USE_FEATURE_FIND_MTIME( ACTS(mtime, char mtime_char; int mtime_days;))
67USE_FEATURE_FIND_MMIN( ACTS(mmin, char mmin_char; int mmin_mins;))
68USE_FEATURE_FIND_NEWER( ACTS(newer, time_t newer_mtime;))
69USE_FEATURE_FIND_INUM( ACTS(inum, ino_t inode_num;))
70USE_FEATURE_FIND_EXEC( ACTS(exec, char **exec_argv; int *subst_count; int exec_argc;))
71USE_DESKTOP( ACTS(paren, action ***subexpr;))
72USE_DESKTOP( ACTS(size, off_t size;))
73USE_DESKTOP( ACTS(prune))
74
75static action ***actions;
76static int need_print = 1;
77
78static inline int one_char(const char* str, char c)
79{
80 return (str[0] == c && str[1] == '\0');
81}
82
83
84static int count_subst(const char *str)
85{
86 int count = 0;
87 while ((str = strstr(str, "{}"))) {
88 count++;
89 str++;
90 }
91 return count;
92}
93
94
95static char* subst(const char *src, int count, const char* filename)
96{
97 char *buf, *dst, *end;
98 int flen = strlen(filename);
99 /* we replace each '{}' with filename: growth by strlen-2 */
100 buf = dst = xmalloc(strlen(src) + count*(flen-2) + 1);
101 while ((end = strstr(src, "{}"))) {
102 memcpy(dst, src, end - src);
103 dst += end - src;
104 src = end + 2;
105 memcpy(dst, filename, flen);
106 dst += flen;
107 }
108 strcpy(dst, src);
109 return buf;
110}
111
112
113static int exec_actions(action ***appp, const char *fileName, struct stat *statbuf)
114{
115 int cur_group;
116 int cur_action;
117 int rc = TRUE;
118 action **app, *ap;
119
120 cur_group = -1;
121 while ((app = appp[++cur_group])) {
122 cur_action = -1;
123 do {
124 ap = app[++cur_action];
125 } while (ap && (rc = ap->f(fileName, statbuf, ap)));
126 if (!ap) {
127 /* all actions in group were successful */
128 break;
129 }
130 }
131 return rc;
132}
133
134
135ACTF(name)
136{
137 const char *tmp = strrchr(fileName, '/');
138 if (tmp == NULL)
139 tmp = fileName;
140 else
141 tmp++;
142 return fnmatch(ap->pattern, tmp, FNM_PERIOD) == 0;
143}
144#if ENABLE_FEATURE_FIND_TYPE
145ACTF(type)
146{
147 return ((statbuf->st_mode & S_IFMT) == ap->type_mask);
148}
149#endif
150#if ENABLE_FEATURE_FIND_PERM
151ACTF(perm)
152{
153 return !((isdigit(ap->perm_char) && (statbuf->st_mode & 07777) == ap->perm_mask)
154 || (ap->perm_char == '-' && (statbuf->st_mode & ap->perm_mask) == ap->perm_mask)
155 || (ap->perm_char == '+' && (statbuf->st_mode & ap->perm_mask) != 0));
156}
157#endif
158#if ENABLE_FEATURE_FIND_MTIME
159ACTF(mtime)
160{
161 time_t file_age = time(NULL) - statbuf->st_mtime;
162 time_t mtime_secs = ap->mtime_days * 24 * 60 * 60;
163 return !((isdigit(ap->mtime_char) && file_age >= mtime_secs
164 && file_age < mtime_secs + 24 * 60 * 60)
165 || (ap->mtime_char == '+' && file_age >= mtime_secs + 24 * 60 * 60)
166 || (ap->mtime_char == '-' && file_age < mtime_secs));
167}
168#endif
169#if ENABLE_FEATURE_FIND_MMIN
170ACTF(mmin)
171{
172 time_t file_age = time(NULL) - statbuf->st_mtime;
173 time_t mmin_secs = ap->mmin_mins * 60;
174 return !((isdigit(ap->mmin_char) && file_age >= mmin_secs
175 && file_age < mmin_secs + 60)
176 || (ap->mmin_char == '+' && file_age >= mmin_secs + 60)
177 || (ap->mmin_char == '-' && file_age < mmin_secs));
178}
179#endif
180#if ENABLE_FEATURE_FIND_NEWER
181ACTF(newer)
182{
183 return (ap->newer_mtime >= statbuf->st_mtime);
184}
185#endif
186#if ENABLE_FEATURE_FIND_INUM
187ACTF(inum)
188{
189 return (statbuf->st_ino != ap->inode_num);
190}
191#endif
192#if ENABLE_FEATURE_FIND_EXEC
193ACTF(exec)
194{
195 int i, rc;
196 char *argv[ap->exec_argc+1];
197 for (i = 0; i < ap->exec_argc; i++)
198 argv[i] = subst(ap->exec_argv[i], ap->subst_count[i], fileName);
199 argv[i] = NULL; /* terminate the list */
200 errno = 0;
201 rc = wait4pid(spawn(argv));
202 if (errno)
203 bb_perror_msg("%s", argv[0]);
204 for (i = 0; i < ap->exec_argc; i++)
205 free(argv[i]);
206 return rc == 0; /* return 1 if success */
207}
208#endif
209
210#if ENABLE_FEATURE_FIND_PRINT0
211ACTF(print0)
212{
213 printf("%s%c", fileName, '\0');
214 return TRUE;
215}
216#endif
217
218ACTF(print)
219{
220 puts(fileName);
221 return TRUE;
222}
223
224#if ENABLE_DESKTOP
225ACTF(paren)
226{
227 return exec_actions(ap->subexpr, fileName, statbuf);
228}
229
230/*
231 * -prune: if -depth is not given, return true and do not descend
232 * current dir; if -depth is given, return false with no effect.
233 * Example:
234 * find dir -name 'asm-*' -prune -o -name '*.[chS]' -print
235 */
236ACTF(prune)
237{
238 return SKIP;
239}
240
241ACTF(size)
242{
243 return statbuf->st_size == ap->size;
244}
245#endif
246
247
248static int fileAction(const char *fileName, struct stat *statbuf, void* junk, int depth)
249{
250 int rc;
251#ifdef CONFIG_FEATURE_FIND_XDEV
252 if (S_ISDIR(statbuf->st_mode) && xdev_count) {
253 int i;
254 for (i = 0; i < xdev_count; i++) {
255 if (xdev_dev[i] != statbuf->st_dev)
256 return SKIP;
257 }
258 }
259#endif
260 rc = exec_actions(actions, fileName, statbuf);
261 /* Had no explicit -print[0] or -exec? then print */
262 if (rc && need_print)
263 puts(fileName);
264 /* Cannot return 0: our caller, recursive_action(),
265 * will perror() and skip dirs (if called on dir) */
266 return rc == 0 ? TRUE : rc;
267}
268
269
270#if ENABLE_FEATURE_FIND_TYPE
271static int find_type(char *type)
272{
273 int mask = 0;
274
275 switch (type[0]) {
276 case 'b':
277 mask = S_IFBLK;
278 break;
279 case 'c':
280 mask = S_IFCHR;
281 break;
282 case 'd':
283 mask = S_IFDIR;
284 break;
285 case 'p':
286 mask = S_IFIFO;
287 break;
288 case 'f':
289 mask = S_IFREG;
290 break;
291 case 'l':
292 mask = S_IFLNK;
293 break;
294 case 's':
295 mask = S_IFSOCK;
296 break;
297 }
298
299 if (mask == 0 || type[1] != '\0')
300 bb_error_msg_and_die(bb_msg_invalid_arg, type, "-type");
301
302 return mask;
303}
304#endif
305
306action*** parse_params(char **argv)
307{
308 action*** appp;
309 int cur_group = 0;
310 int cur_action = 0;
311
312 action* alloc_action(int sizeof_struct, action_fp f)
313 {
314 action *ap;
315 appp[cur_group] = xrealloc(appp[cur_group], (cur_action+2) * sizeof(*appp));
316 appp[cur_group][cur_action++] = ap = xmalloc(sizeof_struct);
317 appp[cur_group][cur_action] = NULL;
318 ap->f = f;
319 return ap;
320 }
321#define ALLOC_ACTION(name) (action_##name*)alloc_action(sizeof(action_##name), (action_fp) func_##name)
322
323 appp = xzalloc(2 * sizeof(*appp)); /* appp[0],[1] == NULL */
324
325// Actions have side effects and return a true or false value
326// We implement: -print, -print0, -exec
327
328// The rest are tests.
329
330// Tests and actions are grouped by operators
331// ( expr ) Force precedence
332// ! expr True if expr is false
333// -not expr Same as ! expr
334// expr1 [-a[nd]] expr2 And; expr2 is not evaluated if expr1 is false
335// expr1 -o[r] expr2 Or; expr2 is not evaluated if expr1 is true
336// expr1 , expr2 List; both expr1 and expr2 are always evaluated
337// We implement: (), -a, -o
338
339 while (*argv) {
340 char *arg = argv[0];
341 char *arg1 = argv[1];
342 /* --- Operators --- */
343 if (strcmp(arg, "-a") == 0
344 USE_DESKTOP(|| strcmp(arg, "-and") == 0)
345 ) {
346 /* no special handling required */
347 }
348 else if (strcmp(arg, "-o") == 0
349 USE_DESKTOP(|| strcmp(arg, "-or") == 0)
350 ) {
351 /* start new OR group */
352 cur_group++;
353 appp = xrealloc(appp, (cur_group+2) * sizeof(*appp));
354 appp[cur_group] = NULL;
355 appp[cur_group+1] = NULL;
356 cur_action = 0;
357 }
358
359 /* --- Tests and actions --- */
360 else if (strcmp(arg, "-print") == 0) {
361 need_print = 0;
362 (void) ALLOC_ACTION(print);
363 }
364#if ENABLE_FEATURE_FIND_PRINT0
365 else if (strcmp(arg, "-print0") == 0) {
366 need_print = 0;
367 (void) ALLOC_ACTION(print0);
368 }
369#endif
370 else if (strcmp(arg, "-name") == 0) {
371 action_name *ap;
372 if (!*++argv)
373 bb_error_msg_and_die(bb_msg_requires_arg, arg);
374 ap = ALLOC_ACTION(name);
375 ap->pattern = arg1;
376 }
377#if ENABLE_FEATURE_FIND_TYPE
378 else if (strcmp(arg, "-type") == 0) {
379 action_type *ap;
380 if (!*++argv)
381 bb_error_msg_and_die(bb_msg_requires_arg, arg);
382 ap = ALLOC_ACTION(type);
383 ap->type_mask = find_type(arg1);
384 }
385#endif
386#if ENABLE_FEATURE_FIND_PERM
387/* TODO:
388 * -perm mode File's permission bits are exactly mode (octal or symbolic).
389 * Symbolic modes use mode 0 as a point of departure.
390 * -perm -mode All of the permission bits mode are set for the file.
391 * -perm +mode Any of the permission bits mode are set for the file.
392 */
393 else if (strcmp(arg, "-perm") == 0) {
394 action_perm *ap;
395 if (!*++argv)
396 bb_error_msg_and_die(bb_msg_requires_arg, arg);
397 ap = ALLOC_ACTION(perm);
398 ap->perm_mask = xstrtol_range(arg1, 8, 0, 07777);
399 ap->perm_char = arg1[0];
400 if (ap->perm_char == '-')
401 ap->perm_mask = -ap->perm_mask;
402 }
403#endif
404#if ENABLE_FEATURE_FIND_MTIME
405 else if (strcmp(arg, "-mtime") == 0) {
406 action_mtime *ap;
407 if (!*++argv)
408 bb_error_msg_and_die(bb_msg_requires_arg, arg);
409 ap = ALLOC_ACTION(mtime);
410 ap->mtime_days = xatol(arg1);
411 ap->mtime_char = arg1[0];
412 if (ap->mtime_char == '-')
413 ap->mtime_days = -ap->mtime_days;
414 }
415#endif
416#if ENABLE_FEATURE_FIND_MMIN
417 else if (strcmp(arg, "-mmin") == 0) {
418 action_mmin *ap;
419 if (!*++argv)
420 bb_error_msg_and_die(bb_msg_requires_arg, arg);
421 ap = ALLOC_ACTION(mmin);
422 ap->mmin_mins = xatol(arg1);
423 ap->mmin_char = arg1[0];
424 if (ap->mmin_char == '-')
425 ap->mmin_mins = -ap->mmin_mins;
426 }
427#endif
428#if ENABLE_FEATURE_FIND_NEWER
429 else if (strcmp(arg, "-newer") == 0) {
430 action_newer *ap;
431 struct stat stat_newer;
432 if (!*++argv)
433 bb_error_msg_and_die(bb_msg_requires_arg, arg);
434 xstat(arg1, &stat_newer);
435 ap = ALLOC_ACTION(newer);
436 ap->newer_mtime = stat_newer.st_mtime;
437 }
438#endif
439#if ENABLE_FEATURE_FIND_INUM
440 else if (strcmp(arg, "-inum") == 0) {
441 action_inum *ap;
442 if (!*++argv)
443 bb_error_msg_and_die(bb_msg_requires_arg, arg);
444 ap = ALLOC_ACTION(inum);
445 ap->inode_num = xatoul(arg1);
446 }
447#endif
448#if ENABLE_FEATURE_FIND_EXEC
449 else if (strcmp(arg, "-exec") == 0) {
450 int i;
451 action_exec *ap;
452 need_print = 0;
453 ap = ALLOC_ACTION(exec);
454 ap->exec_argv = ++argv; /* first arg after -exec */
455 ap->exec_argc = 0;
456 while (1) {
457 if (!*argv) /* did not see ';' till end */
458 bb_error_msg_and_die(bb_msg_requires_arg, arg);
459 if (one_char(argv[0], ';'))
460 break;
461 argv++;
462 ap->exec_argc++;
463 }
464 if (ap->exec_argc == 0)
465 bb_error_msg_and_die(bb_msg_requires_arg, arg);
466 ap->subst_count = xmalloc(ap->exec_argc * sizeof(int));
467 i = ap->exec_argc;
468 while (i--)
469 ap->subst_count[i] = count_subst(ap->exec_argv[i]);
470 }
471#endif
472#if ENABLE_DESKTOP
473 else if (one_char(arg, '(')) {
474 action_paren *ap;
475 char **endarg;
476 int nested = 1;
477
478 endarg = argv;
479 while (1) {
480 if (!*++endarg)
481 bb_error_msg_and_die("unpaired '('");
482 if (one_char(*endarg, '('))
483 nested++;
484 else if (one_char(*endarg, ')') && !--nested) {
485 *endarg = NULL;
486 break;
487 }
488 }
489 ap = ALLOC_ACTION(paren);
490 ap->subexpr = parse_params(argv + 1);
491 *endarg = ")"; /* restore NULLed parameter */
492 argv = endarg;
493 }
494 else if (strcmp(arg, "-prune") == 0) {
495 (void) ALLOC_ACTION(prune);
496 }
497 else if (strcmp(arg, "-size") == 0) {
498 action_size *ap;
499 if (!*++argv)
500 bb_error_msg_and_die(bb_msg_requires_arg, arg);
501 ap = ALLOC_ACTION(size);
502 ap->size = XATOOFF(arg1);
503 }
504#endif
505 else
506 bb_show_usage();
507 argv++;
508 }
509
510 return appp;
511#undef ALLOC_ACTION
512}
513
514
515int find_main(int argc, char **argv)
516{
517 int dereference = FALSE;
518 char *arg;
519 char **argp;
520 int i, firstopt, status = EXIT_SUCCESS;
521
522 for (firstopt = 1; firstopt < argc; firstopt++) {
523 if (argv[firstopt][0] == '-')
524 break;
525#if ENABLE_DESKTOP
526 if (one_char(argv[firstopt], '('))
527 break;
528#endif
529 }
530 if (firstopt == 1) {
531 argv[0] = ".";
532 argv--;
533 firstopt++;
534 }
535
536// All options always return true. They always take effect,
537// rather than being processed only when their place in the
538// expression is reached
539// We implement: -follow, -xdev
540
541 /* Process options, and replace then with -a */
542 /* (-a will be ignored by recursive parser later) */
543 argp = &argv[firstopt];
544 while ((arg = argp[0])) {
545 if (strcmp(arg, "-follow") == 0) {
546 dereference = TRUE;
547 argp[0] = "-a";
548 }
549#if ENABLE_FEATURE_FIND_XDEV
550 else if (strcmp(arg, "-xdev") == 0) {
551 struct stat stbuf;
552 if (!xdev_count) {
553 xdev_count = firstopt - 1;
554 xdev_dev = xmalloc(xdev_count * sizeof(dev_t));
555 for (i = 1; i < firstopt; i++) {
556 /* not xstat(): shouldn't bomb out on
557 * "find not_exist exist -xdev" */
558 if (stat(argv[i], &stbuf)) stbuf.st_dev = -1L;
559 xdev_dev[i-1] = stbuf.st_dev;
560 }
561 }
562 argp[0] = "-a";
563 }
564 argp++;
565 }
566#endif
567
568 actions = parse_params(&argv[firstopt]);
569
570 for (i = 1; i < firstopt; i++) {
571 if (!recursive_action(argv[i],
572 TRUE, // recurse
573 dereference, // follow links
574 FALSE, // depth first
575 fileAction, // file action
576 fileAction, // dir action
577 NULL, // user data
578 0)) // depth
579 status = EXIT_FAILURE;
580 }
581 return status;
582}