1 /* vi: set sw=4 ts=4: */
3 * Mini find implementation for busybox
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
7 * Reworked by David Douthitt <n9ubh@callsign.net> and
8 * Matt Kraai <kraai@alumni.carnegiemellon.edu>.
10 * Licensed under the GPL version 2, see the file LICENSE in this tarball.
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' '{} {}' ';'
25 * (strace: execve("/bin/echo", ["echo", "file.txt file.txt"], [ 30 vars ]))
26 * # find file.txt -exec 'echo' '{} {}' ';' -print -exec pwd ';'
30 * # find -name '*.c' -o -name '*.h'
31 * [shows files, *.c and *.h intermixed]
32 * # find file.txt -name '*f*' -o -name '*t*'
34 * # find file.txt -name '*z*' -o -name '*t*'
36 * # find file.txt -name '*f*' -o -name '*z*'
39 * # find t z -name '*t*' -print -o -name '*z*'
41 * # find t z t z -name '*t*' -o -name '*z*' -print
44 * # find t z t z '(' -name '*t*' -o -name '*z*' ')' -o -print
51 USE_FEATURE_FIND_XDEV(static dev_t *xdev_dev;)
52 USE_FEATURE_FIND_XDEV(static int xdev_count;)
54 typedef int (*action_fp)(const char *fileName, struct stat *statbuf, void *);
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)
62 ACTS(name, const char *pattern;)
63 USE_FEATURE_FIND_PRINT0(ACTS(print0))
64 USE_FEATURE_FIND_TYPE( ACTS(type, int type_mask;))
65 USE_FEATURE_FIND_PERM( ACTS(perm, char perm_char; mode_t perm_mask;))
66 USE_FEATURE_FIND_MTIME( ACTS(mtime, char mtime_char; unsigned mtime_days;))
67 USE_FEATURE_FIND_MMIN( ACTS(mmin, char mmin_char; unsigned mmin_mins;))
68 USE_FEATURE_FIND_NEWER( ACTS(newer, time_t newer_mtime;))
69 USE_FEATURE_FIND_INUM( ACTS(inum, ino_t inode_num;))
70 USE_FEATURE_FIND_EXEC( ACTS(exec, char **exec_argv; int *subst_count; int exec_argc;))
71 USE_DESKTOP( ACTS(paren, action ***subexpr;))
72 USE_DESKTOP( ACTS(size, off_t size;))
73 USE_DESKTOP( ACTS(prune))
75 static action ***actions;
76 static int need_print = 1;
79 #if ENABLE_FEATURE_FIND_EXEC
80 static int count_subst(const char *str)
83 while ((str = strstr(str, "{}"))) {
91 static char* subst(const char *src, int count, const char* filename)
93 char *buf, *dst, *end;
94 int flen = strlen(filename);
95 /* we replace each '{}' with filename: growth by strlen-2 */
96 buf = dst = xmalloc(strlen(src) + count*(flen-2) + 1);
97 while ((end = strstr(src, "{}"))) {
98 memcpy(dst, src, end - src);
101 memcpy(dst, filename, flen);
110 static int exec_actions(action ***appp, const char *fileName, struct stat *statbuf)
118 while ((app = appp[++cur_group])) {
121 ap = app[++cur_action];
122 } while (ap && (rc = ap->f(fileName, statbuf, ap)));
124 /* all actions in group were successful */
134 const char *tmp = strrchr(fileName, '/');
139 return fnmatch(ap->pattern, tmp, FNM_PERIOD) == 0;
141 #if ENABLE_FEATURE_FIND_TYPE
144 return ((statbuf->st_mode & S_IFMT) == ap->type_mask);
147 #if ENABLE_FEATURE_FIND_PERM
150 /* -perm +mode: at least one of perm_mask bits are set */
151 if (ap->perm_char == '+')
152 return (statbuf->st_mode & ap->perm_mask) != 0;
153 /* -perm -mode: all of perm_mask are set */
154 if (ap->perm_char == '-')
155 return (statbuf->st_mode & ap->perm_mask) == ap->perm_mask;
156 /* -perm mode: file mode must match perm_mask */
157 return (statbuf->st_mode & 07777) == ap->perm_mask;
160 #if ENABLE_FEATURE_FIND_MTIME
163 time_t file_age = time(NULL) - statbuf->st_mtime;
164 time_t mtime_secs = ap->mtime_days * 24*60*60;
165 if (ap->mtime_char == '+')
166 return file_age >= mtime_secs + 24*60*60;
167 if (ap->mtime_char == '-')
168 return file_age < mtime_secs;
169 /* just numeric mtime */
170 return file_age >= mtime_secs && file_age < (mtime_secs + 24*60*60);
173 #if ENABLE_FEATURE_FIND_MMIN
176 time_t file_age = time(NULL) - statbuf->st_mtime;
177 time_t mmin_secs = ap->mmin_mins * 60;
178 if (ap->mmin_char == '+')
179 return file_age >= mmin_secs + 60;
180 if (ap->mmin_char == '-')
181 return file_age < mmin_secs;
182 /* just numeric mmin */
183 return file_age >= mmin_secs && file_age < (mmin_secs + 60);
186 #if ENABLE_FEATURE_FIND_NEWER
189 return (ap->newer_mtime < statbuf->st_mtime);
192 #if ENABLE_FEATURE_FIND_INUM
195 return (statbuf->st_ino == ap->inode_num);
198 #if ENABLE_FEATURE_FIND_EXEC
202 char *argv[ap->exec_argc+1];
203 for (i = 0; i < ap->exec_argc; i++)
204 argv[i] = subst(ap->exec_argv[i], ap->subst_count[i], fileName);
205 argv[i] = NULL; /* terminate the list */
206 rc = wait4pid(spawn(argv));
208 bb_perror_msg("%s", argv[0]);
209 for (i = 0; i < ap->exec_argc; i++)
211 return rc == 0; /* return 1 if success */
215 #if ENABLE_FEATURE_FIND_PRINT0
218 printf("%s%c", fileName, '\0');
232 return exec_actions(ap->subexpr, fileName, statbuf);
236 * -prune: if -depth is not given, return true and do not descend
237 * current dir; if -depth is given, return false with no effect.
239 * find dir -name 'asm-*' -prune -o -name '*.[chS]' -print
248 return statbuf->st_size == ap->size;
253 static int fileAction(const char *fileName, struct stat *statbuf, void* junk, int depth)
256 #ifdef CONFIG_FEATURE_FIND_XDEV
257 if (S_ISDIR(statbuf->st_mode) && xdev_count) {
259 for (i = 0; i < xdev_count; i++) {
260 if (xdev_dev[i] != statbuf->st_dev)
265 rc = exec_actions(actions, fileName, statbuf);
266 /* Had no explicit -print[0] or -exec? then print */
267 if (rc && need_print)
269 /* Cannot return 0: our caller, recursive_action(),
270 * will perror() and skip dirs (if called on dir) */
271 return rc == 0 ? TRUE : rc;
275 #if ENABLE_FEATURE_FIND_TYPE
276 static int find_type(const char *type)
304 if (mask == 0 || type[1] != '\0')
305 bb_error_msg_and_die(bb_msg_invalid_arg, type, "-type");
311 static const char* plus_minus_num(const char* str)
313 if (*str == '-' || *str == '+')
318 static action*** parse_params(char **argv)
324 action* alloc_action(int sizeof_struct, action_fp f)
327 appp[cur_group] = xrealloc(appp[cur_group], (cur_action+2) * sizeof(*appp));
328 appp[cur_group][cur_action++] = ap = xmalloc(sizeof_struct);
329 appp[cur_group][cur_action] = NULL;
333 #define ALLOC_ACTION(name) (action_##name*)alloc_action(sizeof(action_##name), (action_fp) func_##name)
335 appp = xzalloc(2 * sizeof(*appp)); /* appp[0],[1] == NULL */
337 // Actions have side effects and return a true or false value
338 // We implement: -print, -print0, -exec
340 // The rest are tests.
342 // Tests and actions are grouped by operators
343 // ( expr ) Force precedence
344 // ! expr True if expr is false
345 // -not expr Same as ! expr
346 // expr1 [-a[nd]] expr2 And; expr2 is not evaluated if expr1 is false
347 // expr1 -o[r] expr2 Or; expr2 is not evaluated if expr1 is true
348 // expr1 , expr2 List; both expr1 and expr2 are always evaluated
349 // We implement: (), -a, -o
352 const char *arg = argv[0];
353 const char *arg1 = argv[1];
354 /* --- Operators --- */
355 if (strcmp(arg, "-a") == 0
356 USE_DESKTOP(|| strcmp(arg, "-and") == 0)
358 /* no special handling required */
360 else if (strcmp(arg, "-o") == 0
361 USE_DESKTOP(|| strcmp(arg, "-or") == 0)
363 /* start new OR group */
365 appp = xrealloc(appp, (cur_group+2) * sizeof(*appp));
366 appp[cur_group] = NULL;
367 appp[cur_group+1] = NULL;
371 /* --- Tests and actions --- */
372 else if (strcmp(arg, "-print") == 0) {
374 (void) ALLOC_ACTION(print);
376 #if ENABLE_FEATURE_FIND_PRINT0
377 else if (strcmp(arg, "-print0") == 0) {
379 (void) ALLOC_ACTION(print0);
382 else if (strcmp(arg, "-name") == 0) {
385 bb_error_msg_and_die(bb_msg_requires_arg, arg);
386 ap = ALLOC_ACTION(name);
389 #if ENABLE_FEATURE_FIND_TYPE
390 else if (strcmp(arg, "-type") == 0) {
393 bb_error_msg_and_die(bb_msg_requires_arg, arg);
394 ap = ALLOC_ACTION(type);
395 ap->type_mask = find_type(arg1);
398 #if ENABLE_FEATURE_FIND_PERM
400 * -perm mode File's permission bits are exactly mode (octal or symbolic).
401 * Symbolic modes use mode 0 as a point of departure.
402 * -perm -mode All of the permission bits mode are set for the file.
403 * -perm +mode Any of the permission bits mode are set for the file.
405 else if (strcmp(arg, "-perm") == 0) {
408 bb_error_msg_and_die(bb_msg_requires_arg, arg);
409 ap = ALLOC_ACTION(perm);
410 ap->perm_char = arg1[0];
411 arg1 = plus_minus_num(arg1);
413 if (!bb_parse_mode(arg1, &ap->perm_mask))
414 bb_error_msg_and_die("invalid mode: %s", arg1);
417 #if ENABLE_FEATURE_FIND_MTIME
418 else if (strcmp(arg, "-mtime") == 0) {
421 bb_error_msg_and_die(bb_msg_requires_arg, arg);
422 ap = ALLOC_ACTION(mtime);
423 ap->mtime_char = arg1[0];
424 ap->mtime_days = xatoul(plus_minus_num(arg1));
427 #if ENABLE_FEATURE_FIND_MMIN
428 else if (strcmp(arg, "-mmin") == 0) {
431 bb_error_msg_and_die(bb_msg_requires_arg, arg);
432 ap = ALLOC_ACTION(mmin);
433 ap->mmin_char = arg1[0];
434 ap->mmin_mins = xatoul(plus_minus_num(arg1));
437 #if ENABLE_FEATURE_FIND_NEWER
438 else if (strcmp(arg, "-newer") == 0) {
440 struct stat stat_newer;
442 bb_error_msg_and_die(bb_msg_requires_arg, arg);
443 xstat(arg1, &stat_newer);
444 ap = ALLOC_ACTION(newer);
445 ap->newer_mtime = stat_newer.st_mtime;
448 #if ENABLE_FEATURE_FIND_INUM
449 else if (strcmp(arg, "-inum") == 0) {
452 bb_error_msg_and_die(bb_msg_requires_arg, arg);
453 ap = ALLOC_ACTION(inum);
454 ap->inode_num = xatoul(arg1);
457 #if ENABLE_FEATURE_FIND_EXEC
458 else if (strcmp(arg, "-exec") == 0) {
462 ap = ALLOC_ACTION(exec);
463 ap->exec_argv = ++argv; /* first arg after -exec */
466 if (!*argv) /* did not see ';' till end */
467 bb_error_msg_and_die(bb_msg_requires_arg, arg);
468 if (LONE_CHAR(argv[0], ';'))
473 if (ap->exec_argc == 0)
474 bb_error_msg_and_die(bb_msg_requires_arg, arg);
475 ap->subst_count = xmalloc(ap->exec_argc * sizeof(int));
478 ap->subst_count[i] = count_subst(ap->exec_argv[i]);
482 else if (LONE_CHAR(arg, '(')) {
490 bb_error_msg_and_die("unpaired '('");
491 if (LONE_CHAR(*endarg, '('))
493 else if (LONE_CHAR(*endarg, ')') && !--nested) {
498 ap = ALLOC_ACTION(paren);
499 ap->subexpr = parse_params(argv + 1);
500 *endarg = ")"; /* restore NULLed parameter */
503 else if (strcmp(arg, "-prune") == 0) {
504 (void) ALLOC_ACTION(prune);
506 else if (strcmp(arg, "-size") == 0) {
509 bb_error_msg_and_die(bb_msg_requires_arg, arg);
510 ap = ALLOC_ACTION(size);
511 ap->size = XATOOFF(arg1);
524 int find_main(int argc, char **argv)
526 int dereference = FALSE;
529 int i, firstopt, status = EXIT_SUCCESS;
531 for (firstopt = 1; firstopt < argc; firstopt++) {
532 if (argv[firstopt][0] == '-')
535 if (LONE_CHAR(argv[firstopt], '('))
545 // All options always return true. They always take effect,
546 // rather than being processed only when their place in the
547 // expression is reached
548 // We implement: -follow, -xdev
550 /* Process options, and replace then with -a */
551 /* (-a will be ignored by recursive parser later) */
552 argp = &argv[firstopt];
553 while ((arg = argp[0])) {
554 if (strcmp(arg, "-follow") == 0) {
558 #if ENABLE_FEATURE_FIND_XDEV
559 else if (strcmp(arg, "-xdev") == 0) {
562 xdev_count = firstopt - 1;
563 xdev_dev = xmalloc(xdev_count * sizeof(dev_t));
564 for (i = 1; i < firstopt; i++) {
565 /* not xstat(): shouldn't bomb out on
566 * "find not_exist exist -xdev" */
567 if (stat(argv[i], &stbuf))
569 xdev_dev[i-1] = stbuf.st_dev;
578 actions = parse_params(&argv[firstopt]);
580 for (i = 1; i < firstopt; i++) {
581 if (!recursive_action(argv[i],
583 dereference, // follow links
584 FALSE, // depth first
585 fileAction, // file action
586 fileAction, // dir action
589 status = EXIT_FAILURE;