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 *);
58 #if ENABLE_FEATURE_FIND_NOT
62 #define ACTS(name, arg...) typedef struct { action a; arg; } action_##name;
63 #define ACTF(name) static int func_##name(const char *fileName, struct stat *statbuf, action_##name* ap)
65 ACTS(name, const char *pattern;)
66 USE_FEATURE_FIND_PRINT0(ACTS(print0))
67 USE_FEATURE_FIND_TYPE( ACTS(type, int type_mask;))
68 USE_FEATURE_FIND_PERM( ACTS(perm, char perm_char; mode_t perm_mask;))
69 USE_FEATURE_FIND_MTIME( ACTS(mtime, char mtime_char; unsigned mtime_days;))
70 USE_FEATURE_FIND_MMIN( ACTS(mmin, char mmin_char; unsigned mmin_mins;))
71 USE_FEATURE_FIND_NEWER( ACTS(newer, time_t newer_mtime;))
72 USE_FEATURE_FIND_INUM( ACTS(inum, ino_t inode_num;))
73 USE_FEATURE_FIND_EXEC( ACTS(exec, char **exec_argv; unsigned int *subst_count; int exec_argc;))
74 USE_FEATURE_FIND_USER( ACTS(user, int uid;))
75 USE_DESKTOP( ACTS(paren, action ***subexpr;))
76 USE_DESKTOP( ACTS(size, off_t size;))
77 USE_DESKTOP( ACTS(prune))
79 static action ***actions;
80 static bool need_print = 1;
83 #if ENABLE_FEATURE_FIND_EXEC
84 static unsigned int count_subst(const char *str)
86 unsigned int count = 0;
87 while ((str = strstr(str, "{}"))) {
95 static char* subst(const char *src, unsigned int count, const char* filename)
97 char *buf, *dst, *end;
98 size_t 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);
105 memcpy(dst, filename, flen);
114 static int exec_actions(action ***appp, const char *fileName, struct stat *statbuf)
122 while ((app = appp[++cur_group])) {
125 ap = app[++cur_action];
127 /* all actions in group were successful */
130 rc = ap->f(fileName, statbuf, ap);
131 #if ENABLE_FEATURE_FIND_NOT
132 if (ap->invert) rc = !rc;
135 /* current group failed, try next */
146 const char *tmp = strrchr(fileName, '/');
151 return fnmatch(ap->pattern, tmp, FNM_PERIOD) == 0;
153 #if ENABLE_FEATURE_FIND_TYPE
156 return ((statbuf->st_mode & S_IFMT) == ap->type_mask);
159 #if ENABLE_FEATURE_FIND_PERM
162 /* -perm +mode: at least one of perm_mask bits are set */
163 if (ap->perm_char == '+')
164 return (statbuf->st_mode & ap->perm_mask) != 0;
165 /* -perm -mode: all of perm_mask are set */
166 if (ap->perm_char == '-')
167 return (statbuf->st_mode & ap->perm_mask) == ap->perm_mask;
168 /* -perm mode: file mode must match perm_mask */
169 return (statbuf->st_mode & 07777) == ap->perm_mask;
172 #if ENABLE_FEATURE_FIND_MTIME
175 time_t file_age = time(NULL) - statbuf->st_mtime;
176 time_t mtime_secs = ap->mtime_days * 24*60*60;
177 if (ap->mtime_char == '+')
178 return file_age >= mtime_secs + 24*60*60;
179 if (ap->mtime_char == '-')
180 return file_age < mtime_secs;
181 /* just numeric mtime */
182 return file_age >= mtime_secs && file_age < (mtime_secs + 24*60*60);
185 #if ENABLE_FEATURE_FIND_MMIN
188 time_t file_age = time(NULL) - statbuf->st_mtime;
189 time_t mmin_secs = ap->mmin_mins * 60;
190 if (ap->mmin_char == '+')
191 return file_age >= mmin_secs + 60;
192 if (ap->mmin_char == '-')
193 return file_age < mmin_secs;
194 /* just numeric mmin */
195 return file_age >= mmin_secs && file_age < (mmin_secs + 60);
198 #if ENABLE_FEATURE_FIND_NEWER
201 return (ap->newer_mtime < statbuf->st_mtime);
204 #if ENABLE_FEATURE_FIND_INUM
207 return (statbuf->st_ino == ap->inode_num);
210 #if ENABLE_FEATURE_FIND_EXEC
214 char *argv[ap->exec_argc+1];
215 for (i = 0; i < ap->exec_argc; i++)
216 argv[i] = subst(ap->exec_argv[i], ap->subst_count[i], fileName);
217 argv[i] = NULL; /* terminate the list */
218 rc = wait4pid(spawn(argv));
220 bb_perror_msg("%s", argv[0]);
221 for (i = 0; i < ap->exec_argc; i++)
223 return rc == 0; /* return 1 if success */
227 #if ENABLE_FEATURE_FIND_USER
230 return (statbuf->st_uid == ap->uid);
234 #if ENABLE_FEATURE_FIND_PRINT0
237 printf("%s%c", fileName, '\0');
251 return exec_actions(ap->subexpr, fileName, statbuf);
255 * -prune: if -depth is not given, return true and do not descend
256 * current dir; if -depth is given, return false with no effect.
258 * find dir -name 'asm-*' -prune -o -name '*.[chS]' -print
267 return statbuf->st_size == ap->size;
272 static int fileAction(const char *fileName, struct stat *statbuf, void* junk, int depth)
275 #ifdef CONFIG_FEATURE_FIND_XDEV
276 if (S_ISDIR(statbuf->st_mode) && xdev_count) {
277 for (i = 0; i < xdev_count; i++) {
278 if (xdev_dev[i] != statbuf->st_dev)
283 i = exec_actions(actions, fileName, statbuf);
284 /* Had no explicit -print[0] or -exec? then print */
287 /* Cannot return 0: our caller, recursive_action(),
288 * will perror() and skip dirs (if called on dir) */
289 return i == 0 ? TRUE : i;
293 #if ENABLE_FEATURE_FIND_TYPE
294 static int find_type(const char *type)
322 if (mask == 0 || type[1] != '\0')
323 bb_error_msg_and_die(bb_msg_invalid_arg, type, "-type");
329 #if ENABLE_FEATURE_FIND_PERM || ENABLE_FEATURE_FIND_MTIME \
330 || ENABLE_FEATURE_FIND_MMIN
331 static const char* plus_minus_num(const char* str)
333 if (*str == '-' || *str == '+')
341 #define PARM_char_not (PARM_o + ENABLE_FEATURE_FIND_NOT)
342 #define PARM_print (PARM_char_not + 1)
343 #define PARM_print0 (PARM_print + ENABLE_FEATURE_FIND_PRINT0)
344 #define PARM_name (PARM_print0 + 1)
345 #define PARM_type (PARM_name + ENABLE_FEATURE_FIND_TYPE)
346 #define PARM_perm (PARM_type + ENABLE_FEATURE_FIND_PERM)
347 #define PARM_mtime (PARM_perm + ENABLE_FEATURE_FIND_MTIME)
348 #define PARM_mmin (PARM_mtime + ENABLE_FEATURE_FIND_MMIN)
349 #define PARM_newer (PARM_mmin + ENABLE_FEATURE_FIND_NEWER)
350 #define PARM_inum (PARM_newer + ENABLE_FEATURE_FIND_INUM)
351 #define PARM_exec (PARM_inum + ENABLE_FEATURE_FIND_EXEC)
352 #define PARM_user (PARM_exec + ENABLE_FEATURE_FIND_USER)
354 #define PARM_and (PARM_user + 1)
355 #define PARM_or (PARM_and + 1)
356 #define PARM_not (PARM_or + ENABLE_FEATURE_FIND_NOT)
357 #define PARM_char_brace (PARM_not + 1)
358 #define PARM_prune (PARM_char_brace + 1)
359 #define PARM_size (PARM_prune + 1)
361 static action*** parse_params(char **argv)
364 unsigned cur_group = 0;
365 unsigned cur_action = 0;
366 USE_FEATURE_FIND_NOT( bool invert_flag = 0; )
367 const char * const params[] = {
370 #if ENABLE_FEATURE_FIND_NOT
374 #if ENABLE_FEATURE_FIND_PRINT0
378 #if ENABLE_FEATURE_FIND_TYPE
381 #if ENABLE_FEATURE_FIND_PERM
384 #if ENABLE_FEATURE_FIND_MTIME
387 #if ENABLE_FEATURE_FIND_MMIN
390 #if ENABLE_FEATURE_FIND_NEWER
393 #if ENABLE_FEATURE_FIND_INUM
396 #if ENABLE_FEATURE_FIND_EXEC
399 #if ENABLE_FEATURE_FIND_USER
405 # if ENABLE_FEATURE_FIND_NOT
414 action* alloc_action(int sizeof_struct, action_fp f)
417 appp[cur_group] = xrealloc(appp[cur_group], (cur_action+2) * sizeof(*appp));
418 appp[cur_group][cur_action++] = ap = xmalloc(sizeof_struct);
419 appp[cur_group][cur_action] = NULL;
421 USE_FEATURE_FIND_NOT( ap->invert = invert_flag; )
422 USE_FEATURE_FIND_NOT( invert_flag = 0; )
425 #define ALLOC_ACTION(name) (action_##name*)alloc_action(sizeof(action_##name), (action_fp) func_##name)
427 appp = xzalloc(2 * sizeof(appp[0])); /* appp[0],[1] == NULL */
429 /* Actions have side effects and return a true or false value
430 * We implement: -print, -print0, -exec
432 * The rest are tests.
434 * Tests and actions are grouped by operators
435 * ( expr ) Force precedence
436 * ! expr True if expr is false
437 * -not expr Same as ! expr
438 * expr1 [-a[nd]] expr2 And; expr2 is not evaluated if expr1 is false
439 * expr1 -o[r] expr2 Or; expr2 is not evaluated if expr1 is true
440 * expr1 , expr2 List; both expr1 and expr2 are always evaluated
441 * We implement: (), -a, -o
444 const char *arg = argv[0];
445 const char *arg1 = argv[1];
446 int parm = index_in_str_array(params, arg);
447 /* --- Operators --- */
448 if (parm == PARM_a USE_DESKTOP(|| parm == PARM_and))
450 /* no further special handling required */
452 else if (parm == PARM_o USE_DESKTOP(|| parm == PARM_or))
454 /* start new OR group */
456 appp = xrealloc(appp, (cur_group+2) * sizeof(*appp));
457 /*appp[cur_group] = NULL; - already NULL */
458 appp[cur_group+1] = NULL;
461 #if ENABLE_FEATURE_FIND_NOT
462 else if (parm == PARM_char_not USE_DESKTOP(|| parm == PARM_not))
464 /* also handles "find ! ! -name 'foo*'" */
469 /* --- Tests and actions --- */
470 else if (parm == PARM_print)
473 /* GNU find ignores '!' here: "find ! -print" */
474 USE_FEATURE_FIND_NOT( invert_flag = 0; )
475 (void) ALLOC_ACTION(print);
477 #if ENABLE_FEATURE_FIND_PRINT0
478 else if (parm == PARM_print0)
481 USE_FEATURE_FIND_NOT( invert_flag = 0; )
482 (void) ALLOC_ACTION(print0);
485 else if (parm == PARM_name)
489 bb_error_msg_and_die(bb_msg_requires_arg, arg);
490 ap = ALLOC_ACTION(name);
493 #if ENABLE_FEATURE_FIND_TYPE
494 else if (parm == PARM_type)
498 bb_error_msg_and_die(bb_msg_requires_arg, arg);
499 ap = ALLOC_ACTION(type);
500 ap->type_mask = find_type(arg1);
503 #if ENABLE_FEATURE_FIND_PERM
505 * -perm mode File's permission bits are exactly mode (octal or symbolic).
506 * Symbolic modes use mode 0 as a point of departure.
507 * -perm -mode All of the permission bits mode are set for the file.
508 * -perm +mode Any of the permission bits mode are set for the file.
510 else if (parm == PARM_perm)
514 bb_error_msg_and_die(bb_msg_requires_arg, arg);
515 ap = ALLOC_ACTION(perm);
516 ap->perm_char = arg1[0];
517 arg1 = plus_minus_num(arg1);
519 if (!bb_parse_mode(arg1, &ap->perm_mask))
520 bb_error_msg_and_die("invalid mode: %s", arg1);
523 #if ENABLE_FEATURE_FIND_MTIME
524 else if (parm == PARM_mtime)
528 bb_error_msg_and_die(bb_msg_requires_arg, arg);
529 ap = ALLOC_ACTION(mtime);
530 ap->mtime_char = arg1[0];
531 ap->mtime_days = xatoul(plus_minus_num(arg1));
534 #if ENABLE_FEATURE_FIND_MMIN
535 else if (parm == PARM_mmin)
539 bb_error_msg_and_die(bb_msg_requires_arg, arg);
540 ap = ALLOC_ACTION(mmin);
541 ap->mmin_char = arg1[0];
542 ap->mmin_mins = xatoul(plus_minus_num(arg1));
545 #if ENABLE_FEATURE_FIND_NEWER
546 else if (parm == PARM_newer)
549 struct stat stat_newer;
551 bb_error_msg_and_die(bb_msg_requires_arg, arg);
552 xstat(arg1, &stat_newer);
553 ap = ALLOC_ACTION(newer);
554 ap->newer_mtime = stat_newer.st_mtime;
557 #if ENABLE_FEATURE_FIND_INUM
558 else if (parm == PARM_inum)
562 bb_error_msg_and_die(bb_msg_requires_arg, arg);
563 ap = ALLOC_ACTION(inum);
564 ap->inode_num = xatoul(arg1);
567 #if ENABLE_FEATURE_FIND_EXEC
568 else if (parm == PARM_exec)
573 USE_FEATURE_FIND_NOT( invert_flag = 0; )
574 ap = ALLOC_ACTION(exec);
575 ap->exec_argv = ++argv; /* first arg after -exec */
578 if (!*argv) /* did not see ';' util end */
579 bb_error_msg_and_die(bb_msg_requires_arg, arg);
580 if (LONE_CHAR(argv[0], ';'))
585 if (ap->exec_argc == 0)
586 bb_error_msg_and_die(bb_msg_requires_arg, arg);
587 ap->subst_count = xmalloc(ap->exec_argc * sizeof(int));
590 ap->subst_count[i] = count_subst(ap->exec_argv[i]);
593 #if ENABLE_FEATURE_FIND_USER
594 else if (parm == PARM_user)
598 bb_error_msg_and_die(bb_msg_requires_arg, arg);
599 ap = ALLOC_ACTION(user);
600 ap->uid = bb_strtou(arg1, NULL, 10);
602 ap->uid = xuname2uid(arg1);
606 else if (parm == PARM_char_brace)
615 bb_error_msg_and_die("unpaired '('");
616 if (LONE_CHAR(*endarg, '('))
618 else if (LONE_CHAR(*endarg, ')') && !--nested) {
623 ap = ALLOC_ACTION(paren);
624 ap->subexpr = parse_params(argv + 1);
625 *endarg = (char*) ")"; /* restore NULLed parameter */
628 else if (parm == PARM_prune)
630 USE_FEATURE_FIND_NOT( invert_flag = 0; )
631 (void) ALLOC_ACTION(prune);
633 else if (parm == PARM_size)
637 bb_error_msg_and_die(bb_msg_requires_arg, arg);
638 ap = ALLOC_ACTION(size);
639 ap->size = XATOOFF(arg1);
651 int find_main(int argc, char **argv);
652 int find_main(int argc, char **argv)
654 bool dereference = FALSE;
657 int i, firstopt, status = EXIT_SUCCESS;
659 for (firstopt = 1; firstopt < argc; firstopt++) {
660 if (argv[firstopt][0] == '-')
662 if (ENABLE_FEATURE_FIND_NOT && LONE_CHAR(argv[firstopt], '!'))
665 if (LONE_CHAR(argv[firstopt], '('))
670 argv[0] = (char*)".";
675 /* All options always return true. They always take effect
676 * rather than being processed only when their place in the
677 * expression is reached.
678 * We implement: -follow, -xdev
680 /* Process options, and replace then with -a */
681 /* (-a will be ignored by recursive parser later) */
682 argp = &argv[firstopt];
683 while ((arg = argp[0])) {
684 if (strcmp(arg, "-follow") == 0) {
686 argp[0] = (char*)"-a";
688 #if ENABLE_FEATURE_FIND_XDEV
689 else if (strcmp(arg, "-xdev") == 0) {
692 xdev_count = firstopt - 1;
693 xdev_dev = xmalloc(xdev_count * sizeof(dev_t));
694 for (i = 1; i < firstopt; i++) {
695 /* not xstat(): shouldn't bomb out on
696 * "find not_exist exist -xdev" */
697 if (stat(argv[i], &stbuf))
699 xdev_dev[i-1] = stbuf.st_dev;
702 argp[0] = (char*)"-a";
708 actions = parse_params(&argv[firstopt]);
710 for (i = 1; i < firstopt; i++) {
711 if (!recursive_action(argv[i],
712 action_recurse|(1<<dereference), /* flags */
713 fileAction, /* file action */
714 fileAction, /* dir action */
715 NULL, /* user data */
717 status = EXIT_FAILURE;