/* vi: set sw=4 ts=4: */ /* * Mini find implementation for busybox * * Copyright (C) 1999-2004 by Erik Andersen * * Reworked by David Douthitt and * Matt Kraai . * * 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 * * # find t z -name '*t*' -print -o -name '*z*' * t * # find t z t z -name '*t*' -o -name '*z*' -print * z * z * # find t z t z '(' -name '*t*' -o -name '*z*' ')' -o -print * (no output) */ #include #include "busybox.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; #if ENABLE_FEATURE_FIND_NOT smallint invert; #endif } action; #define ACTS(name, arg...) typedef struct { action a; arg; } action_##name; #define ACTF(name) static int func_##name(const char *fileName, struct stat *statbuf, action_##name* ap) ACTS(print) ACTS(name, const char *pattern;) USE_FEATURE_FIND_PRINT0(ACTS(print0)) USE_FEATURE_FIND_TYPE( ACTS(type, int type_mask;)) USE_FEATURE_FIND_PERM( ACTS(perm, char perm_char; mode_t perm_mask;)) USE_FEATURE_FIND_MTIME( ACTS(mtime, char mtime_char; unsigned mtime_days;)) USE_FEATURE_FIND_MMIN( ACTS(mmin, char mmin_char; unsigned mmin_mins;)) USE_FEATURE_FIND_NEWER( ACTS(newer, time_t newer_mtime;)) USE_FEATURE_FIND_INUM( ACTS(inum, ino_t inode_num;)) USE_FEATURE_FIND_EXEC( ACTS(exec, char **exec_argv; unsigned int *subst_count; int exec_argc;)) USE_FEATURE_FIND_USER( ACTS(user, int uid;)) USE_DESKTOP( ACTS(paren, action ***subexpr;)) USE_DESKTOP( ACTS(size, off_t size;)) USE_DESKTOP( ACTS(prune)) static action ***actions; static smalluint need_print = 1; #if ENABLE_FEATURE_FIND_EXEC static unsigned int count_subst(const char *str) { unsigned int count = 0; while ((str = strstr(str, "{}"))) { count++; str++; } return count; } static char* subst(const char *src, unsigned 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; } #endif static int exec_actions(action ***appp, const char *fileName, struct stat *statbuf) { int cur_group; int cur_action; int rc = TRUE; action **app, *ap; cur_group = -1; while ((app = appp[++cur_group])) { cur_action = -1; while (1) { ap = app[++cur_action]; if (!ap) { /* all actions in group were successful */ return rc; } rc = ap->f(fileName, statbuf, ap); #if ENABLE_FEATURE_FIND_NOT if (ap->invert) rc = !rc; #endif if (!rc) { /* current group failed, try next */ break; } } } return rc; } ACTF(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 ACTF(type) { return ((statbuf->st_mode & S_IFMT) == ap->type_mask); } #endif #if ENABLE_FEATURE_FIND_PERM ACTF(perm) { /* -perm +mode: at least one of perm_mask bits are set */ if (ap->perm_char == '+') return (statbuf->st_mode & ap->perm_mask) != 0; /* -perm -mode: all of perm_mask are set */ if (ap->perm_char == '-') return (statbuf->st_mode & ap->perm_mask) == ap->perm_mask; /* -perm mode: file mode must match perm_mask */ return (statbuf->st_mode & 07777) == ap->perm_mask; } #endif #if ENABLE_FEATURE_FIND_MTIME ACTF(mtime) { time_t file_age = time(NULL) - statbuf->st_mtime; time_t mtime_secs = ap->mtime_days * 24*60*60; if (ap->mtime_char == '+') return file_age >= mtime_secs + 24*60*60; if (ap->mtime_char == '-') return file_age < mtime_secs; /* just numeric mtime */ return file_age >= mtime_secs && file_age < (mtime_secs + 24*60*60); } #endif #if ENABLE_FEATURE_FIND_MMIN ACTF(mmin) { time_t file_age = time(NULL) - statbuf->st_mtime; time_t mmin_secs = ap->mmin_mins * 60; if (ap->mmin_char == '+') return file_age >= mmin_secs + 60; if (ap->mmin_char == '-') return file_age < mmin_secs; /* just numeric mmin */ return file_age >= mmin_secs && file_age < (mmin_secs + 60); } #endif #if ENABLE_FEATURE_FIND_NEWER ACTF(newer) { return (ap->newer_mtime < statbuf->st_mtime); } #endif #if ENABLE_FEATURE_FIND_INUM ACTF(inum) { return (statbuf->st_ino == ap->inode_num); } #endif #if ENABLE_FEATURE_FIND_EXEC ACTF(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 */ rc = wait4pid(spawn(argv)); if (rc) 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_USER ACTF(user) { return (statbuf->st_uid == ap->uid); } #endif #if ENABLE_FEATURE_FIND_PRINT0 ACTF(print0) { printf("%s%c", fileName, '\0'); return TRUE; } #endif ACTF(print) { puts(fileName); return TRUE; } #if ENABLE_DESKTOP ACTF(paren) { return exec_actions(ap->subexpr, fileName, statbuf); } /* * -prune: if -depth is not given, return true and do not descend * current dir; if -depth is given, return false with no effect. * Example: * find dir -name 'asm-*' -prune -o -name '*.[chS]' -print */ ACTF(prune) { return SKIP; } ACTF(size) { return statbuf->st_size == ap->size; } #endif static int fileAction(const char *fileName, struct stat *statbuf, void* junk, int depth) { int rc; #ifdef CONFIG_FEATURE_FIND_XDEV if (S_ISDIR(statbuf->st_mode) && xdev_count) { int i; for (i = 0; i < xdev_count; i++) { if (xdev_dev[i] != statbuf->st_dev) return SKIP; } } #endif rc = exec_actions(actions, fileName, statbuf); /* Had no explicit -print[0] or -exec? then print */ if (rc && need_print) puts(fileName); /* Cannot return 0: our caller, recursive_action(), * will perror() and skip dirs (if called on dir) */ return rc == 0 ? TRUE : rc; } #if ENABLE_FEATURE_FIND_TYPE static int find_type(const 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 #if ENABLE_FEATURE_FIND_PERM || ENABLE_FEATURE_FIND_MTIME \ || ENABLE_FEATURE_FIND_MMIN static const char* plus_minus_num(const char* str) { if (*str == '-' || *str == '+') str++; return str; } #endif static action*** parse_params(char **argv) { action*** appp; unsigned cur_group = 0; unsigned cur_action = 0; USE_FEATURE_FIND_NOT( smallint invert_flag = 0; ) action* alloc_action(int sizeof_struct, action_fp f) { action *ap; appp[cur_group] = xrealloc(appp[cur_group], (cur_action+2) * sizeof(*appp)); appp[cur_group][cur_action++] = ap = xmalloc(sizeof_struct); appp[cur_group][cur_action] = NULL; ap->f = f; USE_FEATURE_FIND_NOT( ap->invert = invert_flag; ) USE_FEATURE_FIND_NOT( invert_flag = 0; ) return ap; } #define ALLOC_ACTION(name) (action_##name*)alloc_action(sizeof(action_##name), (action_fp) func_##name) appp = xzalloc(2 * sizeof(appp[0])); /* appp[0],[1] == NULL */ // 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 //XXX: TODO: Use index_in_str_array here while (*argv) { const char *arg = argv[0]; const char *arg1 = argv[1]; /* --- Operators --- */ if (strcmp(arg, "-a") == 0 USE_DESKTOP(|| strcmp(arg, "-and") == 0) ) { /* no further special handling required */ } else if (strcmp(arg, "-o") == 0 USE_DESKTOP(|| strcmp(arg, "-or") == 0) ) { /* start new OR group */ cur_group++; appp = xrealloc(appp, (cur_group+2) * sizeof(*appp)); /*appp[cur_group] = NULL; - already NULL */ appp[cur_group+1] = NULL; cur_action = 0; } #if ENABLE_FEATURE_FIND_NOT else if (LONE_CHAR(arg, '!') USE_DESKTOP(|| strcmp(arg, "-not") == 0) ) { /* also handles "find ! ! -name 'foo*'" */ invert_flag ^= 1; } #endif /* --- Tests and actions --- */ else if (strcmp(arg, "-print") == 0) { need_print = 0; /* GNU find ignores '!' here: "find ! -print" */ USE_FEATURE_FIND_NOT( invert_flag = 0; ) (void) ALLOC_ACTION(print); } #if ENABLE_FEATURE_FIND_PRINT0 else if (strcmp(arg, "-print0") == 0) { need_print = 0; USE_FEATURE_FIND_NOT( invert_flag = 0; ) (void) ALLOC_ACTION(print0); } #endif else if (strcmp(arg, "-name") == 0) { action_name *ap; if (!*++argv) 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 (!*++argv) 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 (!*++argv) bb_error_msg_and_die(bb_msg_requires_arg, arg); ap = ALLOC_ACTION(perm); ap->perm_char = arg1[0]; arg1 = plus_minus_num(arg1); ap->perm_mask = 0; if (!bb_parse_mode(arg1, &ap->perm_mask)) bb_error_msg_and_die("invalid mode: %s", arg1); } #endif #if ENABLE_FEATURE_FIND_MTIME else if (strcmp(arg, "-mtime") == 0) { action_mtime *ap; if (!*++argv) bb_error_msg_and_die(bb_msg_requires_arg, arg); ap = ALLOC_ACTION(mtime); ap->mtime_char = arg1[0]; ap->mtime_days = xatoul(plus_minus_num(arg1)); } #endif #if ENABLE_FEATURE_FIND_MMIN else if (strcmp(arg, "-mmin") == 0) { action_mmin *ap; if (!*++argv) bb_error_msg_and_die(bb_msg_requires_arg, arg); ap = ALLOC_ACTION(mmin); ap->mmin_char = arg1[0]; ap->mmin_mins = xatoul(plus_minus_num(arg1)); } #endif #if ENABLE_FEATURE_FIND_NEWER else if (strcmp(arg, "-newer") == 0) { action_newer *ap; struct stat stat_newer; if (!*++argv) 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 (!*++argv) 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) { int i; action_exec *ap; need_print = 0; USE_FEATURE_FIND_NOT( invert_flag = 0; ) ap = ALLOC_ACTION(exec); ap->exec_argv = ++argv; /* first arg after -exec */ ap->exec_argc = 0; while (1) { if (!*argv) /* did not see ';' till end */ bb_error_msg_and_die(bb_msg_requires_arg, arg); if (LONE_CHAR(argv[0], ';')) break; argv++; ap->exec_argc++; } if (ap->exec_argc == 0) bb_error_msg_and_die(bb_msg_requires_arg, arg); ap->subst_count = xmalloc(ap->exec_argc * sizeof(int)); i = ap->exec_argc; while (i--) ap->subst_count[i] = count_subst(ap->exec_argv[i]); } #endif #if ENABLE_FEATURE_FIND_USER else if (strcmp(arg, "-user") == 0) { action_user *ap; if (!*++argv) bb_error_msg_and_die(bb_msg_requires_arg, arg); ap = ALLOC_ACTION(user); ap->uid = bb_strtou(arg1, NULL, 10); if (errno) ap->uid = xuname2uid(arg1); } #endif #if ENABLE_DESKTOP else if (LONE_CHAR(arg, '(')) { action_paren *ap; char **endarg; unsigned nested = 1; endarg = argv; while (1) { if (!*++endarg) bb_error_msg_and_die("unpaired '('"); if (LONE_CHAR(*endarg, '(')) nested++; else if (LONE_CHAR(*endarg, ')') && !--nested) { *endarg = NULL; break; } } ap = ALLOC_ACTION(paren); ap->subexpr = parse_params(argv + 1); *endarg = (char*) ")"; /* restore NULLed parameter */ argv = endarg; } else if (strcmp(arg, "-prune") == 0) { USE_FEATURE_FIND_NOT( invert_flag = 0; ) (void) ALLOC_ACTION(prune); } else if (strcmp(arg, "-size") == 0) { action_size *ap; if (!*++argv) bb_error_msg_and_die(bb_msg_requires_arg, arg); ap = ALLOC_ACTION(size); ap->size = XATOOFF(arg1); } #endif else bb_show_usage(); argv++; } return appp; #undef ALLOC_ACTION } int find_main(int argc, char **argv); int find_main(int argc, char **argv) { int dereference = FALSE; char *arg; char **argp; int i, firstopt, status = EXIT_SUCCESS; for (firstopt = 1; firstopt < argc; firstopt++) { if (argv[firstopt][0] == '-') break; if (ENABLE_FEATURE_FIND_NOT && LONE_CHAR(argv[firstopt], '!')) break; #if ENABLE_DESKTOP if (LONE_CHAR(argv[firstopt], '(')) break; #endif } if (firstopt == 1) { argv[0] = (char*)"."; argv--; 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 /* Process options, and replace then with -a */ /* (-a will be ignored by recursive parser later) */ argp = &argv[firstopt]; while ((arg = argp[0])) { if (strcmp(arg, "-follow") == 0) { dereference = TRUE; argp[0] = (char*)"-a"; } #if ENABLE_FEATURE_FIND_XDEV else if (strcmp(arg, "-xdev") == 0) { struct stat stbuf; if (!xdev_count) { xdev_count = firstopt - 1; xdev_dev = xmalloc(xdev_count * sizeof(dev_t)); for (i = 1; i < firstopt; i++) { /* not xstat(): shouldn't bomb out on * "find not_exist exist -xdev" */ if (stat(argv[i], &stbuf)) stbuf.st_dev = -1L; xdev_dev[i-1] = stbuf.st_dev; } } argp[0] = (char*)"-a"; } #endif argp++; } actions = parse_params(&argv[firstopt]); 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; }