+/* vi: set sw=4 ts=4: */
/*
* Mini find implementation for busybox
*
- * Copyright (C) 1998 by Erik Andersen <andersee@debian.org>
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * Reworked by David Douthitt <n9ubh@callsign.net> and
+ * Matt Kraai <kraai@alumni.carnegiemellon.edu>.
*
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
+ * Licensed under the GPL version 2, see the file LICENSE in this tarball.
+ */
+
+/* findutils-4.1.20:
*
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * # 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 <stdio.h>
-#include <unistd.h>
-#include <dirent.h>
-#include "internal.h"
+#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 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, 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; int perm_mask;))
+USE_FEATURE_FIND_MTIME( ACTS(mtime, char mtime_char; int mtime_days;))
+USE_FEATURE_FIND_MMIN( ACTS(mmin, char mmin_char; int 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; int *subst_count; int exec_argc;))
+USE_DESKTOP( ACTS(paren, action ***subexpr;))
+USE_DESKTOP( ACTS(prune))
-static char* pattern=NULL;
-static char* directory=NULL;
-static int dereferenceFlag=FALSE;
+static action ***actions;
+static int need_print = 1;
+
+static inline int one_char(const char* str, char c)
+{
+ return (str[0] == c && str[1] == '\0');
+}
-static const char find_usage[] = "find [path...] [expression]\n"
-"default path is the current directory; default expression is -print\n"
-"expression may consist of:\n";
+static int count_subst(const char *str)
+{
+ int count = 0;
+ while ((str = strstr(str, "{}"))) {
+ count++;
+ str++;
+ }
+ return count;
+}
-static int fileAction(const char *fileName, struct stat* statbuf)
+static char* subst(const char *src, int count, const char* filename)
{
- if (pattern==NULL)
- fprintf(stdout, "%s\n", fileName);
- else if (match(fileName, pattern) == TRUE)
- fprintf(stdout, "%s\n", fileName);
- return( TRUE);
+ 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;
}
-static int dirAction(const char *fileName, struct stat* statbuf)
+
+static int exec_actions(action ***appp, const char *fileName, struct stat *statbuf)
{
- DIR *dir;
- struct dirent *entry;
-
- if (pattern==NULL)
- fprintf(stdout, "%s\n", fileName);
- else if (match(fileName, pattern) == TRUE)
- fprintf(stdout, "%s\n", fileName);
+ int cur_group;
+ int cur_action;
+ int rc = TRUE;
+ action **app, *ap;
- dir = opendir( fileName);
- if (!dir) {
- perror("Can't open directory");
- exit(FALSE);
- }
- while ((entry = readdir(dir)) != NULL) {
- char dirName[NAME_MAX];
- sprintf(dirName, "%s/%s", fileName, entry->d_name);
- recursiveAction( dirName, TRUE, dereferenceFlag, FALSE, fileAction, dirAction);
- }
- return( TRUE);
+ cur_group = -1;
+ while ((app = appp[++cur_group])) {
+ cur_action = -1;
+ do {
+ ap = app[++cur_action];
+ } while (ap && (rc = ap->f(fileName, statbuf, ap)));
+ if (!ap) {
+ /* all actions in group were successful */
+ break;
+ }
+ }
+ return rc;
}
-int find_main(int argc, char **argv)
+
+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)
+{
+ 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
+ACTF(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
+ACTF(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
+ACTF(newer)
{
- if (argc <= 1) {
- dirAction( ".", NULL);
- }
-
- /* peel off the "find" */
- argc--;
- argv++;
-
- if (**argv != '-') {
- directory=*argv;
- argc--;
- argv++;
- }
-
- /* Parse any options */
- while (**argv == '-') {
- int stopit=FALSE;
- while (*++(*argv) && stopit==FALSE) switch (**argv) {
- case 'f':
- if (strcmp(*argv, "follow")==0) {
- argc--;
- argv++;
- dereferenceFlag=TRUE;
+ 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 */
+ 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
+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;
+}
+#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(char *type)
+{
+ int mask = 0;
+
+ switch (type[0]) {
+ case 'b':
+ mask = S_IFBLK;
break;
- case 'n':
- if (strcmp(*argv, "name")==0) {
- if (argc-- > 1) {
- pattern=*(++argv);
- stopit=-TRUE;
- } else {
- usage (find_usage);
- }
- }
+ case 'c':
+ mask = S_IFCHR;
break;
- case '-':
- /* Ignore all long options */
+ case 'd':
+ mask = S_IFDIR;
break;
- default:
- usage (find_usage);
- }
- if (argc-- > 1)
- argv++;
- if (**argv != '-')
+ case 'p':
+ mask = S_IFIFO;
break;
- else
- 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
+
+action*** parse_params(char **argv)
+{
+ action*** appp;
+ int cur_group = 0;
+ int cur_action = 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;
+ return ap;
+ }
+#define ALLOC_ACTION(name) (action_##name*)alloc_action(sizeof(action_##name), (action_fp) func_##name)
- dirAction( directory, NULL);
- exit(TRUE);
+ appp = xzalloc(2 * sizeof(*appp)); /* 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
+
+ while (*argv) {
+ char *arg = argv[0];
+ char *arg1 = argv[1];
+ /* --- Operators --- */
+ if (strcmp(arg, "-a") == 0
+ USE_DESKTOP(|| strcmp(arg, "-and") == 0)
+ ) {
+ /* no 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;
+ appp[cur_group+1] = NULL;
+ cur_action = 0;
+ }
+
+ /* --- Tests and actions --- */
+ else if (strcmp(arg, "-print") == 0) {
+ need_print = 0;
+ (void) ALLOC_ACTION(print);
+ }
+#if ENABLE_FEATURE_FIND_PRINT0
+ else if (strcmp(arg, "-print0") == 0) {
+ need_print = 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_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 (!*++argv)
+ 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 (!*++argv)
+ 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 (!*++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;
+ 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 (one_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_DESKTOP
+ else if (one_char(arg, '(')) {
+ action_paren *ap;
+ char **endarg;
+ int nested = 1;
+
+ endarg = argv;
+ while (1) {
+ if (!*++endarg)
+ bb_error_msg_and_die("unpaired '('");
+ if (one_char(*endarg, '('))
+ nested++;
+ else if (one_char(*endarg, ')') && !--nested) {
+ *endarg = NULL;
+ break;
+ }
+ }
+ ap = ALLOC_ACTION(paren);
+ ap->subexpr = parse_params(argv + 1);
+ *endarg = ")"; /* restore NULLed parameter */
+ argv = endarg;
+ }
+ else if (strcmp(arg, "-prune") == 0) {
+ (void) ALLOC_ACTION(prune);
+ }
+#endif
+ else
+ bb_show_usage();
+ argv++;
+ }
+
+ return appp;
+#undef ALLOC_ACTION
+}
+
+
+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_DESKTOP
+ if (one_char(argv[firstopt], '('))
+ break;
+#endif
+ }
+ if (firstopt == 1) {
+ argv[0] = ".";
+ 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] = "-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] = "-a";
+ }
+ argp++;
+ }
+#endif
+
+ 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;
}
projects / oweals / busybox.git / blobdiff