busybox/findutils/find.c

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/* vi: set sw=4 ts=4: */
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/*
* Mini find implementation for busybox
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
* Reworked by David Douthitt <n9ubh@callsign.net> and
* Matt Kraai <kraai@alumni.carnegiemellon.edu>.
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*
* Licensed under the GPL version 2, see the file LICENSE in this tarball.
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*/
/* 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
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* # 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 <fnmatch.h>
#include "busybox.h"
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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;
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#if ENABLE_FEATURE_FIND_NOT
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bool invert;
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#endif
} action;
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#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)
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ACTS(name, const char *pattern;)
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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;))
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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;))
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USE_DESKTOP( ACTS(paren, action ***subexpr;))
USE_DESKTOP( ACTS(size, off_t size;))
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USE_DESKTOP( ACTS(prune))
static action ***actions;
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static bool need_print = 1;
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#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;
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size_t 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;
}
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#endif
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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;
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while (1) {
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ap = app[++cur_action];
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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;
}
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}
}
return rc;
}
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ACTF(name)
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{
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
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ACTF(type)
{
return ((statbuf->st_mode & S_IFMT) == ap->type_mask);
}
#endif
#if ENABLE_FEATURE_FIND_PERM
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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
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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
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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
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ACTF(newer)
{
return (ap->newer_mtime < statbuf->st_mtime);
}
#endif
#if ENABLE_FEATURE_FIND_INUM
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ACTF(inum)
{
return (statbuf->st_ino == ap->inode_num);
}
#endif
#if ENABLE_FEATURE_FIND_EXEC
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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
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#if ENABLE_FEATURE_FIND_USER
ACTF(user)
{
return (statbuf->st_uid == ap->uid);
}
#endif
#if ENABLE_FEATURE_FIND_PRINT0
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ACTF(print0)
{
printf("%s%c", fileName, '\0');
return TRUE;
}
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#endif
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ACTF(print)
{
puts(fileName);
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return TRUE;
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}
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#if ENABLE_DESKTOP
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ACTF(paren)
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{
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
*/
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ACTF(prune)
{
return SKIP;
}
ACTF(size)
{
return statbuf->st_size == ap->size;
}
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#endif
static int fileAction(const char *fileName, struct stat *statbuf, void* junk, int depth)
{
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int i;
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#ifdef CONFIG_FEATURE_FIND_XDEV
if (S_ISDIR(statbuf->st_mode) && xdev_count) {
for (i = 0; i < xdev_count; i++) {
if (xdev_dev[i] != statbuf->st_dev)
return SKIP;
}
}
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#endif
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i = exec_actions(actions, fileName, statbuf);
/* Had no explicit -print[0] or -exec? then print */
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if (i && need_print)
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puts(fileName);
/* Cannot return 0: our caller, recursive_action(),
* will perror() and skip dirs (if called on dir) */
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return i == 0 ? TRUE : i;
}
#if ENABLE_FEATURE_FIND_TYPE
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static int find_type(const char *type)
{
int mask = 0;
if (*type == 'b')
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mask = S_IFBLK;
else if (*type == 'c')
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mask = S_IFCHR;
else if (*type == 'd')
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mask = S_IFDIR;
else if (*type == 'p')
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mask = S_IFIFO;
else if (*type == 'f')
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mask = S_IFREG;
else if (*type == 'l')
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mask = S_IFLNK;
else if (*type == 's')
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mask = S_IFSOCK;
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
#define PARM_a 0
#define PARM_o 1
#define PARM_char_not (PARM_o + ENABLE_FEATURE_FIND_NOT)
#define PARM_print (PARM_char_not + 1)
#define PARM_print0 (PARM_print + ENABLE_FEATURE_FIND_PRINT0)
#define PARM_name (PARM_print0 + 1)
#define PARM_type (PARM_name + ENABLE_FEATURE_FIND_TYPE)
#define PARM_perm (PARM_type + ENABLE_FEATURE_FIND_PERM)
#define PARM_mtime (PARM_perm + ENABLE_FEATURE_FIND_MTIME)
#define PARM_mmin (PARM_mtime + ENABLE_FEATURE_FIND_MMIN)
#define PARM_newer (PARM_mmin + ENABLE_FEATURE_FIND_NEWER)
#define PARM_inum (PARM_newer + ENABLE_FEATURE_FIND_INUM)
#define PARM_exec (PARM_inum + ENABLE_FEATURE_FIND_EXEC)
#define PARM_user (PARM_exec + ENABLE_FEATURE_FIND_USER)
#if ENABLE_DESKTOP
#define PARM_and (PARM_user + 1)
#define PARM_or (PARM_and + 1)
#define PARM_not (PARM_or + ENABLE_FEATURE_FIND_NOT)
#define PARM_char_brace (PARM_not + 1)
#define PARM_prune (PARM_char_brace + 1)
#define PARM_size (PARM_prune + 1)
#endif
static action*** parse_params(char **argv)
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{
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action*** appp;
unsigned cur_group = 0;
unsigned cur_action = 0;
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USE_FEATURE_FIND_NOT( bool invert_flag = 0; )
const char * const params[] = {
"-a",
"-o",
#if ENABLE_FEATURE_FIND_NOT
"!",
#endif
"-print",
#if ENABLE_FEATURE_FIND_PRINT0
"-print0",
#endif
"-name",
#if ENABLE_FEATURE_FIND_TYPE
"-type",
#endif
#if ENABLE_FEATURE_FIND_PERM
"-perm",
#endif
#if ENABLE_FEATURE_FIND_MTIME
"-mtime",
#endif
#if ENABLE_FEATURE_FIND_MMIN
"-mmin",
#endif
#if ENABLE_FEATURE_FIND_NEWER
"-newer",
#endif
#if ENABLE_FEATURE_FIND_INUM
"-inum",
#endif
#if ENABLE_FEATURE_FIND_EXEC
"-exec",
#endif
#if ENABLE_FEATURE_FIND_USER
"-user",
#endif
#if ENABLE_DESKTOP
"-and",
"-or",
# if ENABLE_FEATURE_FIND_NOT
"-not",
# endif
"(",
"-prune",
"-size",
#endif
NULL
};
action* alloc_action(int sizeof_struct, action_fp f)
{
action *ap;
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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;
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USE_FEATURE_FIND_NOT( ap->invert = invert_flag; )
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USE_FEATURE_FIND_NOT( invert_flag = 0; )
return ap;
}
#define ALLOC_ACTION(name) (action_##name*)alloc_action(sizeof(action_##name), (action_fp) func_##name)
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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
*/
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while (*argv) {
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const char *arg = argv[0];
const char *arg1 = argv[1];
int parm = index_in_str_array(params, arg);
/* --- Operators --- */
if (parm == PARM_a USE_DESKTOP(|| parm == PARM_and))
{
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/* no further special handling required */
}
else if (parm == PARM_o USE_DESKTOP(|| parm == PARM_or))
{
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/* start new OR group */
cur_group++;
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appp = xrealloc(appp, (cur_group+2) * sizeof(*appp));
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/*appp[cur_group] = NULL; - already NULL */
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appp[cur_group+1] = NULL;
cur_action = 0;
}
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#if ENABLE_FEATURE_FIND_NOT
else if (parm == PARM_char_not USE_DESKTOP(|| parm == PARM_not))
{
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/* also handles "find ! ! -name 'foo*'" */
invert_flag ^= 1;
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}
#endif
/* --- Tests and actions --- */
else if (parm == PARM_print)
{
need_print = 0;
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/* GNU find ignores '!' here: "find ! -print" */
USE_FEATURE_FIND_NOT( invert_flag = 0; )
(void) ALLOC_ACTION(print);
}
#if ENABLE_FEATURE_FIND_PRINT0
else if (parm == PARM_print0)
{
need_print = 0;
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USE_FEATURE_FIND_NOT( invert_flag = 0; )
(void) ALLOC_ACTION(print0);
}
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#endif
else if (parm == PARM_name)
{
action_name *ap;
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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 (parm == PARM_type)
{
action_type *ap;
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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 (parm == PARM_perm)
{
action_perm *ap;
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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 (parm == PARM_mtime)
{
action_mtime *ap;
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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 (parm == PARM_mmin)
{
action_mmin *ap;
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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 (parm == PARM_newer)
{
action_newer *ap;
struct stat stat_newer;
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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 (parm == PARM_inum)
{
action_inum *ap;
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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 (parm == PARM_exec)
{
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int i;
action_exec *ap;
need_print = 0;
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USE_FEATURE_FIND_NOT( invert_flag = 0; )
ap = ALLOC_ACTION(exec);
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ap->exec_argv = ++argv; /* first arg after -exec */
ap->exec_argc = 0;
while (1) {
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if (!*argv) /* did not see ';' util end */
bb_error_msg_and_die(bb_msg_requires_arg, arg);
if (LONE_CHAR(argv[0], ';'))
break;
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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));
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i = ap->exec_argc;
while (i--)
ap->subst_count[i] = count_subst(ap->exec_argv[i]);
}
#endif
#if ENABLE_FEATURE_FIND_USER
else if (parm == PARM_user)
{
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
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#if ENABLE_DESKTOP
else if (parm == PARM_char_brace)
{
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action_paren *ap;
char **endarg;
unsigned nested = 1;
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endarg = argv;
while (1) {
if (!*++endarg)
bb_error_msg_and_die("unpaired '('");
if (LONE_CHAR(*endarg, '('))
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nested++;
else if (LONE_CHAR(*endarg, ')') && !--nested) {
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*endarg = NULL;
break;
}
}
ap = ALLOC_ACTION(paren);
ap->subexpr = parse_params(argv + 1);
*endarg = (char*) ")"; /* restore NULLed parameter */
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argv = endarg;
}
else if (parm == PARM_prune)
{
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USE_FEATURE_FIND_NOT( invert_flag = 0; )
(void) ALLOC_ACTION(prune);
}
else if (parm == PARM_size)
{
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
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bb_show_usage();
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argv++;
}
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return appp;
#undef ALLOC_ACTION
}
int find_main(int argc, char **argv);
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int find_main(int argc, char **argv)
{
bool dereference = FALSE;
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char *arg;
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char **argp;
int i, firstopt, status = EXIT_SUCCESS;
const char * const options[] = {
"-follow",
USE_FEATURE_FIND_XDEV( "-xdev", )
NULL
};
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for (firstopt = 1; firstopt < argc; firstopt++) {
if (argv[firstopt][0] == '-')
break;
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if (ENABLE_FEATURE_FIND_NOT && LONE_CHAR(argv[firstopt], '!'))
break;
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#if ENABLE_DESKTOP
if (LONE_CHAR(argv[firstopt], '('))
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break;
#endif
}
if (firstopt == 1) {
argv[0] = (char*)".";
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argv--;
firstopt++;
}
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/* 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
*/
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/* Process options, and replace then with -a */
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/* (-a will be ignored by recursive parser later) */
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argp = &argv[firstopt];
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while ((arg = argp[0])) {
i = index_in_str_array(options, arg);
if (i == 0) { /* -follow */
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dereference = TRUE;
argp[0] = (char*)"-a";
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}
#if ENABLE_FEATURE_FIND_XDEV
else if (i == 1) { /* -xdev */
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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;
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xdev_dev[i-1] = stbuf.st_dev;
}
}
argp[0] = (char*)"-a";
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}
#endif
argp++;
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}
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actions = parse_params(&argv[firstopt]);
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for (i = 1; i < firstopt; i++) {
if (!recursive_action(argv[i],
action_recurse|(1<<dereference), /* flags */
fileAction, /* file action */
fileAction, /* dir action */
NULL, /* user data */
0)) /* depth */
status = EXIT_FAILURE;
}
return status;
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}