[git commit master] find: -follow should not error out on dandling links
Denys Vlasenko
vda.linux at googlemail.com
Tue Sep 29 09:07:04 UTC 2009
commit: http://git.busybox.net/busybox/commit/?id=8f7a6d294fd0940e531bb8fef197b1b74fe2a842
branch: http://git.busybox.net/busybox/commit/?id=refs/heads/master
function old new delta
recursive_action 425 465 +40
find_main 436 465 +29
test_main 247 253 +6
need_print 1 - -1
doCommands 2523 2521 -2
compare_keys 737 735 -2
xdev_dev 4 - -4
xdev_count 4 - -4
recurse_flags 4 - -4
mkfs_vfat_main 1609 1605 -4
actions 4 - -4
fileAction 588 583 -5
------------------------------------------------------------------------------
(add/remove: 0/5 grow/shrink: 3/4 up/down: 75/-30) Total: 45 bytes
text data bss dec hex filename
822711 450 7684 830845 cad7d busybox_old
822773 445 7668 830886 cada6 busybox_unstripped
Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
findutils/find.c | 79 ++++++++++++++++++++++++++--------------------
include/libbb.h | 2 +
libbb/recursive_action.c | 19 ++++++++---
3 files changed, 61 insertions(+), 39 deletions(-)
diff --git a/findutils/find.c b/findutils/find.c
index bd92e22..6f7be4f 100644
--- a/findutils/find.c
+++ b/findutils/find.c
@@ -62,9 +62,6 @@
/* This is a NOEXEC applet. Be very careful! */
-IF_FEATURE_FIND_XDEV(static dev_t *xdev_dev;)
-IF_FEATURE_FIND_XDEV(static int xdev_count;)
-
typedef int (*action_fp)(const char *fileName, const struct stat *statbuf, void *) FAST_FUNC;
typedef struct {
@@ -100,9 +97,21 @@ IF_FEATURE_FIND_DELETE( ACTS(delete))
IF_FEATURE_FIND_EXEC( ACTS(exec, char **exec_argv; unsigned *subst_count; int exec_argc;))
IF_FEATURE_FIND_GROUP( ACTS(group, gid_t gid;))
-static action ***actions;
-static bool need_print = 1;
-static int recurse_flags = ACTION_RECURSE;
+struct globals {
+ IF_FEATURE_FIND_XDEV(dev_t *xdev_dev;)
+ IF_FEATURE_FIND_XDEV(int xdev_count;)
+ action ***actions;
+ bool need_print;
+ recurse_flags_t recurse_flags;
+};
+#define G (*(struct globals*)&bb_common_bufsiz1)
+#define INIT_G() do { \
+ struct G_sizecheck { \
+ char G_sizecheck[sizeof(G) > COMMON_BUFSIZE ? -1 : 1]; \
+ }; \
+ G.need_print = 1; \
+ G.recurse_flags = ACTION_RECURSE; \
+} while (0)
#if ENABLE_FEATURE_FIND_EXEC
static unsigned count_subst(const char *str)
@@ -367,7 +376,7 @@ ACTF(context)
security_context_t con;
int rc;
- if (recurse_flags & ACTION_FOLLOWLINKS) {
+ if (G.recurse_flags & ACTION_FOLLOWLINKS) {
rc = getfilecon(fileName, &con);
} else {
rc = lgetfilecon(fileName, &con);
@@ -396,9 +405,9 @@ static int FAST_FUNC fileAction(const char *fileName,
#if ENABLE_FEATURE_FIND_XDEV
if (S_ISDIR(statbuf->st_mode)) {
- if (xdev_count) {
- for (i = 0; i < xdev_count; i++) {
- if (xdev_dev[i] == statbuf->st_dev)
+ if (G.xdev_count) {
+ for (i = 0; i < G.xdev_count; i++) {
+ if (G.xdev_dev[i] == statbuf->st_dev)
goto found;
}
return SKIP;
@@ -406,9 +415,9 @@ static int FAST_FUNC fileAction(const char *fileName,
}
}
#endif
- i = exec_actions(actions, fileName, statbuf);
+ i = exec_actions(G.actions, fileName, statbuf);
/* Had no explicit -print[0] or -exec? then print */
- if ((i & TRUE) && need_print)
+ if ((i & TRUE) && G.need_print)
puts(fileName);
#if ENABLE_FEATURE_FIND_MAXDEPTH
@@ -443,7 +452,7 @@ static int find_type(const char *type)
else if (*type == 's')
mask = S_IFSOCK;
- if (mask == 0 || *(type + 1) != '\0')
+ if (mask == 0 || type[1] != '\0')
bb_error_msg_and_die(bb_msg_invalid_arg, type, "-type");
return mask;
@@ -464,15 +473,15 @@ static const char* plus_minus_num(const char* str)
static action*** parse_params(char **argv)
{
enum {
- PARM_a ,
- PARM_o ,
- IF_FEATURE_FIND_NOT( PARM_char_not ,)
+ PARM_a ,
+ PARM_o ,
+ IF_FEATURE_FIND_NOT( PARM_char_not ,)
#if ENABLE_DESKTOP
- PARM_and ,
- PARM_or ,
+ PARM_and ,
+ PARM_or ,
IF_FEATURE_FIND_NOT( PARM_not ,)
#endif
- PARM_print ,
+ PARM_print ,
IF_FEATURE_FIND_PRINT0( PARM_print0 ,)
IF_FEATURE_FIND_DEPTH( PARM_depth ,)
IF_FEATURE_FIND_PRUNE( PARM_prune ,)
@@ -480,8 +489,8 @@ static action*** parse_params(char **argv)
IF_FEATURE_FIND_EXEC( PARM_exec ,)
IF_FEATURE_FIND_PAREN( PARM_char_brace,)
/* All options starting from here require argument */
- PARM_name ,
- PARM_iname ,
+ PARM_name ,
+ PARM_iname ,
IF_FEATURE_FIND_PATH( PARM_path ,)
IF_FEATURE_FIND_REGEX( PARM_regex ,)
IF_FEATURE_FIND_TYPE( PARM_type ,)
@@ -604,21 +613,21 @@ static action*** parse_params(char **argv)
/* --- Tests and actions --- */
else if (parm == PARM_print) {
- need_print = 0;
+ G.need_print = 0;
/* GNU find ignores '!' here: "find ! -print" */
IF_FEATURE_FIND_NOT( invert_flag = 0; )
(void) ALLOC_ACTION(print);
}
#if ENABLE_FEATURE_FIND_PRINT0
else if (parm == PARM_print0) {
- need_print = 0;
+ G.need_print = 0;
IF_FEATURE_FIND_NOT( invert_flag = 0; )
(void) ALLOC_ACTION(print0);
}
#endif
#if ENABLE_FEATURE_FIND_DEPTH
else if (parm == PARM_depth) {
- recurse_flags |= ACTION_DEPTHFIRST;
+ G.recurse_flags |= ACTION_DEPTHFIRST;
}
#endif
#if ENABLE_FEATURE_FIND_PRUNE
@@ -629,8 +638,8 @@ static action*** parse_params(char **argv)
#endif
#if ENABLE_FEATURE_FIND_DELETE
else if (parm == PARM_delete) {
- need_print = 0;
- recurse_flags |= ACTION_DEPTHFIRST;
+ G.need_print = 0;
+ G.recurse_flags |= ACTION_DEPTHFIRST;
(void) ALLOC_ACTION(delete);
}
#endif
@@ -638,7 +647,7 @@ static action*** parse_params(char **argv)
else if (parm == PARM_exec) {
int i;
action_exec *ap;
- need_print = 0;
+ G.need_print = 0;
IF_FEATURE_FIND_NOT( invert_flag = 0; )
ap = ALLOC_ACTION(exec);
ap->exec_argv = ++argv; /* first arg after -exec */
@@ -846,6 +855,8 @@ IF_FEATURE_FIND_MAXDEPTH(OPT_MINDEPTH,)
#define minmaxdepth NULL
#endif
+ INIT_G();
+
for (firstopt = 1; firstopt < argc; firstopt++) {
if (argv[firstopt][0] == '-')
break;
@@ -873,21 +884,21 @@ IF_FEATURE_FIND_MAXDEPTH(OPT_MINDEPTH,)
while ((arg = argp[0])) {
int opt = index_in_strings(options, arg);
if (opt == OPT_FOLLOW) {
- recurse_flags |= ACTION_FOLLOWLINKS;
+ G.recurse_flags |= ACTION_FOLLOWLINKS | ACTION_DANGLING_OK;
argp[0] = (char*)"-a";
}
#if ENABLE_FEATURE_FIND_XDEV
if (opt == OPT_XDEV) {
struct stat stbuf;
- if (!xdev_count) {
- xdev_count = firstopt - 1;
- xdev_dev = xmalloc(xdev_count * sizeof(dev_t));
+ if (!G.xdev_count) {
+ G.xdev_count = firstopt - 1;
+ G.xdev_dev = xmalloc(G.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;
+ G.xdev_dev[i-1] = stbuf.st_dev;
}
}
argp[0] = (char*)"-a";
@@ -906,11 +917,11 @@ IF_FEATURE_FIND_MAXDEPTH(OPT_MINDEPTH,)
argp++;
}
- actions = parse_params(&argv[firstopt]);
+ G.actions = parse_params(&argv[firstopt]);
for (i = 1; i < firstopt; i++) {
if (!recursive_action(argv[i],
- recurse_flags, /* flags */
+ G.recurse_flags,/* flags */
fileAction, /* file action */
fileAction, /* dir action */
#if ENABLE_FEATURE_FIND_MAXDEPTH
diff --git a/include/libbb.h b/include/libbb.h
index 8ecde5b..a02355c 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -286,7 +286,9 @@ enum {
ACTION_DEPTHFIRST = (1 << 3),
/*ACTION_REVERSE = (1 << 4), - unused */
ACTION_QUIET = (1 << 5),
+ ACTION_DANGLING_OK = (1 << 6),
};
+typedef uint8_t recurse_flags_t;
extern int recursive_action(const char *fileName, unsigned flags,
int FAST_FUNC (*fileAction)(const char *fileName, struct stat* statbuf, void* userData, int depth),
int FAST_FUNC (*dirAction)(const char *fileName, struct stat* statbuf, void* userData, int depth),
diff --git a/libbb/recursive_action.c b/libbb/recursive_action.c
index 3ec596a..57262cd 100644
--- a/libbb/recursive_action.c
+++ b/libbb/recursive_action.c
@@ -48,7 +48,7 @@ static int FAST_FUNC true_action(const char *fileName UNUSED_PARAM,
* into that directory, instead recursive_action() returns 0 (if FALSE)
* or 1 (if SKIP)
*
- * followLinks=0/1 differs mainly in handling of links to dirs.
+ * ACTION_FOLLOWLINKS mainly controls handling of links to dirs.
* 0: lstat(statbuf). Calls fileAction on link name even if points to dir.
* 1: stat(statbuf). Calls dirAction and optionally recurse on link to dir.
*/
@@ -61,6 +61,7 @@ int FAST_FUNC recursive_action(const char *fileName,
unsigned depth)
{
struct stat statbuf;
+ unsigned follow;
int status;
DIR *dir;
struct dirent *next;
@@ -68,14 +69,22 @@ int FAST_FUNC recursive_action(const char *fileName,
if (!fileAction) fileAction = true_action;
if (!dirAction) dirAction = true_action;
- status = ACTION_FOLLOWLINKS; /* hijack a variable for bitmask... */
- if (!depth)
- status = ACTION_FOLLOWLINKS | ACTION_FOLLOWLINKS_L0;
- status = ((flags & status) ? stat : lstat)(fileName, &statbuf);
+ follow = ACTION_FOLLOWLINKS;
+ if (depth == 0)
+ follow = ACTION_FOLLOWLINKS | ACTION_FOLLOWLINKS_L0;
+ follow &= flags;
+ status = (follow ? stat : lstat)(fileName, &statbuf);
if (status < 0) {
#ifdef DEBUG_RECURS_ACTION
bb_error_msg("status=%d flags=%x", status, flags);
#endif
+ if ((flags & ACTION_DANGLING_OK)
+ && errno == ENOENT
+ && lstat(fileName, &statbuf) == 0
+ ) {
+ /* Dangling link */
+ return fileAction(fileName, &statbuf, userData, depth);
+ }
goto done_nak_warn;
}
--
1.6.3.3
More information about the busybox-cvs
mailing list