*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
#include "libbb.h"
#undef DEBUG_RECURS_ACTION
-
/*
* Walk down all the directories under the specified
* location, and do something (something specified
* is so stinking huge.
*/
-static int true_action(const char *fileName, struct stat *statbuf, void* userData)
+static int FAST_FUNC true_action(const char *fileName UNUSED_PARAM,
+ struct stat *statbuf UNUSED_PARAM,
+ void* userData UNUSED_PARAM,
+ int depth UNUSED_PARAM)
{
return TRUE;
}
-int recursive_action(const char *fileName,
- int recurse, int followLinks, int depthFirst,
- int (*fileAction) (const char *fileName, struct stat * statbuf, void* userData),
- int (*dirAction) (const char *fileName, struct stat * statbuf, void* userData),
- void* userData)
+/* fileName is (l)stat'ed (depending on ACTION_FOLLOWLINKS[_L0]).
+ *
+ * If it is a file: fileAction in run on it, its return value is returned.
+ *
+ * In case we are in a recursive invocation (see below):
+ * normally, fileAction should return 1 (TRUE) to indicate that
+ * everything is okay and processing should continue.
+ * fileAction return value of 0 (FALSE) on any file in directory will make
+ * recursive_action() also return 0, but it doesn't stop directory traversal
+ * (fileAction/dirAction will be called on each file).
+ *
+ * [TODO: maybe introduce -1 to mean "stop traversal NOW and return"]
+ *
+ * If it is a directory:
+ *
+ * If !ACTION_RECURSE, dirAction is called and its
+ * return value is returned from recursive_action(). No recursion.
+ *
+ * If ACTION_RECURSE, directory is opened, and recursive_action() is called
+ * on each file/subdirectory.
+ * If any one of these calls returns 0, current recursive_action() returns 0.
+ *
+ * If !ACTION_DEPTHFIRST, dirAction is called before recurse.
+ * Return value of 0 (FALSE) is an error: prevents recursion,
+ * the warning is printed (unless ACTION_QUIET) and recursive_action() returns 0.
+ * Return value of 2 (SKIP) prevents recursion, instead recursive_action()
+ * returns 1 (TRUE, no error).
+ *
+ * If ACTION_DEPTHFIRST, dirAction is called after recurse.
+ * If it returns 0, the warning is printed and recursive_action() returns 0.
+ *
+ * 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.
+ */
+
+int FAST_FUNC 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),
+ void* userData,
+ unsigned depth)
{
struct stat statbuf;
+ unsigned follow;
int status;
DIR *dir;
struct dirent *next;
if (!fileAction) fileAction = true_action;
if (!dirAction) dirAction = true_action;
- status = (followLinks ? 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 followLinks=%d TRUE=%d",
- status, followLinks, TRUE);
+ bb_error_msg("status=%d flags=%x", status, flags);
#endif
- bb_perror_msg("%s", fileName);
- return FALSE;
+ if ((flags & ACTION_DANGLING_OK)
+ && errno == ENOENT
+ && lstat(fileName, &statbuf) == 0
+ ) {
+ /* Dangling link */
+ return fileAction(fileName, &statbuf, userData, depth);
+ }
+ goto done_nak_warn;
}
- if (!followLinks && (S_ISLNK(statbuf.st_mode))) {
- return fileAction(fileName, &statbuf, userData);
+ /* If S_ISLNK(m), then we know that !S_ISDIR(m).
+ * Then we can skip checking first part: if it is true, then
+ * (!dir) is also true! */
+ if ( /* (!(flags & ACTION_FOLLOWLINKS) && S_ISLNK(statbuf.st_mode)) || */
+ !S_ISDIR(statbuf.st_mode)
+ ) {
+ return fileAction(fileName, &statbuf, userData, depth);
}
- if (!recurse) {
- if (S_ISDIR(statbuf.st_mode)) {
- return dirAction(fileName, &statbuf, userData);
- }
- }
+ /* It's a directory (or a link to one, and followLinks is set) */
- if (!S_ISDIR(statbuf.st_mode))
- return fileAction(fileName, &statbuf, userData);
+ if (!(flags & ACTION_RECURSE)) {
+ return dirAction(fileName, &statbuf, userData, depth);
+ }
- if (!depthFirst) {
- status = dirAction(fileName, &statbuf, userData);
- if (!status) {
- bb_perror_msg("%s", fileName);
- return FALSE;
- }
+ if (!(flags & ACTION_DEPTHFIRST)) {
+ status = dirAction(fileName, &statbuf, userData, depth);
+ if (status == FALSE)
+ goto done_nak_warn;
if (status == SKIP)
return TRUE;
}
dir = opendir(fileName);
if (!dir) {
- return FALSE;
+ /* findutils-4.1.20 reports this */
+ /* (i.e. it doesn't silently return with exit code 1) */
+ /* To trigger: "find -exec rm -rf {} \;" */
+ goto done_nak_warn;
}
status = TRUE;
while ((next = readdir(dir)) != NULL) {
char *nextFile;
+ int s;
nextFile = concat_subpath_file(fileName, next->d_name);
if (nextFile == NULL)
continue;
- if (!recursive_action(nextFile, TRUE, followLinks, depthFirst,
- fileAction, dirAction, userData)) {
+
+ /* process every file (NB: ACTION_RECURSE is set in flags) */
+ s = recursive_action(nextFile, flags, fileAction, dirAction,
+ userData, depth + 1);
+ if (s == FALSE)
status = FALSE;
- }
free(nextFile);
+//#define RECURSE_RESULT_ABORT -1
+// if (s == RECURSE_RESULT_ABORT) {
+// closedir(dir);
+// return s;
+// }
}
closedir(dir);
- if (depthFirst) {
- if (!dirAction(fileName, &statbuf, userData)) {
- bb_perror_msg("%s", fileName);
- return FALSE;
- }
+
+ if (flags & ACTION_DEPTHFIRST) {
+ if (!dirAction(fileName, &statbuf, userData, depth))
+ goto done_nak_warn;
}
- if (!status)
- return FALSE;
- return TRUE;
+ return status;
+
+ done_nak_warn:
+ if (!(flags & ACTION_QUIET))
+ bb_simple_perror_msg(fileName);
+ return FALSE;
}
projects / oweals / busybox.git / blobdiff