1 /* vi: set sw=4 ts=4: */
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
12 #undef DEBUG_RECURS_ACTION
15 * Walk down all the directories under the specified
16 * location, and do something (something specified
17 * by the fileAction and dirAction function pointers).
19 * Unfortunately, while nftw(3) could replace this and reduce
20 * code size a bit, nftw() wasn't supported before GNU libc 2.1,
21 * and so isn't sufficiently portable to take over since glibc2.1
22 * is so stinking huge.
25 static int FAST_FUNC true_action(const char *fileName UNUSED_PARAM,
26 struct stat *statbuf UNUSED_PARAM,
27 void* userData UNUSED_PARAM,
28 int depth UNUSED_PARAM)
33 /* fileName is (l)stat'ed (depending on ACTION_FOLLOWLINKS[_L0]).
35 * If it is a file: fileAction in run on it, its return value is returned.
37 * In case we are in a recursive invocation (see below):
38 * normally, fileAction should return 1 (TRUE) to indicate that
39 * everything is okay and processing should continue.
40 * fileAction return value of 0 (FALSE) on any file in directory will make
41 * recursive_action() also return 0, but it doesn't stop directory traversal
42 * (fileAction/dirAction will be called on each file).
44 * [TODO: maybe introduce -1 to mean "stop traversal NOW and return"]
46 * If it is a directory:
48 * If !ACTION_RECURSE, dirAction is called and its
49 * return value is returned from recursive_action(). No recursion.
51 * If ACTION_RECURSE, directory is opened, and recursive_action() is called
52 * on each file/subdirectory.
53 * If any one of these calls returns 0, current recursive_action() returns 0.
55 * If !ACTION_DEPTHFIRST, dirAction is called before recurse.
56 * Return value of 0 (FALSE) is an error: prevents recursion,
57 * the warning is printed (unless ACTION_QUIET) and recursive_action() returns 0.
58 * Return value of 2 (SKIP) prevents recursion, instead recursive_action()
59 * returns 1 (TRUE, no error).
61 * If ACTION_DEPTHFIRST, dirAction is called after recurse.
62 * If it returns 0, the warning is printed and recursive_action() returns 0.
64 * ACTION_FOLLOWLINKS mainly controls handling of links to dirs.
65 * 0: lstat(statbuf). Calls fileAction on link name even if points to dir.
66 * 1: stat(statbuf). Calls dirAction and optionally recurse on link to dir.
69 int FAST_FUNC recursive_action(const char *fileName,
71 int FAST_FUNC (*fileAction)(const char *fileName, struct stat *statbuf, void* userData, int depth),
72 int FAST_FUNC (*dirAction)(const char *fileName, struct stat *statbuf, void* userData, int depth),
82 if (!fileAction) fileAction = true_action;
83 if (!dirAction) dirAction = true_action;
85 follow = ACTION_FOLLOWLINKS;
87 follow = ACTION_FOLLOWLINKS | ACTION_FOLLOWLINKS_L0;
89 status = (follow ? stat : lstat)(fileName, &statbuf);
91 #ifdef DEBUG_RECURS_ACTION
92 bb_error_msg("status=%d flags=%x", status, flags);
94 if ((flags & ACTION_DANGLING_OK)
96 && lstat(fileName, &statbuf) == 0
99 return fileAction(fileName, &statbuf, userData, depth);
104 /* If S_ISLNK(m), then we know that !S_ISDIR(m).
105 * Then we can skip checking first part: if it is true, then
106 * (!dir) is also true! */
107 if ( /* (!(flags & ACTION_FOLLOWLINKS) && S_ISLNK(statbuf.st_mode)) || */
108 !S_ISDIR(statbuf.st_mode)
110 return fileAction(fileName, &statbuf, userData, depth);
113 /* It's a directory (or a link to one, and followLinks is set) */
115 if (!(flags & ACTION_RECURSE)) {
116 return dirAction(fileName, &statbuf, userData, depth);
119 if (!(flags & ACTION_DEPTHFIRST)) {
120 status = dirAction(fileName, &statbuf, userData, depth);
127 dir = opendir(fileName);
129 /* findutils-4.1.20 reports this */
130 /* (i.e. it doesn't silently return with exit code 1) */
131 /* To trigger: "find -exec rm -rf {} \;" */
135 while ((next = readdir(dir)) != NULL) {
139 nextFile = concat_subpath_file(fileName, next->d_name);
140 if (nextFile == NULL)
143 /* process every file (NB: ACTION_RECURSE is set in flags) */
144 s = recursive_action(nextFile, flags, fileAction, dirAction,
145 userData, depth + 1);
149 //#define RECURSE_RESULT_ABORT -1
150 // if (s == RECURSE_RESULT_ABORT) {
157 if (flags & ACTION_DEPTHFIRST) {
158 if (!dirAction(fileName, &statbuf, userData, depth))
165 if (!(flags & ACTION_QUIET))
166 bb_simple_perror_msg(fileName);