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 tarball for details.
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 true_action(const char *fileName, struct stat *statbuf,
26 void* userData, int depth)
31 /* fileAction return value of 0 on any file in directory will make
32 * recursive_action() return 0, but it doesn't stop directory traversal
33 * (fileAction/dirAction will be called on each file).
35 * if !depthFirst, dirAction return value of 0 (FALSE) or 2 (SKIP)
36 * prevents recursion into that directory, instead
37 * recursive_action() returns 0 (if FALSE) or 1 (if SKIP).
39 * followLinks=0/1 differs mainly in handling of links to dirs.
40 * 0: lstat(statbuf). Calls fileAction on link name even if points to dir.
41 * 1: stat(statbuf). Calls dirAction and optionally recurse on link to dir.
44 int recursive_action(const char *fileName,
46 int (*fileAction)(const char *fileName, struct stat *statbuf, void* userData, int depth),
47 int (*dirAction)(const char *fileName, struct stat *statbuf, void* userData, int depth),
56 if (!fileAction) fileAction = true_action;
57 if (!dirAction) dirAction = true_action;
59 status = ACTION_FOLLOWLINKS; /* hijack a variable for bitmask... */
60 if (!depth) status = ACTION_FOLLOWLINKS | ACTION_FOLLOWLINKS_L0;
61 status = ((flags & status) ? stat : lstat)(fileName, &statbuf);
63 #ifdef DEBUG_RECURS_ACTION
64 bb_error_msg("status=%d flags=%x", status, flags);
69 /* If S_ISLNK(m), then we know that !S_ISDIR(m).
70 * Then we can skip checking first part: if it is true, then
71 * (!dir) is also true! */
72 if ( /* (!(flags & ACTION_FOLLOWLINKS) && S_ISLNK(statbuf.st_mode)) || */
73 !S_ISDIR(statbuf.st_mode)
75 return fileAction(fileName, &statbuf, userData, depth);
78 /* It's a directory (or a link to one, and followLinks is set) */
80 if (!(flags & ACTION_RECURSE)) {
81 return dirAction(fileName, &statbuf, userData, depth);
84 if (!(flags & ACTION_DEPTHFIRST)) {
85 status = dirAction(fileName, &statbuf, userData, depth);
92 dir = opendir(fileName);
94 /* findutils-4.1.20 reports this */
95 /* (i.e. it doesn't silently return with exit code 1) */
96 /* To trigger: "find -exec rm -rf {} \;" */
100 while ((next = readdir(dir)) != NULL) {
103 nextFile = concat_subpath_file(fileName, next->d_name);
104 if (nextFile == NULL)
106 /* now descend into it (NB: ACTION_RECURSE is set in flags) */
107 if (!recursive_action(nextFile, flags, fileAction, dirAction, userData, depth+1))
113 if (flags & ACTION_DEPTHFIRST) {
114 if (!dirAction(fileName, &statbuf, userData, depth))
123 bb_perror_msg("%s", fileName);