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126 lines
3.5 KiB
C
126 lines
3.5 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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#undef DEBUG_RECURS_ACTION
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/*
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* Walk down all the directories under the specified
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* location, and do something (something specified
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* by the fileAction and dirAction function pointers).
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*
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* Unfortunately, while nftw(3) could replace this and reduce
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* code size a bit, nftw() wasn't supported before GNU libc 2.1,
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* and so isn't sufficiently portable to take over since glibc2.1
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* is so stinking huge.
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*/
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static int true_action(const char *fileName, struct stat *statbuf,
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void* userData, int depth)
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{
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return TRUE;
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}
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/* fileAction return value of 0 on any file in directory will make
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* recursive_action() return 0, but it doesn't stop directory traversal
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* (fileAction/dirAction will be called on each file).
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*
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* if !depthFirst, dirAction return value of 0 (FALSE) or 2 (SKIP)
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* prevents recursion into that directory, instead
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* recursive_action() returns 0 (if FALSE) or 1 (if SKIP).
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*
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* followLinks=0/1 differs mainly in handling of links to dirs.
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* 0: lstat(statbuf). Calls fileAction on link name even if points to dir.
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* 1: stat(statbuf). Calls dirAction and optionally recurse on link to dir.
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*/
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int recursive_action(const char *fileName,
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unsigned flags,
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int (*fileAction)(const char *fileName, struct stat *statbuf, void* userData, int depth),
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int (*dirAction)(const char *fileName, struct stat *statbuf, void* userData, int depth),
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void* userData,
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unsigned depth)
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{
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struct stat statbuf;
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int status;
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DIR *dir;
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struct dirent *next;
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if (!fileAction) fileAction = true_action;
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if (!dirAction) dirAction = true_action;
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status = ACTION_FOLLOWLINKS; /* hijack a variable for bitmask... */
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if (!depth) status = ACTION_FOLLOWLINKS | ACTION_FOLLOWLINKS_L0;
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status = ((flags & status) ? stat : lstat)(fileName, &statbuf);
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if (status < 0) {
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#ifdef DEBUG_RECURS_ACTION
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bb_error_msg("status=%d flags=%x", status, flags);
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#endif
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goto done_nak_warn;
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}
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/* If S_ISLNK(m), then we know that !S_ISDIR(m).
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* Then we can skip checking first part: if it is true, then
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* (!dir) is also true! */
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if ( /* (!(flags & ACTION_FOLLOWLINKS) && S_ISLNK(statbuf.st_mode)) || */
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!S_ISDIR(statbuf.st_mode)
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) {
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return fileAction(fileName, &statbuf, userData, depth);
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}
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/* It's a directory (or a link to one, and followLinks is set) */
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if (!(flags & ACTION_RECURSE)) {
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return dirAction(fileName, &statbuf, userData, depth);
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}
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if (!(flags & ACTION_DEPTHFIRST)) {
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status = dirAction(fileName, &statbuf, userData, depth);
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if (!status)
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goto done_nak_warn;
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if (status == SKIP)
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return TRUE;
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}
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dir = opendir(fileName);
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if (!dir) {
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/* findutils-4.1.20 reports this */
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/* (i.e. it doesn't silently return with exit code 1) */
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/* To trigger: "find -exec rm -rf {} \;" */
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goto done_nak_warn;
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}
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status = TRUE;
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while ((next = readdir(dir)) != NULL) {
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char *nextFile;
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nextFile = concat_subpath_file(fileName, next->d_name);
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if (nextFile == NULL)
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continue;
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/* now descend into it (NB: ACTION_RECURSE is set in flags) */
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if (!recursive_action(nextFile, flags, fileAction, dirAction, userData, depth+1))
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status = FALSE;
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free(nextFile);
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}
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closedir(dir);
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if (flags & ACTION_DEPTHFIRST) {
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if (!dirAction(fileName, &statbuf, userData, depth))
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goto done_nak_warn;
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}
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if (!status)
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return FALSE;
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return TRUE;
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done_nak_warn:
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bb_simple_perror_msg(fileName);
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return FALSE;
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}
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