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/* $NetBSD: remove.c,v 1.1.2.2 2008/08/06 12:58:52 joerg Exp $ */
/*-
* Copyright (c) 2008 Joerg Sonnenberger <joerg@NetBSD.org>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <nbcompat.h>
#if HAVE_SYS_CDEFS_H
#include <sys/cdefs.h>
#endif
__RCSID("$NetBSD: remove.c,v 1.1.2.2 2008/08/06 12:58:52 joerg Exp $");
#if HAVE_DIRENT_H
#include <dirent.h>
#endif
#if HAVE_ERR_H
#include <err.h>
#endif
#include <errno.h>
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "lib.h"
static int
safe_fchdir(int cwd)
{
int tmp_errno, rv;
tmp_errno = errno;
rv = fchdir(cwd);
errno = tmp_errno;
return rv;
}
static int
long_remove(const char **path_ptr, int missing_ok, int *did_chdir)
{
char tmp_path[PATH_MAX + 1];
const char *slash, *path;
size_t i, len;
int rv;
path = *path_ptr;
len = strlen(path);
*did_chdir = 0;
while (len >= PATH_MAX) {
slash = path;
for (i = PATH_MAX - 1; i > 0; --i) {
if (path[i] == '/')
break;
}
if (i == 0) {
errno = ENAMETOOLONG;
return -1; /* Assumes PATH_MAX > NAME_MAX */
}
memcpy(tmp_path, path, i);
tmp_path[i] = '\0';
if (chdir(tmp_path))
return -1;
*did_chdir = 1;
path += i + 1;
len -= i + 1;
}
if (remove(path) == 0 || (errno == ENOENT && missing_ok))
rv = 0;
else
rv = -1;
*path_ptr = path;
return rv;
}
static int
recursive_remove_internal(const char *path, int missing_ok, int cwd)
{
DIR *dir;
struct dirent *de;
const char *sub_path;
char *subdir;
int did_chdir, rv;
/*
* If the argument is longer than PATH_MAX, long_remove
* will try to shorten it using chdir. So before returning,
* make sure to fchdir back to the original cwd.
*/
sub_path = path;
if (long_remove(&sub_path, missing_ok, &did_chdir) == 0)
rv = 0;
else if (errno != ENOTEMPTY) /* Other errors are terminal. */
rv = -1;
else
rv = 1;
if (rv != 1) {
if (did_chdir && safe_fchdir(cwd) == -1 && rv == 0)
rv = -1;
return rv;
}
if ((dir = opendir(sub_path)) == NULL) {
if (errno == EMFILE)
warn("opendir failed");
return -1;
}
if (did_chdir && fchdir(cwd) == -1)
return -1;
rv = 0;
while ((de = readdir(dir)) != NULL) {
if (strcmp(de->d_name, ".") == 0)
continue;
if (strcmp(de->d_name, "..") == 0)
continue;
subdir = xasprintf("%s/%s", path, de->d_name);
rv = recursive_remove_internal(subdir, 1, cwd);
free(subdir);
}
closedir(dir);
safe_fchdir(cwd);
rv |= long_remove(&path, missing_ok, &did_chdir);
if (did_chdir && safe_fchdir(cwd) == -1 && rv == 0)
rv = -1;
return rv;
}
int
recursive_remove(const char *path, int missing_ok)
{
int orig_cwd, rv;
/* First try the easy case of regular file or empty directory. */
if (remove(path) == 0 || (errno == ENOENT && missing_ok))
return 0;
/*
* If the path is too long, long_remove will use chdir to shorten it,
* so remember the current directory first.
*/
if ((orig_cwd = open(".", O_RDONLY)) == -1)
return -1;
rv = recursive_remove_internal(path, missing_ok, orig_cwd);
close(orig_cwd);
return rv;
}
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