forked from Imagelibrary/rtems
142 lines
3.8 KiB
C
142 lines
3.8 KiB
C
/**
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* @file
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*
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* @ingroup LibIO
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*
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* @brief rtems_mkdir() implementation.
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*
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* The implementation is based on FreeBSD 'bin/mkdir/mkdir.c' revision 163213.
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*/
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/*-
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* Copyright (c) 2010 embedded brains GmbH.
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*
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* Copyright (c) 1983, 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <rtems/libio.h>
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/*
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* Returns 1 if a directory has been created,
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* 2 if it already existed, and 0 on failure.
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*/
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static int
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build(char *path, mode_t omode)
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{
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struct stat sb;
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mode_t numask, oumask;
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int first, last, retval;
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char *p;
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p = path;
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oumask = 0;
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retval = 1;
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if (p[0] == '/') /* Skip leading '/'. */
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++p;
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for (first = 1, last = 0; !last ; ++p) {
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if (p[0] == '\0')
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last = 1;
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else if (p[0] != '/')
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continue;
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*p = '\0';
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if (!last && p[1] == '\0')
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last = 1;
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if (first) {
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/*
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* POSIX 1003.2:
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* For each dir operand that does not name an existing
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* directory, effects equivalent to those caused by the
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* following command shall occcur:
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*
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* mkdir -p -m $(umask -S),u+wx $(dirname dir) &&
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* mkdir [-m mode] dir
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*
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* We change the user's umask and then restore it,
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* instead of doing chmod's.
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*/
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oumask = umask(0);
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numask = oumask & ~(S_IWUSR | S_IXUSR);
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(void)umask(numask);
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first = 0;
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}
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if (last)
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(void)umask(oumask);
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if (mkdir(path, last ? omode : S_IRWXU | S_IRWXG | S_IRWXO) < 0) {
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if (errno == EEXIST || errno == EISDIR) {
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if (stat(path, &sb) < 0) {
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retval = 0;
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break;
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} else if (!S_ISDIR(sb.st_mode)) {
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if (last)
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errno = EEXIST;
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else
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errno = ENOTDIR;
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retval = 0;
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break;
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}
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if (last)
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retval = 2;
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} else {
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retval = 0;
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break;
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}
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}
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if (!last)
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*p = '/';
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}
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if (!first && !last)
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(void)umask(oumask);
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return (retval);
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}
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int
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rtems_mkdir(const char *path, mode_t mode)
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{
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int success = 0;
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char *dup_path = strdup(path);
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if (dup_path != NULL) {
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success = build(dup_path, mode);
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free(dup_path);
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}
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return success != 0 ? 0 : -1;
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}
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