xbps/lib/mkpath.c

/*
 * Copyright (c) 1983, 1992, 1993
 *	The Regents of the University of California.  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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 */

/*
 * The following is a modified function from NetBSD's src/bin/mkdir/mkdir.c
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/stat.h>

#include <xbps_api.h>

/**
 * @file lib/mkpath.c
 * @brief Generic directory creation routines
 * @defgroup dircreate Generic directory creation functions
 */

int
xbps_mkpath(char *path, mode_t mode)
{
	struct stat sb;
	char *slash = path;
	int done = 0, rv;
	mode_t dir_mode;

	/*
	 * The default file mode is a=rwx (0777) with selected permissions
	 * removed in accordance with the file mode creation mask.  For
	 * intermediate path name components, the mode is the default modified
	 * by u+wx so that the subdirectories can always be created.
	 */
	if (mode == 0)
		mode = (S_IRWXU | S_IRWXG | S_IRWXO) & ~umask(0);

	dir_mode = mode | S_IWUSR | S_IXUSR;

	for (;;) {
		slash += strspn(slash, "/");
		slash += strcspn(slash, "/");

		done = (*slash == '\0');
		*slash = '\0';

		rv = mkdir(path, done ? mode : dir_mode);
		if (rv < 0) {
			/*
			 * Can't create; path exists or no perms.
			 * stat() path to determine what's there now.
			 */
			int	sverrno;

			sverrno = errno;
			if (stat(path, &sb) < 0) {
					/* Not there; use mkdir()s error */
				errno = sverrno;
				return -1;
			}
			if (!S_ISDIR(sb.st_mode)) {
					/* Is there, but isn't a directory */
				errno = ENOTDIR;
				return -1;
			}
		}
		if (done)
			break;

		*slash = '/';
	}

	return 0;
}