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_impl.h"

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

        if ((ppath = strdup(path)) == NULL)
                return -1;

        slash = ppath;
        /*
         * 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_IRUSR | S_IXUSR | S_IROTH | S_IXOTH;

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

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

                if (mkdir(ppath, done ? mode : dir_mode) == -1) {
                        /*
                         * Can't create; path exists or no perms.
                         * stat() path to determine what's there now.
                         */
                        int     sverrno;

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

                *slash = '/';
        }
        free(ppath);

        return 0;
}