/* $NetBSD: mkdir.c,v 1.39 2021/09/13 22:46:02 kre Exp $ */

/*
 * 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.
 */

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1983, 1992, 1993\
 The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)mkdir.c     8.2 (Berkeley) 1/25/94";
#else
__RCSID("$NetBSD: mkdir.c,v 1.39 2021/09/13 22:46:02 kre Exp $");
#endif
#endif /* not lint */

#include <sys/param.h>
#include <sys/stat.h>
#include <sys/types.h>

#include <err.h>
#include <errno.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

static int              mkpath(char *, mode_t, mode_t);
__dead static void      usage(void);

int
main(int argc, char *argv[])
{
        int ch, exitval, pflag;
        void *set;
        mode_t mode, dir_mode;

        setprogname(argv[0]);
        (void)setlocale(LC_ALL, "");

        /*
         * 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.
         */
        mode = (S_IRWXU | S_IRWXG | S_IRWXO) & ~umask(0);
        dir_mode = mode | S_IWUSR | S_IXUSR;

        pflag = 0;
        while ((ch = getopt(argc, argv, "m:p")) != -1)
                switch (ch) {
                case 'p':
                        pflag = 1;
                        break;
                case 'm':
                        if ((set = setmode(optarg)) == NULL) {
                                err(EXIT_FAILURE, "Cannot set file mode `%s'",
                                    optarg);
                                /* NOTREACHED */
                        }
                        mode = getmode(set, S_IRWXU | S_IRWXG | S_IRWXO);
                        free(set);
                        break;
                case '?':
                default:
                        usage();
                        /* NOTREACHED */
                }
        argc -= optind;
        argv += optind;

        if (*argv == NULL) {
                usage();
                /* NOTREACHED */
        }

        for (exitval = EXIT_SUCCESS; *argv != NULL; ++argv) {
#ifdef notdef
                char *slash;

                /* Kernel takes care of this */
                /* Remove trailing slashes, per POSIX. */
                slash = strrchr(*argv, '\0');
                while (--slash > *argv && *slash == '/')
                        *slash = '\0';
#endif

                if (pflag) {
                        if (mkpath(*argv, mode, dir_mode) < 0)
                                exitval = EXIT_FAILURE;
                } else {
                        if (mkdir(*argv, mode) < 0) {
                                warn("%s", *argv);
                                exitval = EXIT_FAILURE;
                        } else {
                                /*
                                 * The mkdir() and umask() calls both honor
                                 * only the file permission bits, so if you try
                                 * to set a mode including the sticky, setuid,
                                 * setgid bits you lose them. So chmod().
                                 */
                                if ((mode & ~(S_IRWXU|S_IRWXG|S_IRWXO)) != 0 &&
                                    chmod(*argv, mode) == -1) {
                                        warn("%s", *argv);
                                        exitval = EXIT_FAILURE;
                                }
                        }
                }
        }
        exit(exitval);
        /* NOTREACHED */
}

/*
 * mkpath -- create directories.
 *      path     - path
 *      mode     - file mode of terminal directory
 *      dir_mode - file mode of intermediate directories
 */
static int
mkpath(char *path, mode_t mode, mode_t dir_mode)
{
        struct stat sb;
        char *slash;
        int done, rv;

        done = 0;
        slash = path;

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

                done = (*(slash + strspn(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;
                                warn("%s", path);
                                return -1;
                        }
                        if (!S_ISDIR(sb.st_mode)) {
                                        /* Is there, but isn't a directory */
                                errno = ENOTDIR;
                                warn("%s", path);
                                return -1;
                        }
                } else if (done) {
                        /*
                         * Created ok, and this is the last element
                         */
                        /*
                         * The mkdir() and umask() calls both honor only the
                         * file permission bits, so if you try to set a mode
                         * including the sticky, setuid, setgid bits you lose
                         * them. So chmod().
                         */
                        if ((mode & ~(S_IRWXU|S_IRWXG|S_IRWXO)) != 0 &&
                            chmod(path, mode) == -1) {
                                warn("%s", path);
                                return -1;
                        }
                }

                if (done) {
                        break;
                }
                *slash = '/';
        }

        return 0;
}

static void
usage(void)
{

        (void)fprintf(stderr, "usage: %s [-p] [-m mode] dirname ...\n",
            getprogname());
        exit(EXIT_FAILURE);
        /* NOTREACHED */
}