/*
 * 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.
 *
 * @(#) Copyright (c) 1983, 1992, 1993 The Regents of the University of California.  All rights reserved.
 * @(#)mkdir.c  8.2 (Berkeley) 1/25/94
 * $FreeBSD: src/bin/mkdir/mkdir.c,v 1.19.2.2 2001/08/01 04:42:37 obrien Exp $
 */

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

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

static int      build(char *, mode_t);
static int      mkdir_race(const char *path, int nmode);
static void     usage(void);

static int      vflag;

int
main(int argc, char **argv)
{
        int ch, exitval, success, pflag;
        void *set;
        mode_t omode;
        char *mode;

        pflag = 0;
        mode = NULL;
        while ((ch = getopt(argc, argv, "m:pv")) != -1)
                switch(ch) {
                case 'm':
                        mode = optarg;
                        break;
                case 'p':
                        pflag = 1;
                        break;
                case 'v':
                        vflag = 1;
                        break;
                default:
                        usage();
                }

        argc -= optind;
        argv += optind;
        if (argv[0] == NULL)
                usage();

        if (mode == NULL) {
                omode = S_IRWXU | S_IRWXG | S_IRWXO;
        } else {
                errno = 0;
                if ((set = setmode(mode)) == NULL) {
                        if (!errno)
                                errx(1, "invalid file mode: %s", mode);
                        else
                                /* A malloc(3) error, not a invaild file mode. */       
                                err(1, "setmode failed");
                }
                omode = getmode(set, S_IRWXU | S_IRWXG | S_IRWXO);
                free(set);
        }

        for (exitval = 0; *argv != NULL; ++argv) {
                success = 1;
                if (pflag) {
                        if (build(*argv, omode))
                                success = 0;
                } else if (mkdir(*argv, omode) < 0) {
                        if (errno == ENOTDIR || errno == ENOENT)
                                warn("%s", dirname(*argv));
                        else
                                warn("%s", *argv);
                        success = 0;
                } else if (vflag)
                        printf("%s\n", *argv);
                
                if (!success)
                        exitval = 1;
                /*
                 * The mkdir() and umask() calls both honor only the low
                 * nine bits, so if you try to set a mode including the
                 * sticky, setuid, setgid bits you lose them.  Don't do
                 * this unless the user has specifically requested a mode,
                 * as chmod will (obviously) ignore the umask.
                 */
                if (success && mode != NULL && chmod(*argv, omode) == -1) {
                        warn("%s", *argv);
                        exitval = 1;
                }
        }
        exit(exitval);
}

static int
build(char *path, mode_t omode)
{
        struct stat sb;
        mode_t numask, oumask;
        int first, last, retval;
        char *p;

        p = path;
        oumask = 0;
        retval = 0;
        if (p[0] == '/')                /* Skip leading '/'. */
                ++p;
        for (first = 1, last = 0; !last ; ++p) {
                if (p[0] == '\0')
                        last = 1;
                else if (p[0] != '/')
                        continue;
                *p = '\0';
                if (!last && p[1] == '\0')
                        last = 1;
                if (first) {
                        /*
                         * POSIX 1003.2:
                         * For each dir operand that does not name an existing
                         * directory, effects equivalent to those cased by the
                         * following command shall occcur:
                         *
                         * mkdir -p -m $(umask -S),u+wx $(dirname dir) &&
                         *    mkdir [-m mode] dir
                         *
                         * We change the user's umask and then restore it,
                         * instead of doing chmod's.
                         */
                        oumask = umask(0);
                        numask = oumask & ~(S_IWUSR | S_IXUSR);
                        umask(numask);
                        first = 0;
                }
                if (last)
                        umask(oumask);
                if (stat(path, &sb)) {
                        if (errno != ENOENT ||
                            mkdir_race(path, last ? omode :
                                  S_IRWXU | S_IRWXG | S_IRWXO) < 0) {
                                warn("%s", path);
                                retval = 1;
                                break;
                        } else if (vflag)
                                printf("%s\n", path);
                }
                else if ((sb.st_mode & S_IFMT) != S_IFDIR) {
                        if (last)
                                errno = EEXIST;
                        else
                                errno = ENOTDIR;
                        warn("%s", path);
                        retval = 1;
                        break;
                }
                if (!last)
                    *p = '/';
        }
        if (!first && !last)
                umask(oumask);
        return (retval);
}

int
mkdir_race(const char *path, int nmode)
{
        int res;
        struct stat sb;

        res = mkdir(path, nmode);
        if (res < 0 && errno == EEXIST) {
               if (stat(path, &sb) == 0 && S_ISDIR(sb.st_mode))
                       return(0);
               res = mkdir(path, nmode);
        }
        return (res);
}

static void
usage(void)
{

        fprintf(stderr, "usage: mkdir [-pv] [-m mode] directory ...\n");
        exit (EX_USAGE);
}