source: src/router/busybox/libbb/make_directory.c @ 8864

/* vi: set sw=4 ts=4: */
/*
 * parse_mode implementation for busybox
 *
 * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

/* Mar 5, 2003    Manuel Novoa III
 *
 * This is the main work function for the 'mkdir' applet.  As such, it
 * strives to be SUSv3 compliant in it's behaviour when recursively
 * making missing parent dirs, and in it's mode setting of the final
 * directory 'path'.
 *
 * To recursively build all missing intermediate directories, make
 * sure that (flags & FILEUTILS_RECUR) is non-zero.  Newly created
 * intermediate directories will have at least u+wx perms.
 *
 * To set specific permissions on 'path', pass the appropriate 'mode'
 * val.  Otherwise, pass -1 to get default permissions.
 */

#include "libbb.h"

/* This function is used from NOFORK applets. It must not allocate anything */

int bb_make_directory (char *path, long mode, int flags)
{
        mode_t mask;
        const char *fail_msg;
        char *s = path;
        char c;
        struct stat st;

        mask = umask(0);
        if (mode == -1) {
                umask(mask);
                mode = (S_IXUSR | S_IXGRP | S_IXOTH |
                                S_IWUSR | S_IWGRP | S_IWOTH |
                                S_IRUSR | S_IRGRP | S_IROTH) & ~mask;
        } else {
                umask(mask & ~0300);
        }

        do {
                c = 0;

                if (flags & FILEUTILS_RECUR) {  /* Get the parent. */
                        /* Bypass leading non-'/'s and then subsequent '/'s. */
                        while (*s) {
                                if (*s == '/') {
                                        do {
                                                ++s;
                                        } while (*s == '/');
                                        c = *s;         /* Save the current char */
                                        *s = 0;         /* and replace it with nul. */
                                        break;
                                }
                                ++s;
                        }
                }

                if (mkdir(path, 0777) < 0) {
                        /* If we failed for any other reason than the directory
                         * already exists, output a diagnostic and return -1.*/
                        if (errno != EEXIST
                                || !(flags & FILEUTILS_RECUR)
                                || (stat(path, &st) < 0 || !S_ISDIR(st.st_mode))) {
                                fail_msg = "create";
                                umask(mask);
                                break;
                        }
                        /* Since the directory exists, don't attempt to change
                         * permissions if it was the full target.  Note that
                         * this is not an error conditon. */
                        if (!c) {
                                umask(mask);
                                return 0;
                        }
                }

                if (!c) {
                        /* Done.  If necessary, updated perms on the newly
                         * created directory.  Failure to update here _is_
                         * an error.*/
                        umask(mask);
                        if ((mode != -1) && (chmod(path, mode) < 0)){
                                fail_msg = "set permissions of";
                                break;
                        }
                        return 0;
                }

                /* Remove any inserted nul from the path (recursive mode). */
                *s = c;

        } while (1);

        bb_perror_msg("cannot %s directory '%s'", fail_msg, path);
        return -1;
}