busybox/libbb/make_directory.c

/* 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 <errno.h>
#include <unistd.h>
#include <sys/stat.h>
#include "libbb.h"

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;
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* parse_mode implementation for busybox
4	*
5	* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
6	*
7	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8	*/
9
10	/* Mar 5, 2003 Manuel Novoa III
11	*
12	* This is the main work function for the 'mkdir' applet. As such, it
13	* strives to be SUSv3 compliant in it's behaviour when recursively
14	* making missing parent dirs, and in it's mode setting of the final
15	* directory 'path'.
16	*
17	* To recursively build all missing intermediate directories, make
18	* sure that (flags & FILEUTILS_RECUR) is non-zero. Newly created
19	* intermediate directories will have at least u+wx perms.
20	*
21	* To set specific permissions on 'path', pass the appropriate 'mode'
22	* val. Otherwise, pass -1 to get default permissions.
23	*/
24
25	#include <errno.h>
26	#include <unistd.h>
27	#include <sys/stat.h>
28	#include "libbb.h"
29
30	int bb_make_directory (char *path, long mode, int flags)
31	{
32	mode_t mask;
33	const char *fail_msg;
34	char *s = path;
35	char c;
36	struct stat st;
37
38	mask = umask(0);
39	if (mode == -1) {
40	umask(mask);
41	mode = (S_IXUSR \| S_IXGRP \| S_IXOTH \|
42	S_IWUSR \| S_IWGRP \| S_IWOTH \|
43	S_IRUSR \| S_IRGRP \| S_IROTH) & ~mask;
44	} else {
45	umask(mask & ~0300);
46	}
47
48	do {
49	c = 0;
50
51	if (flags & FILEUTILS_RECUR) { /* Get the parent. */
52	/* Bypass leading non-'/'s and then subsequent '/'s. */
53	while (*s) {
54	if (*s == '/') {
55	do {
56	++s;
57	} while (*s == '/');
58	c = s; / Save the current char */
59	s = 0; / and replace it with nul. */
60	break;
61	}
62	++s;
63	}
64	}
65
66	if (mkdir(path, 0777) < 0) {
67	/* If we failed for any other reason than the directory
68	* already exists, output a diagnostic and return -1.*/
69	if (errno != EEXIST
70	\|\| !(flags & FILEUTILS_RECUR)
71	\|\| (stat(path, &st) < 0 \|\| !S_ISDIR(st.st_mode))) {
72	fail_msg = "create";
73	umask(mask);
74	break;
75	}
76	/* Since the directory exists, don't attempt to change
77	* permissions if it was the full target. Note that
78	* this is not an error conditon. */
79	if (!c) {
80	umask(mask);
81	return 0;
82	}
83	}
84
85	if (!c) {
86	/* Done. If necessary, updated perms on the newly
87	* created directory. Failure to update here _is_
88	* an error.*/
89	umask(mask);
90	if ((mode != -1) && (chmod(path, mode) < 0)){
91	fail_msg = "set permissions of";
92	break;
93	}
94	return 0;
95	}
96
97	/* Remove any inserted nul from the path (recursive mode). */
98	*s = c;
99
100	} while (1);
101
102	bb_perror_msg ("cannot %s directory '%s'", fail_msg, path);
103	return -1;
104	}