1#include "config.h"
2
3#if HAVE_MKDTEMP
4
5int dummy;
6
7#else
8
9/*	$Id: compat_mkdtemp.c,v 1.2 2015/10/06 18:32:19 schwarze Exp $	*/
10/*
11 * Copyright (c) 2015 Ingo Schwarze <schwarze@openbsd.org>
12 *
13 * Permission to use, copy, modify, and distribute this software for any
14 * purpose with or without fee is hereby granted, provided that the above
15 * copyright notice and this permission notice appear in all copies.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
18 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
20 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
21 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
22 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
23 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
24 *
25 * The algorithm of this function is inspired by OpenBSD mkdtemp(3)
26 * by Theo de Raadt and Todd Miller, but the code differs.
27 */
28
29#include <sys/stat.h>
30#include <errno.h>
31#include <limits.h>
32#include <stdlib.h>
33#include <string.h>
34
35char *
36mkdtemp(char *path)
37{
38	char		*start, *cp;
39	unsigned	 int tries;
40
41	start = strchr(path, '\0');
42	while (start > path && start[-1] == 'X')
43		start--;
44
45	for (tries = INT_MAX; tries; tries--) {
46		if (mktemp(path) == NULL) {
47			errno = EEXIST;
48			return NULL;
49		}
50		if (mkdir(path, S_IRUSR | S_IWUSR | S_IXUSR) == 0)
51			return path;
52		if (errno != EEXIST)
53			return NULL;
54		for (cp = start; *cp != '\0'; cp++)
55			*cp = 'X';
56	}
57	errno = EEXIST;
58	return NULL;
59}
60
61#endif
62