1 #include "config.h"
2
3 #if HAVE_MKDTEMP
4
5 int 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
35 char *
mkdtemp(char * path)36 mkdtemp(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