Annotation of mandoc/compat_mkdtemp.c, Revision 1.2
1.1 schwarze 1: #include "config.h"
2:
3: #if HAVE_MKDTEMP
4:
5: int dummy;
6:
7: #else
8:
1.2 ! schwarze 9: /* $Id: compat_mkdtemp.c,v 1.1 2015/03/19 14:57:29 schwarze Exp $ */
1.1 schwarze 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 *
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;
1.2 ! schwarze 48: return NULL;
1.1 schwarze 49: }
50: if (mkdir(path, S_IRUSR | S_IWUSR | S_IXUSR) == 0)
1.2 ! schwarze 51: return path;
1.1 schwarze 52: if (errno != EEXIST)
1.2 ! schwarze 53: return NULL;
1.1 schwarze 54: for (cp = start; *cp != '\0'; cp++)
55: *cp = 'X';
56: }
57: errno = EEXIST;
1.2 ! schwarze 58: return NULL;
1.1 schwarze 59: }
60:
61: #endif
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