1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1988, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#if defined(LIBC_SCCS) && !defined(lint)
33static char sccsid[] = "@(#)tempnam.c	8.1 (Berkeley) 6/4/93";
34#endif /* LIBC_SCCS and not lint */
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD$");
37
38#include <sys/param.h>
39#include <errno.h>
40#include <stdio.h>
41#include <stdlib.h>
42#include <string.h>
43#include <unistd.h>
44#include <paths.h>
45
46__warn_references(tempnam,
47    "warning: tempnam() possibly used unsafely; consider using mkstemp()");
48
49extern char *_mktemp(char *);
50
51char *
52tempnam(const char *dir, const char *pfx)
53{
54	int sverrno;
55	char *f, *name;
56
57	if (!(name = malloc(MAXPATHLEN)))
58		return(NULL);
59
60	if (!pfx)
61		pfx = "tmp.";
62
63	if (issetugid() == 0 && (f = getenv("TMPDIR"))) {
64		(void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXX", f,
65		    *(f + strlen(f) - 1) == '/'? "": "/", pfx);
66		if ((f = _mktemp(name)))
67			return(f);
68	}
69
70	if ((f = (char *)dir)) {
71		(void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXX", f,
72		    *(f + strlen(f) - 1) == '/'? "": "/", pfx);
73		if ((f = _mktemp(name)))
74			return(f);
75	}
76
77	f = P_tmpdir;
78	(void)snprintf(name, MAXPATHLEN, "%s%sXXXXXX", f, pfx);
79	if ((f = _mktemp(name)))
80		return(f);
81
82	f = _PATH_TMP;
83	(void)snprintf(name, MAXPATHLEN, "%s%sXXXXXX", f, pfx);
84	if ((f = _mktemp(name)))
85		return(f);
86
87	sverrno = errno;
88	free(name);
89	errno = sverrno;
90	return(NULL);
91}
92