1/*	$OpenBSD: tempnam.c,v 1.14 2005/08/08 08:05:36 espie Exp $ */
2/*
3 * Copyright (c) 1988, 1993
4 *	The Regents of the University of California.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the University nor the names of its contributors
15 *    may be used to endorse or promote products derived from this software
16 *    without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <sys/param.h>
32#include <errno.h>
33#include <stdio.h>
34#include <stdlib.h>
35#include <string.h>
36#include <unistd.h>
37#include <paths.h>
38
39__warn_references(tempnam,
40    "warning: tempnam() possibly used unsafely; consider using mkstemp()");
41
42extern char *_mktemp(char *);
43
44char *
45tempnam(const char *dir, const char *pfx)
46{
47	int sverrno;
48	char *f, *name;
49
50	if (!(name = malloc(MAXPATHLEN)))
51		return(NULL);
52
53	if (!pfx)
54		pfx = "tmp.";
55
56	if (issetugid() == 0 && (f = getenv("TMPDIR"))) {
57		(void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXXXXXX", f,
58		    *(f + strlen(f) - 1) == '/'? "": "/", pfx);
59		if ((f = _mktemp(name)))
60			return(f);
61	}
62
63	if ((f = (char *)dir)) {
64		(void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXXXXXX", f,
65		    *(f + strlen(f) - 1) == '/'? "": "/", pfx);
66		if ((f = _mktemp(name)))
67			return(f);
68	}
69
70	f = P_tmpdir;
71	(void)snprintf(name, MAXPATHLEN, "%s%sXXXXXXXXX", f, pfx);
72	if ((f = _mktemp(name)))
73		return(f);
74
75	f = _PATH_TMP;
76	(void)snprintf(name, MAXPATHLEN, "%s%sXXXXXXXXX", f, pfx);
77	if ((f = _mktemp(name)))
78		return(f);
79
80	sverrno = errno;
81	free(name);
82	errno = sverrno;
83	return(NULL);
84}
85