tempnam.c revision 92905 
1/*
2 * Copyright (c) 1988, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#if defined(LIBC_SCCS) && !defined(lint)
35#if 0
36static char sccsid[] = "@(#)tempnam.c	8.1 (Berkeley) 6/4/93";
37#endif
38static const char rcsid[] =
39  "$FreeBSD: head/lib/libc/stdio/tempnam.c 92905 2002-03-21 22:49:10Z obrien $";
40#endif /* LIBC_SCCS and not lint */
41
42#include <sys/param.h>
43#include <errno.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <string.h>
47#include <unistd.h>
48#include <paths.h>
49
50__warn_references(tempnam,
51    "warning: tempnam() possibly used unsafely; consider using mkstemp()");
52
53extern char *_mktemp(char *);
54
55char *
56tempnam(dir, pfx)
57	const char *dir, *pfx;
58{
59	int sverrno;
60	char *f, *name;
61
62	if (!(name = malloc(MAXPATHLEN)))
63		return(NULL);
64
65	if (!pfx)
66		pfx = "tmp.";
67
68	if (issetugid() == 0 && (f = getenv("TMPDIR"))) {
69		(void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXX", f,
70		    *(f + strlen(f) - 1) == '/'? "": "/", pfx);
71		if ((f = _mktemp(name)))
72			return(f);
73	}
74
75	if ((f = (char *)dir)) {
76		(void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXX", f,
77		    *(f + strlen(f) - 1) == '/'? "": "/", pfx);
78		if ((f = _mktemp(name)))
79			return(f);
80	}
81
82	f = P_tmpdir;
83	(void)snprintf(name, MAXPATHLEN, "%s%sXXXXXX", f, pfx);
84	if ((f = _mktemp(name)))
85		return(f);
86
87	f = _PATH_TMP;
88	(void)snprintf(name, MAXPATHLEN, "%s%sXXXXXX", f, pfx);
89	if ((f = _mktemp(name)))
90		return(f);
91
92	sverrno = errno;
93	free(name);
94	errno = sverrno;
95	return(NULL);
96}
97