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)
33 static char sccsid[] = "@(#)tempnam.c 8.1 (Berkeley) 6/4/93";
34 #endif /* LIBC_SCCS and not lint */
35 #include <sys/cdefs.h>
36 #include <sys/param.h>
37 #include <errno.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <unistd.h>
42 #include <paths.h>
43
44 __warn_references(tempnam,
45 "warning: tempnam() possibly used unsafely; consider using mkstemp()");
46
47 extern char *_mktemp(char *);
48
49 char *
tempnam(const char * dir,const char * pfx)50 tempnam(const char *dir, const char *pfx)
51 {
52 int sverrno;
53 char *f, *name;
54
55 if (!(name = malloc(MAXPATHLEN)))
56 return(NULL);
57
58 if (!pfx)
59 pfx = "tmp.";
60
61 if (issetugid() == 0 && (f = getenv("TMPDIR"))) {
62 (void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXX", f,
63 *(f + strlen(f) - 1) == '/'? "": "/", pfx);
64 if ((f = _mktemp(name)))
65 return(f);
66 }
67
68 if ((f = (char *)dir)) {
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 f = P_tmpdir;
76 (void)snprintf(name, MAXPATHLEN, "%s%sXXXXXX", f, pfx);
77 if ((f = _mktemp(name)))
78 return(f);
79
80 f = _PATH_TMP;
81 (void)snprintf(name, MAXPATHLEN, "%s%sXXXXXX", f, pfx);
82 if ((f = _mktemp(name)))
83 return(f);
84
85 sverrno = errno;
86 free(name);
87 errno = sverrno;
88 return(NULL);
89 }
90