1 /*
2 * Copyright (c) 1987, 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 #include "config.h"
35
36 #if defined(LIBC_SCCS) && !defined(lint)
37 static const char sccsid[] = "@(#)mktemp.c 8.1 (Berkeley) 6/4/93";
38 #endif /* LIBC_SCCS and not lint */
39 #else
40 __RCSID("$NetBSD: mkstemp.c,v 1.2 2014/01/26 21:43:45 christos Exp $");
41 #endif
42
43 #include <sys/types.h>
44 #include <sys/stat.h>
45 #include <fcntl.h>
46 #include <errno.h>
47 #include <stdio.h>
48 #include <ctype.h>
49
50 static int _gettemp(char *path, register int *doopen);
51
52 /*
53 * PUBLIC: #ifndef HAVE_MKSTEMP
54 * PUBLIC: int mkstemp __P((char *));
55 * PUBLIC: #endif
56 */
mkstemp(char * path)57 mkstemp(char *path)
58 {
59 int fd;
60
61 return (_gettemp(path, &fd) ? fd : -1);
62 }
63
64 char *
mktemp(char * path)65 mktemp(char *path)
66 {
67 return(_gettemp(path, (int *)NULL) ? path : (char *)NULL);
68 }
69
70 static
_gettemp(char * path,register int * doopen)71 _gettemp(char *path, register int *doopen)
72 {
73 extern int errno;
74 register char *start, *trv;
75 struct stat sbuf;
76 u_int pid;
77
78 pid = getpid();
79 for (trv = path; *trv; ++trv); /* extra X's get set to 0's */
80 while (*--trv == 'X') {
81 *trv = (pid % 10) + '0';
82 pid /= 10;
83 }
84
85 /*
86 * check the target directory; if you have six X's and it
87 * doesn't exist this runs for a *very* long time.
88 */
89 for (start = trv + 1;; --trv) {
90 if (trv <= path)
91 break;
92 if (*trv == '/') {
93 *trv = '\0';
94 if (stat(path, &sbuf))
95 return(0);
96 if (!S_ISDIR(sbuf.st_mode)) {
97 errno = ENOTDIR;
98 return(0);
99 }
100 *trv = '/';
101 break;
102 }
103 }
104
105 for (;;) {
106 if (doopen) {
107 if ((*doopen =
108 open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
109 return(1);
110 if (errno != EEXIST)
111 return(0);
112 }
113 else if (stat(path, &sbuf))
114 return(errno == ENOENT ? 1 : 0);
115
116 /* tricky little algorithm for backward compatibility */
117 for (trv = start;;) {
118 if (!*trv)
119 return(0);
120 if (*trv == 'z')
121 *trv++ = 'a';
122 else {
123 if (isdigit(*trv))
124 *trv = 'a';
125 else
126 ++*trv;
127 break;
128 }
129 }
130 }
131 /*NOTREACHED*/
132 }
133