1/*	$NetBSD: mktemp.c,v 1.1.1.1 2009/04/12 15:33:26 christos Exp $	*/
2
3#if defined(LIBC_SCCS) && !defined(lint)
4static const char sccsid[] = "@(#)mktemp.c	8.1 (Berkeley) 6/4/93";
5static const char rcsid[] = "Id: mktemp.c,v 1.2 2005/04/27 04:56:11 sra Exp";
6#endif /* LIBC_SCCS and not lint */
7
8/*
9 * Copyright (c) 1987, 1993
10 *    The Regents of the University of California.  All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 *    must display the following acknowledgement:
22 * 	This product includes software developed by the University of
23 * 	California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 *    may be used to endorse or promote products derived from this software
26 *    without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 */
40
41/*
42 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
43 *
44 * Permission to use, copy, modify, and distribute this software for any
45 * purpose with or without fee is hereby granted, provided that the above
46 * copyright notice and this permission notice appear in all copies, and that
47 * the name of Digital Equipment Corporation not be used in advertising or
48 * publicity pertaining to distribution of the document or software without
49 * specific, written prior permission.
50 *
51 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
52 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
53 * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
54 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
55 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
56 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
57 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
58 * SOFTWARE.
59 */
60
61#include "port_before.h"
62
63#include <sys/types.h>
64#include <sys/stat.h>
65
66#include <ctype.h>
67#include <errno.h>
68#include <fcntl.h>
69#include <stdio.h>
70
71#include "port_after.h"
72
73#if (!defined(NEED_MKTEMP)) && (!defined(NEED_MKSTEMP))
74int __mktemp_unneeded__;
75#else
76
77static int gettemp(char *path, int *doopen);
78
79#ifdef NEED_MKSTEMP
80mkstemp(char *path) {
81	int fd;
82
83	return (gettemp(path, &fd) ? fd : -1);
84}
85#endif
86
87#ifdef NEED_MKTEMP
88char *
89mktemp(char *path) {
90	return(gettemp(path, (int *)NULL) ? path : (char *)NULL);
91}
92#endif
93
94static int
95gettemp(char *path, int *doopen) {
96	char *start, *trv;
97	struct stat sbuf;
98	u_int pid;
99
100	pid = getpid();
101	for (trv = path; *trv; ++trv);		/*%< extra X's get set to 0's */
102	while (*--trv == 'X') {
103		*trv = (pid % 10) + '0';
104		pid /= 10;
105	}
106
107	/*
108	 * check the target directory; if you have six X's and it
109	 * doesn't exist this runs for a *very* long time.
110	 */
111	for (start = trv + 1;; --trv) {
112		if (trv <= path)
113			break;
114		if (*trv == '/') {
115			*trv = '\0';
116			if (stat(path, &sbuf))
117				return(0);
118			if (!S_ISDIR(sbuf.st_mode)) {
119				errno = ENOTDIR;
120				return(0);
121			}
122			*trv = '/';
123			break;
124		}
125	}
126
127	for (;;) {
128		if (doopen) {
129			if ((*doopen =
130			    open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
131				return(1);
132			if (errno != EEXIST)
133				return(0);
134		}
135		else if (stat(path, &sbuf))
136			return(errno == ENOENT ? 1 : 0);
137
138		/* tricky little algorithm for backward compatibility */
139		for (trv = start;;) {
140			if (!*trv)
141				return(0);
142			if (*trv == 'z')
143				*trv++ = 'a';
144			else {
145				if (isdigit(*trv))
146					*trv = 'a';
147				else
148					++*trv;
149				break;
150			}
151		}
152	}
153	/*NOTREACHED*/
154}
155
156#endif /*NEED_MKTEMP*/
157
158/*! \file */
159