Subversion Repositories shark

Rev

Details | Last modification | View Log | RSS feed

Rev Author Line No. Line
2 pj 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
#if defined(LIBC_SCCS) && !defined(lint)
35
#if 0
36
static char sccsid[] = "@(#)mktemp.c    8.1 (Berkeley) 6/4/93";
37
#endif
38
static const char rcsid[] =
39
                "$\Id: mktemp.c,v 1.4.2.1 1997/04/07 18:03:25 guido Exp $";
40
#endif /* LIBC_SCCS and not lint */
41
 
42
#include <sys/types.h>
43
#include <sys/stat.h>
44
#include <fcntl.h>
45
#include <errno.h>
46
#include <stdio.h>
47
#include <ctype.h>
48
#include <unistd.h>
49
 
50
static int _gettemp(char *, int *);
51
 
52
int
53
mkstemp(path)
54
        char *path;
55
{
56
        int fd;
57
 
58
        return (_gettemp(path, &fd) ? fd : -1);
59
}
60
 
61
char *
62
mktemp(path)
63
        char *path;
64
{
65
        return(_gettemp(path, (int *)NULL) ? path : (char *)NULL);
66
}
67
 
68
static int
69
_gettemp(path, doopen)
70
        char *path;
71
        register int *doopen;
72
{
73
        register char *start, *trv;
74
        struct stat sbuf;
75
        pid_t pid;
76
 
77
        pid = getpid();
78
        for (trv = path; *trv; ++trv);          /* extra X's get set to 0's */
79
        while (*--trv == 'X') {
80
                *trv = (pid % 10) + '0';
81
                pid /= 10;
82
        }
83
 
84
        /*
85
         * check the target directory; if you have six X's and it
86
         * doesn't exist this runs for a *very* long time.
87
         */
88
        for (start = trv + 1;; --trv) {
89
                if (trv <= path)
90
                        break;
91
                if (*trv == '/') {
92
                        *trv = '\0';
93
                        if (stat(path, &sbuf))
94
                                return(0);
95
                        if (!S_ISDIR(sbuf.st_mode)) {
96
                                errno = ENOTDIR;
97
                                return(0);
98
                        }
99
                        *trv = '/';
100
                        break;
101
                }
102
        }
103
 
104
        for (;;) {
105
                if (doopen) {
106
                        if ((*doopen =
107
                            open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
108
                                return(1);
109
                        if (errno != EEXIST)
110
                                return(0);
111
                }
112
                else if (lstat(path, &sbuf))
113
                        return(errno == ENOENT ? 1 : 0);
114
 
115
                /* tricky little algorithm for backward compatibility */
116
                for (trv = start;;) {
117
                        if (!*trv)
118
                                return(0);
119
                        if (*trv == 'z')
120
                                *trv++ = 'a';
121
                        else {
122
                                if (isdigit(*trv))
123
                                        *trv = 'a';
124
                                else
125
                                        ++*trv;
126
                                break;
127
                        }
128
                }
129
        }
130
        /*NOTREACHED*/
131
}