mktemp.c - vx32 - Local 9vx git repository for patches.
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mktemp.c (4208B)
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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 <sys/types.h>
35 #include <sys/stat.h>
36 #include <fcntl.h>
37 #include <errno.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <ctype.h>
42 #include <unistd.h>
43
44 char *_mktemp(char *);
45
46 static int _gettemp(char *, int *, int, int);
47
48 static const unsigned char padchar[] =
49 "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
50
51 int
52 mkstemps(path, slen)
53 char *path;
54 int slen;
55 {
56 int fd;
57
58 return (_gettemp(path, &fd, 0, slen) ? fd : -1);
59 }
60
61 int
62 mkstemp(path)
63 char *path;
64 {
65 int fd;
66
67 return (_gettemp(path, &fd, 0, 0) ? fd : -1);
68 }
69
70 char *
71 mkdtemp(path)
72 char *path;
73 {
74 return (_gettemp(path, (int *)NULL, 1, 0) ? path : (char *)NULL);
75 }
76
77 char *
78 _mktemp(path)
79 char *path;
80 {
81 return (_gettemp(path, (int *)NULL, 0, 0) ? path : (char *)NULL);
82 }
83
84 char *
85 mktemp(path)
86 char *path;
87 {
88 return (_mktemp(path));
89 }
90
91 static int
92 _gettemp(path, doopen, domkdir, slen)
93 char *path;
94 int *doopen;
95 int domkdir;
96 int slen;
97 {
98 char *start, *trv, *suffp;
99 char *pad;
100 struct stat sbuf;
101 int rval;
102 uint32_t randx;
103
104 if (doopen != NULL && domkdir) {
105 errno = EINVAL;
106 return (0);
107 }
108
109 for (trv = path; *trv != '\0'; ++trv)
110 ;
111 trv -= slen;
112 suffp = trv;
113 --trv;
114 if (trv < path) {
115 errno = EINVAL;
116 return (0);
117 }
118
119 /* Fill space with random characters */
120 while (trv >= path && *trv == 'X') {
121 randx = rand() % (sizeof(padchar) - 1);
122 *trv-- = padchar[randx];
123 }
124 start = trv + 1;
125
126 /*
127 * check the target directory.
128 */
129 if (doopen != NULL || domkdir) {
130 for (; trv > path; --trv) {
131 if (*trv == '/') {
132 *trv = '\0';
133 rval = stat(path, &sbuf);
134 *trv = '/';
135 if (rval != 0)
136 return (0);
137 if (!S_ISDIR(sbuf.st_mode)) {
138 errno = ENOTDIR;
139 return (0);
140 }
141 break;
142 }
143 }
144 }
145
146 for (;;) {
147 if (doopen) {
148 if ((*doopen =
149 open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
150 return (1);
151 if (errno != EEXIST)
152 return (0);
153 } else if (domkdir) {
154 if (mkdir(path, 0700) == 0)
155 return (1);
156 if (errno != EEXIST)
157 return (0);
158 } else if (lstat(path, &sbuf))
159 return (errno == ENOENT);
160
161 /* If we have a collision, cycle through the space of filenames */
162 for (trv = start;;) {
163 if (*trv == '\0' || trv == suffp)
164 return (0);
165 pad = strchr(padchar, *trv);
166 if (pad == NULL || *++pad == '\0')
167 *trv++ = padchar[0];
168 else {
169 *trv++ = *pad;
170 break;
171 }
172 }
173 }
174 /*NOTREACHED*/
175 }