1 /** @file
2 Internal function to generate temporary file name for tmpnam.
3
4 Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
5 This program and the accompanying materials are licensed and made available
6 under the terms and conditions of the BSD License that accompanies this
7 distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php.
9
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
12
13 Copyright (c) 1987, 1993
14 The Regents of the University of California. All rights reserved.
15
16 Redistribution and use in source and binary forms, with or without
17 modification, are permitted provided that the following conditions
18 are met:
19 1. Redistributions of source code must retain the above copyright
20 notice, this list of conditions and the following disclaimer.
21 2. Redistributions in binary form must reproduce the above copyright
22 notice, this list of conditions and the following disclaimer in the
23 documentation and/or other materials provided with the distribution.
24 3. 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 mktemp.c 8.1 (Berkeley) 6/4/93
41 NetBSD: gettemp.c,v 1.13 2003/12/05 00:57:36 uebayasi Exp
42 **/
43 #include <LibConfig.h>
44
45 #if HAVE_NBTOOL_CONFIG_H
46 #include "nbtool_config.h"
47 #endif
48
49 #if !defined(HAVE_NBTOOL_CONFIG_H) || !defined(HAVE_MKSTEMP) || !defined(HAVE_MKDTEMP)
50
51 #include <sys/EfiCdefs.h>
52
53 #include <sys/types.h>
54 #include <sys/stat.h>
55
56 #include <assert.h>
57 #include <ctype.h>
58 #include <errno.h>
59 #include <fcntl.h>
60 #include <stdio.h>
61 #include <stdlib.h>
62 #include <unistd.h>
63
64 #if HAVE_NBTOOL_CONFIG_H
65 #define GETTEMP gettemp
66 #else
67 #include "reentrant.h"
68 #include "local.h"
69 #define GETTEMP __gettemp
70 #endif
71
72 int
GETTEMP(char * path,int * doopen,int domkdir)73 GETTEMP(
74 char *path,
75 int *doopen,
76 int domkdir
77 )
78 {
79 char *start, *trv;
80 struct stat sbuf;
81
82 /* To guarantee multiple calls generate unique names even if
83 the file is not created. 676 different possibilities with 7
84 or more X's, 26 with 6 or less. */
85 static char xtra[] = "aa";
86 int xcnt = 0;
87
88 _DIAGASSERT(path != NULL);
89 /* doopen may be NULL */
90
91 /* Move to end of path and count trailing X's. */
92 for (trv = path; *trv; ++trv) {
93 if (*trv == 'X') {
94 xcnt++;
95 }
96 else {
97 xcnt = 0;
98 }
99 }
100
101 /* Use at least one from xtra. Use 2 if more than 6 X's. */
102 if (*(trv - 1) == 'X')
103 *--trv = xtra[0];
104 if (xcnt > 6 && *(trv - 1) == 'X')
105 *--trv = xtra[1];
106
107 /* Set remaining X's to 0's. */
108 while (*--trv == 'X') {
109 *trv = '0';
110 }
111
112 /* update xtra for next call. */
113 if (xtra[0] != 'z')
114 xtra[0]++;
115 else {
116 xtra[0] = 'a';
117 if (xtra[1] != 'z')
118 xtra[1]++;
119 else
120 xtra[1] = 'a';
121 }
122
123 /*
124 * check the target directory; if you have six X's and it
125 * doesn't exist this runs for a *very* long time.
126 */
127 for (start = trv + 1;; --trv) {
128 if (trv <= path)
129 break;
130 if (*trv == '/') {
131 *trv = '\0';
132 if (stat(path, &sbuf))
133 return (0);
134 if (!S_ISDIR(sbuf.st_mode)) {
135 errno = ENOTDIR;
136 return (0);
137 }
138 *trv = '/';
139 break;
140 }
141 }
142
143 for (;;) {
144 if (doopen) {
145 if ((*doopen =
146 open(path, O_CREAT | O_EXCL | O_RDWR, 0600)) >= 0)
147 return (1);
148 if (errno != EEXIST)
149 return (0);
150 } else if (domkdir) {
151 if (mkdir(path, 0700) >= 0)
152 return (1);
153 if (errno != EEXIST)
154 return (0);
155 } else if (lstat(path, &sbuf))
156 return (errno == ENOENT ? 1 : 0);
157
158 /* tricky little algorithm for backward compatibility */
159 for (trv = start;;) {
160 if (!*trv)
161 return (0);
162 if (*trv == 'z') {
163 *trv++ = 'a';
164 }
165 else {
166 if (isdigit((unsigned char)*trv))
167 *trv = 'a';
168 else
169 ++*trv;
170 break;
171 }
172 }
173 }
174 /*NOTREACHED*/
175 }
176
177 #endif /* !HAVE_NBTOOL_CONFIG_H || !HAVE_MKSTEMP || !HAVE_MKDTEMP */
178