1 /*
2 * This is adapted from FreeBSD's src/bin/mkdir/mkdir.c, which bears
3 * the following copyright notice:
4 *
5 * Copyright (c) 1983, 1992, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include "c.h"
34
35 #include <sys/stat.h>
36
37
38 /*
39 * pg_mkdir_p --- create a directory and, if necessary, parent directories
40 *
41 * This is equivalent to "mkdir -p" except we don't complain if the target
42 * directory already exists.
43 *
44 * We assume the path is in canonical form, i.e., uses / as the separator.
45 *
46 * omode is the file permissions bits for the target directory. Note that any
47 * parent directories that have to be created get permissions according to the
48 * prevailing umask, but with u+wx forced on to ensure we can create there.
49 * (We declare omode as int, not mode_t, to minimize dependencies for port.h.)
50 *
51 * Returns 0 on success, -1 (with errno set) on failure.
52 *
53 * Note that on failure, the path arg has been modified to show the particular
54 * directory level we had problems with.
55 */
56 int
pg_mkdir_p(char * path,int omode)57 pg_mkdir_p(char *path, int omode)
58 {
59 struct stat sb;
60 mode_t numask,
61 oumask;
62 int last,
63 retval;
64 char *p;
65
66 retval = 0;
67 p = path;
68
69 #ifdef WIN32
70 /* skip network and drive specifiers for win32 */
71 if (strlen(p) >= 2)
72 {
73 if (p[0] == '/' && p[1] == '/')
74 {
75 /* network drive */
76 p = strstr(p + 2, "/");
77 if (p == NULL)
78 {
79 errno = EINVAL;
80 return -1;
81 }
82 }
83 else if (p[1] == ':' &&
84 ((p[0] >= 'a' && p[0] <= 'z') ||
85 (p[0] >= 'A' && p[0] <= 'Z')))
86 {
87 /* local drive */
88 p += 2;
89 }
90 }
91 #endif
92
93 /*
94 * POSIX 1003.2: For each dir operand that does not name an existing
95 * directory, effects equivalent to those caused by the following command
96 * shall occur:
97 *
98 * mkdir -p -m $(umask -S),u+wx $(dirname dir) && mkdir [-m mode] dir
99 *
100 * We change the user's umask and then restore it, instead of doing
101 * chmod's. Note we assume umask() can't change errno.
102 */
103 oumask = umask(0);
104 numask = oumask & ~(S_IWUSR | S_IXUSR);
105 (void) umask(numask);
106
107 if (p[0] == '/') /* Skip leading '/'. */
108 ++p;
109 for (last = 0; !last; ++p)
110 {
111 if (p[0] == '\0')
112 last = 1;
113 else if (p[0] != '/')
114 continue;
115 *p = '\0';
116 if (!last && p[1] == '\0')
117 last = 1;
118
119 if (last)
120 (void) umask(oumask);
121
122 /* check for pre-existing directory */
123 if (stat(path, &sb) == 0)
124 {
125 if (!S_ISDIR(sb.st_mode))
126 {
127 if (last)
128 errno = EEXIST;
129 else
130 errno = ENOTDIR;
131 retval = -1;
132 break;
133 }
134 }
135 else if (mkdir(path, last ? omode : S_IRWXU | S_IRWXG | S_IRWXO) < 0)
136 {
137 retval = -1;
138 break;
139 }
140 if (!last)
141 *p = '/';
142 }
143
144 /* ensure we restored umask */
145 (void) umask(oumask);
146
147 return retval;
148 }
149