Line data Source code
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
57 534 : 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 :
66 534 : retval = 0;
67 534 : 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 = strchr(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 : */
103 534 : oumask = umask(0);
104 534 : numask = oumask & ~(S_IWUSR | S_IXUSR);
105 534 : (void) umask(numask);
106 :
107 534 : if (p[0] == '/') /* Skip leading '/'. */
108 534 : ++p;
109 60283 : for (last = 0; !last; ++p)
110 : {
111 59749 : if (p[0] == '\0')
112 534 : last = 1;
113 59215 : else if (p[0] != '/')
114 53426 : continue;
115 6323 : *p = '\0';
116 6323 : if (!last && p[1] == '\0')
117 0 : last = 1;
118 :
119 6323 : if (last)
120 534 : (void) umask(oumask);
121 :
122 : /* check for pre-existing directory */
123 6323 : if (stat(path, &sb) == 0)
124 : {
125 5650 : if (!S_ISDIR(sb.st_mode))
126 : {
127 0 : if (last)
128 0 : errno = EEXIST;
129 : else
130 0 : errno = ENOTDIR;
131 0 : retval = -1;
132 0 : break;
133 : }
134 : }
135 673 : else if (mkdir(path, last ? omode : S_IRWXU | S_IRWXG | S_IRWXO) < 0)
136 : {
137 0 : retval = -1;
138 0 : break;
139 : }
140 6323 : if (!last)
141 5789 : *p = '/';
142 : }
143 :
144 : /* ensure we restored umask */
145 534 : (void) umask(oumask);
146 :
147 534 : return retval;
148 : }
|
