Branch data 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 : 1 : pg_mkdir_p(char *path, int omode)
58 : : {
59 : 1 : struct stat sb;
60 : 1 : mode_t numask,
61 : : oumask;
62 : 1 : int last,
63 : : retval;
64 : 1 : char *p;
65 : :
66 : 1 : retval = 0;
67 : 1 : 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 : 1 : oumask = umask(0);
104 : 1 : numask = oumask & ~(S_IWUSR | S_IXUSR);
105 : 1 : (void) umask(numask);
106 : :
107 [ - + ]: 1 : if (p[0] == '/') /* Skip leading '/'. */
108 : 1 : ++p;
109 [ + + ]: 53 : for (last = 0; !last; ++p)
110 : : {
111 [ + + ]: 52 : if (p[0] == '\0')
112 : 1 : last = 1;
113 [ + + ]: 51 : else if (p[0] != '/')
114 : 47 : continue;
115 : 5 : *p = '\0';
116 [ + + - + ]: 5 : if (!last && p[1] == '\0')
117 : 0 : last = 1;
118 : :
119 [ + + ]: 5 : if (last)
120 : 1 : (void) umask(oumask);
121 : :
122 : : /* check for pre-existing directory */
123 [ + + ]: 5 : if (stat(path, &sb) == 0)
124 : : {
125 [ + - ]: 4 : 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 : 4 : }
135 [ + - + - ]: 1 : else if (mkdir(path, last ? omode : S_IRWXU | S_IRWXG | S_IRWXO) < 0)
136 : : {
137 : 0 : retval = -1;
138 : 0 : break;
139 : : }
140 [ + + ]: 5 : if (!last)
141 : 4 : *p = '/';
142 : 5 : }
143 : :
144 : : /* ensure we restored umask */
145 : 1 : (void) umask(oumask);
146 : :
147 : 2 : return retval;
148 : 1 : }
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