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2196f55f YQ |
1 | /* Work around platform bugs in stat. |
2 | Copyright (C) 2009-2012 Free Software Foundation, Inc. | |
3 | ||
4 | This program is free software: you can redistribute it and/or modify | |
5 | it under the terms of the GNU General Public License as published by | |
6 | the Free Software Foundation; either version 3 of the License, or | |
7 | (at your option) any later version. | |
8 | ||
9 | This program is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | GNU General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU General Public License | |
15 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
16 | ||
17 | /* written by Eric Blake */ | |
18 | ||
19 | /* If the user's config.h happens to include <sys/stat.h>, let it include only | |
20 | the system's <sys/stat.h> here, so that orig_stat doesn't recurse to | |
21 | rpl_stat. */ | |
22 | #define __need_system_sys_stat_h | |
23 | #include <config.h> | |
24 | ||
25 | /* Get the original definition of stat. It might be defined as a macro. */ | |
26 | #include <sys/types.h> | |
27 | #include <sys/stat.h> | |
28 | #undef __need_system_sys_stat_h | |
29 | ||
30 | #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ | |
31 | # if _GL_WINDOWS_64_BIT_ST_SIZE | |
32 | # undef stat /* avoid warning on mingw64 with _FILE_OFFSET_BITS=64 */ | |
33 | # define stat _stati64 | |
34 | # define REPLACE_FUNC_STAT_DIR 1 | |
35 | # undef REPLACE_FUNC_STAT_FILE | |
36 | # elif REPLACE_FUNC_STAT_FILE | |
37 | /* mingw64 has a broken stat() function, based on _stat(), in libmingwex.a. | |
38 | Bypass it. */ | |
39 | # define stat _stat | |
40 | # define REPLACE_FUNC_STAT_DIR 1 | |
41 | # undef REPLACE_FUNC_STAT_FILE | |
42 | # endif | |
43 | #endif | |
44 | ||
45 | static int | |
46 | orig_stat (const char *filename, struct stat *buf) | |
47 | { | |
48 | return stat (filename, buf); | |
49 | } | |
50 | ||
51 | /* Specification. */ | |
52 | /* Write "sys/stat.h" here, not <sys/stat.h>, otherwise OSF/1 5.1 DTK cc | |
53 | eliminates this include because of the preliminary #include <sys/stat.h> | |
54 | above. */ | |
55 | #include "sys/stat.h" | |
56 | ||
57 | #include <errno.h> | |
58 | #include <limits.h> | |
59 | #include <stdbool.h> | |
60 | #include <string.h> | |
61 | #include "dosname.h" | |
62 | #include "verify.h" | |
63 | ||
64 | #if REPLACE_FUNC_STAT_DIR | |
65 | # include "pathmax.h" | |
66 | /* The only known systems where REPLACE_FUNC_STAT_DIR is needed also | |
67 | have a constant PATH_MAX. */ | |
68 | # ifndef PATH_MAX | |
69 | # error "Please port this replacement to your platform" | |
70 | # endif | |
71 | #endif | |
72 | ||
73 | /* Store information about NAME into ST. Work around bugs with | |
74 | trailing slashes. Mingw has other bugs (such as st_ino always | |
75 | being 0 on success) which this wrapper does not work around. But | |
76 | at least this implementation provides the ability to emulate fchdir | |
77 | correctly. */ | |
78 | ||
79 | int | |
80 | rpl_stat (char const *name, struct stat *st) | |
81 | { | |
82 | int result = orig_stat (name, st); | |
83 | #if REPLACE_FUNC_STAT_FILE | |
84 | /* Solaris 9 mistakenly succeeds when given a non-directory with a | |
85 | trailing slash. */ | |
86 | if (result == 0 && !S_ISDIR (st->st_mode)) | |
87 | { | |
88 | size_t len = strlen (name); | |
89 | if (ISSLASH (name[len - 1])) | |
90 | { | |
91 | errno = ENOTDIR; | |
92 | return -1; | |
93 | } | |
94 | } | |
95 | #endif /* REPLACE_FUNC_STAT_FILE */ | |
96 | #if REPLACE_FUNC_STAT_DIR | |
97 | ||
98 | if (result == -1 && errno == ENOENT) | |
99 | { | |
100 | /* Due to mingw's oddities, there are some directories (like | |
101 | c:\) where stat() only succeeds with a trailing slash, and | |
102 | other directories (like c:\windows) where stat() only | |
103 | succeeds without a trailing slash. But we want the two to be | |
104 | synonymous, since chdir() manages either style. Likewise, Mingw also | |
105 | reports ENOENT for names longer than PATH_MAX, when we want | |
106 | ENAMETOOLONG, and for stat("file/"), when we want ENOTDIR. | |
107 | Fortunately, mingw PATH_MAX is small enough for stack | |
108 | allocation. */ | |
109 | char fixed_name[PATH_MAX + 1] = {0}; | |
110 | size_t len = strlen (name); | |
111 | bool check_dir = false; | |
112 | verify (PATH_MAX <= 4096); | |
113 | if (PATH_MAX <= len) | |
114 | errno = ENAMETOOLONG; | |
115 | else if (len) | |
116 | { | |
117 | strcpy (fixed_name, name); | |
118 | if (ISSLASH (fixed_name[len - 1])) | |
119 | { | |
120 | check_dir = true; | |
121 | while (len && ISSLASH (fixed_name[len - 1])) | |
122 | fixed_name[--len] = '\0'; | |
123 | if (!len) | |
124 | fixed_name[0] = '/'; | |
125 | } | |
126 | else | |
127 | fixed_name[len++] = '/'; | |
128 | result = orig_stat (fixed_name, st); | |
129 | if (result == 0 && check_dir && !S_ISDIR (st->st_mode)) | |
130 | { | |
131 | result = -1; | |
132 | errno = ENOTDIR; | |
133 | } | |
134 | } | |
135 | } | |
136 | #endif /* REPLACE_FUNC_STAT_DIR */ | |
137 | return result; | |
138 | } |