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ae0d7250 PE |
1 | /* Work around platform bugs in stat. |
2 | Copyright (C) 2009-2011 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 | #include <config.h> | |
20 | ||
21 | /* Get the original definition of stat. It might be defined as a macro. */ | |
22 | #define __need_system_sys_stat_h | |
23 | #include <sys/types.h> | |
24 | #include <sys/stat.h> | |
25 | #undef __need_system_sys_stat_h | |
26 | ||
27 | static inline int | |
28 | orig_stat (const char *filename, struct stat *buf) | |
29 | { | |
30 | return stat (filename, buf); | |
31 | } | |
32 | ||
33 | /* Specification. */ | |
34 | #include <sys/stat.h> | |
35 | ||
36 | #include <errno.h> | |
37 | #include <limits.h> | |
38 | #include <stdbool.h> | |
39 | #include <string.h> | |
36f13e16 | 40 | #include "dosname.h" |
6dd7e400 | 41 | #include "verify.h" |
ae0d7250 PE |
42 | |
43 | /* Store information about NAME into ST. Work around bugs with | |
44 | trailing slashes. Mingw has other bugs (such as st_ino always | |
45 | being 0 on success) which this wrapper does not work around. But | |
46 | at least this implementation provides the ability to emulate fchdir | |
47 | correctly. */ | |
48 | ||
49 | int | |
50 | rpl_stat (char const *name, struct stat *st) | |
51 | { | |
52 | int result = orig_stat (name, st); | |
53 | #if REPLACE_FUNC_STAT_FILE | |
54 | /* Solaris 9 mistakenly succeeds when given a non-directory with a | |
55 | trailing slash. */ | |
56 | if (result == 0 && !S_ISDIR (st->st_mode)) | |
57 | { | |
58 | size_t len = strlen (name); | |
59 | if (ISSLASH (name[len - 1])) | |
60 | { | |
61 | errno = ENOTDIR; | |
62 | return -1; | |
63 | } | |
64 | } | |
65 | #endif /* REPLACE_FUNC_STAT_FILE */ | |
66 | #if REPLACE_FUNC_STAT_DIR | |
6dd7e400 PE |
67 | /* The only known systems where REPLACE_FUNC_STAT_DIR is needed also |
68 | have a constant PATH_MAX. */ | |
69 | # ifndef PATH_MAX | |
70 | # error "Please port this replacement to your platform" | |
71 | # endif | |
72 | ||
ae0d7250 PE |
73 | if (result == -1 && errno == ENOENT) |
74 | { | |
75 | /* Due to mingw's oddities, there are some directories (like | |
76 | c:\) where stat() only succeeds with a trailing slash, and | |
77 | other directories (like c:\windows) where stat() only | |
78 | succeeds without a trailing slash. But we want the two to be | |
79 | synonymous, since chdir() manages either style. Likewise, Mingw also | |
80 | reports ENOENT for names longer than PATH_MAX, when we want | |
81 | ENAMETOOLONG, and for stat("file/"), when we want ENOTDIR. | |
82 | Fortunately, mingw PATH_MAX is small enough for stack | |
83 | allocation. */ | |
84 | char fixed_name[PATH_MAX + 1] = {0}; | |
85 | size_t len = strlen (name); | |
86 | bool check_dir = false; | |
6dd7e400 | 87 | verify (PATH_MAX <= 4096); |
ae0d7250 PE |
88 | if (PATH_MAX <= len) |
89 | errno = ENAMETOOLONG; | |
90 | else if (len) | |
91 | { | |
92 | strcpy (fixed_name, name); | |
93 | if (ISSLASH (fixed_name[len - 1])) | |
94 | { | |
95 | check_dir = true; | |
96 | while (len && ISSLASH (fixed_name[len - 1])) | |
97 | fixed_name[--len] = '\0'; | |
98 | if (!len) | |
99 | fixed_name[0] = '/'; | |
100 | } | |
101 | else | |
102 | fixed_name[len++] = '/'; | |
103 | result = orig_stat (fixed_name, st); | |
104 | if (result == 0 && check_dir && !S_ISDIR (st->st_mode)) | |
105 | { | |
106 | result = -1; | |
107 | errno = ENOTDIR; | |
108 | } | |
109 | } | |
110 | } | |
111 | #endif /* REPLACE_FUNC_STAT_DIR */ | |
112 | return result; | |
113 | } |