| 1 | /* Work around platform bugs in stat. |
| 2 | Copyright (C) 2009-2014 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 | } |