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138 lines
4.4 KiB
138 lines
4.4 KiB
/* Work around platform bugs in stat. |
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Copyright (C) 2009-2017 Free Software Foundation, Inc. |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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/* written by Eric Blake */ |
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/* If the user's config.h happens to include <sys/stat.h>, let it include only |
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the system's <sys/stat.h> here, so that orig_stat doesn't recurse to |
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rpl_stat. */ |
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#define __need_system_sys_stat_h |
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#include <config.h> |
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/* Get the original definition of stat. It might be defined as a macro. */ |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#undef __need_system_sys_stat_h |
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#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ |
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# if _GL_WINDOWS_64_BIT_ST_SIZE |
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# undef stat /* avoid warning on mingw64 with _FILE_OFFSET_BITS=64 */ |
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# define stat _stati64 |
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# define REPLACE_FUNC_STAT_DIR 1 |
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# undef REPLACE_FUNC_STAT_FILE |
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# elif REPLACE_FUNC_STAT_FILE |
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/* mingw64 has a broken stat() function, based on _stat(), in libmingwex.a. |
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Bypass it. */ |
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# define stat _stat |
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# define REPLACE_FUNC_STAT_DIR 1 |
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# undef REPLACE_FUNC_STAT_FILE |
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# endif |
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#endif |
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static int |
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orig_stat (const char *filename, struct stat *buf) |
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{ |
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return stat (filename, buf); |
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} |
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/* Specification. */ |
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/* Write "sys/stat.h" here, not <sys/stat.h>, otherwise OSF/1 5.1 DTK cc |
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eliminates this include because of the preliminary #include <sys/stat.h> |
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above. */ |
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#include "sys/stat.h" |
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#include <errno.h> |
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#include <limits.h> |
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#include <stdbool.h> |
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#include <string.h> |
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#include "dosname.h" |
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#include "verify.h" |
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#if REPLACE_FUNC_STAT_DIR |
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# include "pathmax.h" |
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/* The only known systems where REPLACE_FUNC_STAT_DIR is needed also |
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have a constant PATH_MAX. */ |
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# ifndef PATH_MAX |
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# error "Please port this replacement to your platform" |
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# endif |
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#endif |
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/* Store information about NAME into ST. Work around bugs with |
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trailing slashes. Mingw has other bugs (such as st_ino always |
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being 0 on success) which this wrapper does not work around. But |
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at least this implementation provides the ability to emulate fchdir |
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correctly. */ |
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int |
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rpl_stat (char const *name, struct stat *st) |
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{ |
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int result = orig_stat (name, st); |
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#if REPLACE_FUNC_STAT_FILE |
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/* Solaris 9 mistakenly succeeds when given a non-directory with a |
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trailing slash. */ |
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if (result == 0 && !S_ISDIR (st->st_mode)) |
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{ |
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size_t len = strlen (name); |
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if (ISSLASH (name[len - 1])) |
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{ |
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errno = ENOTDIR; |
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return -1; |
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} |
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} |
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#endif /* REPLACE_FUNC_STAT_FILE */ |
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#if REPLACE_FUNC_STAT_DIR |
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if (result == -1 && errno == ENOENT) |
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{ |
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/* Due to mingw's oddities, there are some directories (like |
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c:\) where stat() only succeeds with a trailing slash, and |
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other directories (like c:\windows) where stat() only |
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succeeds without a trailing slash. But we want the two to be |
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synonymous, since chdir() manages either style. Likewise, Mingw also |
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reports ENOENT for names longer than PATH_MAX, when we want |
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ENAMETOOLONG, and for stat("file/"), when we want ENOTDIR. |
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Fortunately, mingw PATH_MAX is small enough for stack |
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allocation. */ |
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char fixed_name[PATH_MAX + 1] = {0}; |
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size_t len = strlen (name); |
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bool check_dir = false; |
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verify (PATH_MAX <= 4096); |
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if (PATH_MAX <= len) |
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errno = ENAMETOOLONG; |
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else if (len) |
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{ |
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strcpy (fixed_name, name); |
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if (ISSLASH (fixed_name[len - 1])) |
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{ |
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check_dir = true; |
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while (len && ISSLASH (fixed_name[len - 1])) |
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fixed_name[--len] = '\0'; |
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if (!len) |
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fixed_name[0] = '/'; |
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} |
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else |
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fixed_name[len++] = '/'; |
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result = orig_stat (fixed_name, st); |
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if (result == 0 && check_dir && !S_ISDIR (st->st_mode)) |
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{ |
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result = -1; |
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errno = ENOTDIR; |
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} |
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} |
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} |
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#endif /* REPLACE_FUNC_STAT_DIR */ |
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return result; |
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}
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