diff options
author | Paul Eggert <eggert@cs.ucla.edu> | 2011-02-22 11:30:07 -0800 |
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committer | Paul Eggert <eggert@cs.ucla.edu> | 2011-02-22 11:30:07 -0800 |
commit | ae0d725005539d9259efac6a81ff8fdd45eb69a6 (patch) | |
tree | c721b530409b355281537abc7b058bdb2697ee01 /lib/stat.c | |
parent | 8d40723d1e9661840a67ca7be9c5b073526ab421 (diff) |
[ChangeLog]
Work around some portability problems with symlinks.
* Makefile.in (GNULIB_MODULES): Add lstat, readlink, symlink.
* configure.in (lstat, HAVE_LSTAT): Remove special hack.
* lib/lstat.c, lib/readlink.c, lib/stat.c, lib/symlink.c:
* m4/dos.m4, m4/lstat.m4, m4/readlink.m4, m4/stat.m4, m4/symlink.m4:
New files, automatically generated from gnulib.
* aclocal.m4, configure, lib/Makefile.in, lib/gnulib.mk:
* lib/stdlib.in.h, m4/gl-comp.m4, m4/stdlib_h.m4: Regenerate.
2011-02-22 Paul Eggert <eggert@cs.ucla.edu>
[src/ChangeLog]
Work around some portability problems with symlinks.
* fileio.c (Frename_file, Fmake_symbolic_link, Ffile_symlink_p):
Simplify the code by assuming that the readlink and symlink calls
exist, even if they always fail on this host.
(Ffile_readable_p): Likewise, for fifos.
* config.in: Regenerate.
Diffstat (limited to 'lib/stat.c')
-rw-r--r-- | lib/stat.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/lib/stat.c b/lib/stat.c new file mode 100644 index 0000000000..f16d9144af --- /dev/null +++ b/lib/stat.c @@ -0,0 +1,104 @@ +/* Work around platform bugs in stat. + Copyright (C) 2009-2011 Free Software Foundation, Inc. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. */ + +/* written by Eric Blake */ + +#include <config.h> + +/* Get the original definition of stat. It might be defined as a macro. */ +#define __need_system_sys_stat_h +#include <sys/types.h> +#include <sys/stat.h> +#undef __need_system_sys_stat_h + +static inline int +orig_stat (const char *filename, struct stat *buf) +{ + return stat (filename, buf); +} + +/* Specification. */ +#include <sys/stat.h> + +#include <errno.h> +#include <limits.h> +#include <stdbool.h> +#include <string.h> + +/* Store information about NAME into ST. Work around bugs with + trailing slashes. Mingw has other bugs (such as st_ino always + being 0 on success) which this wrapper does not work around. But + at least this implementation provides the ability to emulate fchdir + correctly. */ + +int +rpl_stat (char const *name, struct stat *st) +{ + int result = orig_stat (name, st); +#if REPLACE_FUNC_STAT_FILE + /* Solaris 9 mistakenly succeeds when given a non-directory with a + trailing slash. */ + if (result == 0 && !S_ISDIR (st->st_mode)) + { + size_t len = strlen (name); + if (ISSLASH (name[len - 1])) + { + errno = ENOTDIR; + return -1; + } + } +#endif /* REPLACE_FUNC_STAT_FILE */ +#if REPLACE_FUNC_STAT_DIR + if (result == -1 && errno == ENOENT) + { + /* Due to mingw's oddities, there are some directories (like + c:\) where stat() only succeeds with a trailing slash, and + other directories (like c:\windows) where stat() only + succeeds without a trailing slash. But we want the two to be + synonymous, since chdir() manages either style. Likewise, Mingw also + reports ENOENT for names longer than PATH_MAX, when we want + ENAMETOOLONG, and for stat("file/"), when we want ENOTDIR. + Fortunately, mingw PATH_MAX is small enough for stack + allocation. */ + char fixed_name[PATH_MAX + 1] = {0}; + size_t len = strlen (name); + bool check_dir = false; + if (PATH_MAX <= len) + errno = ENAMETOOLONG; + else if (len) + { + strcpy (fixed_name, name); + if (ISSLASH (fixed_name[len - 1])) + { + check_dir = true; + while (len && ISSLASH (fixed_name[len - 1])) + fixed_name[--len] = '\0'; + if (!len) + fixed_name[0] = '/'; + } + else + fixed_name[len++] = '/'; + result = orig_stat (fixed_name, st); + if (result == 0 && check_dir && !S_ISDIR (st->st_mode)) + { + result = -1; + errno = ENOTDIR; + } + } + } +#endif /* REPLACE_FUNC_STAT_DIR */ + return result; +} |