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1dea5535b0
* gnulib/lib/lstat.c: Include <sys/stat.h> *before* the use of stat in orig_stat. Otherwise, on mingw (which lacks lstat), any program using the lstat module would not get the redefinition-to-stat provided by gnulib's sys/stat.h. Reported by Daniel P. Berrange.
83 lines
2.7 KiB
C
83 lines
2.7 KiB
C
/* Work around a bug of lstat on some systems
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Copyright (C) 1997-1999, 2000-2006, 2008 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 Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser 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 Jim Meyering */
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#include <config.h>
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/* Get the original definition of open. It might be defined as a macro. */
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#define __need_system_sys_stat_h
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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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/* Specification. */
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#include <sys/stat.h>
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static inline int
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orig_lstat (const char *filename, struct stat *buf)
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{
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return lstat (filename, buf);
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}
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#include <string.h>
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#include <errno.h>
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/* lstat works differently on Linux and Solaris systems. POSIX (see
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`pathname resolution' in the glossary) requires that programs like
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`ls' take into consideration the fact that FILE has a trailing slash
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when FILE is a symbolic link. On Linux and Solaris 10 systems, the
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lstat function already has the desired semantics (in treating
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`lstat ("symlink/", sbuf)' just like `lstat ("symlink/.", sbuf)',
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but on Solaris 9 and earlier it does not.
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If FILE has a trailing slash and specifies a symbolic link,
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then use stat() to get more info on the referent of FILE.
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If the referent is a non-directory, then set errno to ENOTDIR
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and return -1. Otherwise, return stat's result. */
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int
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rpl_lstat (const char *file, struct stat *sbuf)
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{
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size_t len;
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int lstat_result = orig_lstat (file, sbuf);
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if (lstat_result != 0 || !S_ISLNK (sbuf->st_mode))
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return lstat_result;
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len = strlen (file);
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if (len == 0 || file[len - 1] != '/')
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return 0;
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/* FILE refers to a symbolic link and the name ends with a slash.
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Call stat() to get info about the link's referent. */
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/* If stat fails, then we do the same. */
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if (stat (file, sbuf) != 0)
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return -1;
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/* If FILE references a directory, return 0. */
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if (S_ISDIR (sbuf->st_mode))
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return 0;
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/* Here, we know stat succeeded and FILE references a non-directory.
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But it was specified via a name including a trailing slash.
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Fail with errno set to ENOTDIR to indicate the contradiction. */
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errno = ENOTDIR;
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return -1;
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}
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