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b88d20f978
failure on deficient systems, and simplify gnulib lgpl dependencies. (rpl_lstat): Rewrite to use stat() in place of the xmalloc/lstat combination. Based on a patch from Bruno Haible.
81 lines
2.7 KiB
C
81 lines
2.7 KiB
C
/* Work around a bug of lstat on some systems
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Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free
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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 2, or (at your option)
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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, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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/* written by Jim Meyering */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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/* The specification of these functions is in sys_stat.h. But we cannot
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include this include file here, because on some systems, a
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"#define lstat lstat64" is being used, and sys_stat.h deletes this
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definition. */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <string.h>
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#include <errno.h>
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#include "stat-macros.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 = 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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