Merge commit 'upstream/3.1.0'

[debian/amanda] / gnulib / lstat.c

diff --git a/gnulib/lstat.c b/gnulib/lstat.c
new file mode 100644 (file)
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--- /dev/null
+++ b/gnulib/lstat.c
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+/* Work around a bug of lstat on some systems
+
+   Copyright (C) 1997-1999, 2000-2006, 2008 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 Jim Meyering */
+
+#include <config.h>
+
+/* Get the original definition of open.  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_lstat (const char *filename, struct stat *buf)
+{
+  return lstat (filename, buf);
+}
+
+/* Specification.  */
+#include <sys/stat.h>
+
+#include <string.h>
+#include <errno.h>
+
+/* lstat works differently on Linux and Solaris systems.  POSIX (see
+   `pathname resolution' in the glossary) requires that programs like
+   `ls' take into consideration the fact that FILE has a trailing slash
+   when FILE is a symbolic link.  On Linux and Solaris 10 systems, the
+   lstat function already has the desired semantics (in treating
+   `lstat ("symlink/", sbuf)' just like `lstat ("symlink/.", sbuf)',
+   but on Solaris 9 and earlier it does not.
+
+   If FILE has a trailing slash and specifies a symbolic link,
+   then use stat() to get more info on the referent of FILE.
+   If the referent is a non-directory, then set errno to ENOTDIR
+   and return -1.  Otherwise, return stat's result.  */
+
+int
+rpl_lstat (const char *file, struct stat *sbuf)
+{
+  size_t len;
+  int lstat_result = orig_lstat (file, sbuf);
+
+  if (lstat_result != 0 || !S_ISLNK (sbuf->st_mode))
+    return lstat_result;
+
+  len = strlen (file);
+  if (len == 0 || file[len - 1] != '/')
+    return 0;
+
+  /* FILE refers to a symbolic link and the name ends with a slash.
+     Call stat() to get info about the link's referent.  */
+
+  /* If stat fails, then we do the same.  */
+  if (stat (file, sbuf) != 0)
+    return -1;
+
+  /* If FILE references a directory, return 0.  */
+  if (S_ISDIR (sbuf->st_mode))
+    return 0;
+
+  /* Here, we know stat succeeded and FILE references a non-directory.
+     But it was specified via a name including a trailing slash.
+     Fail with errno set to ENOTDIR to indicate the contradiction.  */
+  errno = ENOTDIR;
+  return -1;
+}