maint: update copyright

[gnulib.git] / lib / dirname.c

diff --git a/lib/dirname.c b/lib/dirname.c
index e3c762c..94f1a36 100644 (file)
--- a/lib/dirname.c
+++ b/lib/dirname.c
@@ -1,12 +1,12 @@
 /* dirname.c -- return all but the last element in a file name
 
-   Copyright (C) 1990, 1998, 2000, 2001, 2003, 2004, 2005, 2006 Free Software
+   Copyright (C) 1990, 1998, 2000-2001, 2003-2006, 2009-2014 Free Software
    Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
+   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 2, or (at your option)
-   any later version.
+   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
@@ -14,74 +14,25 @@
    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, write to the Free Software Foundation,
-   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
 
 #include "dirname.h"
 
+#include <stdlib.h>
 #include <string.h>
 #include "xalloc.h"
 
-/* Return the length of the prefix of FILE that will be used by
-   dir_name.  If FILE is in the working directory, this returns zero
-   even though `dir_name (FILE)' will return ".".  Works properly even
-   if there are trailing slashes (by effectively ignoring them).  */
-
-size_t
-dir_len (char const *file)
-{
-  size_t prefix_length = FILE_SYSTEM_PREFIX_LEN (file);
-  size_t length;
-
-  /* Advance prefix_length beyond important leading slashes.  */
-  prefix_length += (prefix_length != 0
-                   ? (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
-                      && ISSLASH (file[prefix_length]))
-                   : (ISSLASH (file[0])
-                      ? ((DOUBLE_SLASH_IS_DISTINCT_ROOT
-                          && ISSLASH (file[1]) && ! ISSLASH (file[2])
-                          ? 2 : 1))
-                      : 0));
-
-  /* Strip the basename and any redundant slashes before it.  */
-  for (length = last_component (file) - file;
-       prefix_length < length; length--)
-    if (! ISSLASH (file[length - 1]))
-      break;
-  return length;
-}
-
-
-/* In general, we can't use the builtin `dirname' function if available,
-   since it has different meanings in different environments.
-   In some environments the builtin `dirname' modifies its argument.
-
-   Return the leading directories part of FILE, allocated with xmalloc.
-   Works properly even if there are trailing slashes (by effectively
-   ignoring them).  Unlike POSIX dirname(), FILE cannot be NULL.
-
-   If lstat (FILE) would succeed, then { chdir (dir_name (FILE));
-   lstat (base_name (FILE)); } will access the same file.  Likewise,
-   if the sequence { chdir (dir_name (FILE));
-   rename (base_name (FILE), "foo"); } succeeds, you have renamed FILE
-   to "foo" in the same directory FILE was in.  */
+/* Just like mdir_name (dirname-lgpl.c), except, rather than
+   returning NULL upon malloc failure, here, we report the
+   "memory exhausted" condition and exit.  */
 
 char *
 dir_name (char const *file)
 {
-  size_t length = dir_len (file);
-  bool append_dot = (length == 0
-                    || (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
-                        && length == FILE_SYSTEM_PREFIX_LEN (file)
-                        && file[2] != '\0' && ! ISSLASH (file[2])));
-  char *dir = xmalloc (length + append_dot + 1);
-  memcpy (dir, file, length);
-  if (append_dot)
-    dir[length++] = '.';
-  dir[length] = '\0';
-  return dir;
+  char *result = mdir_name (file);
+  if (!result)
+    xalloc_die ();
+  return result;
 }