Virgin import of diffutils 2.8.7.

1 files changed, 119 insertions, 0 deletions

diff --git a/contrib/diff/lib/dirname.c b/contrib/diff/lib/dirname.c
new file mode 100644
index 0000000..815192a
--- /dev/null
+++ b/contrib/diff/lib/dirname.c
@@ -0,0 +1,119 @@
+/* dirname.c -- return all but the last element in a path
+   Copyright (C) 1990, 1998, 2000, 2001, 2003 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 2, 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, write to the Free Software Foundation,
+   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "dirname.h"
+
+#include <string.h>
+#include "xalloc.h"
+
+/* Return the length of `dirname (PATH)', or zero if PATH is
+   in the working directory.  Works properly even if
+   there are trailing slashes (by effectively ignoring them).  */
+size_t
+dir_len (char const *path)
+{
+  size_t prefix_length = FILESYSTEM_PREFIX_LEN (path);
+  size_t length;
+
+  /* Strip the basename and any redundant slashes before it.  */
+  for (length = base_name (path) - path;  prefix_length < length;  length--)
+    if (! ISSLASH (path[length - 1]))
+      return length;
+
+  /* But don't strip the only slash from "/".  */
+  return prefix_length + ISSLASH (path[prefix_length]);
+}
+
+/* Return the leading directories part of PATH,
+   allocated with xmalloc.
+   Works properly even if there are trailing slashes
+   (by effectively ignoring them).  */
+
+char *
+dir_name (char const *path)
+{
+  size_t length = dir_len (path);
+  int append_dot = (length == FILESYSTEM_PREFIX_LEN (path));
+  char *newpath = xmalloc (length + append_dot + 1);
+  memcpy (newpath, path, length);
+  if (append_dot)
+    newpath[length++] = '.';
+  newpath[length] = 0;
+  return newpath;
+}
+
+#ifdef TEST_DIRNAME
+/*
+
+Run the test like this (expect no output):
+  gcc -DHAVE_CONFIG_H -DTEST_DIRNAME -I.. -O -Wall \
+     basename.c dirname.c xmalloc.c error.c
+  sed -n '/^BEGIN-DATA$/,/^END-DATA$/p' dirname.c|grep -v DATA|./a.out
+
+If it's been built on a DOS or Windows platforms, run another test like
+this (again, expect no output):
+  sed -n '/^BEGIN-DOS-DATA$/,/^END-DOS-DATA$/p' dirname.c|grep -v DATA|./a.out
+
+BEGIN-DATA
+foo//// .
+bar/foo//// bar
+foo/ .
+/ /
+. .
+a .
+END-DATA
+
+BEGIN-DOS-DATA
+c:///// c:/
+c:/ c:/
+c:/. c:/
+c:foo c:.
+c:foo/bar c:foo
+END-DOS-DATA
+
+*/
+
+# define MAX_BUFF_LEN 1024
+# include <stdio.h>
+
+char *program_name;
+
+int
+main (int argc, char *argv[])
+{
+  char buff[MAX_BUFF_LEN + 1];
+
+  program_name = argv[0];
+
+  buff[MAX_BUFF_LEN] = 0;
+  while (fgets (buff, MAX_BUFF_LEN, stdin) && buff[0])
+    {
+      char path[MAX_BUFF_LEN];
+      char expected_result[MAX_BUFF_LEN];
+      char const *result;
+      sscanf (buff, "%s %s", path, expected_result);
+      result = dir_name (path);
+      if (strcmp (result, expected_result))
+	printf ("%s: got %s, expected %s\n", path, result, expected_result);
+    }
+  return 0;
+}
+#endif