1 files changed, 69 insertions, 0 deletions
diff --git a/stdlib/xpg_basename.c b/stdlib/xpg_basename.c
new file mode 100644
index 0000000000..b789bc9a1a
--- /dev/null
+++ b/stdlib/xpg_basename.c
@@ -0,0 +1,69 @@
+/* Return basename of given pathname according to the weird XPG specification.
+   Copyright (C) 1997 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <string.h>
+#include <libgen.h>
+
+
+char *
+__xpg_basename (char *filename)
+{
+  char *p;
+
+  if (filename == NULL || filename[0] == '\0')
+    /* We return a pointer to a static string containing ".".  */
+    p = (char *) ".";
+  else
+    {
+      p = strrchr (filename, '/');
+
+      if (p == NULL)
+	/* There is no slash in the filename.  Return the whole string.  */
+	p = filename;
+      else
+	{
+	  if (p[1] == '\0')
+	    {
+	      /* We must remove trailing '/'.  */
+	      while (p > filename && p[-1] == '/')
+		--p;
+
+	      /* Now we can be in two situations:
+		 a) the string only contains '/' characters, so we return
+		    '/'
+		 b) p points past the last component, but we have to remove
+		    the trailing slash.  */
+	      if (p > filename)
+		{
+		  *p-- = '\0';
+		  while (p > filename && p[-1] != '/')
+		    --p;
+		}
+	      else
+		/* The last slash we already found is the right position
+		   to return.  */
+		while (p[1] != '\0')
+		  ++p;
+	    }
+	}
+    }
+
+  return p;
+}