Add basename and dirname. Write memrchr.

 -Erik

1 files changed, 55 insertions, 0 deletions

diff --git a/libc/string/dirname.c b/libc/string/dirname.c
new file mode 100644
index 000000000..89fc31ed8
--- /dev/null
+++ b/libc/string/dirname.c
@@ -0,0 +1,55 @@
+/* dirname - return directory part of PATH.
+   Copyright (C) 1996, 2000 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
+
+   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.  */
+
+#define __USE_GNU
+#include <libgen.h>
+#include <string.h>
+
+
+char * dirname(char *path)
+{
+    static const char dot[] = ".";
+    char *last_slash;
+
+    /* Find last '/'.  */
+    last_slash = path != NULL ? strrchr (path, '/') : NULL;
+
+    if (last_slash != NULL && last_slash != path && last_slash[1] == '\0')
+	/* The '/' is the last character, we have to look further.  */
+	last_slash = memrchr (path, '/', last_slash - path);
+
+    if (last_slash != NULL)
+    {
+	/* Terminate the path.  */
+	if (last_slash == path)
+	    /* The last slash is the first character in the string.  We have to
+	       return "/".  */
+	    ++last_slash;
+
+	last_slash[0] = '\0';
+    }
+    else
+	/* This assignment is ill-designed but the XPG specs require to
+	   return a string containing "." in any case no directory part is
+	   found and so a static and constant string is required.  */
+	path = (char *) dot;
+
+    return path;
+}