-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-size_t strlen( const char * s ) { /* TODO */ };
+/* strlen( const char * )
+
+ This file is part of the Public Domain C Library (PDCLib).
+ Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <string.h>
+
+#ifndef REGTEST
+
+size_t strlen( const char * s )
+{
+ size_t rc = 0;
+ while ( s[rc] )
+ {
+ ++rc;
+ }
+ return rc;
+}
+
+#endif
+
+#ifdef TEST
+
+#include "_PDCLIB_test.h"
+
+int main( void )
+{
+ TESTCASE( strlen( abcde ) == 5 );
+ TESTCASE( strlen( "" ) == 0 );
+ return TEST_RESULTS;
+}
+
+#endif