-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-void * memmove( void * s1, const void * s2, size_t n ) { /* TODO */ };
+/* $Id$ */
+
+/* Release $Name$ */
+
+/* memmove( void *, const void *, size_t )
+
+ 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>
+
+void * memmove( void * s1, const void * s2, size_t n )
+{
+ char * dest = (char *) s1;
+ const char * src = (const char *) s2;
+ if ( dest < src )
+ {
+ while ( n-- )
+ {
+ *dest++ = *src++;
+ }
+ }
+ else
+ {
+ src += n;
+ dest += n;
+ while ( n-- )
+ {
+ *dest-- = *src--;
+ }
+ }
+ return s1;
+}
+
+#warning Test driver missing.
+
+#ifdef TEST
+int main()
+{
+ return 0;
+}
+#endif