-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-void * memcpy( void * restrict s1, const void * restrict s2, size_t n ) { /* TODO */ };
+/* $Id$ */
+
+/* memcpy( 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>
+
+#ifndef REGTEST
+
+void * memcpy( void * _PDCLIB_restrict s1, const void * _PDCLIB_restrict s2, size_t n )
+{
+ char * dest = (char *) s1;
+ const char * src = (const char *) s2;
+ while ( n-- )
+ {
+ *dest++ = *src++;
+ }
+ return s1;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+ char s[] = "xxxxxxxxxxx";
+ TESTCASE( memcpy( s, abcde, 6 ) == s );
+ TESTCASE( s[4] == 'e' );
+ TESTCASE( s[5] == '\0' );
+ TESTCASE( memcpy( s + 5, abcde, 5 ) == s + 5 );
+ TESTCASE( s[9] == 'e' );
+ TESTCASE( s[10] == 'x' );
+ return TEST_RESULTS;
+}
+#endif