X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstring%2Fmemcmp.c;h=d873c07d140eb1ee781369ac84fb52bbe37d823f;hb=41afb7a0762978ee57d1a8d6223e82e73f2acb9b;hp=43b7e585f348f3d112ef817009b94e38d97758ac;hpb=dcc8a8e99f69e090a03b7b868443addbc0817820;p=pdclib.old

diff --git a/functions/string/memcmp.c b/functions/string/memcmp.c
index 43b7e58..d873c07 100644
--- a/functions/string/memcmp.c
+++ b/functions/string/memcmp.c
@@ -1,8 +1,27 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-int memcmp( const void * s1, const void * s2, size_t n ) { /* TODO */ };
+/* $Id$ */
+
+/* Release $Name$ */
+
+/* memcmp( const 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>
+
+int memcmp( const void * s1, const void * s2, size_t n )
+{
+    const unsigned char * p1 = (const unsigned char *) s1;
+    const unsigned char * p2 = (const unsigned char *) s2;
+    while ( n-- )
+    {
+        if ( *p1 != *p2 )
+        {
+            return *p2 - *p1;
+        }
+        ++p1;
+        ++p2;
+    }
+    return 0;
+}