Re-import from Subversion.

[pdclib] / functions / string / memcmp.c

diff --git a/functions/string/memcmp.c b/functions/string/memcmp.c
index 43b7e585f348f3d112ef817009b94e38d97758ac..8491ef72c7155bf361d1ac6412c75e8434ca2a32 100644 (file)
--- a/functions/string/memcmp.c
+++ b/functions/string/memcmp.c
@@ -1,8 +1,24 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
+/* ----------------------------------------------------------------------------
+ * $Id$
+ * ----------------------------------------------------------------------------
+ * 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 */ };
+#include <__size_t.h>
+
+int memcmp( const void * src_1, const void * src_2, size_t n )
+{
+    const unsigned char * p1 = (const unsigned char *) src_1;
+    const unsigned char * p2 = (const unsigned char *) src_2;
+    while ( n-- )
+    {
+        if ( *p1 != *p2 )
+        {
+            return *p2 - *p1;
+        }
+        ++p1;
+        ++p2;
+    }
+    return 0;
+}