X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstring%2Fmemmove.c;h=7c50deeb6ead1e8d0c1cac5a3e2e3e793d7b6931;hb=2f57d79a5a24856fdea69b2119d67e5fb5029b3e;hp=ba73742ce0fda71718d004ee5d0228140b8a8be6;hpb=0a5395faab237ba9008352b0f4bee9659bbd3d5f;p=pdclib

diff --git a/functions/string/memmove.c b/functions/string/memmove.c
index ba73742..7c50dee 100644
--- a/functions/string/memmove.c
+++ b/functions/string/memmove.c
@@ -1,38 +1,51 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
+/* $Id$ */
 
-void * memmove( void * s1, const void * s2, size_t n ) { /* TODO */ };
+/* Release $Name$ */
 
-/* PDPC code - unreviewed
+/* 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 *p = s1;
-    const char *cs2 = s2;
-    size_t x;
-    
-    if (p <= cs2)
+    char * dest = (char *) s1;
+    const char * src = (const char *) s2;
+    if ( dest <= src )
     {
-        for (x=0; x < n; x++)
+        while ( n-- )
         {
-            *p = *cs2;
-            p++;
-            cs2++;
+            *dest++ = *src++;
         }
     }
     else
     {
-        if (n != 0)
+        src += n;
+        dest += n;
+        while ( n-- )
         {
-            for (x=n-1; x > 0; x--)
-            {
-                *(p+x) = *(cs2+x);
-            }
+            *--dest = *--src;
         }
-        *(p+x) = *(cs2+x);
     }
-    return (s1);
+    return s1;
+}
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main()
+{
+    char s[] = "xxxxabcde";
+    BEGIN_TESTS;
+    TESTCASE( memmove( s, s + 4, 5 ) == s );
+    TESTCASE( s[0] == 'a' );
+    TESTCASE( s[4] == 'e' );
+    TESTCASE( s[5] == 'b' );
+    TESTCASE( memmove( s + 4, s, 5 ) == s + 4 );
+    TESTCASE( s[4] == 'a' );
+    return TEST_RESULTS;
 }
-*/
\ No newline at end of file
+#endif