Added further optimizations and unit tests.

test/val/lib_common_memmove.c

@@ -0,0 +1,61 @@
+#include <string.h>
+#include "unittest.h"
+
+#define BufferSize 384               // test correct page passing (>256, multiple of 128 here)
+
+static char Buffer[BufferSize+3];    // +1 to move up (and down)
+
+
+
+TEST
+{
+    unsigned i, v;
+    char*    p;
+    
+    for (i=0; i < BufferSize; ++i)
+      Buffer[i+1] = (i%128);
+
+    Buffer[0] = 255;                  // to check if start position is untouched
+    Buffer[BufferSize+2] = 255;       // to check if end position is untouched
+
+    // copy upwards
+    p = memmove(Buffer+2, Buffer+1, BufferSize);
+
+    // check buffer consistency before target
+    ASSERT_AreEqual(255, (unsigned)Buffer[0], "%u", "Unexpected value before range!");
+
+    // check buffer consistency at starting point
+    ASSERT_AreEqual(0, (unsigned)Buffer[1], "%u", "Unexpected value at range start!");
+
+    // check buffer consistency after range
+    ASSERT_AreEqual(255, (unsigned)Buffer[BufferSize+2], "%u", "Unexpected value after range!");
+
+    // check buffer values
+    for (i=0; i < BufferSize; ++i)
+    {
+        ASSERT_AreEqual(i%128, (unsigned)Buffer[i+2], "%u", "Unexpected value in buffer at position %u!" COMMA i+2);
+    }
+
+    v = Buffer[BufferSize+1];   // rember value of first untouched end-byte 
+
+    // copy downwards
+    p = memmove(Buffer+1, Buffer+2, BufferSize);
+
+    // check buffer consistency before target
+    ASSERT_AreEqual(255, (unsigned)Buffer[0], "%u", "Unexpected value before range!");
+
+    // check buffer consistency at end point
+    ASSERT_AreEqual(v, (unsigned)Buffer[BufferSize+1], "%u", "Unexpected value at range end!");
+
+    // check buffer consistency after range
+    ASSERT_AreEqual(255, (unsigned)Buffer[BufferSize+2], "%u", "Unexpected value after range!");
+
+    // check buffer values
+    for (i=0; i < BufferSize; ++i)
+    {
+        ASSERT_AreEqual(i%128, (unsigned)Buffer[i+1], "%u", "Unexpected value in buffer at position %u!" COMMA i+1);
+    }
+}
+ENDTEST
+
+