From c7ded89f051e0b9ab631ee0c11bc02d1c877ab53 Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Wed, 23 Jan 2019 08:31:23 +0100
Subject: [PATCH] LibC: Support backwards copy in memmove().

---
 LibC/string.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/LibC/string.cpp b/LibC/string.cpp
index 175e0501e2..1929bf282c 100644
--- a/LibC/string.cpp
+++ b/LibC/string.cpp
@@ -141,8 +141,12 @@ void* memmove(void* dest, const void* src, size_t n)
 {
     if (dest < src)
         return memcpy(dest, src, n);
-    // FIXME: Implement backwards copy.
-    assert(false);
+
+    byte *pd = (byte*)dest;
+    const byte *ps = (const byte*)src;
+    for (pd += n, ps += n; n--;)
+        *--pd = *--ps;
+    return dest;
 }
 
 char* strcpy(char* dest, const char *src)