1 files changed, 36 insertions, 0 deletions
diff --git a/roms/skiboot/libc/string/memmove.c b/roms/skiboot/libc/string/memmove.c
new file mode 100644
index 000000000..76aef6c87
--- /dev/null
+++ b/roms/skiboot/libc/string/memmove.c
@@ -0,0 +1,36 @@
+/******************************************************************************
+ * Copyright (c) 2004, 2008 IBM Corporation
+ * All rights reserved.
+ * This program and the accompanying materials
+ * are made available under the terms of the BSD License
+ * which accompanies this distribution, and is available at
+ * http://www.opensource.org/licenses/bsd-license.php
+ *
+ * Contributors:
+ *     IBM Corporation - initial implementation
+ *****************************************************************************/
+
+#include <stddef.h>
+
+void *memcpy(void *dest, const void *src, size_t n);
+void *memmove(void *dest, const void *src, size_t n);
+void *memmove(void *dest, const void *src, size_t n)
+{
+	/* Do the buffers overlap in a bad way? */
+	if (src < dest && src + n >= dest) {
+		char *cdest;
+		const char *csrc;
+		int i;
+
+		/* Copy from end to start */
+		cdest = dest + n - 1;
+		csrc = src + n - 1;
+		for (i = 0; i < n; i++) {
+			*cdest-- = *csrc--;
+		}
+		return dest;
+	} else {
+		/* Normal copy is possible */
+		return memcpy(dest, src, n);
+	}
+}