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[libc] Add memmove()

--- a/libc/src/Makefile

+++ b/libc/src/Makefile

@@ -3,7 +3,7 @@

 LIBCOBJ = assert.o strcpy.o strcmp.o strlen.o strchr.o \

           strrchr.o strcat.o strncpy.o strncat.o \

-          memset.o memcpy.o

+          memset.o memcpy.o memmove.o

 all: libc.a

--- /dev/null

+++ b/libc/src/memmove.c

@@ -1,0 +1,19 @@

+/* See LICENSE file for copyright and license details. */

+

+#include <string.h>

+

+void *

+memmove(void *dst, const void *src, size_t n)

+{

+	char *d = dst, *s = (char *) src;

+

+	if (d < s) {

+		while (n-- > 0)

+			*d++ = *s++;

+	} else {

+		s += n-1, d += n-1;

+		while (n-- > 0)

+			*d-- = *s--;

+	}

+	return dst;

+}