1 files changed, 35 insertions, 0 deletions
diff --git a/src/string/memmove.c b/src/string/memmove.c
new file mode 100644
index 00000000..33000e0e
--- /dev/null
+++ b/src/string/memmove.c
@@ -0,0 +1,35 @@
+#include <string.h>
+#include "nonstd/assert.h"
+
+/** move memory **/
+void * memmove(void *s1, const void *s2, size_t n)
+{
+	ASSERT_NONNULL(s1);
+	ASSERT_NONNULL(s2);
+
+	if (s1 < s2) {
+		return memcpy(s1, s2, n);
+	}
+
+	/* reverse memcpy() */
+	while (n > 0) {
+		((char*)s1)[n] = ((char*)s2)[n];
+		n--;
+	}
+	/* last byte */
+	((char*)s1)[n] = ((char*)s2)[n];
+
+	/*
+	RETURN_ALWAYS(ARGUMENT(s1));
+	*/
+	return s1;
+}
+
+/***
+copies ARGUMENT(n) bytes of memory from the object at
+ARGUMENT(s2) to the object at ARGUMENT(s1). If ARGUMENT(s1) and ARGUMENT(s2) overlap, the memory
+is copied so that the ARGUMENT(n) bytes are safely written to ARGUMENT(s1).
+***/
+/*
+STDC(1)
+*/