pull upstream changes, add auto formatting

1 files changed, 49 insertions, 0 deletions

diff --git a/lib/memmove.c b/lib/memmove.c
new file mode 100644
index 0000000..e674c49
--- /dev/null
+++ b/lib/memmove.c
@@ -0,0 +1,49 @@
+/**
+** @file	memmove.c
+**
+** @author	Numerous CSCI-452 classes
+**
+** @brief	C implementations of common library functions
+*/
+
+#ifndef MEMMOVE_SRC_INC
+#define MEMMOVE_SRC_INC
+
+#include <common.h>
+
+#include <lib.h>
+
+/**
+** memmove(dst,src,len)
+**
+** Copy a block from one place to another. Deals with overlapping
+** buffers.
+**
+** @param dst   Destination buffer
+** @param src   Source buffer
+** @param len   Buffer size (in bytes)
+*/
+void memmove(void *dst, const void *src, register uint32_t len)
+{
+	register uint8_t *dest = dst;
+	register const uint8_t *source = src;
+
+	/*
+	** We could speed this up by unrolling it and copying
+	** words at a time (instead of bytes).
+	*/
+
+	if (source < dest && (source + len) > dest) {
+		source += len;
+		dest += len;
+		while (len-- > 0) {
+			*--dest = *--source;
+		}
+	} else {
+		while (len--) {
+			*dest++ = *source++;
+		}
+	}
+}
+
+#endif