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/**
** @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
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