git: 9front

ref: 33bdd7e6c2bbfc7e2373b4e8d0371fd89dc31e52
dir: /sys/src/libc/port/memmove.c/

View raw version 
#include	<u.h>
#include	<libc.h>

void*
memmove(void *a1, void *a2, usize n)
{
	char *s1, *s2;

	s1 = a1;
	s2 = a2;
	if((s2 < s1) && (s2+n > s1))
		goto back;
	while(n > 0) {
		*s1++ = *s2++;
		n--;
	}
	return a1;

back:
	s1 += n;
	s2 += n;
	while(n > 0) {
		*--s1 = *--s2;
		n--;
	}
	return a1;
}

void*
memcpy(void *a1, void *a2, usize n)
{
	return memmove(a1, a2, n);
}