source: trunk/minix/lib/ansi/memmove.c@ 12

/*
 * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
 * See the copyright notice in the ACK home directory, in the file "Copyright".
 */
/* $Header: /cvsup/minix/src/lib/ansi/memmove.c,v 1.1.1.1 2005/04/21 14:56:05 beng Exp $ */

#include        <string.h>

void *
memmove(void *s1, const void *s2, register size_t n)
{
        register char *p1 = s1;
        register const char *p2 = s2;

        if (n>0) {
                if (p2 <= p1 && p2 + n > p1) {
                        /* overlap, copy backwards */
                        p1 += n;
                        p2 += n;
                        n++;
                        while (--n > 0) {
                                *--p1 = *--p2;
                        }
                } else {
                        n++;
                        while (--n > 0) {
                                *p1++ = *p2++;
                        }
                }
        }
        return s1;
}