Subversion Repositories planix.SVN

#include        <u.h>
#include        <libc.h>

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

        if((long)n < 0)
                abort();
        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, ulong n)
{
        return memmove(a1, a2, n);
}