usr/src/lib/libc/quad/moddi3.c

/*-
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * %sccs.include.redist.c%
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)moddi3.c    8.1 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include "quad.h"

/*
 * Return remainder after dividing two signed quads.
 *
 * XXX
 * If -1/2 should produce -1 on this machine, this code is wrong.
 */
quad_t
__moddi3(a, b)
        quad_t a, b;
{
        u_quad_t ua, ub, ur;
        int neg;

        if (a < 0)
                ua = -(u_quad_t)a, neg = 1;
        else
                ua = a, neg = 0;
        if (b < 0)
                ub = -(u_quad_t)b, neg ^= 1;
        else
                ub = b;
        (void)__qdivrem(ua, ub, &ur);
        return (neg ? -ur : ur);
}