/*      $OpenBSD: nextafter.c,v 1.2 2011/07/09 03:33:07 martynas Exp $  */

/*
 * Written by Martynas Venckus.  Public domain
 */

#include <assert.h>
#include <math.h>

#define test(f, r)      (                                       \
        ((f) == (r) && signbit((f)) == signbit((r))) ||         \
        (isnan((f)) && isnan((r)))                              \
)

int
main(int argc, char *argv[])
{
        assert(test(nextafter(0.0, 0.0), 0.0));
        assert(test(nextafter(-0.0, 0.0), 0.0));
        assert(test(nextafter(0.0, -0.0), -0.0));
        assert(test(nextafter(-0.0, -0.0), -0.0));

        assert(test(nextafterf(0.0F, 0.0F), 0.0F));
        assert(test(nextafterf(-0.0F, 0.0F), 0.0F));
        assert(test(nextafterf(0.0F, -0.0F), -0.0F));
        assert(test(nextafterf(-0.0F, -0.0F), -0.0F));

        assert(test(nextafterl(0.0L, 0.0L), 0.0L));
        assert(test(nextafterl(-0.0L, 0.0L), 0.0L));
        assert(test(nextafterl(0.0L, -0.0L), -0.0L));
        assert(test(nextafterf(-0.0L, -0.0L), -0.0L));

        assert(test(nextafter(NAN, 1.0), NAN));
        assert(test(nextafter(1.0, NAN), NAN));
        assert(test(nextafter(NAN, NAN), NAN));

        assert(test(nextafterf(NAN, 1.0F), NAN));
        assert(test(nextafterf(1.0F, NAN), NAN));
        assert(test(nextafterf(NAN, NAN), NAN));

        assert(test(nextafterl(NAN, 1.0L), NAN));
        assert(test(nextafterl(1.0L, NAN), NAN));
        assert(test(nextafterl(NAN, NAN), NAN));

        assert(test(nextafter(0x1.fffffffffffffp+0, INFINITY), 0x1p1));
        assert(test(nextafter(0x1p1, -INFINITY), 0x1.fffffffffffffp+0));

        assert(test(nextafterf(0x1.fffffep+0f, INFINITY), 0x1p1f));
        assert(test(nextafterf(0x1p1f, -INFINITY), 0x1.fffffep+0f));

        return (0);
}