/* $NetBSD: t_remquo.c,v 1.2 2024/09/20 22:24:51 rin Exp $ */

/*-
 * Copyright (c) 2011 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jukka Ruohonen and Greg Troxel.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <assert.h>
#include <atf-c.h>
#include <float.h>
#include <math.h>

/*
 * remquo(3)
 */
ATF_TC(remquo_args);
ATF_TC_HEAD(remquo_args, tc)
{
        atf_tc_set_md_var(tc, "descr", "Test some selected arguments");
}

ATF_TP_ADD_TCS(tp)
{

        ATF_TP_ADD_TC(tp, remquo_args);

        return atf_no_error();
}

#ifdef __vax__

ATF_TC_BODY(remquo_args, tc)
{
        atf_tc_expect_fail("PR 57881: vax libm is missing various symbols");
        atf_tc_fail("missing remquo on vax");
}

#else /* !__vax__ */

static const struct {
        double          x;
        double          y;
        double          r;      /* expected */
        int             quo;    /* expected */
} args[] = {
        { -135.0,       -90.0,          45.0,   2 },
        { -45.0,        -90.0,          -45.0,  8 },
        { 45.0,         -90.0,          45.0,   -8 },
        { 135.0,        -90.0,          -45.0,  -2 },
        { -180.0,       90.0,           -0.0,   -2 },
        { -135.0,       90.0,           45.0,   -2 },
        { -90.0,        90.0,           -0.0,   -1 },
        { -45.0,        90.0,           -45.0,  -8 },
        { 0.0,          90.0,           0.0,    0 },
        { 45.0,         90.0,           45.0,   8 },
        { 90.0,         90.0,           0.0,    1 },
        { 135.0,        90.0,           -45.0,  2 },
        { 180.0,        90.0,           0.0,    2 },
};

ATF_TC_BODY(remquo_args, tc)
{
        const double eps = DBL_EPSILON;
        size_t i;

        for (i = 0; i < __arraycount(args); i++) {
                double x = args[i].x;
                double y = args[i].y;
                double r;
                double r_exp = args[i].r;
                int quo;
                int quo_exp = args[i].quo;

                bool ok = true;

                r = remquo(x, y, &quo);

                ok &= (fabs(r - r_exp) <= eps);

                /*
                 * For now, consider 0 to have positive sign.
                 */
                if (quo_exp < 0 && quo >= 0)
                        ok = false;
                if (quo_exp >= 0 && quo < 0)
                        ok = false;

                /*
                 * The specification requires that quo be congruent to
                 * the integer remainder modulo 2^k for some k >=3.
                 */
                ok &= ((quo & 0x7) == (quo_exp & 0x7));

                if (!ok) {
                        atf_tc_fail_nonfatal("remquo(%g, %g) "
                            "r/quo expected %g/%d != %g/%d",
                             x, y, r_exp, quo_exp, r, quo);
                }
        }
}

#endif /* !__vax__ */