libc/stdlib/t_strtod.c

/*	$NetBSD: t_strtod.c,v 1.12 2011/05/31 20:17:36 jruoho 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.
 *
 * 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.
 */

/* Public domain, Otto Moerbeek <otto (at) drijf.net>, 2006. */

#include <sys/cdefs.h>
__RCSID("$NetBSD: t_strtod.c,v 1.12 2011/05/31 20:17:36 jruoho Exp $");

#include <errno.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <atf-c.h>
#include <atf-c/config.h>

#if defined(__i386__) || defined(__amd64__) || defined(__sparc__)
#include <fenv.h>
#endif

ATF_TC(strtod_basic);
ATF_TC_HEAD(strtod_basic, tc)
{
	atf_tc_set_md_var(tc, "descr", "A basic test of strtod(3)");
}

ATF_TC_BODY(strtod_basic, tc)
{
	char buf[512];
	size_t i, n;
	double d;

	n = 1024 * 1000;

	for (i = 1; i < n; i = i + 1024) {

		(void)snprintf(buf, sizeof(buf), "%zu.%zu", i, i + 1);

		errno = 0;
		d = strtod(buf, NULL);

		ATF_REQUIRE(d > 0.0);
		ATF_REQUIRE(errno == 0);
	}
}

ATF_TC(strtod_hex);
ATF_TC_HEAD(strtod_hex, tc)
{
	atf_tc_set_md_var(tc, "descr", "A strtod(3) with hexadecimals");
}

ATF_TC_BODY(strtod_hex, tc)
{
	const char *str;
	char *end;
	double d;

	str = "-0x0";
	d = strtod(str, &end);	/* -0.0 */

	ATF_REQUIRE(end == str + 4);
	ATF_REQUIRE(signbit(d) != 0);
	ATF_REQUIRE(fabs(d) < 1.0e-40);

	str = "-0x";
	d = strtod(str, &end);	/* -0.0 */

	ATF_REQUIRE(end == str + 2);
	ATF_REQUIRE(signbit(d) != 0);
	ATF_REQUIRE(fabs(d) < 1.0e-40);
}

ATF_TC(strtod_inf);
ATF_TC_HEAD(strtod_inf, tc)
{
	atf_tc_set_md_var(tc, "descr", "A strtod(3) with INF");
}

ATF_TC_BODY(strtod_inf, tc)
{
#ifndef __vax__

	long double ld;
	double d;
	float f;

	/*
	 * See the closed PR lib/33262.
	 *
	 * This may also fail under QEMU; cf. PR misc/44767.
	 */
	if (system("cpuctl identify 0 | grep -q QEMU") == 0)
		atf_tc_expect_fail("PR misc/44767");

	d = strtod("INF", NULL);
	ATF_REQUIRE(isinf(d) != 0);

	f = strtof("INF", NULL);
	ATF_REQUIRE(isinf(f) != 0);

	ld = strtold("INF", NULL);
	ATF_REQUIRE(isinf(ld) != 0);
#endif
}

ATF_TC(strtod_round);
ATF_TC_HEAD(strtod_round, tc)
{
	atf_tc_set_md_var(tc, "descr", "Test rouding in strtod(3)");
}

ATF_TC_BODY(strtod_round, tc)
{
#if defined(__i386__) || defined(__amd64__) || defined(__sparc__)

	const char *val;
	double d1, d2;

	/*
	 * Test that strtod(3) honors the current rounding mode.
	 * The used value is somewhere near 1 + DBL_EPSILON + FLT_EPSILON.
	 *
	 * May fail under QEMU; cf. PR misc/44767.
	 */
	if (system("cpuctl identify 0 | grep -q QEMU") == 0)
		atf_tc_expect_fail("PR misc/44767");

	val = "1.00000011920928977282585492503130808472633361816406";

	(void)fesetround(FE_UPWARD);

	d1 = strtod(val, NULL);

	(void)fesetround(FE_DOWNWARD);

	d2 = strtod(val, NULL);

	ATF_REQUIRE(fabs(d1 - d2) > 0.0);
#endif
}

ATF_TC(strtod_underflow);
ATF_TC_HEAD(strtod_underflow, tc)
{
	atf_tc_set_md_var(tc, "descr", "Test underflow in strtod(3)");
}

ATF_TC_BODY(strtod_underflow, tc)
{

	const char *tmp =
	    "0.0000000000000000000000000000000000000000000000000000"
	    "000000000000000000000000000000000000000000000000000000"
	    "000000000000000000000000000000000000000000000000000000"
	    "000000000000000000000000000000000000000000000000000000"
	    "000000000000000000000000000000000000000000000000000000"
	    "000000000000000000000000000000000000000000000000000000"
	    "000000000000000000000000000000000000000000000000000000"
	    "000000000000000002";

	double d;

	errno = 0;
	d = strtod(tmp, NULL);

	if (errno != ERANGE)
		atf_tc_fail("strtod(3) did not detect underflow");
}

ATF_TP_ADD_TCS(tp)
{

	ATF_TP_ADD_TC(tp, strtod_basic);
	ATF_TP_ADD_TC(tp, strtod_hex);
	ATF_TP_ADD_TC(tp, strtod_inf);
	ATF_TP_ADD_TC(tp, strtod_round);
	ATF_TP_ADD_TC(tp, strtod_underflow);

	return atf_no_error();
}