ilogb_test.c revision 293267 
1/*-
2 * Copyright (c) 2004 Stefan Farfeleder
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: stable/10/lib/msun/tests/ilogb_test.c 293267 2016-01-06 20:21:40Z ngie $
27 */
28
29#include <assert.h>
30#include <float.h>
31#include <limits.h>
32#include <math.h>
33#include <stdio.h>
34#include <stdlib.h>
35
36int
37main(void)
38{
39	char buf[128], *end;
40	double d;
41	float f;
42	long double ld;
43	int e, i;
44
45	printf("1..3\n");
46	assert(ilogb(0) == FP_ILOGB0);
47	assert(ilogb(NAN) == FP_ILOGBNAN);
48	assert(ilogb(INFINITY) == INT_MAX);
49	for (e = DBL_MIN_EXP - DBL_MANT_DIG; e < DBL_MAX_EXP; e++) {
50		snprintf(buf, sizeof(buf), "0x1.p%d", e);
51		d = strtod(buf, &end);
52		assert(*end == '\0');
53		i = ilogb(d);
54		assert(i == e);
55	}
56	printf("ok 1 - ilogb\n");
57
58	assert(ilogbf(0) == FP_ILOGB0);
59	assert(ilogbf(NAN) == FP_ILOGBNAN);
60	assert(ilogbf(INFINITY) == INT_MAX);
61	for (e = FLT_MIN_EXP - FLT_MANT_DIG; e < FLT_MAX_EXP; e++) {
62		snprintf(buf, sizeof(buf), "0x1.p%d", e);
63		f = strtof(buf, &end);
64		assert(*end == '\0');
65		i = ilogbf(f);
66		assert(i == e);
67	}
68	printf("ok 2 - ilogbf\n");
69
70	assert(ilogbl(0) == FP_ILOGB0);
71	assert(ilogbl(NAN) == FP_ILOGBNAN);
72	assert(ilogbl(INFINITY) == INT_MAX);
73	for (e = LDBL_MIN_EXP - LDBL_MANT_DIG; e < LDBL_MAX_EXP; e++) {
74		snprintf(buf, sizeof(buf), "0x1.p%d", e);
75		ld = strtold(buf, &end);
76		assert(*end == '\0');
77		i = ilogbl(ld);
78		assert(i == e);
79	}
80	printf("ok 3 - ilogbl\n");
81
82	return (0);
83}
84