1/*-
2 * Copyright (C) 2007 David Schultz <das@FreeBSD.org>
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
27/*
28 * Test for nan(), nanf(), and nanl(). We also test that strtod("nan(...)")
29 * and sscanf("nan(...)", ...) work identically.
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD$");
34
35#include <sys/param.h>
36#include <assert.h>
37#include <fenv.h>
38#include <float.h>
39#include <locale.h>
40#include <math.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44
45static void
46testnan(const char *nan_format)
47{
48	char nan_str[128];
49	char *end;
50	long double ald[4];
51	double ad[4];
52	float af[4];
53	unsigned i;
54
55	snprintf(nan_str, sizeof(nan_str), "nan(%s)", nan_format);
56	for (i = 0; i < nitems(ad); i++) {
57		/*
58		 * x86 has an 80-bit long double stored in 96 bits,
59		 * so we need to initialize the memory for the memcmp()
60		 * checks below to work.
61		 */
62		bzero(&af[i], sizeof(float));
63		bzero(&ad[i], sizeof(double));
64		bzero(&ald[i], sizeof(long double));
65	}
66
67	af[0] = nanf(nan_format);
68	assert(isnan(af[0]));
69	af[1] = strtof(nan_str, &end);
70	assert(end == nan_str + strlen(nan_str));
71	assert(sscanf(nan_str, "%e", &af[2]) == 1);
72	assert(memcmp(&af[0], &af[1], sizeof(float)) == 0);
73	assert(memcmp(&af[1], &af[2], sizeof(float)) == 0);
74	if (*nan_format == '\0') {
75		/* nanf("") == strtof("nan") */
76		af[3] = strtof("nan", NULL);
77		assert(memcmp(&af[2], &af[3], sizeof(float)) == 0);
78	}
79
80	ad[0] = nan(nan_format);
81	assert(isnan(ad[0]));
82	ad[1] = strtod(nan_str, &end);
83	assert(end == nan_str + strlen(nan_str));
84	assert(sscanf(nan_str, "%le", &ad[2]) == 1);
85	assert(memcmp(&ad[0], &ad[1], sizeof(double)) == 0);
86	assert(memcmp(&ad[1], &ad[2], sizeof(double)) == 0);
87	if (*nan_format == '\0') {
88		/* nan("") == strtod("nan") */
89		ad[3] = strtod("nan", NULL);
90		assert(memcmp(&ad[2], &ad[3], sizeof(double)) == 0);
91	}
92
93	ald[0] = nanl(nan_format);
94	assert(isnan(ald[0]));
95	ald[1] = strtold(nan_str, &end);
96	assert(end == nan_str + strlen(nan_str));
97	assert(sscanf(nan_str, "%Le", &ald[2]) == 1);
98	assert(memcmp(&ald[0], &ald[1], sizeof(long double)) == 0);
99	assert(memcmp(&ald[1], &ald[2], sizeof(long double)) == 0);
100	if (*nan_format == '\0') {
101		/* nanl("") == strtold("nan") */
102		ald[3] = strtold("nan", NULL);
103		assert(memcmp(&ald[2], &ald[3], sizeof(long double)) == 0);
104	}
105}
106
107int
108main(void)
109{
110
111	printf("1..1\n");
112
113	/* Die if a signalling NaN is returned */
114	feenableexcept(FE_INVALID);
115
116	testnan("0x1234");
117	testnan("");
118
119	printf("ok 1 - nan\n");
120
121	return (0);
122}
123