1 /* $OpenBSD: nan_test.c,v 1.3 2021/12/13 18:04:28 deraadt Exp $ */
2 /*-
3 * Copyright (C) 2007 David Schultz <das@FreeBSD.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include "macros.h"
29
30 /*
31 * Test for nan(), nanf(), and nanl(). We also test that strtod("nan(...)")
32 * and sscanf("nan(...)", ...) work identically.
33 */
34
35 #include <sys/types.h>
36 #include <fenv.h>
37 #include <float.h>
38 #include <locale.h>
39 #include <math.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <string.h>
43
44 #include "test-utils.h"
45
46 static void
testnan(const char * nan_format)47 testnan(const char *nan_format)
48 {
49 char nan_str[128];
50 char *end;
51 long double ald[4];
52 double ad[4];
53 float af[4];
54 unsigned i;
55
56 snprintf(nan_str, sizeof(nan_str), "nan(%s)", nan_format);
57 for (i = 0; i < nitems(ad); i++) {
58 /*
59 * x86 has an 80-bit long double stored in 96 bits,
60 * so we need to initialize the memory for the memcmp()
61 * checks below to work.
62 */
63 bzero(&af[i], sizeof(float));
64 bzero(&ad[i], sizeof(double));
65 bzero(&ald[i], sizeof(long double));
66 }
67
68 af[0] = nanf(nan_format);
69 ATF_REQUIRE(isnan(af[0]));
70 af[1] = strtof(nan_str, &end);
71 ATF_REQUIRE(end == nan_str + strlen(nan_str));
72 ATF_REQUIRE(sscanf(nan_str, "%e", &af[2]) == 1);
73 ATF_REQUIRE(memcmp(&af[0], &af[1], sizeof(float)) == 0);
74 ATF_REQUIRE(memcmp(&af[1], &af[2], sizeof(float)) == 0);
75 if (*nan_format == '\0') {
76 /* nanf("") == strtof("nan") */
77 af[3] = strtof("nan", NULL);
78 ATF_REQUIRE(memcmp(&af[2], &af[3], sizeof(float)) == 0);
79 }
80
81 ad[0] = nan(nan_format);
82 ATF_REQUIRE(isnan(ad[0]));
83 ad[1] = strtod(nan_str, &end);
84 ATF_REQUIRE(end == nan_str + strlen(nan_str));
85 ATF_REQUIRE(sscanf(nan_str, "%le", &ad[2]) == 1);
86 ATF_REQUIRE(memcmp(&ad[0], &ad[1], sizeof(double)) == 0);
87 ATF_REQUIRE(memcmp(&ad[1], &ad[2], sizeof(double)) == 0);
88 if (*nan_format == '\0') {
89 /* nan("") == strtod("nan") */
90 ad[3] = strtod("nan", NULL);
91 ATF_REQUIRE(memcmp(&ad[2], &ad[3], sizeof(double)) == 0);
92 }
93
94 ald[0] = nanl(nan_format);
95 ATF_REQUIRE(isnan(ald[0]));
96 ald[1] = strtold(nan_str, &end);
97 ATF_REQUIRE(end == nan_str + strlen(nan_str));
98 ATF_REQUIRE(sscanf(nan_str, "%Le", &ald[2]) == 1);
99 ATF_REQUIRE(memcmp(&ald[0], &ald[1], sizeof(long double)) == 0);
100 ATF_REQUIRE(memcmp(&ald[1], &ald[2], sizeof(long double)) == 0);
101 if (*nan_format == '\0') {
102 /* nanl("") == strtold("nan") */
103 ald[3] = strtold("nan", NULL);
104 ATF_REQUIRE(memcmp(&ald[2], &ald[3], sizeof(long double)) == 0);
105 }
106 }
107
108 ATF_TC_WITHOUT_HEAD(nan);
ATF_TC_BODY(nan,tc)109 ATF_TC_BODY(nan, tc)
110 {
111 /* Die if a signalling NaN is returned */
112 feenableexcept(FE_INVALID);
113
114 testnan("0x1234");
115 testnan("");
116 }
117
ATF_TP_ADD_TCS(tp)118 ATF_TP_ADD_TCS(tp)
119 {
120 ATF_TP_ADD_TC(tp, nan);
121
122 return (atf_no_error());
123 }
124