1 /* Basic tests for strtod.
2 Copyright (C) 1991-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <ctype.h>
20 #include <locale.h>
21 #include <stddef.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <errno.h>
25 #include <string.h>
26 #include <math.h>
27
28 struct ltest
29 {
30 const char *str; /* Convert this. */
31 double expect; /* To get this. */
32 char left; /* With this left over. */
33 int err; /* And this in errno. */
34 };
35 static const struct ltest tests[] =
36 {
37 { "12.345", 12.345, '\0', 0 },
38 { "12.345e19", 12.345e19, '\0', 0 },
39 { "-.1e+9", -.1e+9, '\0', 0 },
40 { ".125", .125, '\0', 0 },
41 { "1e20", 1e20, '\0', 0 },
42 { "0e-19", 0, '\0', 0 },
43 { "4\00012", 4.0, '\0', 0 },
44 { "5.9e-76", 5.9e-76, '\0', 0 },
45 { "0x1.4p+3", 10.0, '\0', 0 },
46 { "0xAp0", 10.0, '\0', 0 },
47 { "0x0Ap0", 10.0, '\0', 0 },
48 { "0x0A", 10.0, '\0', 0 },
49 { "0xA0", 160.0, '\0', 0 },
50 { "0x0.A0p8", 160.0, '\0', 0 },
51 { "0x0.50p9", 160.0, '\0', 0 },
52 { "0x0.28p10", 160.0, '\0', 0 },
53 { "0x0.14p11", 160.0, '\0', 0 },
54 { "0x0.0A0p12", 160.0, '\0', 0 },
55 { "0x0.050p13", 160.0, '\0', 0 },
56 { "0x0.028p14", 160.0, '\0', 0 },
57 { "0x0.014p15", 160.0, '\0', 0 },
58 { "0x00.00A0p16", 160.0, '\0', 0 },
59 { "0x00.0050p17", 160.0, '\0', 0 },
60 { "0x00.0028p18", 160.0, '\0', 0 },
61 { "0x00.0014p19", 160.0, '\0', 0 },
62 { "0x1p-1023",
63 1.11253692925360069154511635866620203210960799023116591527666e-308,
64 '\0', 0 },
65 { "0x0.8p-1022",
66 1.11253692925360069154511635866620203210960799023116591527666e-308,
67 '\0', 0 },
68 { "Inf", HUGE_VAL, '\0', 0 },
69 { "-Inf", -HUGE_VAL, '\0', 0 },
70 { "+InFiNiTy", HUGE_VAL, '\0', 0 },
71 { "0x80000Ap-23", 0x80000Ap-23, '\0', 0 },
72 { "1e-324", 0, '\0', ERANGE },
73 { "0x100000000000008p0", 0x1p56, '\0', 0 },
74 { "0x100000000000008.p0", 0x1p56, '\0', 0 },
75 { "0x100000000000008.00p0", 0x1p56, '\0', 0 },
76 { "0x10000000000000800p0", 0x1p64, '\0', 0 },
77 { "0x10000000000000801p0", 0x1.0000000000001p64, '\0', 0 },
78 { NULL, 0, '\0', 0 }
79 };
80
81 static void expand (char *dst, int c);
82 static int long_dbl (void);
83
84 static int
85 do_test (void)
86 {
87 char buf[100];
88 const struct ltest *lt;
89 char *ep;
90 int status = 0;
91 int save_errno;
92
93 for (lt = tests; lt->str != NULL; ++lt)
94 {
95 double d;
96
97 errno = 0;
98 d = strtod(lt->str, &ep);
99 save_errno = errno;
100 printf ("strtod (\"%s\") test %u",
101 lt->str, (unsigned int) (lt - tests));
102 if (d == lt->expect && *ep == lt->left && save_errno == lt->err)
103 puts ("\tOK");
104 else
105 {
106 puts ("\tBAD");
107 if (d != lt->expect)
108 printf (" returns %.60g, expected %.60g\n", d, lt->expect);
109 if (lt->left != *ep)
110 {
111 char exp1[5], exp2[5];
112 expand (exp1, *ep);
113 expand (exp2, lt->left);
114 printf (" leaves '%s', expected '%s'\n", exp1, exp2);
115 }
116 if (save_errno != lt->err)
117 printf (" errno %d (%s) instead of %d (%s)\n",
118 save_errno, strerror (save_errno),
119 lt->err, strerror (lt->err));
120 status = 1;
121 }
122 }
123
124 sprintf (buf, "%f", strtod ("-0.0", NULL));
125 if (strcmp (buf, "-0.000000") != 0)
126 {
127 printf (" strtod (\"-0.0\", NULL) returns \"%s\"\n", buf);
128 status = 1;
129 }
130
131 const char input[] = "3752432815e-39";
132
133 float f1 = strtold (input, NULL);
134 float f2;
135 float f3 = strtof (input, NULL);
136 sscanf (input, "%g", &f2);
137
138 if (f1 != f2)
139 {
140 printf ("f1 = %a != f2 = %a\n", f1, f2);
141 status = 1;
142 }
143 if (f1 != f3)
144 {
145 printf ("f1 = %a != f3 = %a\n", f1, f3);
146 status = 1;
147 }
148 if (f2 != f3)
149 {
150 printf ("f2 = %a != f3 = %a\n", f2, f3);
151 status = 1;
152 }
153
154 const char input2[] = "+1.000000000116415321826934814453125";
155 if (strtold (input2, NULL) != +1.000000000116415321826934814453125L)
156 {
157 printf ("input2: %La != %La\n", strtold (input2, NULL),
158 +1.000000000116415321826934814453125L);
159 status = 1;
160 }
161
162 static struct { const char *str; long double l; } ltests[] =
163 {
164 { "42.0000000000000000001", 42.0000000000000000001L },
165 { "42.00000000000000000001", 42.00000000000000000001L },
166 { "42.000000000000000000001", 42.000000000000000000001L }
167 };
168 int n;
169 for (n = 0; n < sizeof (ltests) / sizeof (ltests[0]); ++n)
170 if (strtold (ltests[n].str, NULL) != ltests[n].l)
171 {
172 printf ("ltests[%d]: %La != %La\n", n,
173 strtold (ltests[n].str, NULL), ltests[n].l);
174 status = 1;
175 }
176
177 status |= long_dbl ();
178
179 return status ? EXIT_FAILURE : EXIT_SUCCESS;
180 }
181
182 static void
183 expand (char *dst, int c)
184 {
185 if (isprint (c))
186 {
187 dst[0] = c;
188 dst[1] = '\0';
189 }
190 else
191 (void) sprintf (dst, "%#.3o", (unsigned int) c);
192 }
193
194 static int
195 long_dbl (void)
196 {
197 /* Regenerate this string using
198
199 echo '(2^53-1)*2^(1024-53)' | bc | sed 's/\([^\]*\)\\*$/ "\1"/'
200
201 */
202 static const char longestdbl[] =
203 "17976931348623157081452742373170435679807056752584499659891747680315"
204 "72607800285387605895586327668781715404589535143824642343213268894641"
205 "82768467546703537516986049910576551282076245490090389328944075868508"
206 "45513394230458323690322294816580855933212334827479782620414472316873"
207 "8177180919299881250404026184124858368";
208 double d = strtod (longestdbl, NULL);
209
210 printf ("strtod (\"%s\", NULL) = %g\n", longestdbl, d);
211
212 if (d != 179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321326889464182768467546703537516986049910576551282076245490090389328944075868508455133942304583236903222948165808559332123348274797826204144723168738177180919299881250404026184124858368.000000)
213 return 1;
214
215 return 0;
216 }
217
218 #include <support/test-driver.c>