1 /* Basic tests for strtod.
2    Copyright (C) 1991-2022 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
do_test(void)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
expand(char * dst,int c)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
long_dbl(void)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>
219