stdlib/tst-strtod.c

   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
  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>