stdlib/tst-strtod.c

   1 /* Copyright (C) 1991-2012 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <ctype.h>
  19 #include <locale.h>
  20 #include <stddef.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <errno.h>
  24 #include <string.h>
  25 #include <math.h>
  26
  27 struct ltest
  28   {
  29     const char *str;            /* Convert this.  */
  30     double expect;              /* To get this.  */
  31     char left;                  /* With this left over.  */
  32     int err;                    /* And this in errno.  */
  33   };
  34 static const struct ltest tests[] =
  35   {
  36     { "12.345", 12.345, '\0', 0 },
  37     { "12.345e19", 12.345e19, '\0', 0 },
  38     { "-.1e+9", -.1e+9, '\0', 0 },
  39     { ".125", .125, '\0', 0 },
  40     { "1e20", 1e20, '\0', 0 },
  41     { "0e-19", 0, '\0', 0 },
  42     { "4\00012", 4.0, '\0', 0 },
  43     { "5.9e-76", 5.9e-76, '\0', 0 },
  44     { "0x1.4p+3", 10.0, '\0', 0 },
  45     { "0xAp0", 10.0, '\0', 0 },
  46     { "0x0Ap0", 10.0, '\0', 0 },
  47     { "0x0A", 10.0, '\0', 0 },
  48     { "0xA0", 160.0, '\0', 0 },
  49     { "0x0.A0p8", 160.0, '\0', 0 },
  50     { "0x0.50p9", 160.0, '\0', 0 },
  51     { "0x0.28p10", 160.0, '\0', 0 },
  52     { "0x0.14p11", 160.0, '\0', 0 },
  53     { "0x0.0A0p12", 160.0, '\0', 0 },
  54     { "0x0.050p13", 160.0, '\0', 0 },
  55     { "0x0.028p14", 160.0, '\0', 0 },
  56     { "0x0.014p15", 160.0, '\0', 0 },
  57     { "0x00.00A0p16", 160.0, '\0', 0 },
  58     { "0x00.0050p17", 160.0, '\0', 0 },
  59     { "0x00.0028p18", 160.0, '\0', 0 },
  60     { "0x00.0014p19", 160.0, '\0', 0 },
  61     { "0x1p-1023",
  62       1.11253692925360069154511635866620203210960799023116591527666e-308,
  63       '\0', ERANGE },
  64     { "0x0.8p-1022",
  65       1.11253692925360069154511635866620203210960799023116591527666e-308,
  66       '\0', ERANGE },
  67     { "Inf", HUGE_VAL, '\0', 0 },
  68     { "-Inf", -HUGE_VAL, '\0', 0 },
  69     { "+InFiNiTy", HUGE_VAL, '\0', 0 },
  70     { "0x80000Ap-23", 0x80000Ap-23, '\0', 0 },
  71     { "1e-324", 0, '\0', ERANGE },
  72     { NULL, 0, '\0', 0 }
  73   };
  74
  75 static void expand (char *dst, int c);
  76 static int long_dbl (void);
  77 static int locale_test (void);
  78
  79 int
  80 main (int argc, char ** argv)
  81 {
  82   char buf[100];
  83   register const struct ltest *lt;
  84   char *ep;
  85   int status = 0;
  86   int save_errno;
  87
  88   for (lt = tests; lt->str != NULL; ++lt)
  89     {
  90       double d;
  91
  92       errno = 0;
  93       d = strtod(lt->str, &ep);
  94       save_errno = errno;
  95       printf ("strtod (\"%s\") test %u",
  96              lt->str, (unsigned int) (lt - tests));
  97       if (d == lt->expect && *ep == lt->left && save_errno == lt->err)
  98         puts ("\tOK");
  99       else
 100         {
 101           puts ("\tBAD");
 102           if (d != lt->expect)
 103             printf ("  returns %.60g, expected %.60g\n", d, lt->expect);
 104           if (lt->left != *ep)
 105             {
 106               char exp1[5], exp2[5];
 107               expand (exp1, *ep);
 108               expand (exp2, lt->left);
 109               printf ("  leaves '%s', expected '%s'\n", exp1, exp2);
 110             }
 111           if (save_errno != lt->err)
 112             printf ("  errno %d (%s)  instead of %d (%s)\n",
 113                     save_errno, strerror (save_errno),
 114                     lt->err, strerror (lt->err));
 115           status = 1;
 116         }
 117     }
 118
 119   sprintf (buf, "%f", strtod ("-0.0", NULL));
 120   if (strcmp (buf, "-0.000000") != 0)
 121     {
 122       printf ("  strtod (\"-0.0\", NULL) returns \"%s\"\n", buf);
 123       status = 1;
 124     }
 125
 126   const char input[] = "3752432815e-39";
 127
 128   float f1 = strtold (input, NULL);
 129   float f2;
 130   float f3 = strtof (input, NULL);
 131   sscanf (input, "%g", &f2);
 132
 133   if (f1 != f2)
 134     {
 135       printf ("f1 = %a != f2 = %a\n", f1, f2);
 136       status = 1;
 137     }
 138   if (f1 != f3)
 139     {
 140       printf ("f1 = %a != f3 = %a\n", f1, f3);
 141       status = 1;
 142     }
 143   if (f2 != f3)
 144     {
 145       printf ("f2 = %a != f3 = %a\n", f2, f3);
 146       status = 1;
 147     }
 148
 149   const char input2[] = "+1.000000000116415321826934814453125";
 150   if (strtold (input2, NULL) != +1.000000000116415321826934814453125L)
 151     {
 152       printf ("input2: %La != %La\n", strtold (input2, NULL),
 153               +1.000000000116415321826934814453125L);
 154       status = 1;
 155     }
 156
 157   static struct { const char *str; long double l; } ltests[] =
 158     {
 159       { "42.0000000000000000001", 42.0000000000000000001L },
 160       { "42.00000000000000000001", 42.00000000000000000001L },
 161       { "42.000000000000000000001", 42.000000000000000000001L }
 162     };
 163   int n;
 164   for (n = 0; n < sizeof (ltests) / sizeof (ltests[0]); ++n)
 165     if (strtold (ltests[n].str, NULL) != ltests[n].l)
 166       {
 167         printf ("ltests[%d]: %La != %La\n", n,
 168                 strtold (ltests[n].str, NULL), ltests[n].l);
 169         status = 1;
 170       }
 171
 172   status |= long_dbl ();
 173
 174   status |= locale_test ();
 175
 176   return status ? EXIT_FAILURE : EXIT_SUCCESS;
 177 }
 178
 179 static void
 180 expand (dst, c)
 181      char *dst;
 182      register int c;
 183 {
 184   if (isprint (c))
 185     {
 186       dst[0] = c;
 187       dst[1] = '\0';
 188     }
 189   else
 190     (void) sprintf (dst, "%#.3o", (unsigned int) c);
 191 }
 192
 193 static int
 194 long_dbl (void)
 195 {
 196   /* Regenerate this string using
 197
 198      echo '(2^53-1)*2^(1024-53)' | bc | sed 's/\([^\]*\)\\*$/    "\1"/'
 199
 200   */
 201   static const char longestdbl[] =
 202     "17976931348623157081452742373170435679807056752584499659891747680315"
 203     "72607800285387605895586327668781715404589535143824642343213268894641"
 204     "82768467546703537516986049910576551282076245490090389328944075868508"
 205     "45513394230458323690322294816580855933212334827479782620414472316873"
 206     "8177180919299881250404026184124858368";
 207   double d = strtod (longestdbl, NULL);
 208
 209   printf ("strtod (\"%s\", NULL) = %g\n", longestdbl, d);
 210
 211   if (d != 179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321326889464182768467546703537516986049910576551282076245490090389328944075868508455133942304583236903222948165808559332123348274797826204144723168738177180919299881250404026184124858368.000000)
 212     return 1;
 213
 214   return 0;
 215 }
 216
 217 /* Perform a few tests in a locale with thousands separators.  */
 218 static int
 219 locale_test (void)
 220 {
 221   static const struct
 222   {
 223     const char *loc;
 224     const char *str;
 225     double exp;
 226     ptrdiff_t nread;
 227   } tests[] =
 228     {
 229       { "de_DE.UTF-8", "1,5", 1.5, 3 },
 230       { "de_DE.UTF-8", "1.5", 1.0, 1 },
 231       { "de_DE.UTF-8", "1.500", 1500.0, 5 },
 232       { "de_DE.UTF-8", "36.893.488.147.419.103.232", 0x1.0p65, 26 }
 233     };
 234 #define ntests (sizeof (tests) / sizeof (tests[0]))
 235   size_t n;
 236   int result = 0;
 237
 238   puts ("\nLocale tests");
 239
 240   for (n = 0; n < ntests; ++n)
 241     {
 242       double d;
 243       char *endp;
 244
 245       if (setlocale (LC_ALL, tests[n].loc) == NULL)
 246         {
 247           printf ("cannot set locale %s\n", tests[n].loc);
 248           result = 1;
 249           continue;
 250         }
 251
 252       /* We call __strtod_interal here instead of strtod to tests the
 253          handling of grouping.  */
 254       d = __strtod_internal (tests[n].str, &endp, 1);
 255       if (d != tests[n].exp)
 256         {
 257           printf ("strtod(\"%s\") returns %g and not %g\n",
 258                   tests[n].str, d, tests[n].exp);
 259           result = 1;
 260         }
 261       else if (endp - tests[n].str != tests[n].nread)
 262         {
 263           printf ("strtod(\"%s\") read %td bytes and not %td\n",
 264                   tests[n].str, endp - tests[n].str, tests[n].nread);
 265           result = 1;
 266         }
 267     }
 268
 269   if (result == 0)
 270     puts ("all OK");
 271
 272   return result;
 273 }