stdlib/tst-strtod.c

   1 /* Copyright (C) 1991,1996-2001,2003,2009,2011 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  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', ERANGE },
  65     { "0x0.8p-1022",
  66       1.11253692925360069154511635866620203210960799023116591527666e-308,
  67       '\0', ERANGE },
  68 #if __GNUC_PREREQ(2,96)
  69     /* For older GCC release HUGE_VAL is not a constant.  */
  70     { "Inf", HUGE_VAL, '\0', 0 },
  71     { "-Inf", -HUGE_VAL, '\0', 0 },
  72     { "+InFiNiTy", HUGE_VAL, '\0', 0 },
  73 #endif
  74     { "0x80000Ap-23", 0x80000Ap-23, '\0', 0 },
  75     { "1e-324", 0, '\0', ERANGE },
  76     { NULL, 0, '\0', 0 }
  77   };
  78
  79 static void expand (char *dst, int c);
  80 static int long_dbl (void);
  81 static int locale_test (void);
  82
  83 int
  84 main (int argc, char ** argv)
  85 {
  86   char buf[100];
  87   register const struct ltest *lt;
  88   char *ep;
  89   int status = 0;
  90   int save_errno;
  91
  92   for (lt = tests; lt->str != NULL; ++lt)
  93     {
  94       double d;
  95
  96       errno = 0;
  97       d = strtod(lt->str, &ep);
  98       save_errno = errno;
  99       printf ("strtod (\"%s\") test %u",
 100              lt->str, (unsigned int) (lt - tests));
 101       if (d == lt->expect && *ep == lt->left && save_errno == lt->err)
 102         puts ("\tOK");
 103       else
 104         {
 105           puts ("\tBAD");
 106           if (d != lt->expect)
 107             printf ("  returns %.60g, expected %.60g\n", d, lt->expect);
 108           if (lt->left != *ep)
 109             {
 110               char exp1[5], exp2[5];
 111               expand (exp1, *ep);
 112               expand (exp2, lt->left);
 113               printf ("  leaves '%s', expected '%s'\n", exp1, exp2);
 114             }
 115           if (save_errno != lt->err)
 116             printf ("  errno %d (%s)  instead of %d (%s)\n",
 117                     save_errno, strerror (save_errno),
 118                     lt->err, strerror (lt->err));
 119           status = 1;
 120         }
 121     }
 122
 123   sprintf (buf, "%f", strtod ("-0.0", NULL));
 124   if (strcmp (buf, "-0.000000") != 0)
 125     {
 126       printf ("  strtod (\"-0.0\", NULL) returns \"%s\"\n", buf);
 127       status = 1;
 128     }
 129
 130   const char input[] = "3752432815e-39";
 131
 132   float f1 = strtold (input, NULL);
 133   float f2;
 134   float f3 = strtof (input, NULL);
 135   sscanf (input, "%g", &f2);
 136
 137   if (f1 != f2)
 138     {
 139       printf ("f1 = %a != f2 = %a\n", f1, f2);
 140       status = 1;
 141     }
 142   if (f1 != f3)
 143     {
 144       printf ("f1 = %a != f3 = %a\n", f1, f3);
 145       status = 1;
 146     }
 147   if (f2 != f3)
 148     {
 149       printf ("f2 = %a != f3 = %a\n", f2, f3);
 150       status = 1;
 151     }
 152
 153   const char input2[] = "+1.000000000116415321826934814453125";
 154   if (strtold (input2, NULL) != +1.000000000116415321826934814453125L)
 155     {
 156       printf ("input2: %La != %La\n", strtold (input2, NULL),
 157               +1.000000000116415321826934814453125L);
 158       status = 1;
 159     }
 160
 161   static struct { const char *str; long double l; } ltests[] =
 162     {
 163       { "42.0000000000000000001", 42.0000000000000000001L },
 164       { "42.00000000000000000001", 42.00000000000000000001L },
 165       { "42.000000000000000000001", 42.000000000000000000001L }
 166     };
 167   int n;
 168   for (n = 0; n < sizeof (ltests) / sizeof (ltests[0]); ++n)
 169     if (strtold (ltests[n].str, NULL) != ltests[n].l)
 170       {
 171         printf ("ltests[%d]: %La != %La\n", n,
 172                 strtold (ltests[n].str, NULL), ltests[n].l);
 173         status = 1;
 174       }
 175
 176   status |= long_dbl ();
 177
 178   status |= locale_test ();
 179
 180   return status ? EXIT_FAILURE : EXIT_SUCCESS;
 181 }
 182
 183 static void
 184 expand (dst, c)
 185      char *dst;
 186      register int c;
 187 {
 188   if (isprint (c))
 189     {
 190       dst[0] = c;
 191       dst[1] = '\0';
 192     }
 193   else
 194     (void) sprintf (dst, "%#.3o", (unsigned int) c);
 195 }
 196
 197 static int
 198 long_dbl (void)
 199 {
 200   /* Regenerate this string using
 201
 202      echo '(2^53-1)*2^(1024-53)' | bc | sed 's/\([^\]*\)\\*$/    "\1"/'
 203
 204   */
 205   static const char longestdbl[] =
 206     "17976931348623157081452742373170435679807056752584499659891747680315"
 207     "72607800285387605895586327668781715404589535143824642343213268894641"
 208     "82768467546703537516986049910576551282076245490090389328944075868508"
 209     "45513394230458323690322294816580855933212334827479782620414472316873"
 210     "8177180919299881250404026184124858368";
 211   double d = strtod (longestdbl, NULL);
 212
 213   printf ("strtod (\"%s\", NULL) = %g\n", longestdbl, d);
 214
 215   if (d != 179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321326889464182768467546703537516986049910576551282076245490090389328944075868508455133942304583236903222948165808559332123348274797826204144723168738177180919299881250404026184124858368.000000)
 216     return 1;
 217
 218   return 0;
 219 }
 220
 221 /* Perform a few tests in a locale with thousands separators.  */
 222 static int
 223 locale_test (void)
 224 {
 225   static const struct
 226   {
 227     const char *loc;
 228     const char *str;
 229     double exp;
 230     ptrdiff_t nread;
 231   } tests[] =
 232     {
 233       { "de_DE.UTF-8", "1,5", 1.5, 3 },
 234       { "de_DE.UTF-8", "1.5", 1.0, 1 },
 235       { "de_DE.UTF-8", "1.500", 1500.0, 5 },
 236       { "de_DE.UTF-8", "36.893.488.147.419.103.232", 0x1.0p65, 26 }
 237     };
 238 #define ntests (sizeof (tests) / sizeof (tests[0]))
 239   size_t n;
 240   int result = 0;
 241
 242   puts ("\nLocale tests");
 243
 244   for (n = 0; n < ntests; ++n)
 245     {
 246       double d;
 247       char *endp;
 248
 249       if (setlocale (LC_ALL, tests[n].loc) == NULL)
 250         {
 251           printf ("cannot set locale %s\n", tests[n].loc);
 252           result = 1;
 253           continue;
 254         }
 255
 256       /* We call __strtod_interal here instead of strtod to tests the
 257          handling of grouping.  */
 258       d = __strtod_internal (tests[n].str, &endp, 1);
 259       if (d != tests[n].exp)
 260         {
 261           printf ("strtod(\"%s\") returns %g and not %g\n",
 262                   tests[n].str, d, tests[n].exp);
 263           result = 1;
 264         }
 265       else if (endp - tests[n].str != tests[n].nread)
 266         {
 267           printf ("strtod(\"%s\") read %td bytes and not %td\n",
 268                   tests[n].str, endp - tests[n].str, tests[n].nread);
 269           result = 1;
 270         }
 271     }
 272
 273   if (result == 0)
 274     puts ("all OK");
 275
 276   return result;
 277 }