stdlib/tst-strtod.c

   1 /* Copyright (C) 1991, 1996, 1997, 1998, 1999 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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    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    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <ctype.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <errno.h>
  23 #include <string.h>
  24
  25 struct ltest
  26   {
  27     const char *str;            /* Convert this.  */
  28     double expect;              /* To get this.  */
  29     char left;                  /* With this left over.  */
  30     int err;                    /* And this in errno.  */
  31   };
  32 static const struct ltest tests[] =
  33   {
  34     { "12.345", 12.345, '\0', 0 },
  35     { "12.345e19", 12.345e19, '\0', 0 },
  36     { "-.1e+9", -.1e+9, '\0', 0 },
  37     { ".125", .125, '\0', 0 },
  38     { "1e20", 1e20, '\0', 0 },
  39     { "0e-19", 0, '\0', 0 },
  40     { "4\00012", 4.0, '\0', 0 },
  41     { "5.9e-76", 5.9e-76, '\0', 0 },
  42     { "0x1.4p+3", 10.0, '\0', 0 },
  43     { "0xAp0", 10.0, '\0', 0 },
  44     { "0x0Ap0", 10.0, '\0', 0 },
  45     { "0x0A", 10.0, '\0', 0 },
  46     { "0xA0", 160.0, '\0', 0 },
  47     { "0x0.A0p8", 160.0, '\0', 0 },
  48     { "0x0.50p9", 160.0, '\0', 0 },
  49     { "0x0.28p10", 160.0, '\0', 0 },
  50     { "0x0.14p11", 160.0, '\0', 0 },
  51     { "0x0.0A0p12", 160.0, '\0', 0 },
  52     { "0x0.050p13", 160.0, '\0', 0 },
  53     { "0x0.028p14", 160.0, '\0', 0 },
  54     { "0x0.014p15", 160.0, '\0', 0 },
  55     { "0x00.00A0p16", 160.0, '\0', 0 },
  56     { "0x00.0050p17", 160.0, '\0', 0 },
  57     { "0x00.0028p18", 160.0, '\0', 0 },
  58     { "0x00.0014p19", 160.0, '\0', 0 },
  59     { NULL, 0, '\0', 0 }
  60   };
  61
  62 static void expand (char *dst, int c);
  63 static int long_dbl (void);
  64
  65 int
  66 main (int argc, char ** argv)
  67 {
  68   char buf[100];
  69   register const struct ltest *lt;
  70   char *ep;
  71   int status = 0;
  72   int save_errno;
  73
  74   for (lt = tests; lt->str != NULL; ++lt)
  75     {
  76       double d;
  77
  78       errno = 0;
  79       d = strtod(lt->str, &ep);
  80       save_errno = errno;
  81       printf ("strtod (\"%s\") test %u",
  82              lt->str, (unsigned int) (lt - tests));
  83       if (d == lt->expect && *ep == lt->left && save_errno == lt->err)
  84         puts ("\tOK");
  85       else
  86         {
  87           puts ("\tBAD");
  88           if (d != lt->expect)
  89             printf ("  returns %.60g, expected %.60g\n", d, lt->expect);
  90           if (lt->left != *ep)
  91             {
  92               char exp1[5], exp2[5];
  93               expand (exp1, *ep);
  94               expand (exp2, lt->left);
  95               printf ("  leaves '%s', expected '%s'\n", exp1, exp2);
  96             }
  97           if (save_errno != lt->err)
  98             printf ("  errno %d (%s)  instead of %d (%s)\n",
  99                     save_errno, strerror (save_errno),
 100                     lt->err, strerror (lt->err));
 101           status = 1;
 102         }
 103     }
 104
 105   sprintf (buf, "%f", strtod ("-0.0", NULL));
 106   if (strcmp (buf, "-0.000000") != 0)
 107     {
 108       printf ("  strtod (\"-0.0\", NULL) returns \"%s\"\n", buf);
 109       status = 1;
 110     }
 111
 112   status |= long_dbl ();
 113
 114   exit (status ? EXIT_FAILURE : EXIT_SUCCESS);
 115 }
 116
 117 static void
 118 expand (dst, c)
 119      char *dst;
 120      register int c;
 121 {
 122   if (isprint (c))
 123     {
 124       dst[0] = c;
 125       dst[1] = '\0';
 126     }
 127   else
 128     (void) sprintf (dst, "%#.3o", (unsigned int) c);
 129 }
 130
 131 static int
 132 long_dbl (void)
 133 {
 134   /* Regenerate this string using
 135
 136      echo '(2^53-1)*2^(1024-53)' | bc | sed 's/\([^\]*\)\\*$/    "\1"/'
 137
 138   */
 139   static const char longestdbl[] =
 140     "17976931348623157081452742373170435679807056752584499659891747680315"
 141     "72607800285387605895586327668781715404589535143824642343213268894641"
 142     "82768467546703537516986049910576551282076245490090389328944075868508"
 143     "45513394230458323690322294816580855933212334827479782620414472316873"
 144     "8177180919299881250404026184124858368";
 145   double d = strtod (longestdbl, NULL);
 146
 147   printf ("strtod (\"%s\", NULL) = %g\n", longestdbl, d);
 148
 149   if (d != 179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321326889464182768467546703537516986049910576551282076245490090389328944075868508455133942304583236903222948165808559332123348274797826204144723168738177180919299881250404026184124858368.000000)
 150     return 1;
 151
 152   return 0;
 153 }