stdlib/tst-strtod.c

   1 /* Copyright (C) 1991, 1996, 1997, 1998 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     { NULL, 0, '\0', 0 }
  43   };
  44
  45 static void expand __P ((char *dst, int c));
  46
  47 int
  48 main (int argc, char ** argv)
  49 {
  50   char buf[100];
  51   register const struct ltest *lt;
  52   char *ep;
  53   int status = 0;
  54   int save_errno;
  55
  56   for (lt = tests; lt->str != NULL; ++lt)
  57     {
  58       double d;
  59
  60       errno = 0;
  61       d = strtod(lt->str, &ep);
  62       save_errno = errno;
  63       printf ("strtod (\"%s\") test %u",
  64              lt->str, (unsigned int) (lt - tests));
  65       if (d == lt->expect && *ep == lt->left && save_errno == lt->err)
  66         puts ("\tOK");
  67       else
  68         {
  69           puts ("\tBAD");
  70           if (d != lt->expect)
  71             printf ("  returns %.60g, expected %.60g\n", d, lt->expect);
  72           if (lt->left != *ep)
  73             {
  74               char exp1[5], exp2[5];
  75               expand (exp1, *ep);
  76               expand (exp2, lt->left);
  77               printf ("  leaves '%s', expected '%s'\n", exp1, exp2);
  78             }
  79           if (save_errno != lt->err)
  80             printf ("  errno %d (%s)  instead of %d (%s)\n",
  81                     save_errno, strerror (save_errno),
  82                     lt->err, strerror (lt->err));
  83           status = 1;
  84         }
  85     }
  86
  87   sprintf (buf, "%f", strtod ("-0.0", NULL));
  88   if (strcmp (buf, "-0.000000") != 0)
  89     {
  90       printf ("  strtod (\"-0.0\', NULL) returns \"%s\"\n", buf);
  91       status = 1;
  92     }
  93
  94   exit (status ? EXIT_FAILURE : EXIT_SUCCESS);
  95 }
  96
  97 static void
  98 expand (dst, c)
  99      char *dst;
 100      register int c;
 101 {
 102   if (isprint (c))
 103     {
 104       dst[0] = c;
 105       dst[1] = '\0';
 106     }
 107   else
 108     (void) sprintf (dst, "%#.3o", (unsigned int) c);
 109 }