stdlib/tst-strtod.c

   1 /* Copyright (C) 1991, 1996 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     { NULL, 0, '\0', 0 }
  42   };
  43
  44 static void expand __P ((char *dst, int c));
  45
  46 int
  47 main (int argc, char ** argv)
  48 {
  49   register const struct ltest *lt;
  50   char *ep;
  51   int status = 0;
  52
  53   for (lt = tests; lt->str != NULL; ++lt)
  54     {
  55       double d;
  56
  57       errno = 0;
  58       d = strtod(lt->str, &ep);
  59       printf("strtod(\"%s\") test %u",
  60              lt->str, (unsigned int) (lt - tests));
  61       if (d == lt->expect && *ep == lt->left && errno == lt->err)
  62         puts("\tOK");
  63       else
  64         {
  65           puts("\tBAD");
  66           if (d != lt->expect)
  67             printf("  returns %.60g, expected %.60g\n", d, lt->expect);
  68           if (lt->left != *ep)
  69             {
  70               char exp1[5], exp2[5];
  71               expand(exp1, *ep);
  72               expand(exp2, lt->left);
  73               printf("  leaves '%s', expected '%s'\n", exp1, exp2);
  74             }
  75           if (errno != lt->err)
  76             printf("  errno %d (%s)  instead of %d (%s)\n",
  77                    errno, strerror(errno), lt->err, strerror(lt->err));
  78           status = 1;
  79         }
  80     }
  81
  82   exit(status ? EXIT_FAILURE : EXIT_SUCCESS);
  83 }
  84
  85 static void
  86 expand (dst, c)
  87      char *dst;
  88      register int c;
  89 {
  90   if (isprint(c))
  91     {
  92       dst[0] = c;
  93       dst[1] = '\0';
  94     }
  95   else
  96     (void) sprintf(dst, "%#.3o", (unsigned int) c);
  97 }