tests/data/inexactify.c

   1 /* PSPP - a program for statistical analysis.
   2    Copyright (C) 2006, 2010 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program 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
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>. */
  16
  17 #include <config.h>
  18
  19 #include <ctype.h>
  20 #include <stdbool.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 /* Replaces insignificant digits by # to facilitate textual
  26    comparisons.  Not a perfect solution to the general-purpose
  27    comparison problem, because rounding that affects earlier
  28    digits can still cause differences. */
  29 int
  30 main (void)
  31 {
  32   bool in_quotes = false;
  33   bool in_exponent = false;
  34   int digits = 0;
  35
  36   for (;;)
  37     {
  38       int c = getchar ();
  39       if (c == EOF)
  40         break;
  41       else if (c == '\n')
  42         in_quotes = false;
  43       else if (c == '"')
  44         {
  45           in_quotes = !in_quotes;
  46           in_exponent = false;
  47           digits = 0;
  48         }
  49       else if (in_quotes && !in_exponent)
  50         {
  51           if (strchr ("+dDeE", c) != NULL || (c == '-' && digits))
  52             in_exponent = true;
  53           else if (strchr ("0123456789}JKLMNOPQR", c) != NULL)
  54             {
  55               if (digits || c >= '1')
  56                 digits++;
  57               if (digits > 13)
  58                 c = isdigit (c) ? '#' : '@';
  59             }
  60         }
  61       putchar (c);
  62     }
  63   return EXIT_SUCCESS;
  64 }