root/maint/gnulib/tests/test-yesno.c

/* */

DEFINITIONS

1. main

   1 /* Test of yesno module.
   2    Copyright (C) 2007-2021 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, or (at your option)
   7    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 <https://www.gnu.org/licenses/>.
  16 */
  17 
  18 #include <config.h>
  19 
  20 /* Specification.  */
  21 #include "yesno.h"
  22 
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26 
  27 #include "closein.h"
  28 #include "binary-io.h"
  29 
  30 /* Test yesno.  Without arguments, read one line.  If first argument
  31    is zero, close stdin before attempting to read one line.
  32    Otherwise, read the number of lines specified by first
  33    argument.  */
  34 int
  35 main (int argc, char **argv)
     /*  */
  36 {
  37   int i = 1;
  38 
  39   /* yesno recommends that all clients use close_stdin in main.  */
  40   atexit (close_stdin);
  41   /* But on mingw, close_stdin leaves stdin's file descriptor at the expected
  42      position (i.e. where this program left off reading) only if its mode has
  43      been set to O_BINARY.  If it has been set to O_TEXT, and the file
  44      descriptor is seekable, and stdin is buffered, the MSVCRT runtime ends up
  45      setting the file descriptor's position to the expected position _minus_
  46      the number of LFs not preceded by CR that were read between the expected
  47      position and the last filled buffer end position.  (I.e. the repositioning
  48      from the end-of-buffer to the expected position does not work if the input
  49      file contains end-of-line markers in Unix convention.)  */
  50   set_binary_mode (0, O_BINARY);
  51 
  52   if (1 < argc)
  53     i = atoi (argv[1]);
  54   if (!i)
  55     {
  56       i = 1;
  57       close (0);
  58     }
  59   while (i--)
  60     puts (yesno () ? "Y" : "N");
  61   return 0;
  62 }

/* */