1  /* Test of isblank() function.
       2     Copyright (C) 2009-2022 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 <https://www.gnu.org/licenses/>.  */
      16  
      17  /* Written by Bruno Haible <bruno@clisp.org>, 2009.  */
      18  
      19  #include <config.h>
      20  
      21  #include <ctype.h>
      22  
      23  #include "signature.h"
      24  SIGNATURE_CHECK (isblank, int, (int));
      25  
      26  #include <limits.h>
      27  #include <stdio.h>
      28  
      29  #include "macros.h"
      30  
      31  int
      32  main (int argc, char *argv[])
      33  {
      34    unsigned int c;
      35  
      36    /* Verify the property in the "C" locale.
      37       POSIX specifies in
      38         <https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap07.html>
      39       that
      40         - in all locales, the blank characters include the <space> and <tab>
      41           characters,
      42         - in the "POSIX" locale (which is usually the same as the "C" locale),
      43           the blank characters include only the ASCII <space> and <tab>
      44           characters.  */
      45    for (c = 0; c <= UCHAR_MAX; c++)
      46      ASSERT (!isblank (c) == !(c == ' ' || c == '\t'));
      47    ASSERT (!isblank (EOF));
      48  
      49    return 0;
      50  }