tests/test-isblank.c

   1 /* Test of isblank() function.
   2    Copyright (C) 2009-2024 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 ()
  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 test_exit_status;
  50 }