1 /* Test of isblank() function. 2 Copyright (C) 2009-2021 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 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 }