1/* Test whether a character is a blank.
2
3   Copyright (C) 2009-2020 Free Software Foundation, Inc.
4
5   This program is free software: you can redistribute it and/or modify
6   it under the terms of the GNU General Public License as published by
7   the Free Software Foundation; either version 3 of the License, or
8   (at your option) any later version.
9
10   This program is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13   GNU General Public License for more details.
14
15   You should have received a copy of the GNU General Public License
16   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
17
18#include <config.h>
19
20/* Specification.  */
21#include <ctype.h>
22
23int
24isblank (int c)
25{
26  /* On all known platforms, in all predefined locales, isblank(c) is likely
27     equivalent with  (c == ' ' || c == '\t').  Look at the glibc definition
28     (in glibc/localedata/locales/i18n): The "blank" characters are '\t', ' ',
29     U+1680, U+180E, U+2000..U+2006, U+2008..U+200A, U+205F, U+3000, and none
30     except the first two is present in a common 8-bit encoding.  Therefore
31     the substitute for other platforms is not more complicated than this.  */
32  return (c == ' ' || c == '\t');
33}
34