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1 /* Test whether a character is a blank.
3 Copyright (C) 2009-2018 Free Software Foundation, Inc.
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.
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.
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/>. */
18 #include <config.h>
20 /* Specification. */
21 #include <ctype.h>
24 isblank (int c)
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');