1 /* Test whether a character is a blank. 2 3 Copyright (C) 2009-2021 Free Software Foundation, Inc. 4 5 This file is free software: you can redistribute it and/or modify 6 it under the terms of the GNU Lesser General Public License as 7 published by the Free Software Foundation; either version 2.1 of the 8 License, or (at your option) any later version. 9 10 This file 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 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser 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 23 int 24 isblank (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 }