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