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+/* Test of isblank() function.
+ Copyright (C) 2009-2022 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/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2009. */
+
+#include <config.h>
+
+#include <ctype.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (isblank, int, (int));
+
+#include <limits.h>
+#include <stdio.h>
+
+#include "macros.h"
+
+int
+main (int argc, char *argv[])
+{
+ unsigned int c;
+
+ /* Verify the property in the "C" locale.
+ POSIX specifies in
+ <https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap07.html>
+ that
+ - in all locales, the blank characters include the <space> and <tab>
+ characters,
+ - in the "POSIX" locale (which is usually the same as the "C" locale),
+ the blank characters include only the ASCII <space> and <tab>
+ characters. */
+ for (c = 0; c <= UCHAR_MAX; c++)
+ ASSERT (!isblank (c) == !(c == ' ' || c == '\t'));
+ ASSERT (!isblank (EOF));
+
+ return 0;
+}