--- /dev/null
+/* Test of multibyte character I/O.
+ Copyright (C) 2023 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>, 2023. */
+
+#include <config.h>
+
+#include "mbfile.h"
+
+#include <locale.h>
+
+#include "macros.h"
+
+int
+main ()
+{
+ if (setlocale (LC_ALL, "en_US.UTF-8") == NULL)
+ {
+ fprintf (stderr, "Skipping test: English Unicode locale is not installed\n");
+ return 77;
+ }
+
+ mb_file_t mbstdin;
+ mbf_init (mbstdin, stdin);
+ /* The input consists of 4 UTF-8 characters:
+ '$', U+00A5, U+20AC, U+0001F403. */
+ mbf_char_t next;
+
+ mbf_getc (next, mbstdin);
+ ASSERT (!mb_iseof (next));
+ ASSERT (mb_len (next) == 1);
+ ASSERT (mb_iseq (next, 0x0024));
+
+ mbf_getc (next, mbstdin);
+ ASSERT (!mb_iseof (next));
+ ASSERT (mb_len (next) == 2);
+ ASSERT (mb_iseq (next, 0x00A5));
+
+ mbf_getc (next, mbstdin);
+ ASSERT (!mb_iseof (next));
+ ASSERT (mb_len (next) == 3);
+ ASSERT (mb_iseq (next, 0x20AC));
+
+ mbf_getc (next, mbstdin);
+ ASSERT (!mb_iseof (next));
+ ASSERT (mb_len (next) == 4);
+ ASSERT (mb_iseq (next, 0x1F403));
+
+ mbf_getc (next, mbstdin);
+ ASSERT (mb_iseof (next));
+
+ return 0;
+}