--- /dev/null
+/* Test of conversion of multibyte character to wide character
+ on native Windows in the UTF-8 environment.
+ Copyright (C) 2024 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>, 2024. */
+
+#include <config.h>
+
+#include <wchar.h>
+
+#include <errno.h>
+#include <locale.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "macros.h"
+
+int
+main (void)
+{
+#ifdef _UCRT
+ /* Test that MB_CUR_MAX and mbrtowc() work as expected in a UTF-8 locale. */
+ mbstate_t state;
+ wchar_t wc;
+ size_t ret;
+
+ if (setlocale (LC_ALL, "") == NULL)
+ return 1;
+
+ ASSERT (MB_CUR_MAX >= 4);
+
+ {
+ char input[] = "B\303\274\303\237er"; /* "Büßer" */
+ memset (&state, '\0', sizeof (mbstate_t));
+
+ wc = (wchar_t) 0xBADFACE;
+ ret = mbrtowc (&wc, input, 1, &state);
+ ASSERT (ret == 1);
+ ASSERT (wc == 'B');
+ ASSERT (mbsinit (&state));
+ input[0] = '\0';
+
+ wc = (wchar_t) 0xBADFACE;
+ ret = mbrtowc (&wc, input + 1, 1, &state);
+ ASSERT (ret == (size_t)(-2));
+ ASSERT (wc == (wchar_t) 0xBADFACE);
+ ASSERT (!mbsinit (&state));
+ input[1] = '\0';
+
+ wc = (wchar_t) 0xBADFACE;
+ ret = mbrtowc (&wc, input + 2, 5, &state);
+ ASSERT (ret == 1);
+ ASSERT (wctob (wc) == EOF);
+ ASSERT (wc == 0x00FC);
+ ASSERT (mbsinit (&state));
+ input[2] = '\0';
+
+ /* Test support of NULL first argument. */
+ ret = mbrtowc (NULL, input + 3, 4, &state);
+ ASSERT (ret == 2);
+ ASSERT (mbsinit (&state));
+
+ wc = (wchar_t) 0xBADFACE;
+ ret = mbrtowc (&wc, input + 3, 4, &state);
+ ASSERT (ret == 2);
+ ASSERT (wctob (wc) == EOF);
+ ASSERT (wc == 0x00DF);
+ ASSERT (mbsinit (&state));
+ input[3] = '\0';
+ input[4] = '\0';
+
+ wc = (wchar_t) 0xBADFACE;
+ ret = mbrtowc (&wc, input + 5, 2, &state);
+ ASSERT (ret == 1);
+ ASSERT (wc == 'e');
+ ASSERT (mbsinit (&state));
+ input[5] = '\0';
+
+ wc = (wchar_t) 0xBADFACE;
+ ret = mbrtowc (&wc, input + 6, 1, &state);
+ ASSERT (ret == 1);
+ ASSERT (wc == 'r');
+ ASSERT (mbsinit (&state));
+
+ /* Test some invalid input. */
+ memset (&state, '\0', sizeof (mbstate_t));
+ wc = (wchar_t) 0xBADFACE;
+ ret = mbrtowc (&wc, "\377", 1, &state); /* 0xFF */
+ ASSERT (ret == (size_t)-1);
+ ASSERT (errno == EILSEQ);
+
+ memset (&state, '\0', sizeof (mbstate_t));
+ wc = (wchar_t) 0xBADFACE;
+ ret = mbrtowc (&wc, "\303\300", 2, &state); /* 0xC3 0xC0 */
+ ASSERT (ret == (size_t)-1);
+ ASSERT (errno == EILSEQ);
+
+ memset (&state, '\0', sizeof (mbstate_t));
+ wc = (wchar_t) 0xBADFACE;
+ ret = mbrtowc (&wc, "\343\300", 2, &state); /* 0xE3 0xC0 */
+ ASSERT (ret == (size_t)-1);
+ ASSERT (errno == EILSEQ);
+
+ memset (&state, '\0', sizeof (mbstate_t));
+ wc = (wchar_t) 0xBADFACE;
+ ret = mbrtowc (&wc, "\343\300\200", 3, &state); /* 0xE3 0xC0 0x80 */
+ ASSERT (ret == (size_t)-1);
+ ASSERT (errno == EILSEQ);
+
+ memset (&state, '\0', sizeof (mbstate_t));
+ wc = (wchar_t) 0xBADFACE;
+ ret = mbrtowc (&wc, "\343\200\300", 3, &state); /* 0xE3 0x80 0xC0 */
+ ASSERT (ret == (size_t)-1);
+ ASSERT (errno == EILSEQ);
+
+ memset (&state, '\0', sizeof (mbstate_t));
+ wc = (wchar_t) 0xBADFACE;
+ ret = mbrtowc (&wc, "\363\300", 2, &state); /* 0xF3 0xC0 */
+ ASSERT (ret == (size_t)-1);
+ ASSERT (errno == EILSEQ);
+
+ memset (&state, '\0', sizeof (mbstate_t));
+ wc = (wchar_t) 0xBADFACE;
+ ret = mbrtowc (&wc, "\363\300\200\200", 4, &state); /* 0xF3 0xC0 0x80 0x80 */
+ ASSERT (ret == (size_t)-1);
+ ASSERT (errno == EILSEQ);
+
+ memset (&state, '\0', sizeof (mbstate_t));
+ wc = (wchar_t) 0xBADFACE;
+ ret = mbrtowc (&wc, "\363\200\300", 3, &state); /* 0xF3 0x80 0xC0 */
+ ASSERT (ret == (size_t)-1);
+ ASSERT (errno == EILSEQ);
+
+ memset (&state, '\0', sizeof (mbstate_t));
+ wc = (wchar_t) 0xBADFACE;
+ ret = mbrtowc (&wc, "\363\200\300\200", 4, &state); /* 0xF3 0x80 0xC0 0x80 */
+ ASSERT (ret == (size_t)-1);
+ ASSERT (errno == EILSEQ);
+
+ memset (&state, '\0', sizeof (mbstate_t));
+ wc = (wchar_t) 0xBADFACE;
+ ret = mbrtowc (&wc, "\363\200\200\300", 4, &state); /* 0xF3 0x80 0x80 0xC0 */
+ ASSERT (ret == (size_t)-1);
+ ASSERT (errno == EILSEQ);
+ }
+
+ return test_exit_status;
+#else
+ fputs ("Skipping test: not using the UCRT runtime\n", stderr);
+ return 77;
+#endif
+}