1 files changed, 166 insertions, 0 deletions
diff --git a/tests/test-mbrtowc-w32utf8.c b/tests/test-mbrtowc-w32utf8.c
new file mode 100644
index 00000000..b2501660
--- /dev/null
+++ b/tests/test-mbrtowc-w32utf8.c
@@ -0,0 +1,166 @@
+/* Test of conversion of multibyte character to wide character
+   on native Windows in the UTF-8 environment.
+   Copyright (C) 2024-2025 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
+}