mbstoc32s: New module.

* lib/uchar.in.h (mbstoc32s): New declaration.
* lib/mbstoc32s.c: New file.
* m4/uchar.m4 (gl_UCHAR_H_DEFAULTS): Initialize GNULIB_MBSTOC32S.
* modules/uchar (Makefile.am): Substitute GNULIB_MBSTOC32S.
* modules/mbstoc32s: New file.
* tests/test-uchar-c++.cc: Test the signature of mbstoc32s.
* doc/posix-functions/mbstowcs.texi: Mention the new module.

1 files changed, 33 insertions, 0 deletions

diff --git a/lib/mbstoc32s.c b/lib/mbstoc32s.c
new file mode 100644
index 0000000000..ede2786628
--- /dev/null
+++ b/lib/mbstoc32s.c
@@ -0,0 +1,33 @@
+/* Convert string to 32-bit wide string.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2020.
+
+   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 <uchar.h>
+
+#include <string.h>
+#include <wchar.h>
+
+size_t
+mbstoc32s (char32_t *dest, const char *src, size_t len)
+{
+  mbstate_t state;
+
+  memset (&state, '\0', sizeof (mbstate_t));
+  return mbsrtoc32s (dest, &src, len, &state);
+}