mbsrtoc32s: New module.

* lib/uchar.in.h (mbsrtoc32s): New declaration.
* lib/mbsrtowcs-impl.h: Parameterize: Use macros FUNC, DCHAR_T,
INTERNAL_STATE, MBRTOWC.
* lib/mbsrtowcs.c (FUNC, DCHAR_T, INTERNAL_STATE, MBRTOWC): New macros.
* lib/mbsrtoc32s.c: New file.
* lib/mbsrtoc32s-state.c: New file, based on lib/mbsrtowcs-state.c.
* m4/uchar.m4 (gl_UCHAR_H_DEFAULTS): Initialize GNULIB_MBSRTOC32S.
* modules/uchar (Makefile.am): Substitute GNULIB_MBSRTOC32S.
* modules/mbsrtoc32s: New file.
* tests/test-uchar-c++.cc: Test the signature of mbsrtoc32s.
* doc/posix-functions/mbsrtowcs.texi: Mention the new module.

1 files changed, 54 insertions, 0 deletions

diff --git a/lib/mbsrtoc32s.c b/lib/mbsrtoc32s.c
new file mode 100644
index 0000000000..432ffaf08e
--- /dev/null
+++ b/lib/mbsrtoc32s.c
@@ -0,0 +1,54 @@
+/* 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 <wchar.h>
+
+#if _GL_LARGE_CHAR32_T
+
+# include <errno.h>
+# include <limits.h>
+# include <stdlib.h>
+
+# include "strnlen1.h"
+
+extern mbstate_t _gl_mbsrtoc32s_state;
+
+# define FUNC mbsrtoc32s
+# define DCHAR_T char32_t
+# define INTERNAL_STATE _gl_mbsrtoc32s_state
+# define MBRTOWC mbrtoc32
+# include "mbsrtowcs-impl.h"
+
+#else
+/* char32_t and wchar_t are equivalent.  */
+
+# include "verify.h"
+
+verify (sizeof (char32_t) == sizeof (wchar_t));
+
+size_t
+mbsrtoc32s (char32_t *dest, const char **srcp, size_t len, mbstate_t *ps)
+{
+  return mbsrtowcs ((wchar_t *) dest, srcp, len, ps);
+}
+
+#endif