+
−/* Test for initial conversion state.
+
−   Copyright (C) 2008-2013 Free Software Foundation, Inc.
+
−   Written by Bruno Haible <bruno@clisp.org>, 2008.
+
−
+
−   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 <http://www.gnu.org/licenses/>.  */
+
−
+
−#include <config.h>
+
−
+
−/* Specification.  */
+
−#include <wchar.h>
+
−
+
−#include "verify.h"
+
−
+
−#if (defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__
+
−
+
−/* On native Windows, 'mbstate_t' is defined as 'int'.  */
+
−
+
−int
+
−mbsinit (const mbstate_t *ps)
+
−{
+
−  return ps == NULL || *ps == 0;
+
−}
+
−
+
−#else
+
−
+
−/* Platforms that lack mbsinit() also lack mbrlen(), mbrtowc(), mbsrtowcs()
+
−   and wcrtomb(), wcsrtombs().
+
−   We assume that
+
−     - sizeof (mbstate_t) >= 4,
+
−     - only stateless encodings are supported (such as UTF-8 and EUC-JP, but
+
−       not ISO-2022 variants),
+
−     - for each encoding, the number of bytes for a wide character is <= 4.
+
−       (This maximum is attained for UTF-8, GB18030, EUC-TW.)
+
−   We define the meaning of mbstate_t as follows:
+
−     - In mb -> wc direction, mbstate_t's first byte contains the number of
+
−       buffered bytes (in the range 0..3), followed by up to 3 buffered bytes.
+
−     - In wc -> mb direction, mbstate_t contains no information. In other
+
−       words, it is always in the initial state.  */
+
−
+
−verify (sizeof (mbstate_t) >= 4);
+
−
+
−int
+
−mbsinit (const mbstate_t *ps)
+
−{
+
−  const char *pstate = (const char *)ps;
+
−
+
−  return pstate == NULL || pstate[0] == 0;
+
−}
+
−
+
−#endif