| /* Test for initial conversion state. |
| Copyright (C) 2008-2016 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 |