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| 1 /* Test for initial conversion state. |
| 2 Copyright (C) 2008-2012 Free Software Foundation, Inc. |
| 3 Written by Bruno Haible <bruno@clisp.org>, 2008. |
| 4 |
| 5 This program is free software: you can redistribute it and/or modify |
| 6 it under the terms of the GNU General Public License as published by |
| 7 the Free Software Foundation; either version 3 of the License, or |
| 8 (at your option) any later version. |
| 9 |
| 10 This program is distributed in the hope that it will be useful, |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 GNU General Public License for more details. |
| 14 |
| 15 You should have received a copy of the GNU General Public License |
| 16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 17 |
| 18 #include <config.h> |
| 19 |
| 20 /* Specification. */ |
| 21 #include <wchar.h> |
| 22 |
| 23 #include "verify.h" |
| 24 |
| 25 #if (defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__ |
| 26 |
| 27 /* On native Windows, 'mbstate_t' is defined as 'int'. */ |
| 28 |
| 29 int |
| 30 mbsinit (const mbstate_t *ps) |
| 31 { |
| 32 return ps == NULL || *ps == 0; |
| 33 } |
| 34 |
| 35 #else |
| 36 |
| 37 /* Platforms that lack mbsinit() also lack mbrlen(), mbrtowc(), mbsrtowcs() |
| 38 and wcrtomb(), wcsrtombs(). |
| 39 We assume that |
| 40 - sizeof (mbstate_t) >= 4, |
| 41 - only stateless encodings are supported (such as UTF-8 and EUC-JP, but |
| 42 not ISO-2022 variants), |
| 43 - for each encoding, the number of bytes for a wide character is <= 4. |
| 44 (This maximum is attained for UTF-8, GB18030, EUC-TW.) |
| 45 We define the meaning of mbstate_t as follows: |
| 46 - In mb -> wc direction, mbstate_t's first byte contains the number of |
| 47 buffered bytes (in the range 0..3), followed by up to 3 buffered bytes. |
| 48 - In wc -> mb direction, mbstate_t contains no information. In other |
| 49 words, it is always in the initial state. */ |
| 50 |
| 51 verify (sizeof (mbstate_t) >= 4); |
| 52 |
| 53 int |
| 54 mbsinit (const mbstate_t *ps) |
| 55 { |
| 56 const char *pstate = (const char *)ps; |
| 57 |
| 58 return pstate == NULL || pstate[0] == 0; |
| 59 } |
| 60 |
| 61 #endif |
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