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