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8690e634 | 1 | /* Test for initial conversion state. |
49e4877c | 2 | Copyright (C) 2008-2016 Free Software Foundation, Inc. |
8690e634 JK |
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 |