gsasl  1.10.0
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mbsinit.c
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1 /* Test for initial conversion state.
2  Copyright (C) 2008-2021 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 <https://www.gnu.org/licenses/>. */
17 
18 #include <config.h>
19 
20 /* Specification. */
21 #include <wchar.h>
22 
23 #include "verify.h"
24 
25 #if GNULIB_defined_mbstate_t
26 
27 /* Platforms that lack mbsinit() also lack mbrlen(), mbrtowc(), mbsrtowcs()
28  and wcrtomb(), wcsrtombs().
29  We assume that
30  - sizeof (mbstate_t) >= 4,
31  - only stateless encodings are supported (such as UTF-8 and EUC-JP, but
32  not ISO-2022 variants),
33  - for each encoding, the number of bytes for a wide character is <= 4.
34  (This maximum is attained for UTF-8, GB18030, EUC-TW.)
35  We define the meaning of mbstate_t as follows:
36  - In mb -> wc direction, mbstate_t's first byte contains the number of
37  buffered bytes (in the range 0..3), followed by up to 3 buffered bytes.
38  See mbrtowc.c.
39  - In wc -> mb direction, mbstate_t contains no information. In other
40  words, it is always in the initial state. */
41 
42 verify (sizeof (mbstate_t) >= 4);
43 
44 int
45 mbsinit (const mbstate_t *ps)
46 {
47  const char *pstate = (const char *)ps;
48 
49  return pstate == NULL || pstate[0] == 0;
50 }
51 
52 #else
53 
54 int
55 mbsinit (const mbstate_t *ps)
56 {
57 # if defined _WIN32 && !defined __CYGWIN__
58  /* Native Windows. */
59  /* MSVC defines 'mbstate_t' as an 8-byte struct; the first 4 bytes matter.
60  On mingw, 'mbstate_t' is sometimes defined as 'int', sometimes defined as
61  an 8-byte struct, of which the first 4 bytes matter. */
62  return ps == NULL || *(const unsigned int *)ps == 0;
63 # else
64  /* Minix, HP-UX 11.00, Solaris 2.6, Interix, ... */
65  /* Maybe this definition works, maybe not... */
66  return ps == NULL || *(const char *)ps == 0;
67 # endif
68 }
69 
70 #endif
#define NULL
Definition: stddef.in.h:72
#define verify(R)
Definition: verify.h:289
#define mbstate_t
Definition: wchar.in.h:143
char * pstate
Definition: mbrtowc-impl.h:22
int mbsinit(const mbstate_t *ps)
Definition: mbsinit.c:55