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nagios-plugins  1.4.16
mbsinit.c
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00001 /* Test for initial conversion state.
00002    Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.
00003    Written by Bruno Haible <bruno@clisp.org>, 2008.
00004 
00005    This program is free software: you can redistribute it and/or modify
00006    it under the terms of the GNU General Public License as published by
00007    the Free Software Foundation; either version 3 of the License, or
00008    (at your option) any later version.
00009 
00010    This program is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013    GNU General Public License for more details.
00014 
00015    You should have received a copy of the GNU General Public License
00016    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
00017 
00018 #include <config.h>
00019 
00020 /* Specification.  */
00021 #include <wchar.h>
00022 
00023 #include "verify.h"
00024 
00025 /* Platforms that lack mbsinit() also lack mbrlen(), mbrtowc(), mbsrtowcs()
00026    and wcrtomb(), wcsrtombs().
00027    We assume that
00028      - sizeof (mbstate_t) >= 4,
00029      - only stateless encodings are supported (such as UTF-8 and EUC-JP, but
00030        not ISO-2022 variants),
00031      - for each encoding, the number of bytes for a wide character is <= 4.
00032        (This maximum is attained for UTF-8, GB18030, EUC-TW.)
00033    We define the meaning of mbstate_t as follows:
00034      - In mb -> wc direction, mbstate_t's first byte contains the number of
00035        buffered bytes (in the range 0..3), followed by up to 3 buffered bytes.
00036      - In wc -> mb direction, mbstate_t contains no information. In other
00037        words, it is always in the initial state.  */
00038 
00039 verify (sizeof (mbstate_t) >= 4);
00040 
00041 int
00042 mbsinit (const mbstate_t *ps)
00043 {
00044   const char *pstate = (const char *)ps;
00045 
00046   return pstate[0] == 0;
00047 }