/* Test for initial conversion state. Copyright (C) 2008-2020 Free Software Foundation, Inc. Written by Bruno Haible <bruno@clisp.org>, 2008. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. */ #include <config.h> /* Specification. */ #include <wchar.h> #include "verify.h" #if GNULIB_defined_mbstate_t /* Platforms that lack mbsinit() also lack mbrlen(), mbrtowc(), mbsrtowcs() and wcrtomb(), wcsrtombs(). We assume that - sizeof (mbstate_t) >= 4, - only stateless encodings are supported (such as UTF-8 and EUC-JP, but not ISO-2022 variants), - for each encoding, the number of bytes for a wide character is <= 4. (This maximum is attained for UTF-8, GB18030, EUC-TW.) We define the meaning of mbstate_t as follows: - In mb -> wc direction, mbstate_t's first byte contains the number of buffered bytes (in the range 0..3), followed by up to 3 buffered bytes. See mbrtowc.c. - In wc -> mb direction, mbstate_t contains no information. In other words, it is always in the initial state. */ verify (sizeof (mbstate_t) >= 4); int mbsinit (const mbstate_t *ps) { const char *pstate = (const char *)ps; return pstate == NULL || pstate[0] == 0; } #else int mbsinit (const mbstate_t *ps) { # if defined _WIN32 && !defined __CYGWIN__ /* Native Windows. */ /* MSVC defines 'mbstate_t' as an 8-byte struct; the first 4 bytes matter. On mingw, 'mbstate_t' is sometimes defined as 'int', sometimes defined as an 8-byte struct, of which the first 4 bytes matter. */ return ps == NULL || *(const unsigned int *)ps == 0; # else /* Minix, HP-UX 11.00, Solaris 2.6, Interix, ... */ /* Maybe this definition works, maybe not... */ return ps == NULL || *(const char *)ps == 0; # endif } #endif