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sortix--sortix/libc/wchar/btowc.cpp
Jonas 'Sortie' Termansen d6067f9da7 Add btowc(3) and wctob(3).
2014-11-25 17:48:54 +01:00

44 lines
1.4 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2014.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
wchar/btowc.cpp
Single byte to wide character conversion.
*******************************************************************************/
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <wchar.h>
extern "C" wint_t btowc(int ic)
{
if ( ic == EOF )
return WEOF;
unsigned char uc = (unsigned char) ic;
char c = (char) uc;
mbstate_t ps;
memset(&ps, 0, sizeof(ps));
wchar_t wc;
int saved_errno = errno;
size_t status = mbrtowc(&wc, (const char*) &c, 1, &ps);
if ( status == (size_t) -1 || status == (size_t) -2 )
return errno = saved_errno, WEOF;
return (wint_t) wc;
}