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sortix--sortix/libc/fregister.cpp
2013-12-17 14:30:23 +01:00

46 lines
1.6 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
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/>.
fregister.cpp
Registers a FILE in the global list of open FILES, which allows the standard
library to close and flush all open files upon program exit.
*******************************************************************************/
#include <stdio.h>
extern "C" { FILE* _firstfile = NULL; }
extern "C" void fregister(FILE* fp)
{
fp->flags |= _FILE_REGISTERED;
if ( !_firstfile ) { _firstfile = fp; return; }
fp->next = _firstfile;
_firstfile->prev = fp;
_firstfile = fp;
}
extern "C" void funregister(FILE* fp)
{
if ( !(fp->flags & _FILE_REGISTERED) ) { return; }
if ( !fp->prev ) { _firstfile = fp->next; }
if ( fp->prev ) { fp->prev->next = fp->next; }
if ( fp->next ) { fp->next->prev = fp->prev; }
fp->flags &= ~_FILE_REGISTERED;
}