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sortix--sortix/libc/fshutdown.cpp

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/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013.
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/>.
fshutdown.cpp
Uninstalls the backend from a FILE so another can be reinstalled.
*******************************************************************************/
#include <stdio.h>
#include <stdlib.h>
extern "C" int fshutdown(FILE* fp)
{
int ret = fflush(fp);
if ( ret )
{
/* TODO: How to report errors here? fclose may need us to return its
exact error value, for instance, as with popen/pclose. */;
}
ret = fp->close_func ? fp->close_func(fp->user) : ret;
if ( fp->flags & _FILE_BUFFER_OWNED )
free(fp->buffer);
// Resetting the FILE here isn't needed in the case where fclose calls us,
// but it's nice to zero it out anyway (avoiding state) data, and it's a
// feature when called by freopen that wishes to reuse the FILE. It also
// means that the file is always in a consistent state.
fresetfile(fp);
return ret;
}