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sortix--sortix/libc/freopen.cpp

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2013-03-20 17:20:22 -04:00
/*******************************************************************************
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/>.
freopen.cpp
Changes the file with which a FILE is associated.
*******************************************************************************/
#include <errno.h>
#include <stdio.h>
#include "fdio.h"
extern "C" FILE* freopen(const char* path, const char* mode, FILE* fp)
{
// If no path is given, simply try to change the mode of the file.
if ( !path )
{
// TODO: Determine whether the file should be closed in case we fail
// here to change the mode. A quick look at POSIX doesn't mention that
// it should be closed, so we'll assume it shouldn't!
if ( !fp->reopen_func )
return errno = EBADF, (FILE*) NULL;
if ( !fp->reopen_func(fp->user, mode) )
return NULL;
return fp;
}
// Uninstall the current backend of the FILE (after flushing) and return the
// FILE to the default state (like a new object from fnewfile).
fshutdown(fp);
// Attempt to open the new path and install that into our FILE object.
if ( fdio_install_path(fp, path, mode) != 0 )
{
fclose(fp);
return NULL;
}
return fp;
}