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sortix--sortix/libc/stdio/fresetfile.cpp
Jonas 'Sortie' Termansen 3778dae725 Remove __fsetlocking(3).
2014-12-01 21:39:05 +01:00

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1.8 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 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/>.
stdio/fresetfile.cpp
After a FILE has been shut down, returns all fields to their default state.
*******************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// Note: This function preserves a few parts of the fields - this means that if
// you are using this to reset a fresh FILE object, you should memset it
// to zeroes first to avoid problems.
extern "C" void fresetfile(FILE* fp)
{
FILE* prev = fp->prev;
FILE* next = fp->next;
void* free_user = fp->free_user;
void (*free_func)(void*, FILE*) = fp->free_func;
int kept_flags = fp->flags & (_FILE_REGISTERED | 0);
memset(fp, 0, sizeof(*fp));
fp->file_lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
fp->flags = kept_flags;
fp->buffer_mode = -1;
fp->free_user = free_user;
fp->free_func = free_func;
fp->prev = prev;
fp->next = next;
}