/* $NetBSD: fileext.h,v 1.7 2022/04/19 20:32:15 rillig Exp $ */

/*-
 * Copyright (c)2001 Citrus Project,
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $Citrus$
 */

/*
 * file extension
 */
struct __sfileext {
	struct	__sbuf _ub; /* ungetc buffer */
	struct wchar_io_data _wcio;	/* wide char i/o status */
	size_t _fgetstr_len;
	char *_fgetstr_buf;
#ifdef _REENTRANT
	mutex_t	_lock;	/* Lock for FLOCKFILE/FUNLOCKFILE */
	cond_t _lockcond; /* Condition variable for signalling lock releases */
	thr_t _lockowner; /* The thread currently holding the lock */
	int _lockcount; /* Count of recursive locks */
	int _lockinternal; /* Flag of whether the lock is held inside stdio */
	int _lockcancelstate; /* Stashed cancellation state on internal lock */
#endif	
};

#define _EXT(fp) ((struct __sfileext *)(void *)((fp)->_ext._base))
#define _UB(fp) _EXT(fp)->_ub
#ifdef _REENTRANT
#define _LOCK(fp) (_EXT(fp)->_lock)
#define _LOCKCOND(fp) (_EXT(fp)->_lockcond)
#define _LOCKOWNER(fp) (_EXT(fp)->_lockowner)
#define _LOCKCOUNT(fp) (_EXT(fp)->_lockcount)
#define _LOCKINTERNAL(fp) (_EXT(fp)->_lockinternal)
#define _LOCKCANCELSTATE(fp) (_EXT(fp)->_lockcancelstate)
#define _FILEEXT_SETUP(f, fext) do { \
	/* LINTED */(f)->_ext._base = (unsigned char *)(fext); \
	(fext)->_fgetstr_len = 0; \
	(fext)->_fgetstr_buf = NULL; \
	mutex_init(&_LOCK(f), NULL); \
	cond_init(&_LOCKCOND(f), 0, NULL); \
	_LOCKOWNER(f) = NULL; \
	_LOCKCOUNT(f) = 0; \
	_LOCKINTERNAL(f) = 0; \
	} while (0)
#else
#define _FILEEXT_SETUP(f, fext) do { \
	/* LINTED */(f)->_ext._base = (unsigned char *)(fext); \
	(fext)->_fgetstr_len = 0; \
	(fext)->_fgetstr_buf = NULL; \
	} while (0)
#endif