/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * Copyright (c) 1993, 1994 Chris Provenzano. 
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Chris Torek.
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
/*static char *sccsid = "from: @(#)stdio.c	5.3 (Berkeley) 2/24/91";*/
static char *rcsid = "$Id$";
#endif /* LIBC_SCCS and not lint */

#include <pthread.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include "local.h"

/*
 * Small standard I/O/seek/close functions.
 * These maintain the `known seek offset' for seek optimisation.
 */
int __sread(FILE  *fp, char *buf, int n)
{
	register int ret;
	
	/* if the read succeeded, update the current offset */
	if (fd_table[fp->_file]->ops->use_kfds < 2) {
		ret = fd_table[fp->_file]->ops->read(fd_table[fp->_file]->fd,
	  	  fd_table[fp->_file]->flags, buf, n, NULL);
	} else {
		pthread_ssize_t (*readfn)() = fd_table[fp->_file]->ops->read;
		ret = readfn(fd_table[fp->_file]->fd, buf, n);
	}
	if (ret >= 0) {
		fp->_offset += ret;
	} else {
		fp->_flags &= ~__SOFF;	/* paranoia */
	}
	return (ret);
}

int __swrite(FILE *fp, const char *buf, int n)
{
	if (fp->_flags & __SAPP)
		(void) lseek(fp->_file, (off_t)0, SEEK_END);
	fp->_flags &= ~__SOFF;	/* in case FAPPEND mode is set */
	if (fd_table[fp->_file]->ops->use_kfds < 2) {
		return(fd_table[fp->_file]->ops->write(fd_table[fp->_file]->fd,
		  fd_table[fp->_file]->flags, buf, n, NULL));
	} else {
		pthread_ssize_t (*writefn)() = fd_table[fp->_file]->ops->write;
		return(writefn(fd_table[fp->_file]->fd,buf,n));
	}
}

fpos_t __sseek(FILE *fp, off_t offset, int whence)
{
	register fpos_t ret;
	
	ret = (fpos_t)lseek(fp->_file, offset, whence);
	if (ret == -1L)
		fp->_flags &= ~__SOFF;
	else {
		fp->_flags |= __SOFF;
		fp->_offset = ret;
	}
	return (ret);
}

int __sclose(FILE *fp)
{
	return (close(fp->_file));
}
