/* @(#)fileread.c	1.8 97/04/20 Copyright 1986 J. Schilling *//* *	Copyright (c) 1986 J. Schilling *//* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * This program 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 General Public License for more details. *  * You should have received a copy of the GNU General Public License * along with this program; see the file COPYING.  If not, write to * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */#include <stdio.h>#include <errno.h>#include "io.h"static	char	_readerr[]	= "file_read_err";#ifdef	HAVE_USG_STDIOint fileread(f, buf, len)	register FILE	*f;	void	*buf;	int	len;{	int	cnt;	register int	n;	down2(f, _IOREAD, _IORW);	if (f->_flag & _IONBF){		cnt = _niread (fileno(f), buf, len);		if (cnt < 0) {			f->_flag |= _IOERR;			if (!(my_flag(f) & _IONORAISE))				raisecond(_readerr, 0L);		}		if (cnt == 0 && len)			f->_flag |= _IOEOF;		return cnt;	}	cnt = 0;	while (len > 0) {		if (f->_cnt <= 0){			if (_filbuf(f) == EOF)				break;			f->_cnt++;			f->_ptr--;		}		n = f->_cnt >= len ? len : f->_cnt;		buf = (void *)movebytes (f->_ptr, buf, n);		f->_ptr += n;		f->_cnt -= n;		cnt += n;		len -= n;	}	if (!ferror(f))		return cnt;	if (!(my_flag(f) & _IONORAISE))		raisecond(_readerr, 0L);	return -1;}#elseint fileread(f, buf, len)	register FILE	*f;	void	*buf;	int	len;{	int	cnt;	down2(f, _IOREAD, _IORW);	if (my_flag(f) & _IOUNBUF)		return _niread(fileno(f), buf, len);	cnt = fread(buf, 1, len, f);	if (!ferror(f))		return cnt;	if (!(my_flag(f) & _IONORAISE))		raisecond(_readerr, 0L);	return -1;}#endif	/* HAVE_USG_STDIO */