rdfe.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

#ifndef lint
static char	*sccsid = " @(#)rdfe.c	4.1	(ULTRIX)	7/17/90";
#endif lint

/************************************************************************
 *									*
 *			Copyright (c) 1986 by				*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any  other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived  from  software  received  from  the	*
 *   University    of   California,   Berkeley,   and   from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is  subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or  reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/

/************************************************************************
*
*			Modification History
*
*	David Metsky		10-Jan-86
*
* 001	Added from BSD 4.3 version as part of upgrade.
*
*	Based on:	rdfe.c		5.1		6/7/85
*
*************************************************************************/

/*
 * read direct formatted external i/o
 */

#include "fio.h"

extern int rd_ed(),rd_ned();
int y_getc(),y_rnew(),y_tab();

LOCAL char rdfe[] = "read dfe";

s_rdfe(a) cilist *a;
{
	int n;
	reading = YES;
	if(n=c_dfe(a,READ,rdfe)) return(n);
	if(curunit->uwrt && ! nowreading(curunit)) err(errflag, errno, rdfe)
	getn = y_getc;
	doed = rd_ed;
	doned = rd_ned;
	dotab = y_tab;
	dorevert = doend = donewrec = y_rnew;
	if(pars_f()) err(errflag,F_ERFMT,rdfe)
	fmt_bg();
	return(OK);
}

e_rdfe()
{
	en_fio();
	return(OK);
}

LOCAL
y_getc()
{
	int ch;
	if(curunit->uend) return(EOF);
	if(curunit->url==1 || recpos++ < curunit->url)
	{
		if((ch=getc(cf))!=EOF)
		{
				return(ch);
		}
		if(feof(cf))
		{
			curunit->uend = YES;
			return(EOF);
		}
		err(errflag,errno,rdfe);
	}
	else return(' ');
}

/*
/*y_rev()
/*{	/*what about work done?*/
/*	if(curunit->url==1) return(0);
/*	while(recpos<curunit->url) (*putn)(' ');
/*	recpos=0;
/*	return(0);
/*}
/*
/*y_err()
/*{
/*	err(errflag, F_EREREC, rdfe+5);
/*}
*/

LOCAL
y_rnew()
{	if(curunit->url != 1)
	{	fseek(cf,(long)curunit->url*(++recnum),0);
		recpos = reclen = cursor = 0;
	}
	return(OK);
}