dofio.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

#ifndef lint
static char	*sccsid = " @(#)dofio.c	1.2	(ULTRIX)	1/16/86";
#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	Replaced old version with BSD 4.3 version as part of upgrade.
*
*	Based on:	dofio.c		5.1		6/7/85
*
*************************************************************************/

/*
 * fortran format executer
 */

#include "fio.h"
#include "format.h"

#define DO(x)	if(n=x) err(n>0?errflag:endflag,n,dfio)
#define DO_F(x)	if(n=x) err_f(n>0?errflag:endflag,n,dfio)
#define err_f(f,n,s)	{if(f) return(dof_err(n)); else fatal(n,s);}
#define STKSZ 10
LOCAL int cnt[STKSZ],ret[STKSZ],cp,rp;
LOCAL char *dfio = "dofio";
int used_data;

en_fio()
{	ftnint one=1;
	return(do_fio(&one,NULL,0L));
}

/* OP_TYPE_TAB is defined in format.h,
		  it is NED for X,SLASH,APOS,H,TL,TR,T
		  ED  for I,IM,F,E,EE,D,DE,G,GE,L,A,AW
		  and returns op for other values 
 */
LOCAL int optypes[] = { OP_TYPE_TAB };
LOCAL int rep_count, in_mid;

do_fio(number,ptr,len) ftnint *number; ftnlen len; char *ptr;
{	struct syl *p;
	int n,i,more,optype;
	more = *number;
	for(;;) {
	  if( (optype = ((p= &syl_ptr[pc])->op)) > LAST_TERM )
		err_f(errflag,F_ERFMT,"impossible code");
#ifdef DEBUG
	  fprintf(stderr," pc=%d, cnt[%d]=%d, ret[%d]=%d, op=%d\n",
		pc,cp,cnt[cp],rp,ret[rp],optype); /*for debug*/
#endif
	  switch(optypes[optype])
	  {
	  case NED:
		DO_F((*doned)(p,ptr))
		pc++;
		break;
	  case ED:
		if(in_mid == NO) rep_count = p->rpcnt;
		in_mid = YES;
		while (rep_count > 0 ) {
		    if(ptr==NULL)
		    {	DO((*doend)('\n'))
			return(OK);
		    }
		    if(!more) return(OK);
		    used_data = YES;
		    DO_F((*doed)(p,ptr,len))
		    ptr += len;
		    more--;
		    rep_count--;
		}
		pc++;
		in_mid = NO;
		break;
	  case STACK:		/* repeat count */
		if(++cp==STKSZ) err_f(errflag,F_ERFMT,"too many nested ()")
		cnt[cp]=p->p1;
		pc++;
		break;
	  case RET:		/* open paren */
		if(++rp==STKSZ) err_f(errflag,F_ERFMT,"too many nested ()")
		ret[rp]=p->p1;
		pc++;
		break;
	  case GOTO:		/* close paren */
		if(--cnt[cp]<=0)
		{	cp--;
			rp--;
			pc++;
		}
		else pc = ret[rp--] + 1;
		break;
	  case REVERT:		/* end of format */
		if(ptr==NULL)
		{	DO((*doend)('\n'))
			return(OK);
		}
		if(!more) return(OK);
		if( used_data == NO ) err_f(errflag,F_ERFMT,"\nNo more editing terms in format");
		used_data = NO;
		rp=cp=0;
		pc = p->p1;
		DO((*dorevert)())
		break;
	  case COLON:
#ifndef KOSHER
	  case DOLAR:				/*** NOT STANDARD FORTRAN ***/
#endif
		if (ptr == NULL)
		{	DO((*doend)((char)p->p1))
			return(OK);
		}
		if (!more) return(OK);
		pc++;
		break;
#ifndef KOSHER
	  case SU:				/*** NOT STANDARD FORTRAN ***/
#endif
	  case SS:
	  case SP:
	  case S: cplus = p->p1;
		signit = p->p2;
		pc++;
		break;
	  case P:
		scale = p->p1;
		pc++;
		break;
#ifndef KOSHER
	  case R:					/*** NOT STANDARD FORTRAN ***/
		radix = p->p1;
		pc++;
		break;
	  case B:					/*** NOT STANDARD FORTRAN ***/
		if (external) cblank = curunit->ublnk;
		else cblank = 0;		/* blank = 'NULL' */
		pc++;
		break;
#endif
	  case BNZ:
		cblank = p->p1;
		pc++;
		break;
	  default:
		err_f(errflag,F_ERFMT,"impossible code")
	  }
	}
}

fmt_bg()
{
	in_mid = NO;
	cp=rp=pc=cursor=0;
	cnt[0]=ret[0]=0;
	used_data = NO;
}

LOCAL
dof_err(n)
{
	if( reading==YES && external==YES && sequential==YES) donewrec();
	return(errno=n);
}