Change the order of length and offset code in startrw() -- always emit

[unix-history] / usr / src / usr.bin / f77 / pass1.vax / io.c

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
static	char *sccsid = "@(#)io.c	5.3 (Berkeley) %G%";
#endif

/*
 * io.c
 *
 * Routines to generate code for I/O statements.
 * Some corrections and improvements due to David Wasley, U. C. Berkeley
 *
 * University of Utah CS Dept modification history:
 *
 * $Header: io.c,v 5.3 86/03/04 17:45:33 donn Exp $
 * $Log:	io.c,v $
 * Revision 5.3  86/03/04  17:45:33  donn
 * Change the order of length and offset code in startrw() -- always emit
 * the memoffset first, since it may define a temporary which is used in
 * the length expression.
 * 
 * Revision 5.2  85/12/19  17:22:35  donn
 * Don't permit more than one 'positional iocontrol' parameter unless we
 * are doing a READ or a WRITE.
 * 
 * Revision 5.1  85/08/10  03:47:42  donn
 * 4.3 alpha
 * 
 * Revision 2.4  85/02/23  21:09:02  donn
 * Jerry Berkman's compiled format fixes move setfmt into a separate file.
 * 
 * Revision 2.3  85/01/10  22:33:41  donn
 * Added some strategic cpexpr()s to prevent memory management bugs.
 * 
 * Revision 2.2  84/08/04  21:15:47  donn
 * Removed code that creates extra statement labels, per Jerry Berkman's
 * fixes to make ASSIGNs work right.
 * 
 * Revision 2.1  84/07/19  12:03:33  donn
 * Changed comment headers for UofU.
 * 
 * Revision 1.2  84/02/26  06:35:57  donn
 * Added Berkeley changes necessary for shortening offsets to data.
 * 
 */

/* TEMPORARY */
#define TYIOINT TYLONG
#define SZIOINT SZLONG

#include "defs.h"
#include "io.h"


LOCAL char ioroutine[XL+1];

LOCAL int ioendlab;
LOCAL int ioerrlab;
LOCAL int endbit;
LOCAL int errbit;
LOCAL int jumplab;
LOCAL int skiplab;
LOCAL int ioformatted;
LOCAL int statstruct = NO;
LOCAL ftnint blklen;

LOCAL offsetlist *mkiodata();


#define UNFORMATTED 0
#define FORMATTED 1
#define LISTDIRECTED 2
#define NAMEDIRECTED 3

#define V(z)	ioc[z].iocval

#define IOALL 07777

LOCAL struct Ioclist
	{
	char *iocname;
	int iotype;
	expptr iocval;
	} ioc[ ] =
	{
		{ "", 0 },
		{ "unit", IOALL },
		{ "fmt", M(IOREAD) | M(IOWRITE) },
		{ "err", IOALL },
		{ "end", M(IOREAD) },
		{ "iostat", IOALL },
		{ "rec", M(IOREAD) | M(IOWRITE) },
		{ "recl", M(IOOPEN) | M(IOINQUIRE) },
		{ "file", M(IOOPEN) | M(IOINQUIRE) },
		{ "status", M(IOOPEN) | M(IOCLOSE) },
		{ "access", M(IOOPEN) | M(IOINQUIRE) },
		{ "form", M(IOOPEN) | M(IOINQUIRE) },
		{ "blank", M(IOOPEN) | M(IOINQUIRE) },
		{ "exist", M(IOINQUIRE) },
		{ "opened", M(IOINQUIRE) },
		{ "number", M(IOINQUIRE) },
		{ "named", M(IOINQUIRE) },
		{ "name", M(IOINQUIRE) },
		{ "sequential", M(IOINQUIRE) },
		{ "direct", M(IOINQUIRE) },
		{ "formatted", M(IOINQUIRE) },
		{ "unformatted", M(IOINQUIRE) },
		{ "nextrec", M(IOINQUIRE) }
	} ;

#define NIOS (sizeof(ioc)/sizeof(struct Ioclist) - 1)
#define MAXIO	SZFLAG + 10*SZIOINT + 15*SZADDR

#define IOSUNIT 1
#define IOSFMT 2
#define IOSERR 3
#define IOSEND 4
#define IOSIOSTAT 5
#define IOSREC 6
#define IOSRECL 7
#define IOSFILE 8
#define IOSSTATUS 9
#define IOSACCESS 10
#define IOSFORM 11
#define IOSBLANK 12
#define IOSEXISTS 13
#define IOSOPENED 14
#define IOSNUMBER 15
#define IOSNAMED 16
#define IOSNAME 17
#define IOSSEQUENTIAL 18
#define IOSDIRECT 19
#define IOSFORMATTED 20
#define IOSUNFORMATTED 21
#define IOSNEXTREC 22

#define IOSTP V(IOSIOSTAT)


/* offsets in generated structures */

#define SZFLAG SZIOINT

/* offsets for external READ and WRITE statements */

#define XERR 0
#define XUNIT	SZFLAG
#define XEND	SZFLAG + SZIOINT
#define XFMT	2*SZFLAG + SZIOINT
#define XREC	2*SZFLAG + SZIOINT + SZADDR
#define XRLEN	2*SZFLAG + 2*SZADDR
#define XRNUM	2*SZFLAG + 2*SZADDR + SZIOINT

/* offsets for internal READ and WRITE statements */

#define XIERR	0
#define XIUNIT	SZFLAG
#define XIEND	SZFLAG + SZADDR
#define XIFMT	2*SZFLAG + SZADDR
#define XIRLEN	2*SZFLAG + 2*SZADDR
#define XIRNUM	2*SZFLAG + 2*SZADDR + SZIOINT
#define XIREC	2*SZFLAG + 2*SZADDR + 2*SZIOINT

/* offsets for OPEN statements */

#define XFNAME	SZFLAG + SZIOINT
#define XFNAMELEN	SZFLAG + SZIOINT + SZADDR
#define XSTATUS	SZFLAG + 2*SZIOINT + SZADDR
#define XACCESS	SZFLAG + 2*SZIOINT + 2*SZADDR
#define XFORMATTED	SZFLAG + 2*SZIOINT + 3*SZADDR
#define XRECLEN	SZFLAG + 2*SZIOINT + 4*SZADDR
#define XBLANK	SZFLAG + 3*SZIOINT + 4*SZADDR

/* offset for CLOSE statement */

#define XCLSTATUS	SZFLAG + SZIOINT

/* offsets for INQUIRE statement */

#define XFILE	SZFLAG + SZIOINT
#define XFILELEN	SZFLAG + SZIOINT + SZADDR
#define XEXISTS	SZFLAG + 2*SZIOINT + SZADDR
#define XOPEN	SZFLAG + 2*SZIOINT + 2*SZADDR
#define XNUMBER	SZFLAG + 2*SZIOINT + 3*SZADDR
#define XNAMED	SZFLAG + 2*SZIOINT + 4*SZADDR
#define XNAME	SZFLAG + 2*SZIOINT + 5*SZADDR
#define XNAMELEN	SZFLAG + 2*SZIOINT + 6*SZADDR
#define XQACCESS	SZFLAG + 3*SZIOINT + 6*SZADDR
#define XQACCLEN	SZFLAG + 3*SZIOINT + 7*SZADDR
#define XSEQ	SZFLAG + 4*SZIOINT + 7*SZADDR
#define XSEQLEN	SZFLAG + 4*SZIOINT + 8*SZADDR
#define XDIRECT	SZFLAG + 5*SZIOINT + 8*SZADDR
#define XDIRLEN	SZFLAG + 5*SZIOINT + 9*SZADDR
#define XFORM	SZFLAG + 6*SZIOINT + 9*SZADDR
#define XFORMLEN	SZFLAG + 6*SZIOINT + 10*SZADDR
#define XFMTED	SZFLAG + 7*SZIOINT + 10*SZADDR
#define XFMTEDLEN	SZFLAG + 7*SZIOINT + 11*SZADDR
#define XUNFMT	SZFLAG + 8*SZIOINT + 11*SZADDR
#define XUNFMTLEN	SZFLAG + 8*SZIOINT + 12*SZADDR
#define XQRECL	SZFLAG + 9*SZIOINT + 12*SZADDR
#define XNEXTREC	SZFLAG + 9*SZIOINT + 13*SZADDR
#define XQBLANK	SZFLAG + 9*SZIOINT + 14*SZADDR
#define XQBLANKLEN	SZFLAG + 9*SZIOINT + 15*SZADDR
\f
fmtstmt(lp)
register struct Labelblock *lp;
{
if(lp == NULL)
	{
	execerr("unlabeled format statement" , CNULL);
	return(-1);
	}
if(lp->labtype == LABUNKNOWN)
	lp->labtype = LABFORMAT;
else if(lp->labtype != LABFORMAT)
	{
	execerr("bad format number", CNULL);
	return(-1);
	}
return(lp->labelno);
}



startioctl()
{
register int i;

inioctl = YES;
nioctl = 0;
ioformatted = UNFORMATTED;
for(i = 1 ; i<=NIOS ; ++i)
	V(i) = NULL;
}



endioctl()
{
int i;
expptr p;

inioctl = NO;

/* set up for error recovery */

ioerrlab = ioendlab = skiplab = jumplab = 0;

if(p = V(IOSEND))
	if(ISICON(p))
		ioendlab = execlab(p->constblock.const.ci) ->labelno;
	else
		err("bad end= clause");

if(p = V(IOSERR))
	if(ISICON(p))
		ioerrlab = execlab(p->constblock.const.ci) ->labelno;
	else
		err("bad err= clause");

if(IOSTP)
	if(IOSTP->tag!=TADDR || ! ISINT(IOSTP->addrblock.vtype) )
		{
		err("iostat must be an integer variable");
		frexpr(IOSTP);
		IOSTP = NULL;
		}

if(iostmt == IOREAD)
	{
	if(IOSTP)
		{
		if(ioerrlab && ioendlab && ioerrlab==ioendlab)
			jumplab = ioerrlab;
		else
			skiplab = jumplab = newlabel();
		}
	else	{
		if(ioerrlab && ioendlab && ioerrlab!=ioendlab)
			{
			IOSTP = (expptr) mktemp(TYINT, PNULL);
			skiplab = jumplab = newlabel();
			}
		else
			jumplab = (ioerrlab ? ioerrlab : ioendlab);
		}
	}
else if(iostmt == IOWRITE)
	{
	if(IOSTP && !ioerrlab)
		skiplab = jumplab = newlabel();
	else
		jumplab = ioerrlab;
	}
else
	jumplab = ioerrlab;

endbit = IOSTP!=NULL || ioendlab!=0;	/* for use in startrw() */
errbit = IOSTP!=NULL || ioerrlab!=0;
if(iostmt!=IOREAD && iostmt!=IOWRITE)
	{
	if(ioblkp == NULL)
		ioblkp = autovar( (MAXIO+SZIOINT-1)/SZIOINT , TYIOINT, PNULL);
	ioset(TYIOINT, XERR, ICON(errbit));
	}

switch(iostmt)
	{
	case IOOPEN:
		dofopen();  break;

	case IOCLOSE:
		dofclose();  break;

	case IOINQUIRE:
		dofinquire();  break;

	case IOBACKSPACE:
		dofmove("f_back"); break;

	case IOREWIND:
		dofmove("f_rew");  break;

	case IOENDFILE:
		dofmove("f_end");  break;

	case IOREAD:
	case IOWRITE:
		startrw();  break;

	default:
		fatali("impossible iostmt %d", iostmt);
	}
for(i = 1 ; i<=NIOS ; ++i)
	if(i!=IOSIOSTAT && V(i)!=NULL)
		frexpr(V(i));
}



iocname()
{
register int i;
int found, mask;

found = 0;
mask = M(iostmt);
for(i = 1 ; i <= NIOS ; ++i)
	if(toklen==strlen(ioc[i].iocname) && eqn(toklen, token, ioc[i].iocname))
		if(ioc[i].iotype & mask)
			return(i);
		else	found = i;
if(found)
	errstr("invalid control %s for statement", ioc[found].iocname);
else
	errstr("unknown iocontrol %s", varstr(toklen, token) );
return(IOSBAD);
}


ioclause(n, p)
register int n;
register expptr p;
{
struct Ioclist *iocp;

++nioctl;
if(n == IOSBAD)
	return;
if(n == IOSPOSITIONAL)
	{
	if(nioctl > IOSFMT ||
	   nioctl > IOSUNIT && !(iostmt == IOREAD || iostmt == IOWRITE))
		{
		err("illegal positional iocontrol");
		return;
		}
	n = nioctl;
	}

if(p == NULL)
	{
	if(n == IOSUNIT)
		p = (expptr) (iostmt==IOREAD ? IOSTDIN : IOSTDOUT);
	else if(n != IOSFMT)
		{
		err("illegal * iocontrol");
		return;
		}
	}
if(n == IOSFMT)
	ioformatted = (p==NULL ? LISTDIRECTED : FORMATTED);

iocp = & ioc[n];
if(iocp->iocval == NULL)
	{
	p = (expptr) cpexpr(p);
	if(n!=IOSFMT && ( n!=IOSUNIT || (p!=NULL && p->headblock.vtype!=TYCHAR) ) )
		p = fixtype(p);
	if(p!=NULL && ISCONST(p) && p->constblock.vtype==TYCHAR)
		p = (expptr) putconst(p);
	iocp->iocval = p;
}
else
	errstr("iocontrol %s repeated", iocp->iocname);
}

/* io list item */

doio(list)
chainp list;
{
expptr call0();

if(ioformatted == NAMEDIRECTED)
	{
	if(list)
		err("no I/O list allowed in NAMELIST read/write");
	}
else
	{
	doiolist(list);
	ioroutine[0] = 'e';
	putiocall( call0(TYINT, ioroutine) );
	}
}





LOCAL doiolist(p0)
chainp p0;
{
chainp p;
register tagptr q;
register expptr qe;
register Namep qn;
Addrp tp, mkscalar();
int range;
expptr expr;

for (p = p0 ; p ; p = p->nextp)
	{
	q = p->datap;
	if(q->tag == TIMPLDO)
		{
		exdo(range=newlabel(), q->impldoblock.impdospec);
		doiolist(q->impldoblock.datalist);
		enddo(range);
		free( (charptr) q);
		}
	else	{
		if(q->tag==TPRIM && q->primblock.argsp==NULL
		    && q->primblock.namep->vdim!=NULL)
			{
			vardcl(qn = q->primblock.namep);
			if(qn->vdim->nelt)
				putio( fixtype(cpexpr(qn->vdim->nelt)),
					mkscalar(qn) );
			else
				err("attempt to i/o array of unknown size");
			}
		else if(q->tag==TPRIM && q->primblock.argsp==NULL &&
		    (qe = (expptr) memversion(q->primblock.namep)) )
			putio(ICON(1),qe);
		else if( (qe = fixtype(cpexpr(q)))->tag==TADDR)
			putio(ICON(1), qe);
		else if(qe->headblock.vtype != TYERROR)
			{
			if(iostmt == IOWRITE)
				{
				ftnint lencat();
				expptr qvl;
				qvl = NULL;
				if( ISCHAR(qe) )
					{
					qvl = (expptr)
						cpexpr(qe->headblock.vleng);
					tp = mktemp(qe->headblock.vtype,
						     ICON(lencat(qe)));
					}
				else
					tp = mktemp(qe->headblock.vtype,
						qe->headblock.vleng);
				if (optimflag)
					{
					expr = mkexpr(OPASSIGN,cpexpr(tp),qe);
					optbuff (SKEQ,expr,0,0);
					}
				else
					puteq (cpexpr(tp),qe);
				if(qvl)	/* put right length on block */
					{
					frexpr(tp->vleng);
					tp->vleng = qvl;
					}
				putio(ICON(1), tp);
				}
			else
				err("non-left side in READ list");
			}
		frexpr(q);
		}
	}
frchain( &p0 );
}





LOCAL putio(nelt, addr)
expptr nelt;
register expptr addr;
{
int type;
register expptr q;

type = addr->headblock.vtype;
if(ioformatted!=LISTDIRECTED && ISCOMPLEX(type) )
	{
	nelt = mkexpr(OPSTAR, ICON(2), nelt);
	type -= (TYCOMPLEX-TYREAL);
	}

/* pass a length with every item.  for noncharacter data, fake one */
if(type != TYCHAR)
	{
	addr->headblock.vtype = TYCHAR;
	addr->headblock.vleng = ICON( typesize[type] );
	}

nelt = fixtype( mkconv(TYLENG,nelt) );
if(ioformatted == LISTDIRECTED)
	q = call3(TYINT, "do_lio", mkconv(TYLONG, ICON(type)), nelt, addr);
else
	q = call2(TYINT, (ioformatted==FORMATTED ? "do_fio" : "do_uio"),
		nelt, addr);
putiocall(q);
}




endio()
{
if(skiplab)
	{
	if (optimflag)
		optbuff (SKLABEL, 0, skiplab, 0);
	else
		putlabel (skiplab);
	if(ioendlab)
		{
		expptr test;
		test = mkexpr(OPGE, cpexpr(IOSTP), ICON(0));
		if (optimflag)
			optbuff (SKIOIFN,test,ioendlab,0);
		else
			putif (test,ioendlab);
		}
	if(ioerrlab)
		{
		expptr test;
		test = mkexpr
			( ((iostmt==IOREAD||iostmt==IOWRITE) ? OPLE : OPEQ),
			cpexpr(IOSTP), ICON(0));
		if (optimflag)
			optbuff (SKIOIFN,test,ioerrlab,0);
		else
			putif (test,ioerrlab);
		}
	}
if(IOSTP)
	frexpr(IOSTP);
}



LOCAL putiocall(q)
register expptr q;
{
if(IOSTP)
	{
	q->headblock.vtype = TYINT;
	q = fixexpr( mkexpr(OPASSIGN, cpexpr(IOSTP), q));
	}

if(jumplab)
	if (optimflag)
		optbuff (SKIOIFN,mkexpr(OPEQ,q,ICON(0)),jumplab,0);
	else
		putif (mkexpr(OPEQ,q,ICON(0)),jumplab);
else
	if (optimflag)
		optbuff (SKEQ, q, 0, 0);
	else
		putexpr(q);
}
\f
startrw()
{
register expptr p;
register Namep np;
register Addrp unitp, fmtp, recp, tioblkp;
register expptr nump;
register ioblock *t;
Addrp mkscalar();
expptr mkaddcon();
int k;
flag intfile, sequential, ok, varfmt;

/* First look at all the parameters and determine what is to be done */

ok = YES;
statstruct = YES;

intfile = NO;
if(p = V(IOSUNIT))
	{
	if( ISINT(p->headblock.vtype) )
		unitp = (Addrp) cpexpr(p);
	else if(p->headblock.vtype == TYCHAR)
		{
		intfile = YES;
		if(p->tag==TPRIM && p->primblock.argsp==NULL &&
		    (np = p->primblock.namep)->vdim!=NULL)
			{
			vardcl(np);
			if(np->vdim->nelt)
				{
				nump = (expptr) cpexpr(np->vdim->nelt);
				if( ! ISCONST(nump) )
					statstruct = NO;
				}
			else
				{
				err("attempt to use internal unit array of unknown size");
				ok = NO;
				nump = ICON(1);
				}
			unitp = mkscalar(np);
			}
		else	{
			nump = ICON(1);
			unitp = (Addrp) fixtype(cpexpr(p));
			}
		if(! isstatic(unitp) )
			statstruct = NO;
		}
	else
		{
		err("bad unit specifier type");
		ok = NO;
		}
	}
else
	{
	err("bad unit specifier");
	ok = NO;
	}

sequential = YES;
if(p = V(IOSREC))
	if( ISINT(p->headblock.vtype) )
		{
		recp = (Addrp) cpexpr(p);
		sequential = NO;
		}
	else	{
		err("bad REC= clause");
		ok = NO;
		}
else
	recp = NULL;


varfmt = YES;
fmtp = NULL;
if(p = V(IOSFMT))
	{
	if(p->tag==TPRIM && p->primblock.argsp==NULL)
		{
		np = p->primblock.namep;
		if(np->vclass == CLNAMELIST)
			{
			ioformatted = NAMEDIRECTED;
			fmtp = (Addrp) fixtype(cpexpr(p));
			goto endfmt;
			}
		vardcl(np);
		if(np->vdim)
			{
			if( ! ONEOF(np->vstg, MSKSTATIC) )
				statstruct = NO;
			fmtp = mkscalar(np);
			goto endfmt;
			}
		if( ISINT(np->vtype) )	/* ASSIGNed label */
			{
			statstruct = NO;
			varfmt = NO;
			fmtp = (Addrp) fixtype(cpexpr(p));
			goto endfmt;
			}
		}
	p = V(IOSFMT) = fixtype(p);
	if(p->headblock.vtype == TYCHAR)
		{
		if (p->tag == TCONST) p = (expptr) putconst(p);
		if( ! isstatic(p) )
			statstruct = NO;
		fmtp = (Addrp) cpexpr(p);
		}
	else if( ISICON(p) )
		{
		if( (k = fmtstmt( mklabel(p->constblock.const.ci) )) > 0 )
			{
			fmtp = (Addrp) mkaddcon(k);
			varfmt = NO;
			}
		else
			ioformatted = UNFORMATTED;
		}
	else	{
		err("bad format descriptor");
		ioformatted = UNFORMATTED;
		ok = NO;
		}
	}
else
	fmtp = NULL;

endfmt:
	if(intfile && ioformatted==UNFORMATTED)
		{
		err("unformatted internal I/O not allowed");
		ok = NO;
		}
	if(!sequential && ioformatted==LISTDIRECTED)
		{
		err("direct list-directed I/O not allowed");
		ok = NO;
		}
	if(!sequential && ioformatted==NAMEDIRECTED)
		{
		err("direct namelist I/O not allowed");
		ok = NO;
		}

if( ! ok )
	return;

if (optimflag && ISCONST (fmtp))
	fmtp = putconst ( (expptr) fmtp);

/*
   Now put out the I/O structure, statically if all the clauses
   are constants, dynamically otherwise
*/

if(statstruct)
	{
	tioblkp = ioblkp;
	ioblkp = ALLOC(Addrblock);
	ioblkp->tag = TADDR;
	ioblkp->vtype = TYIOINT;
	ioblkp->vclass = CLVAR;
	ioblkp->vstg = STGINIT;
	ioblkp->memno = ++lastvarno;
	ioblkp->memoffset = ICON(0);
	blklen = (intfile ? XIREC+SZIOINT :
			(sequential ? XFMT+SZADDR : XRNUM+SZIOINT) );
	t = ALLOC(IoBlock);
	t->blkno = ioblkp->memno;
	t->len = blklen;
	t->next = iodata;
	iodata = t;
	}
else if(ioblkp == NULL)
	ioblkp = autovar( (MAXIO+SZIOINT-1)/SZIOINT , TYIOINT, PNULL);

ioset(TYIOINT, XERR, ICON(errbit));
if(iostmt == IOREAD)
	ioset(TYIOINT, (intfile ? XIEND : XEND), ICON(endbit) );

if(intfile)
	{
	ioset(TYIOINT, XIRNUM, nump);
	ioseta(XIUNIT, cpexpr(unitp));
	ioset(TYIOINT, XIRLEN, cpexpr(unitp->vleng) );
	frexpr(unitp);
	}
else
	ioset(TYIOINT, XUNIT, (expptr) unitp);

if(recp)
	ioset(TYIOINT, (intfile ? XIREC : XREC) , (expptr) recp);

if(varfmt)
	ioseta( intfile ? XIFMT : XFMT , fmtp);
else
	ioset(TYADDR, intfile ? XIFMT : XFMT, (expptr) fmtp);

ioroutine[0] = 's';
ioroutine[1] = '_';
ioroutine[2] = (iostmt==IOREAD ? 'r' : 'w');
ioroutine[3] = (sequential ? 's' : 'd');
ioroutine[4] = "ufln" [ioformatted];
ioroutine[5] = (intfile ? 'i' : 'e');
ioroutine[6] = '\0';

putiocall( call1(TYINT, ioroutine, cpexpr(ioblkp) ));

if(statstruct)
	{
	frexpr(ioblkp);
	ioblkp = tioblkp;
	statstruct = NO;
	}
}



LOCAL dofopen()
{
register expptr p;

if( (p = V(IOSUNIT)) && ISINT(p->headblock.vtype) )
	ioset(TYIOINT, XUNIT, cpexpr(p) );
else
	err("bad unit in open");
if( (p = V(IOSFILE)) )
	if(p->headblock.vtype == TYCHAR)
		ioset(TYIOINT, XFNAMELEN, cpexpr(p->headblock.vleng) );
	else
		err("bad file in open");

iosetc(XFNAME, p);

if(p = V(IOSRECL))
	if( ISINT(p->headblock.vtype) )
		ioset(TYIOINT, XRECLEN, cpexpr(p) );
	else
		err("bad recl");
else
	ioset(TYIOINT, XRECLEN, ICON(0) );

iosetc(XSTATUS, V(IOSSTATUS));
iosetc(XACCESS, V(IOSACCESS));
iosetc(XFORMATTED, V(IOSFORM));
iosetc(XBLANK, V(IOSBLANK));

putiocall( call1(TYINT, "f_open", cpexpr(ioblkp) ));
}


LOCAL dofclose()
{
register expptr p;

if( (p = V(IOSUNIT)) && ISINT(p->headblock.vtype) )
	{
	ioset(TYIOINT, XUNIT, cpexpr(p) );
	iosetc(XCLSTATUS, V(IOSSTATUS));
	putiocall( call1(TYINT, "f_clos", cpexpr(ioblkp)) );
	}
else
	err("bad unit in close statement");
}


LOCAL dofinquire()
{
register expptr p;
if(p = V(IOSUNIT))
	{
	if( V(IOSFILE) )
		err("inquire by unit or by file, not both");
	ioset(TYIOINT, XUNIT, cpexpr(p) );
	}
else if( ! V(IOSFILE) )
	err("must inquire by unit or by file");
iosetlc(IOSFILE, XFILE, XFILELEN);
iosetip(IOSEXISTS, XEXISTS);
iosetip(IOSOPENED, XOPEN);
iosetip(IOSNUMBER, XNUMBER);
iosetip(IOSNAMED, XNAMED);
iosetlc(IOSNAME, XNAME, XNAMELEN);
iosetlc(IOSACCESS, XQACCESS, XQACCLEN);
iosetlc(IOSSEQUENTIAL, XSEQ, XSEQLEN);
iosetlc(IOSDIRECT, XDIRECT, XDIRLEN);
iosetlc(IOSFORM, XFORM, XFORMLEN);
iosetlc(IOSFORMATTED, XFMTED, XFMTEDLEN);
iosetlc(IOSUNFORMATTED, XUNFMT, XUNFMTLEN);
iosetip(IOSRECL, XQRECL);
iosetip(IOSNEXTREC, XNEXTREC);
iosetlc(IOSBLANK, XQBLANK, XQBLANKLEN);

putiocall( call1(TYINT,  "f_inqu", cpexpr(ioblkp) ));
}



LOCAL dofmove(subname)
char *subname;
{
register expptr p;

if( (p = V(IOSUNIT)) && ISINT(p->headblock.vtype) )
	{
	ioset(TYIOINT, XUNIT, cpexpr(p) );
	putiocall( call1(TYINT, subname, cpexpr(ioblkp) ));
	}
else
	err("bad unit in I/O motion statement");
}



LOCAL
ioset(type, offset, p)
int type;
int offset;
register expptr p;
{
  static char *badoffset = "badoffset in ioset";

  register Addrp q;
  register offsetlist *op;

  q = (Addrp) cpexpr(ioblkp);
  q->vtype = type;
  q->memoffset = fixtype( mkexpr(OPPLUS, q->memoffset, ICON(offset)) );

  if (statstruct && ISCONST(p))
    {
      if (!ISICON(q->memoffset))
	fatal(badoffset);

      op = mkiodata(q->memno, q->memoffset->constblock.const.ci, blklen);
      if (op->tag != 0)
	fatal(badoffset);

      if (type == TYADDR)
	{
	  op->tag = NDLABEL;
	  op->val.label = p->constblock.const.ci;
	}
      else
	{
	  op->tag = NDDATA;
	  op->val.cp = (Constp) convconst(type, 0, p);
	}

      frexpr((tagptr) p);
      frexpr((tagptr) q);
    }
  else
    if (optimflag)
      optbuff (SKEQ, mkexpr(OPASSIGN,q,p), 0,0);
    else
      puteq (q,p);

  return;
}




LOCAL iosetc(offset, p)
int offset;
register expptr p;
{
if(p == NULL)
	ioset(TYADDR, offset, ICON(0) );
else if(p->headblock.vtype == TYCHAR)
	ioset(TYADDR, offset, addrof(cpexpr(p) ));
else
	err("non-character control clause");
}



LOCAL ioseta(offset, p)
int offset;
register Addrp p;
{
  static char *badoffset = "bad offset in ioseta";

  int blkno;
  register offsetlist *op;

  if(statstruct)
    {
      blkno = ioblkp->memno;
      op = mkiodata(blkno, offset, blklen);
      if (op->tag != 0)
	fatal(badoffset);

      if (p == NULL)
	op->tag = NDNULL;
      else if (p->tag == TADDR)
	{
	  op->tag = NDADDR;
	  op->val.addr.stg = p->vstg;
	  op->val.addr.memno = p->memno;
	  op->val.addr.offset = p->memoffset->constblock.const.ci;
	}
      else
	badtag("ioseta", p->tag);
    }
  else
    ioset(TYADDR, offset, p ? addrof(p) : ICON(0) );

  return;
}




LOCAL iosetip(i, offset)
int i, offset;
{
register expptr p;

if(p = V(i))
	if(p->tag==TADDR &&
	    ONEOF(p->addrblock.vtype, M(TYLONG)|M(TYLOGICAL)) )
		ioset(TYADDR, offset, addrof(cpexpr(p)) );
	else
		errstr("impossible inquire parameter %s", ioc[i].iocname);
else
	ioset(TYADDR, offset, ICON(0) );
}



LOCAL iosetlc(i, offp, offl)
int i, offp, offl;
{
register expptr p;
if( (p = V(i)) && p->headblock.vtype==TYCHAR)
	ioset(TYIOINT, offl, cpexpr(p->headblock.vleng) );
iosetc(offp, p);
}


LOCAL offsetlist *
mkiodata(blkno, offset, len)
int blkno;
ftnint offset;
ftnint len;
{
  register offsetlist *p, *q;
  register ioblock *t;
  register int found;

  found = NO;
  t = iodata;

  while (found == NO && t != NULL)
    {
      if (t->blkno == blkno)
	found = YES;
      else
	t = t->next;
    }

  if (found == NO)
    {
      t = ALLOC(IoBlock);
      t->blkno = blkno;
      t->next = iodata;
      iodata = t;
    }

  if (len > t->len)
    t->len = len;

  p = t->olist;

  if (p == NULL)
    {
      p = ALLOC(OffsetList);
      p->next = NULL;
      p->offset = offset;
      t->olist = p;
      return (p);
    }

  for (;;)
    {
      if (p->offset == offset)
	return (p);
      else if (p->next != NULL &&
	       p->next->offset <= offset)
	p = p->next;
      else
	{
	  q = ALLOC(OffsetList);
	  q->next = p->next;
	  p->next = q;
	  q->offset = offset;
	  return (q);
	}
    }
}


outiodata()
{
  static char *varfmt = "v.%d:\n";

  register ioblock *p;
  register ioblock *t;

  if (iodata == NULL) return;

  p = iodata;

  while (p != NULL)
    {
      pralign(ALIDOUBLE);
      fprintf(initfile, varfmt, p->blkno);
      outolist(p->olist, p->len);

      t = p;
      p = t->next;
      free((char *) t);
    }

  iodata = NULL;
  return;
}



LOCAL
outolist(op, len)
register offsetlist *op;
register int len;
{
  static char *overlap = "overlapping i/o fields in outolist";
  static char *toolong = "offset too large in outolist";

  register offsetlist *t;
  register ftnint clen;
  register Constp cp;
  register int type;

  clen = 0;

  while (op != NULL)
    {
      if (clen > op->offset)
	fatal(overlap);

      if (clen < op->offset)
	{
	  prspace(op->offset - clen);
	  clen = op->offset;
	}

      switch (op->tag)
	{
	default:
	  badtag("outolist", op->tag);

	case NDDATA:
	  cp = op->val.cp;
	  type = cp->vtype;
	  if (type != TYIOINT)
	    badtype("outolist", type);
	  prconi(initfile, type, cp->const.ci);
	  clen += typesize[type];
	  frexpr((tagptr) cp);
	  break;

	case NDLABEL:
	  prcona(initfile, op->val.label);
	  clen += typesize[TYADDR];
	  break;

	case NDADDR:
	  praddr(initfile, op->val.addr.stg, op->val.addr.memno,
		 op->val.addr.offset);
	  clen += typesize[TYADDR];
	  break;

	case NDNULL:
	  praddr(initfile, STGNULL, 0, (ftnint) 0);
	  clen += typesize[TYADDR];
	  break;
	}

      t = op;
      op = t->next;
      free((char *) t);
    }

  if (clen > len)
    fatal(toolong);

  if (clen < len)
    prspace(len - clen);

  return;
}