t10.c

unix v7是最后一个广泛发布的研究型UNIX版本

#include "tdef.h"
extern
#include "d.h"
extern
#include "v.h"
/*
troff10.c

CAT interface
*/

extern int *olinep;
extern int oline[];
extern int *pslp;
extern int back;
extern int xpts;
extern int mpts;
extern int po;
extern int xflg;
extern int line[];
extern int lss;
extern int xbitf;
extern char obuf[];
extern char *obufp;
extern int esct;
extern int trflg;
extern int cs;
extern int smnt;
extern int mfont;
extern int xfont;
extern int code;
extern int mcase;
extern int esc;
extern int lead;
extern int paper;
extern int cps;
extern int psflg;
extern int ptid;
extern int verm;
extern int escm;
extern char pstab[], psctab[];
extern int dpn;
extern int ascii;
int mrail = 0; /*0=LR,1=UR*/
int mmag = 1; /*0=UM,1=LM*/
extern int nofeed;
extern int gflag;
extern int fontlab[];
int papflg;
extern int pfont;
extern int ppts;
extern int oldbits;
extern int bd;
extern int vflag;
extern int stopmesg;
extern int xxx;

ptinit(){

	if(ascii || gflag)return;
	oput(T_INIT);
	esc = T_IESC;
	ptesc();
	esct = 0;
	esc = po;
	oput(0140); /*some initial lead*/
}
ptout(i)
int i;
{
	register *k, lw, *j;
	int ds, de, inith, temp, *slp, dv;
	int psl[16];

	if((i & CMASK) != '\n'){
		*olinep++ = i;
		return;
	}
	if(olinep == oline){
		lead += lss;
		return;
	}
	pslp = psl;
	*pslp = lw = inith = dv = 0;
	for(k=oline; k<olinep; k++){
		trflg++;
		xbitf = 1;
		lw += width(*k);
		if((*k & (MOT | VMOT)) == (MOT | VMOT)){
			temp = *k & ~MOTV;
			if(*k & NMOT)temp = -temp;
			dv += temp;
		}
		if(!(*k & MOT) && xflg)for(j=psl; j<=pslp; j++){
			if(xpts == *j)break;
			if(j == pslp){
				*j = xpts;
				*++pslp = 0;
				break;
			}
		}
	}
	if(dv){
		vflag++;
		*olinep++ = makem(-dv);
		vflag = 0;
	}
	if(xflg){
	--pslp;
		for(j=psl; j<=pslp; j++){
			if(*j == mpts){
				temp = *j;
				*j = *pslp;
				*pslp = temp;
				break;
			}
		}
	}
	for(k=oline; k<olinep; k++){
		if(!(*k & MOT) || (*k & VMOT))break;
		*k &= ~MOT;
		if(*k & NMOT){
			*k &= ~NMOT;
			*k = -*k;
		}
		inith += *k;
	}
	lead += dip->blss + lss;
	dip->blss = 0;
	slp = k;
scan:
	temp = esct - po;
	if(mpts & DBL)temp -= 55;
	ds = temp - inith;
	de = lw - temp;
	if(de >= ds){
		back = 0;
		esc = -ds;
		for(k=slp; k<olinep; k++)ptout0(*k);
	}else{
		back = 1;
		esc = de;
		for(k = olinep-1; k>=slp; --k)ptout0(*k);
	}
	if(xflg && (--pslp >= psl))goto scan;
	olinep = oline;
	lead += dip->alss;
	dip->alss = 0;
}
ptout0(i)
int i;
{
	register j, k, w;
	int z;

	if(i & MOT){
		j = i & ~MOTV;
		if(i & NMOT)j = -j;
		if(back)j = -j;
		if(i & VMOT)lead += j;
		else esc += j;
		return;
	}
	xbitf = 2;
	if((i>>BYTE) == oldbits){
		xfont = pfont;
		xpts = ppts;
		xbitf = 0;
	}else xbits(i);
	if((k = (i & CMASK)) < 040){
		return;
	}
	w = getcw(k-32);
	if(cs){
		if(bd)w += bd - 1;
		j = (cs-w)/2;
		w = cs - j;
		if(bd)w -= bd - 1;
	}else j = 0;
	if(i & ZBIT){
		if(cs)w = -j; else w = 0;
		z = 1;
	}else z = 0;
	if(back){
		k = j;
		j = -w;
		w = -k;
	}
	esc += j;
	if((!xflg || (xpts == *pslp)) && (code & 077)){
		if(code & 0200){
			if(smnt)xfont = smnt -1;
			else goto p1;
		}
		if((k=(code>>6)&01)^mcase)oput((mcase=k)+0105);
		if(xfont != mfont){
			mfont = xfont;
			if(mrail != (xfont&01))
				oput(0101 + (mrail=xfont&01));
			if(mmag != (xfont<2))
				oput(0103 + (mmag=(xfont<2)));
		}
		if(xpts != mpts)ptps();
		if(lead)ptlead();
		if(esc)ptesc();
/*
		oput(code & 077);
*/
		*obufp++ = code & 077;
		if(obufp == (obuf + OBUFSZ + ascii - 1))flusho();
		if(bd){
			bd -= 1;
			if(back && !z)bd = -bd;
			if(esc += bd)ptesc();
			oput(code & 077);
			if(z)esc -= bd;
		}
	}else if(bd && !z){
		bd -= 1;
		if(back)bd = -bd;
		esc += bd;
	}
p1:
	esc += w;
	return;
}
ptps(){
	register i, j, k;

	if(psflg)return;
	if(cps){
		psflg++;
		i = findps(cps);
	}else i = xpts;
	for(j=0; (i&077) > (k = pstab[j]);j++)if(!k){k=pstab[--j];break;}
	j = psctab[j];
	oput((j & ~0200) | 0120);
	if((!(mpts & DBL))^(!(j & 0200))){
		if(j & 0200)k = 55;
			else k = -55;
		esc += k;
	}
	mpts = i;
}
ptlead(){
	register i, k;

	if(k = lead < 0)lead = -lead;
	if(k^verm)oput(0112 + ((verm=k)<<1));
	if(((k=lead)%3) == 2)k++;
	k /= 3;
	while(k > 0){
		if((i=31) > k)i = k;
		if(verm)paper -= i;
			else paper += i;
		oput(((~i) & 037) | 0140);
		if((paper > (11*144*15)) && !papflg && ptid != 1){
			prstr("Excessive paper use.\n");
			papflg++;
			if(ptid != 1){
				lead = 0;
				done2(0200);
			}
		}
		k -= i;
	}
	lead = 0;
}
ptesc(){
	register i, j, k;

	if(k = esc < 0)esc = -esc;
	if(k^escm)oput(0107 + (escm=k));
	k = esc;
	while(k > 0){
		if((i=127) > k)i = k;
		if(((j = (esct + i*(1-2*escm))) > (46*72+18-T_IESC)) ||
		   (j < 0))break;
/*
		oput(~i);
*/
		*obufp++ = ~i;
		if(obufp == (obuf + OBUFSZ + ascii - 1))flusho();
		esct = j;
		k -= i;
	}
	esc = 0;
}
dostop(){
	register i;

	if(ascii)return;
	if(!nofeed && !gflag)lead += TRAILER;
	ptlead();
	flusho();
	oput(T_INIT);
	oput(T_STOP);
	if(gflag){
		oput('f');
		for(i=0; i<4; i++){
			oput(fontlab[i] & BMASK);
			oput((fontlab[i]>>BYTE) & BMASK);
		}
	}else for(i=8; i>0; i--)oput(T_PAD);
	flusho();
	if(stopmesg)prstr("Pages finished.\n");
	mcase = mpts = mfont = mrail = verm = escm = 0;
	mmag = 1;
	report();
	paper = 0;
	esc = T_IESC;
	ptesc();
	esct = 0;
	esc = po;
}