/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved  	*/

/*	THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T	*/
/*	The copyright notice above does not evidence any   	*/
/*	actual or intended publication of such source code.	*/

#ident	"@(#)t6.c	1.5	92/07/14 SMI"	/* SVr4.0 1.1	*/

/*******************************************************************

		PROPRIETARY NOTICE (Combined)

This source code is unpublished proprietary information
constituting, or derived under license from AT&T's UNIX(r) System V.
In addition, portions of such source code were derived from Berkeley
4.3 BSD under license from the Regents of the University of
California.



		Copyright Notice 

Notice of copyright on this source code product does not indicate 
publication.

	(c) 1986,1987,1988,1989  Sun Microsystems, Inc
	(c) 1983,1984,1985,1986,1987,1988,1989  AT&T.
	          All rights reserved.
********************************************************************/ 

/*
 * t6.c
 * 
 * width functions, sizes and fonts
 */

#include "tdef.h"
#include "dev.h"
#include <ctype.h>
#include "ext.h"

/* fitab[f][c] is 0 if c is not on font f */
	/* if it's non-zero, c is in fontab[f] at position
	 * fitab[f][c].
	 */
extern	struct Font *fontbase[NFONT+1];
extern	char *codetab[NFONT+1];
extern int nchtab;

int	fontlab[NFONT+1];
short	*pstab;
int	cstab[NFONT+1];
int	ccstab[NFONT+1];
int	bdtab[NFONT+1];
int	sbold = 0;

width(j)
register tchar j;
{
	register i, k;

	if (j & (ZBIT|MOT)) {
		if (iszbit(j))
			return(0);
		if (isvmot(j))
			return(0);
		k = absmot(j);
		if (isnmot(j))
			k = -k;
		return(k);
	}
	i = cbits(j);
	if (i < ' ') {
		if (i == '\b')
			return(-widthp);
		if (i == PRESC)
			i = eschar;
		else if (iscontrol(i))
			return(0);
	}
	if (i==ohc)
		return(0);
	i = trtab[i];
	if (i < 32)
		return(0);
	if (sfbits(j) == oldbits) {
		xfont = pfont;
		xpts = ppts;
	} else 
		xbits(j, 0);
	if (widcache[i-32].fontpts == (xfont<<8) + xpts && !setwdf)
		k = widcache[i-32].width;
	else {
		k = getcw(i-32);
		if (bd)
			k += (bd - 1) * HOR;
		if (cs)
			k = cs;
	}
	widthp = k;
	return(k);
}

/*
 * clear width cache-- s means just space
 */
zapwcache(s)
{
	register i;

	if (s) {
		widcache[0].fontpts = 0;
		return;
	}
	for (i=0; i<NWIDCACHE; i++)
		widcache[i].fontpts = 0;
}

getcw(i)
register int	i;
{
	register int	k;
	register char	*p;
	register int	x, j;
	int nocache = 0;

	bd = 0;
	if (i >= nchtab + 128-32) {
		j = abscw(i + 32 - (nchtab+128));
		goto g0;
	}
	if (i == 0) {	/* a blank */
		k = (fontab[xfont][0] * spacesz + 6) / 12;
		/* this nonsense because .ss cmd uses 1/36 em as its units */
		/* and default is 12 */
		goto g1;
	}
	if ((j = fitab[xfont][i] & BYTEMASK) == 0) {	/* it's not on current font */
		/* search through search list of xfont
		 * to see what font it ought to be on.
		 * searches S, then remaining fonts in wraparound order.
		 */
		nocache = 1;
		if (smnt) {
			int ii, jj;
			for (ii=smnt, jj=0; jj < nfonts; jj++, ii=ii % nfonts + 1) {
				j = fitab[ii][i] & BYTEMASK;
				if (j != 0) {
					p = fontab[ii];
					k = *(p + j);
					if (xfont == sbold)
						bd = bdtab[ii];
					if (setwdf)
						numtab[CT].val |= kerntab[ii][j];
					goto g1;
				}
			}
		}
		k = fontab[xfont][0];	/* leave a space-size space */
		goto g1;
	}
 g0:
	p = fontab[xfont];
	if (setwdf)
		numtab[CT].val |= kerntab[xfont][j];
	k = *(p + j);
 g1:
	if (!bd)
		bd = bdtab[xfont];
	if (cs = cstab[xfont]) {
		nocache = 1;
		if (ccs = ccstab[xfont])
			x = ccs; 
		else 
			x = xpts;
		cs = (cs * EMPTS(x)) / 36;
	}
	k = ((k&BYTEMASK) * xpts + (Unitwidth / 2)) / Unitwidth;
	if (nocache|bd)
		widcache[i].fontpts = 0;
	else {
		widcache[i].fontpts = (xfont<<8) + xpts;
		widcache[i].width = k;
	}
	return(k);
	/* Unitwidth is Units/Point, where
	 * Units is the fundamental digitization
	 * of the character set widths, and
	 * Point is the number of goobies in a point
	 * e.g., for cat, Units=36, Point=6, so Unitwidth=36/6=6
	 * In effect, it's the size at which the widths
	 * translate directly into units.
	 */
}

abscw(n)	/* return index of abs char n in fontab[], etc. */
{	register int i, ncf;

	ncf = fontbase[xfont]->nwfont & BYTEMASK;
	for (i = 0; i < ncf; i++)
		if (codetab[xfont][i] == n)
			return i;
	return 0;
}

xbits(i, bitf)
register tchar i;
{
	register k;

	xfont = fbits(i);
	k = sbits(i);
	if (k) {
		xpts = pstab[--k];
		oldbits = sfbits(i);
		pfont = xfont;
		ppts = xpts;
		return;
	}
	switch (bitf) {
	case 0:
		xfont = font;
		xpts = pts;
		break;
	case 1:
		xfont = pfont;
		xpts = ppts;
		break;
	case 2:
		xfont = mfont;
		xpts = mpts;
	}
}


tchar setch()
{
	register j;
	char	temp[10];
	register char	*s;
	extern char	*chname;
	extern short	*chtab;
	extern int	nchtab;

	s = temp;
	if ((*s++ = getach()) == 0 || (*s++ = getach()) == 0)
		return(0);
	*s = '\0';
	for (j = 0; j < nchtab; j++)
		if (strcmp(&chname[chtab[j]], temp) == 0)
			return(j + 128 | chbits);
	return(0);
}

tchar setabs()		/* set absolute char from \C'...' */
{
	int i, n, nf;
	extern int	nchtab;

	getch();
	n = 0;
	n = inumb(&n);
	getch();
	if (nonumb)
		return 0;
	return n + nchtab + 128;
}



findft(i)
register int	i;
{
	register k;

	if ((k = i - '0') >= 0 && k <= nfonts && k < smnt)
		return(k);
	for (k = 0; fontlab[k] != i; k++)
		if (k > nfonts)
			return(-1);
	return(k);
}


caseps()
{
	register i;

	if (skip())
		i = apts1;
	else {
		noscale++;
		i = inumb(&apts);	/* this is a disaster for fractional point sizes */
		noscale = 0;
		if (nonumb)
			return;
	}
	casps1(i);
}


casps1(i)
register int	i;
{

/*
 * in olden times, it used to ignore changes to 0 or negative.
 * this is meant to allow the requested size to be anything,
 * in particular so eqn can generate lots of \s-3's and still
 * get back by matching \s+3's.

	if (i <= 0)
		return;
*/
	apts1 = apts;
	apts = i;
	pts1 = pts;
	pts = findps(i);
	mchbits();
}


findps(i)
register int	i;
{
	register j, k;

	for (j=k=0 ; pstab[j] != 0 ; j++)
		if (abs(pstab[j]-i) < abs(pstab[k]-i))
			k = j;

	return(pstab[k]);
}


mchbits()
{
	register i, j, k;

	i = pts;
	for (j = 0; i > (k = pstab[j]); j++)
		if (!k) {
			k = pstab[--j];
			break;
		}
	chbits = 0;
	setsbits(chbits, ++j);
	setfbits(chbits, font);
	sps = width(' ' | chbits);
	zapwcache(1);
}

setps()
{
	register int i, j;

	i = cbits(getch());
	if (isdigit(i)) {		/* \sd or \sdd */
		i -= '0';
		if (i == 0)		/* \s0 */
			j = apts1;
		else if (i <= 3 && isdigit(j = cbits(ch=getch()))) {	/* \sdd */
			j = 10 * i + j - '0';
			ch = 0;
		} else		/* \sd */
			j = i;
	} else if (i == '(') {		/* \s(dd */
		j = cbits(getch()) - '0';
		j = 10 * j + cbits(getch()) - '0';
		if (j == 0)		/* \s(00 */
			j = apts1;
	} else if (i == '+' || i == '-') {	/* \s+, \s- */
		j = cbits(getch());
		if (isdigit(j)) {		/* \s+d, \s-d */
			j -= '0';
		} else if (j == '(') {		/* \s+(dd, \s-(dd */
			j = cbits(getch()) - '0';
			j = 10 * j + cbits(getch()) - '0';
		}
		if (i == '-')
			j = -j;
		j += apts;
	}
	casps1(j);
}


tchar setht()		/* set character height from \H'...' */
{
	int n;
	tchar c;

	getch();
	n = inumb(&apts);
	getch();
	if (n == 0 || nonumb)
		n = apts;	/* does this work? */
	c = CHARHT;
	c |= ZBIT;
	setsbits(c, n);
	return(c);
}

tchar setslant()		/* set slant from \S'...' */
{
	int n;
	tchar c;

	getch();
	n = 0;
	n = inumb(&n);
	getch();
	if (nonumb)
		n = 0;
	c = SLANT;
	c |= ZBIT;
	setsfbits(c, n+180);
	return(c);
}


caseft()
{
	skip();
	setfont(1);
}


setfont(a)
int	a;
{
	register i, j;

	if (a)
		i = getrq();
	else 
		i = getsn();
	if (!i || i == 'P') {
		j = font1;
		goto s0;
	}
	if (i == 'S' || i == '0')
		return;
	if ((j = findft(i)) == -1)
		if ((j = setfp(0, i, 0)) == -1)	/* try to put it in position 0 */
			return;
s0:
	font1 = font;
	font = j;
	mchbits();
}


setwd()
{
	register base, wid;
	register tchar i;
	int	delim, emsz, k;
	int	savhp, savapts, savapts1, savfont, savfont1, savpts, savpts1;

	base = numtab[ST].val = numtab[ST].val = wid = numtab[CT].val = 0;
	if (ismot(i = getch()))
		return;
	delim = cbits(i);
	savhp = numtab[HP].val;
	numtab[HP].val = 0;
	savapts = apts;
	savapts1 = apts1;
	savfont = font;
	savfont1 = font1;
	savpts = pts;
	savpts1 = pts1;
	setwdf++;
	while (cbits(i = getch()) != delim && !nlflg) {
		k = width(i);
		wid += k;
		numtab[HP].val += k;
		if (!ismot(i)) {
			emsz = POINT * xpts;
		} else if (isvmot(i)) {
			k = absmot(i);
			if (isnmot(i))
				k = -k;
			base -= k;
			emsz = 0;
		} else 
			continue;
		if (base < numtab[SB].val)
			numtab[SB].val = base;
		if ((k = base + emsz) > numtab[ST].val)
			numtab[ST].val = k;
	}
	setn1(wid, 0, (tchar) 0);
	numtab[HP].val = savhp;
	apts = savapts;
	apts1 = savapts1;
	font = savfont;
	font1 = savfont1;
	pts = savpts;
	pts1 = savpts1;
	mchbits();
	setwdf = 0;
}


tchar vmot()
{
	dfact = lss;
	vflag++;
	return(mot());
}


tchar hmot()
{
	dfact = EM;
	return(mot());
}


tchar mot()
{
	register int j, n;
	register tchar i;

	j = HOR;
	getch(); /*eat delim*/
	if (n = atoi()) {
		if (vflag)
			j = VERT;
		i = makem(quant(n, j));
	} else
		i = 0;
	getch();
	vflag = 0;
	dfact = 1;
	return(i);
}


tchar sethl(k)
int	k;
{
	register j;
	tchar i;

	j = EM / 2;
	if (k == 'u')
		j = -j;
	else if (k == 'r')
		j = -2 * j;
	vflag++;
	i = makem(j);
	vflag = 0;
	return(i);
}


tchar makem(i)
register int	i;
{
	register tchar j;

	if ((j = i) < 0)
		j = -j;
	j |= MOT;
	if (i < 0)
		j |= NMOT;
	if (vflag)
		j |= VMOT;
	return(j);
}


tchar getlg(i)
tchar i;
{
	tchar j, k;
	register int lf;

	if ((lf = fontbase[fbits(i)]->ligfont) == 0) /* font lacks ligatures */
		return(i);
	j = getch0();
	if (cbits(j) == 'i' && (lf & LFI))
		j = LIG_FI;
	else if (cbits(j) == 'l' && (lf & LFL))
		j = LIG_FL;
	else if (cbits(j) == 'f' && (lf & LFF)) {
		if ((lf & (LFFI|LFFL)) && lg != 2) {
			k = getch0();
			if (cbits(k)=='i' && (lf&LFFI))
				j = LIG_FFI;
			else if (cbits(k)=='l' && (lf&LFFL))
				j = LIG_FFL;
			else {
				*pbp++ = k;
				j = LIG_FF;
			}
		} else 
			j = LIG_FF;
	} else {
		*pbp++ = j;
		j = i;
	}
	return(i & SFMASK | j);
}


caselg()
{

	lg = 1;
	if (skip())
		return;
	lg = atoi();
}


casefp()
{
	register int i, j;
	register char *s;

	skip();
	if ((i = cbits(getch()) - '0') <= 0 || i > nfonts)
		errprint(gettext("fp: bad font position %d"), i);
	else if (skip() || !(j = getrq()))
		errprint(gettext("fp: no font name"));
	else if (skip() || !getname())
		setfp(i, j, 0);
	else		/* 3rd argument = filename */
		setfp(i, j, nextf);
}

setfp(pos, f, truename)	/* mount font f at position pos[0...nfonts] */
int pos, f;
char *truename;
{
	register k;
	int n;
	char longname[NS], shortname[20];
	extern int nchtab;

	zapwcache(0);
	if (truename)
		strcpy(shortname, truename);
	else {
		shortname[0] = f & BYTEMASK;
		shortname[1] = f >> BYTE;
		shortname[2] = '\0';
	}
	sprintf(longname, "%s/dev%s/%s.out", fontfile, devname, shortname);
	if ((k = open(longname, 0)) < 0) {
		errprint(gettext("Can't open %s"), longname);
		return(-1);
	}
	n = fontbase[pos]->nwfont & BYTEMASK;
	read(k, (char *) fontbase[pos], 3*n + nchtab + 128 - 32 + sizeof(struct Font));
	kerntab[pos] = (char *) fontab[pos] + (fontbase[pos]->nwfont & BYTEMASK);
	/* have to reset the fitab pointer because the width may be different */
	fitab[pos] = (char *) fontab[pos] + 3 * (fontbase[pos]->nwfont & BYTEMASK);
	if ((fontbase[pos]->nwfont & BYTEMASK) > n) {
		errprint(gettext("Font %s too big for position %d"), shortname,
			pos);
		return(-1);
	}
	fontbase[pos]->nwfont = n;	/* so can load a larger one again later */
	close(k);
	if (pos == smnt) {
		smnt = 0; 
		sbold = 0; 
	}
	if ((fontlab[pos] = f) == 'S')
		smnt = pos;
	bdtab[pos] = cstab[pos] = ccstab[pos] = 0;
		/* if there is a directory, no place to store its name. */
		/* if position isn't zero, no place to store its value. */
		/* only time a FONTPOS is pushed back is if it's a */
		/* standard font on position 0 (i.e., mounted implicitly. */
		/* there's a bug here:  if there are several input lines */
		/* that look like .ft XX in short successtion, the output */
		/* will all be in the last one because the "x font ..." */
		/* comes out too soon.  pushing back FONTPOS doesn't work */
		/* with .ft commands because input is flushed after .xx cmds */
	ptfpcmd(pos, shortname);
	if (pos == 0)
		ch = (tchar) FONTPOS | (tchar) f << 16;
	return(pos);
}


casecs()
{
	register i, j;

	noscale++;
	skip();
	if (!(i = getrq()) || (i = findft(i)) < 0)
		goto rtn;
	skip();
	cstab[i] = atoi();
	skip();
	j = atoi();
	if (nonumb)
		ccstab[i] = 0;
	else
		ccstab[i] = findps(j);
rtn:
	zapwcache(0);
	noscale = 0;
}


casebd()
{
	register i, j, k;

	zapwcache(0);
	k = 0;
bd0:
	if (skip() || !(i = getrq()) || (j = findft(i)) == -1) {
		if (k)
			goto bd1;
		else 
			return;
	}
	if (j == smnt) {
		k = smnt;
		goto bd0;
	}
	if (k) {
		sbold = j;
		j = k;
	}
bd1:
	skip();
	noscale++;
	bdtab[j] = atoi();
	noscale = 0;
}


casevs()
{
	register i;

	skip();
	vflag++;
	dfact = INCH; /* default scaling is points! */
	dfactd = 72;
	res = VERT;
	i = inumb(&lss);
	if (nonumb)
		i = lss1;
	if (i < VERT) 
		i = VERT;
	lss1 = lss;
	lss = i;
}


casess()
{
	register i;

	noscale++;
	skip();
	if (i = atoi()) {
		spacesz = i & 0177;
		zapwcache(0);
		sps = width(' ' | chbits);
	}
	noscale = 0;
}


tchar xlss()
{
	/* stores \x'...' into
	 * two successive tchars.
	 * the first contains HX, the second the value,
	 * encoded as a vertical motion.
	 * decoding is done in n2.c by pchar().
	 */
	int	i;

	getch();
	dfact = lss;
	i = quant(atoi(), VERT);
	dfact = 1;
	getch();
	if (i >= 0)
		*pbp++ = MOT | VMOT | i;
	else
		*pbp++ = MOT | VMOT | NMOT | -i;
	return(HX);
}
