plan9port

t6.c (15492B)

---

 /*
  * t6.c
  *
  * width functions, sizes and fonts
  */
 
 #include "tdef.h"
 #include "fns.h"
 #include "ext.h"
 
 int	fontlab[MAXFONTS+1];
 int	cstab[MAXFONTS+1];
 int	ccstab[MAXFONTS+1];
 int	bdtab[MAXFONTS+1];
 int	sbold = 0;
 
 int
 t_width(Tchar j)
 {
 	int i, k;
 
 	if (iszbit(j))
 		return 0;
 	if (ismot(j)) {
 		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 (i == HX)
 			return(0);
 	}
 	if (i == ohc)
 		return(0);
 	i = trtab[i];
 	if (i < ' ')
 		return(0);
 	if (sfbits(j) == oldbits) {
 		xfont = pfont;
 		xpts = ppts;
 	} else
 		xbits(j, 0);
 	if (i < nchnames + ALPHABET && widcache[i].fontpts == (xfont<<8) + xpts && !setwdf)
 		k = widcache[i].width;
 	else {
 		k = getcw(i);
 		if (bd)
 			k += (bd - 1) * HOR;
 		if (cs)
 			k = cs;
 	}
 	widthp = k;
 	return(k);
 }
 
 /*
  * clear width cache-- s means just space
  */
 void zapwcache(int s)
 {
 	int i;
 
 	if (s) {
 		widcache[' '].fontpts = 0;
 		return;
 	}
 	for (i=0; i<NWIDCACHE; i++)
 		widcache[i].fontpts = 0;
 }
 
 int
 onfont(int n, int f)	/* is char n on font f? */
 {
 	int i;
 	Font *fp = &fonts[f];
 	Chwid *cp, *ep;
 	char *np;
 
 	if (n < ALPHABET) {
 		if (fp->wp[n].num == n)	/* ascii at front */
 			return n;
 		else
 			return -1;
 	}
 	cp = &fp->wp[ALPHABET];
 	ep = &fp->wp[fp->nchars];
 	for ( ; cp < ep; cp++)	/* search others */
 		if (cp->num == n)
 			return cp - &fp->wp[0];
 	/* maybe it was a \N... */
 	np = chname(n);
 	if (*np == Number) {
 		i = atoi(np+1);		/* sscanf(np+1, "%d", &i); */
 		cp = &fp->wp[0];
 		ep = &fp->wp[fp->nchars];
 		for ( ; cp < ep; cp++) {	/* search others */
 			if (cp->code == i)
 				return cp - &fp->wp[0];
 		}
 		return -2;	/* a \N that doesn't have an entry */
 	}
 	return -1;	/* vanilla not found */
 }
 
 int
 getcw(int i)
 {
 	int k, n, x;
 	Font *fp;
 	int nocache = 0;
 	if (i < ' ')
 		return 0;
 	bd = 0;
 	fp = &fonts[xfont];
 	if (i == ' ') {	/* a blank */
 		k = (fp->spacewidth * spacesz + 6) / 12;
 		/* this nonsense because .ss cmd uses 1/36 em as its units */
 		/* 	and default is 12 */
 	} else if ((n = onfont(i, xfont)) >= 0) {	/* on this font at n */
 		k = fp->wp[n].wid;
 		if (setwdf)
 			numtabp[CT].val |= fp->wp[n].kern;
 	} else if (n == -2) {		/* \N with default width */
 
 		k = fp->defaultwidth;
 	} else {			/* not on current font */
 		nocache = 1;
 		k = fp->defaultwidth;	/* default-size space */
 		if (smnt) {
 			int ii, jj;
 			for (ii=smnt, jj=0; jj < nfonts; jj++, ii=ii % nfonts + 1) {
 				if ((n = onfont(i, ii)) >= 0) {
 					k = fonts[ii].wp[n].wid;
 					if (xfont == sbold)
 						bd = bdtab[ii];
 					if (setwdf)
 						numtabp[CT].val |= fonts[ii].wp[n].kern;
 					break;
 				}
 			}
 		}
 	}
 	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;
 	}
 	/* was (k & BYTEMASK);  since .wid is unsigned, should never happen */
 	if (k < 0)
 		ERROR "can't happen: negative width %d in getcw %d\n", k, i WARN;
 	k = (k * 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.
 	*/
 }
 
 void xbits(Tchar i, int bitf)
 {
 	int k;
 
 	if(TROFF) {
 		xfont = fbits(i);
 		k = sbits(i);
 		if(k) {
 			xpts = pstab[k-1];
 			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;
 		}
 	}
 }
 
 
 /* these next two functions ought to be the same in troff and nroff, */
 /* but the data structures they search are different. */
 /* silly historical problem. */
 
 
 Tchar t_setch(int c)
 {
 #ifndef UNICODE
 	int j;
 #endif
 	char temp[50];
 	char *s;
 
 #ifndef UNICODE
 	j = 0;
 #endif
 	s = temp;
 	if (c == '(') {	/* \(xx */
 		if ((*s++ = getach()) == 0 || (*s++ = getach()) == 0)
 			return(0);
 	} else {	/* \C'...' */
 		c = getach();
 		while ((*s = getach()) != c && *s != 0 && s < temp + sizeof(temp) - 1)
 			s++;
 	}
 	*s = '\0';
 #ifdef UNICODE
 	return chadd(temp, Troffchar, Install) | chbits; /* add name even if haven't seen it */
 #else
 	if (NROFF) {
 		j = chadd(temp, Troffchar, Lookup);
 		if ( j == -1)
 			return 0;
 		else
 			return j | chbits;
 	} else
 		return chadd(temp, Troffchar, Install) | chbits; /* add name even if haven't seen it */
 
 #endif /*UNICODE*/
 }
 
 Tchar t_setabs(void)		/* set absolute char from \N'...' */
 {
 	int n;
 	char temp[10];
 
 	getch();	/* delim */
 	n = 0;
 	n = inumb(&n);
 	getch();	/* delim */
 	if (nonumb)
 		return 0;
 	sprintf(temp, "%d", n);	/* convert into "#n" */
 	n = chadd(temp, Number, Install);
 	return n | chbits;
 }
 
 
 /*
  * fontlab[] is a cache that contains font information
  * for each font.
  * fontlab[] contains the 1- or 2-character name of the
  * font current associated with that font.
  * fonts 1..nfonts correspond to the mounted fonts;
  * the last of these are the special fonts.
  * If we don't use the (named) font in one of the
  * standard positions, we install the name in the next
  * free slot of fontlab[] and font[].
  * Whenever we need info about the font, we
  * read in the data into the next free slot with getfont.
  * The ptfont() (t10.c) routine will tell
  * the device filter to put the font always at position
  * zero if xfont > nfonts, so no need to change these filters.
  * Yes, this is a bit kludgy.
  *
  * This gives the new specs of findft:
  * 	find the font name i, where i also can be a number.
  * 	Installs the font(name) i when not present
  * 	returns -1 on error
  */
 
 int
 t_findft(int i)
 {
 	int k;
 	Uchar *p;
 
 	p = unpair(i);
 
 	if (isdigit(p[0])) {		/* first look for numbers */
 		k = p[0] - '0';
 		if (p[1] > 0 && isdigit(p[1]))
 			k = 10 * k + p[1] - '0';
 		if (k > 0 && k <= nfonts && k < smnt)
 			return(k);	/* mounted font:  .ft 3 */
 		if (fontlab[k] && k <= MAXFONTS) {	/* translate */
 			return(k);			/*number to a name */
 		} else {
 			fprintf(stderr, "troff: no font at position %d\n", k);
 			return(-1);	/* wild number */
 		}
 	}
 
 	/*
 	 * Now we look for font names
 	 */
 	for (k = 1; fontlab[k] != i; k++) {
 		if (k > MAXFONTS)
 			return(-1);	/* running out of fontlab space */
 		if (fontlab[k] == 0) {	/* passed all existing names */
 			if (setfp(k, i, (char *) 0, 1) == -1)
 				return(-1);
 			else {
 				fontlab[k] = i;	/* install the name */
 				return(k);
 			}
 		}
 	}
 	return(k);			/* was one of the existing names */
 }
 
 
 void caseps(void)
 {
 	int i;
 
 	if (TROFF) {
 		if(skip())
 			i = apts1;
 		else {
 			noscale++;
 			i = inumb(&apts);	/* this is a disaster for fractional point sizes */
 			noscale = 0;
 			if(nonumb)
 				i = apts1;
 		}
 		casps1(i);
 	}
 }
 
 
 void casps1(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();
 }
 
 int
 findps(int i)
 {
 	int j, k;
 
 	for (j=k=0 ; pstab[j] != 0 ; j++)
 		if (abs(pstab[j]-i) < abs(pstab[k]-i))
 			k = j;
 
 	return(pstab[k]);
 }
 
 
 void t_mchbits(void)
 {
 	int i, j, k;
 
 	i = pts;
 	for (j = 0; i > (k = pstab[j]); j++)
 		if (!k) {
 			j--;
 			break;
 		}
 	chbits = 0;
 	setsbits(chbits, ++j);
 	setfbits(chbits, font);
 	sps = width(' ' | chbits);
 	zapwcache(1);
 }
 
 void t_setps(void)
 {
 	int i, j;
 
 	j = 0;
 	i = cbits(getch());
 	if (isdigit(i)) {		/* \sd or \sdd */
 		i -= '0';
 		if (i == 0)		/* \s0 */
 			j = apts1;
 		else if (i <= 3 && (ch=getch()) && isdigit(j = cbits(ch))) {	/* \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 t_setht(void)		/* 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);
 	setfbits(c, pts);	/* sneaky, CHARHT font bits are size bits */
 	return(c);
 }
 
 Tchar t_setslant(void)		/* 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);
 }
 
 
 void caseft(void)
 {
 	if (!TROFF) {
 		n_caseft();
 		return;
 	}
 	skip();
 	setfont(1);
 }
 
 
 void t_setfont(int a)
 {
 	int i, j;
 
 	if (a)
 		i = getrq();
 	else
 		i = getsn();
 	if (!i || i == 'P') {
 		j = font1;
 		goto s0;
 	}
 	if (/* i == 'S' || */ i == '0')	/* an experiment -- why can't we change to it? */
 		return;
 	if ((j = findft(i)) == -1)
 		if ((j = setfp(0, i, (char*) 0, 1)) == -1)	/* try to put it in position 0 */
 			return;
 s0:
 	font1 = font;
 	font = j;
 	mchbits();
 }
 
 
 void t_setwd(void)
 {
 	int base, wid;
 	Tchar i;
 	int delim, emsz, k;
 	int savhp, savapts, savapts1, savfont, savfont1, savpts, savpts1;
 
 	base = numtabp[ST].val = numtabp[SB].val = wid = numtabp[CT].val = 0;
 	if (ismot(i = getch()))
 		return;
 	delim = cbits(i);
 	savhp = numtabp[HP].val;
 	numtabp[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;
 		numtabp[HP].val += k;
 		if (!ismot(i)) {
 			emsz = (INCH/72) * xpts;
 		} else if (isvmot(i)) {
 			k = absmot(i);
 			if (isnmot(i))
 				k = -k;
 			base -= k;
 			emsz = 0;
 		} else
 			continue;
 		if (base < numtabp[SB].val)
 			numtabp[SB].val = base;
 		if ((k = base + emsz) > numtabp[ST].val)
 			numtabp[ST].val = k;
 	}
 	setn1(wid, 0, (Tchar) 0);
 	numtabp[HP].val = savhp;
 	apts = savapts;
 	apts1 = savapts1;
 	font = savfont;
 	font1 = savfont1;
 	pts = savpts;
 	pts1 = savpts1;
 	mchbits();
 	setwdf = 0;
 }
 
 
 Tchar t_vmot(void)
 {
 	dfact = lss;
 	vflag++;
 	return t_mot();
 }
 
 
 Tchar t_hmot(void)
 {
 	dfact = EM;
 	return t_mot();
 }
 
 
 Tchar t_mot(void)
 {
 	int j, n;
 	Tchar i;
 
 	j = HOR;
 	getch(); /*eat delim*/
 	if (n = atoi0()) {
 		if (vflag)
 			j = VERT;
 		i = makem(quant(n, j));
 	} else
 		i = 0;
 	getch();
 	vflag = 0;
 	dfact = 1;
 	return(i);
 }
 
 
 Tchar t_sethl(int k)
 {
 	int 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 t_makem(int i)
 {
 	Tchar j;
 
 	if (i >= 0)
 		j = i;
 	else
 		j = -i;
 	if (Hor > 1 && !vflag)
 		j = (j + Hor/2)/Hor * Hor;
 	j |= MOT;
 	if (i < 0)
 		j |= NMOT;
 	if (vflag)
 		j |= VMOT;
 	return(j);
 }
 
 
 Tchar getlg(Tchar i)
 {
 	Tchar j, k;
 	int lf;
 
 	if (!TROFF)
 		return i;
 	if ((lf = fonts[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);
 }
 
 
 void caselg(void)
 {
 
 	if(TROFF) {
 		skip();
 		lg = atoi0();
 		if (nonumb)
 			lg = 1;
 	}
 }
 
 void casefp(void)
 {
 	int i, j;
 
 	if (!TROFF) {
 		n_casefp();
 		return;
 	}
 	skip();
 	i = cbits(getch());
 	if (isdigit(i)) {
 		i -= '0';
 		j = cbits(getch());
 		if (isdigit(j))
 			i = 10 * i + j - '0';
 	}
 	if (i <= 0 || i > nfonts)
 		ERROR "fp: bad font position %d", i WARN;
 	else if (skip() || !(j = getrq()))
 		ERROR "fp: no font name" WARN;
 	else if (skip() || !getname())
 		setfp(i, j, (char*) 0, 1);
 	else		/* 3rd argument = filename */
 		setfp(i, j, nextf, 1);
 }
 
 char *strdupl(const char *s)	/* make a copy of s */
 {
 	char *t;
 
 	t = (char *) malloc(strlen(s) + 1);
 	if (t == NULL)
 		ERROR "out of space in strdupl(%s)", s FATAL;
 	strcpy(t, s);
 	return t;
 }
 
 int
 setfp(int pos, int f, char *truename, int print)	/* mount font f at position pos[0...nfonts] */
 {
 	char pathname[NS], shortname[NS];
 
 	zapwcache(0);
 	if (truename)
 		strcpy(shortname, truename);
 	else
 		strcpy(shortname, (char *) unpair(f));
 	if (truename && strrchr(truename, '/')) {	/* .fp 1 R dir/file: use verbatim */
 		snprintf(pathname, NS, "%s", truename);
 		if (fonts[pos].truename)
 			free(fonts[pos].truename);
 		fonts[pos].truename = strdupl(truename);
 	} else if (truename) {			/* synonym: .fp 1 R Avant */
 		snprintf(pathname, NS, "%s/dev%s/%s", fontdir, devname, truename);
 		truename = 0;	/* so doesn't get repeated by ptfpcmd */
 	} else					/* vanilla: .fp 5 XX */
 		snprintf(pathname, NS, "%s/dev%s/%s", fontdir, devname, shortname);
 	if (truename == 0 && fonts[pos].truename != 0) {
 		free(fonts[pos].truename);
 		fonts[pos].truename = 0;
 	}
 	if (getfont(pathname, pos) < 0) {
 		ERROR "Can't open font file %s", pathname WARN;
 		return -1;
 	}
 	if (print && !ascii) {
 		ptfpcmd(pos, fonts[pos].longname, truename);
 		ptfont();
 	}
 	if (pos == smnt) {
 		smnt = 0;
 		sbold = 0;
 	}
 	fontlab[pos] = f;
 	if (smnt == 0 && fonts[pos].specfont)
 		smnt = pos;
 	bdtab[pos] = cstab[pos] = ccstab[pos] = 0;
 	return pos;
 }
 
 /*
  * .cs request; don't check legality of optional arguments
  */
 void casecs(void)
 {
 	int i, j;
 
 	if (TROFF) {
 		int savtr = trace;
 
 		trace = 0;
 		noscale++;
 		skip();
 		if (!(i = getrq()) || (i = findft(i)) < 0)
 			goto rtn;
 		skip();
 		cstab[i] = atoi0();
 		skip();
 		j = atoi0();
 		if(nonumb)
 			ccstab[i] = 0;
 		else
 			ccstab[i] = findps(j);
 	rtn:
 		zapwcache(0);
 		noscale = 0;
 		trace = savtr;
 	}
 }
 
 
 void casebd(void)
 {
 	int i, j, k;
 
 	j=0;
 	if (!TROFF) {
 		n_casebd();
 		return;
 	}
 	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] = atoi0();
 	noscale = 0;
 }
 
 
 void casevs(void)
 {
 	int i;
 
 	if (!TROFF) {
 		n_casevs();
 		return;
 	}
 	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;
 }
 
 
 void casess(void)
 {
 	int i;
 
 	if(TROFF) {
 		noscale++;
 		skip();
 		if(i = atoi0()) {
 			spacesz = i & 0177;
 			zapwcache(0);
 			sps = width(' ' | chbits);
 		}
 		noscale = 0;
 	}
 }
 
 
 Tchar t_xlss(void)
 {
 	/* 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(atoi0(), VERT);
 	dfact = 1;
 	getch();
 	if (i >= 0)
 		*pbp++ = MOT | VMOT | i;
 	else
 		*pbp++ = MOT | VMOT | NMOT | -i;
 	return(HX);
 }
 
 Uchar *unpair(int i)
 {
 	static Uchar name[3];
 
 	name[0] = i & SHORTMASK;
 	name[1] = (i >> SHORT) & SHORTMASK;
 	name[2] = 0;
 	return name;
 }