ref: db46e826c23973ee2cdc93a2fcbe465fc022d0ff
dir: /sys/src/cmd/troff/t6.c/
/*
* 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;
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;
}
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 */
}
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)
{
int j;
char temp[50];
char *s;
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
*/
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();
}
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;
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;
}
setfp(int pos, int f, char *truename, int print) /* mount font f at position pos[0...nfonts] */
{
char pathname[NS], shortname[NS], *sl;
zapwcache(0);
if (truename)
strcpy(shortname, truename);
else
strcpy(shortname, (char *) unpair(f));
if (truename && strrchr(truename, '/')) { /* .fp 1 R dir/file: use verbatim */
sprintf(pathname, "%s", truename);
if (fonts[pos].truename)
free(fonts[pos].truename);
fonts[pos].truename = strdupl(truename);
} else if (truename) { /* synonym: .fp 1 R Avant */
sprintf(pathname, "%s/dev%s/%s", fontdir, devname, truename);
truename = 0; /* so doesn't get repeated by ptfpcmd */
} else /* vanilla: .fp 5 XX */
sprintf(pathname, "%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;
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;
}