ref: b0377e84cf31c48afed765c433abe7eebb4135a5
dir: /sys/src/cmd/troff/n9.c/
#include "tdef.h"
#include "ext.h"
#include "fns.h"
/*
* troff9.c
*
* misc functions
*/
Tchar setz(void)
{
Tchar i;
if (!ismot(i = getch()))
i |= ZBIT;
return(i);
}
void setline(void)
{
Tchar *i;
Tchar c;
int length;
int j, w, cnt, delim, rem, temp;
Tchar linebuf[NC];
if (ismot(c = getch()))
return;
delim = cbits(c);
vflag = 0;
dfact = EM;
length = quant(atoi0(), HOR);
dfact = 1;
if (!length) {
eat(delim);
return;
}
s0:
if ((j = cbits(c = getch())) == delim || j == '\n') {
ch = c;
c = RULE | chbits;
} else if (cbits(c) == FILLER)
goto s0;
w = width(c);
if (w <= 0) {
ERROR "zero-width underline character ignored" WARN;
c = RULE | chbits;
w = width(c);
}
i = linebuf;
if (length < 0) {
*i++ = makem(length);
length = -length;
}
if (!(cnt = length / w)) {
*i++ = makem(-(temp = ((w - length) / 2)));
*i++ = c;
*i++ = makem(-(w - length - temp));
goto s1;
}
if (rem = length % w) {
if (cbits(c) == RULE || cbits(c) == UNDERLINE || cbits(c) == ROOTEN)
*i++ = c | ZBIT;
*i++ = makem(rem);
}
if (cnt) {
*i++ = RPT;
*i++ = cnt;
*i++ = c;
}
s1:
*i = 0;
eat(delim);
pushback(linebuf);
}
eat(int c)
{
int i;
while ((i = cbits(getch())) != c && i != '\n')
;
return(i);
}
void setov(void)
{
int j, k;
Tchar i, o[NOV+1];
int delim, w[NOV+1];
if (ismot(i = getch()))
return;
delim = cbits(i);
for (k = 0; k < NOV && (j = cbits(i = getch())) != delim && j != '\n'; k++) {
o[k] = i;
w[k] = width(i);
}
o[k] = w[k] = 0;
if (o[0])
for (j = 1; j; ) {
j = 0;
for (k = 1; o[k] ; k++) {
if (w[k-1] < w[k]) {
j++;
i = w[k];
w[k] = w[k-1];
w[k-1] = i;
i = o[k];
o[k] = o[k-1];
o[k-1] = i;
}
}
}
else
return;
*pbp++ = makem(w[0] / 2);
for (k = 0; o[k]; k++)
;
while (k>0) {
k--;
*pbp++ = makem(-((w[k] + w[k+1]) / 2));
*pbp++ = o[k];
}
}
void setbra(void)
{
int k;
Tchar i, *j, dwn;
int cnt, delim;
Tchar brabuf[NC];
if (ismot(i = getch()))
return;
delim = cbits(i);
j = brabuf + 1;
cnt = 0;
if (NROFF)
dwn = (2 * t.Halfline) | MOT | VMOT;
else
dwn = EM | MOT | VMOT;
while ((k = cbits(i = getch())) != delim && k != '\n' && j <= brabuf + NC - 4) {
*j++ = i | ZBIT;
*j++ = dwn;
cnt++;
}
if (--cnt < 0)
return;
else if (!cnt) {
ch = *(j - 2);
return;
}
*j = 0;
if (NROFF)
*--j = *brabuf = (cnt * t.Halfline) | MOT | NMOT | VMOT;
else
*--j = *brabuf = (cnt * EM) / 2 | MOT | NMOT | VMOT;
*--j &= ~ZBIT;
pushback(brabuf);
}
void setvline(void)
{
int i;
Tchar c, rem, ver, neg;
int cnt, delim, v;
Tchar vlbuf[NC];
Tchar *vlp;
if (ismot(c = getch()))
return;
delim = cbits(c);
dfact = lss;
vflag++;
i = quant(atoi0(), VERT);
dfact = 1;
if (!i) {
eat(delim);
vflag = 0;
return;
}
if ((cbits(c = getch())) == delim) {
c = BOXRULE | chbits; /*default box rule*/
} else
getch();
c |= ZBIT;
neg = 0;
if (i < 0) {
i = -i;
neg = NMOT;
}
if (NROFF)
v = 2 * t.Halfline;
else {
v = EM;
if (v < VERT) /* ATT EVK hack: Erik van Konijnenburg, */
v = VERT; /* hvlpb!evkonij, ATT NSI Hilversum, Holland */
}
cnt = i / v;
rem = makem(i % v) | neg;
ver = makem(v) | neg;
vlp = vlbuf;
if (!neg)
*vlp++ = ver;
if (absmot(rem) != 0) {
*vlp++ = c;
*vlp++ = rem;
}
while (vlp < vlbuf + NC - 3 && cnt--) {
*vlp++ = c;
*vlp++ = ver;
}
*(vlp - 2) &= ~ZBIT;
if (!neg)
vlp--;
*vlp = 0;
pushback(vlbuf);
vflag = 0;
}
#define NPAIR (NC/2-6) /* max pairs in spline, etc. */
void setdraw(void) /* generate internal cookies for a drawing function */
{
int i, j, k, dx[NPAIR], dy[NPAIR], delim, type;
Tchar c, drawbuf[NC];
int drawch = '.'; /* character to draw with */
/* input is \D'f dx dy dx dy ... c' (or at least it had better be) */
/* this does drawing function f with character c and the */
/* specified dx,dy pairs interpreted as appropriate */
/* pairs are deltas from last point, except for radii */
/* l dx dy: line from here by dx,dy */
/* c x: circle of diameter x, left side here */
/* e x y: ellipse of diameters x,y, left side here */
/* a dx1 dy1 dx2 dy2:
ccw arc: ctr at dx1,dy1, then end at dx2,dy2 from there */
/* ~ dx1 dy1 dx2 dy2...:
spline to dx1,dy1 to dx2,dy2 ... */
/* b x c:
built-up character of type c, ht x */
/* f dx dy ...: f is any other char: like spline */
if (ismot(c = getch()))
return;
delim = cbits(c);
numerr.escarg = type = cbits(getch());
if (type == '~') /* head off the .tr ~ problem */
type = 's';
for (i = 0; i < NPAIR ; i++) {
skip();
vflag = 0;
dfact = EM;
dx[i] = quant(atoi0(), HOR);
if (dx[i] > MAXMOT)
dx[i] = MAXMOT;
else if (dx[i] < -MAXMOT)
dx[i] = -MAXMOT;
skip();
if (type == 'c') {
dy[i] = 0;
goto eat;
}
vflag = 1;
dfact = lss;
dy[i] = quant(atoi0(), VERT);
if (dy[i] > MAXMOT)
dy[i] = MAXMOT;
else if (dy[i] < -MAXMOT)
dy[i] = -MAXMOT;
eat:
if (cbits(c = getch()) != ' ') { /* must be the end */
if (cbits(c) != delim) {
drawch = cbits(c);
getch();
}
i++;
break;
}
}
dfact = 1;
vflag = 0;
if (TROFF) {
drawbuf[0] = DRAWFCN | chbits | ZBIT;
drawbuf[1] = type | chbits | ZBIT;
drawbuf[2] = drawch | chbits | ZBIT;
for (k = 0, j = 3; k < i; k++) {
drawbuf[j++] = MOT | ((dx[k] >= 0) ? dx[k] : (NMOT | -dx[k]));
drawbuf[j++] = MOT | VMOT | ((dy[k] >= 0) ? dy[k] : (NMOT | -dy[k]));
}
if (type == DRAWELLIPSE) {
drawbuf[5] = drawbuf[4] | NMOT; /* so the net vertical is zero */
j = 6;
} else if (type == DRAWBUILD) {
drawbuf[4] = drawbuf[3] | NMOT; /* net horizontal motion is zero */
drawbuf[2] &= ~ZBIT; /* width taken from drawing char */
j = 5;
}
drawbuf[j++] = DRAWFCN | chbits | ZBIT; /* marks end for ptout */
drawbuf[j] = 0;
pushback(drawbuf);
}
}
void casefc(void)
{
int i;
Tchar j;
gchtab[fc] &= ~FCBIT;
fc = IMP;
padc = ' ';
if (skip() || ismot(j = getch()) || (i = cbits(j)) == '\n')
return;
fc = i;
gchtab[fc] |= FCBIT;
if (skip() || ismot(ch) || (ch = cbits(ch)) == fc)
return;
padc = ch;
}
Tchar setfield(int x)
{
Tchar ii, jj, *fp;
int i, j;
int length, ws, npad, temp, type;
Tchar **pp, *padptr[NPP];
Tchar fbuf[FBUFSZ];
int savfc, savtc, savlc;
Tchar rchar;
int savepos;
static Tchar wbuf[] = { WORDSP, 0};
if (x == tabch)
rchar = tabc | chbits;
else if (x == ldrch)
rchar = dotc | chbits;
temp = npad = ws = 0;
savfc = fc;
savtc = tabch;
savlc = ldrch;
tabch = ldrch = fc = IMP;
savepos = numtabp[HP].val;
gchtab[tabch] &= ~TABBIT;
gchtab[ldrch] &= ~LDRBIT;
gchtab[fc] &= ~FCBIT;
gchtab[IMP] |= TABBIT|LDRBIT|FCBIT;
for (j = 0; ; j++) {
if ((tabtab[j] & TABMASK) == 0) {
if (x == savfc)
ERROR "zero field width." WARN;
jj = 0;
goto rtn;
}
if ((length = ((tabtab[j] & TABMASK) - numtabp[HP].val)) > 0 )
break;
}
type = tabtab[j] & ~TABMASK;
fp = fbuf;
pp = padptr;
if (x == savfc) {
while (1) {
j = cbits(ii = getch());
jj = width(ii);
widthp = jj;
numtabp[HP].val += jj;
if (j == padc) {
npad++;
*pp++ = fp;
if (pp > padptr + NPP - 1)
break;
goto s1;
} else if (j == savfc)
break;
else if (j == '\n') {
temp = j;
if (nlflg && ip == 0) {
numtabp[CD].val--;
nlflg = 0;
}
break;
}
ws += jj;
s1:
*fp++ = ii;
if (fp > fbuf + FBUFSZ - 3)
break;
}
if (ws)
*fp++ = WORDSP;
if (!npad) {
npad++;
*pp++ = fp;
*fp++ = 0;
}
*fp++ = temp;
*fp = 0;
temp = i = (j = length - ws) / npad;
i = (i / HOR) * HOR;
if ((j -= i * npad) < 0)
j = -j;
ii = makem(i);
if (temp < 0)
ii |= NMOT;
for (; npad > 0; npad--) {
*(*--pp) = ii;
if (j) {
j -= HOR;
(*(*pp)) += HOR;
}
}
pushback(fbuf);
jj = 0;
} else if (type == 0) {
/*plain tab or leader*/
if ((j = width(rchar)) > 0) {
int nchar = length / j;
while (nchar-->0 && pbp < &pbbuf[NC-3]) {
numtabp[HP].val += j;
widthp = j;
*pbp++ = rchar;
}
length %= j;
}
if (length)
jj = length | MOT;
else
jj = getch0();
if (savepos > 0)
pushback(wbuf);
} else {
/*center tab*/
/*right tab*/
while ((j = cbits(ii = getch())) != savtc && j != '\n' && j != savlc) {
jj = width(ii);
ws += jj;
numtabp[HP].val += jj;
widthp = jj;
*fp++ = ii;
if (fp > fbuf + FBUFSZ - 3)
break;
}
*fp++ = ii;
*fp = 0;
if (type == RTAB)
length -= ws;
else
length -= ws / 2; /*CTAB*/
pushback(fbuf);
if ((j = width(rchar)) != 0 && length > 0) {
int nchar = length / j;
while (nchar-- > 0 && pbp < &pbbuf[NC-3])
*pbp++ = rchar;
length %= j;
}
if (savepos > 0)
pushback(wbuf);
length = (length / HOR) * HOR;
jj = makem(length);
if (nlflg) {
if (ip == 0)
numtabp[CD].val--;
nlflg = 0;
}
}
rtn:
gchtab[fc] &= ~FCBIT;
gchtab[tabch] &= ~TABBIT;
gchtab[ldrch] &= ~LDRBIT;
fc = savfc;
tabch = savtc;
ldrch = savlc;
gchtab[fc] |= FCBIT;
gchtab[tabch] = TABBIT;
gchtab[ldrch] |= LDRBIT;
numtabp[HP].val = savepos;
return(jj);
}