/*
 * Copyright 1990 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved. The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

 /* tu.c: draws horizontal lines */
# include "t..c"

void    drawline(int, int, int, int, int, int);

void
makeline(int i, int c, int lintype)
{
int cr, type, shortl;
type = thish(i,c);
if (type==0) return;
cr=c;
shortl = (table[i][c].col[0]=='\\');
if (c>0 && !shortl && thish(i,c-1) == type)return;
if (shortl==0)
        for(cr=c; cr < ncol && (ctype(i,cr)=='s'||type==thish(i,cr)); cr++);
else
        for(cr=c+1; cr<ncol && ctype(i,cr)=='s'; cr++);
drawline(i, c, cr-1, lintype, 0, shortl);
}

void
fullwide(int i, int lintype)
{
int cr, cl;
if (!pr1403)
        fprintf(tabout, ".nr %d \\n(.v\n.vs \\n(.vu-\\n(.sp\n", SVS);
cr= 0;
while (cr<ncol)
        {
        cl=cr;
        while (i>0 && vspand(prev(i),cl,1))
                cl++;
        for(cr=cl; cr<ncol; cr++)
                if (i>0 && vspand(prev(i),cr,1))
                        break;
        if (cl<ncol)
        drawline(i,cl,(cr<ncol?cr-1:cr),lintype,1,0);
        }
fprintf(tabout, "\n");
if (!pr1403)
        fprintf(tabout, ".vs \\n(%du\n", SVS);
}

void
drawline(int i, int cl, int cr, int lintype, int noheight, int shortl)
{
        char *exhr, *exhl, *lnch;
        int lcount, ln, linpos, oldpos, nodata;
lcount=0;
exhr=exhl= "";
switch(lintype)
        {
        case '-': lcount=1;break;
        case '=': lcount = pr1403? 1 : 2; break;
        case SHORTLINE: lcount=1; break;
        }
if (lcount<=0) return;
nodata = cr-cl>=ncol || noheight || allh(i);
        if (!nodata)
                fprintf(tabout, "\\v'-.5m'");
for(ln=oldpos=0; ln<lcount; ln++)
        {
        linpos = 2*ln - lcount +1;
        if (linpos != oldpos)
                fprintf(tabout, "\\v'%dp'", linpos-oldpos);
        oldpos=linpos;
        if (shortl==0)
        {
        tohcol(cl);
        if (lcount>1)
                {
                switch(interv(i,cl))
                        {
                        case TOP: exhl = ln==0 ? "1p" : "-1p"; break;
                        case BOT: exhl = ln==1 ? "1p" : "-1p"; break;
                        case THRU: exhl = "1p"; break;
                        }
                if (exhl[0])
                fprintf(tabout, "\\h'%s'", exhl);
                }
        else if (lcount==1)
                {
                switch(interv(i,cl))
                        {
                        case TOP: case BOT: exhl = "-1p"; break;
                        case THRU: exhl = "1p"; break;
                        }
                if (exhl[0])
                fprintf(tabout, "\\h'%s'", exhl);
                }
        if (lcount>1)
                {
                switch(interv(i,cr+1))
                        {
                        case TOP: exhr = ln==0 ? "-1p" : "+1p"; break;
                        case BOT: exhr = ln==1 ? "-1p" : "+1p"; break;
                        case THRU: exhr = "-1p"; break;
                        }
                }
        else if (lcount==1)
                {
                switch(interv(i,cr+1))
                        {
                        case TOP: case BOT: exhr = "+1p"; break;
                        case THRU: exhr = "-1p"; break;
                        }
                }
        }
        else
                fprintf(tabout, "\\h'|\\n(%du'", cl+CLEFT);
        fprintf(tabout, "\\s\\n(%d",LSIZE);
        if (linsize)
                fprintf(tabout, "\\v'-\\n(%dp/6u'", LSIZE);
        if (shortl)
                fprintf(tabout, "\\l'|\\n(%du'", cr+CRIGHT);
        else
        {
        lnch = "\\(ul";
        if (pr1403)
                lnch = lintype==2 ? "=" : "\\(ru";
        if (cr+1>=ncol)
                fprintf(tabout, "\\l'|\\n(TWu%s%s'", exhr,lnch);
        else
                fprintf(tabout, "\\l'(|\\n(%du+|\\n(%du)/2u%s%s'", cr+CRIGHT,
                        cr+1+CLEFT, exhr, lnch);
        }
        if (linsize)
                fprintf(tabout, "\\v'\\n(%dp/6u'", LSIZE);
        fprintf(tabout, "\\s0");
        }
if (oldpos!=0)
        fprintf(tabout, "\\v'%dp'", -oldpos);
if (!nodata)
        fprintf(tabout, "\\v'+.5m'");
}

void
getstop(void)
{
int i,c,k,junk, stopp;
stopp=1;
for(i=0; i<MAXLIN; i++)
        linestop[i]=0;
for(i=0; i<nlin; i++)
        for(c=0; c<ncol; c++)
                {
                k = left(i,c,&junk);
                if (k>=0 && linestop[k]==0)
                        linestop[k]= ++stopp;
                }
if (boxflg || allflg || dboxflg)
        linestop[0]=1;
}

int
left(int i, int c, int *lwidp)
{
int kind, li, lj;
        /* returns -1 if no line to left */
        /* returns number of line where it starts */
        /* stores into lwid the kind of line */
*lwidp=0;
kind = lefdata(i,c);
if (kind==0) return(-1);
if (i+1<nlin)
if (lefdata(next(i),c)== kind) return(-1);
while (i>=0 && lefdata(i,c)==kind)
        i=prev(li=i);
if (prev(li)== -1) li=0;
*lwidp=kind;
for(lj= i+1; lj<li; lj++)
        if (instead[lj] && strcmp(instead[lj], ".TH")==0)
                return(li);
for(i= i+1; i<li; i++)
        if (fullbot[i])
                li=i;
return(li);
}

int
lefdata(int i, int c)
{
int ck;
if (i>=nlin) i=nlin-1;
if (ctype(i,c) == 's')
        {
        for(ck=c; ctype(i,ck)=='s'; ck--);
        if (thish(i,ck)==0)
                return(0);
        }
i =stynum[i];
i = lefline[i][c];
if (i>0) return(i);
if (dboxflg && c==0) return(2);
if (allflg)return(1);
if (boxflg && c==0) return(1);
return(0);
}

int
next(int i)
{
while (i+1 <nlin)
        {
        i++;
        if (!fullbot[i] && !instead[i]) break;
        }
return(i);
}

int
prev(int i)
{
while (--i >=0  && (fullbot[i] || instead[i]))
        ;
return(i);
}