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SCRINTRP.CPP
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C/C++ Source or Header
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1996-11-24
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125 lines
// +++Date last modified: 17-May-1996
// Base class for screen interpreter
// public domain
// by David Nugent <davidn@unique.blaze.net.au>
// 3:632/348@fidonet
#include <iostream.h>
#include "scrintrp.hpp"
const int scrinterp::CBUFSZ = 127;
scrinterp::scrinterp(video & v)
: vs(v),
chrbuf(new char [CBUFSZ+1]),
chridx(0),
flushevery(0),
insertmode(0)
{}
scrinterp::~scrinterp()
{
flushbuf();
delete[] chrbuf;
}
void scrinterp::reset()
{
chridx = 0;
}
// This is the basic get-a-character/display-it
// loop that is used to drive the engine
void
scrinterp::display(istream & is)
{
int ch =0;
reset();
while (is.good() && (ch = is.get()) != EOF)
putch(ch);
flushbuf();
}
void
scrinterp::flushbuf()
{
if (chridx)
{
chrbuf[chridx] = '\0';
vs.put(chrbuf);
chridx = 0;
}
}
void
scrinterp::putbuf(int ch)
{
if (chridx >= CBUFSZ)
flushbuf();
chrbuf[chridx++] = char(ch);
}
void
scrinterp::putch(int ch)
{
cell_t x, y, mx, my;
// We can handle all of the standard control chrs here
switch (ch)
{
case '\r': // CR
flushbuf();
vs.wherexy(x, y);
vs.gotoxy(0, y);
break;
case '\t': // TAB
flushbuf();
vs.wherexy(x, y);
vs.maxxy(mx, my);
x = cell_t((((x + 8) / 8) + 1) * 8);
if (x >= mx)
{
x = cell_t(x % mx);
goto dolf;
}
vs.gotoxy(x, y);
break;
case '\n': // NL
flushbuf();
vs.wherexy(x, y);
vs.maxxy(mx, my);
dolf:
if (y == cell_t(my - 1)) // On last line
vs.scroll(0, 0, mx, my, 1);
else
++y;
vs.gotoxy(x, y);
break;
case '\007': // BELL
// beep() !
break;
case '\b':
vs.wherexy(x, y);
if (x > 0)
vs.gotoxy(--x, y);
break;
case '\x0c': // LF
// Should to a cls here with home, perhaps...
break;
default:
putbuf(ch);
if (flushevery)
flushbuf();
break;
}
}