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VIDEO.C
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Text File
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1987-02-07
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2KB
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79 lines
void bkscroll(lcol,trow,rcol,brow,lines) /* scroll a screen area down */
int lcol, trow, rcol, brow, lines;
{
union REGS inregs;
union REGS outregs;
inregs.h.ah = 15; /* get active display page */
int86(0x10,&inregs,&outregs);
inregs.h.bh = outregs.h.bh;
inregs.h.dl = --lcol;
inregs.h.dh = --trow;
inregs.h.ah = 2; /* set cursor position */
int86(0x10,&inregs,&outregs);
inregs.h.ah = 8; /* get color/attribute */
int86(0x10,&inregs,&outregs);
inregs.h.bh = outregs.h.ah;
inregs.h.cl = lcol;
inregs.h.ch = trow;
inregs.h.dl = --rcol;
inregs.h.dh = --brow;
inregs.h.al = lines;
inregs.h.ah = 7; /* do the backscroll */
int86(0x10,&inregs,&outregs);
}
void clreol() /* clear from cursor to end of line */
{
union REGS inregs;
union REGS outregs;
int attr, columns;
inregs.h.ah = 15; /* get display page, columns */
int86(0x10,&inregs,&outregs);
inregs.h.bh = outregs.h.bh;
columns = outregs.h.ah;
inregs.h.ah = 8; /* get color/attribute */
int86(0x10,&inregs,&outregs);
attr = outregs.h.ah;
inregs.h.ah = 3; /* get cursor position */
int86(0x10,&inregs,&outregs);
inregs.h.bl = attr;
inregs.x.cx = columns - outregs.h.dl;
inregs.x.ax = 0x0920; /* write spaces until EOLN */
int86(0x10,&inregs,&outregs);
}
void scroll(lcol,trow,rcol,brow,lines) /* scroll a screen area up */
int lcol, trow, rcol, brow, lines;
{
union REGS inregs;
union REGS outregs;
inregs.h.ah = 15; /* get active display page */
int86(0x10,&inregs,&outregs);
inregs.h.bh = outregs.h.bh;
inregs.h.dl = --lcol;
inregs.h.dh = --trow;
inregs.h.ah = 2; /* set cursor position */
int86(0x10,&inregs,&outregs);
inregs.h.ah = 8; /* get color/attribute */
int86(0x10,&inregs,&outregs);
inregs.h.bh = outregs.h.ah;
inregs.h.cl = lcol;
inregs.h.ch = trow;
inregs.h.dl = --rcol;
inregs.h.dh = --brow;
inregs.h.al = lines;
inregs.h.ah = 6; /* do the scroll */
int86(0x10,&inregs,&outregs);
}