open.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

#ifndef lint
static char sccsid[] = "@(#)open.c	4.1 (Berkeley) 6/27/83";
#endif

#
#include <sgtty.h>
/* gsi plotting output routines */
# define DOWN 012
# define UP 013
# define LEFT 010
# define RIGHT 040
# define BEL 007
# define ACK 006
# define CR 015
# define FF 014
# define VERTRESP 48
# define HORZRESP 60.
# define HORZRES 6.
# define VERTRES 8.
/* down is line feed, up is reverse oyne feed,
   left is bwckspace, right is space.  48 points per inch
   vertically, 60 horizontally */

int xnow, ynow;
int OUTF;
struct sgttyb ITTY, PTTY;
float HEIGHT = 6.0, WIDTH = 6.0, OFFSET = 0.0;
int xscale, xoffset, yscale;
float botx = 0., boty = 0., obotx = 0., oboty = 0.;
float scalex = 1., scaley = 1.;

openpl ()
{
	int reset();
		xnow = ynow = 0;
		OUTF = 1;
		printf("\r");
		gtty(OUTF, &ITTY);
		signal (2, reset);
		PTTY = ITTY;
		PTTY.sg_flags &= ~CRMOD;	/* don't map lf */
		/* initialize constants */
		xscale  = 4096./(HORZRESP * WIDTH);
		yscale = 4096 /(VERTRESP * HEIGHT);
		xoffset = OFFSET * HORZRESP;
		return;
}

openvt(){
openpl();
}