open.c

操作系统SunOS 4.1.3版本的源码

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

#ifndef lint
static char sccsid[] = "@(#)open.c 1.1 92/07/30 SMI"; /* from UCB 5.1 5/7/85 */
#endif not lint

/*
 * This accepts plot file formats and produces the appropriate plots
 * for dumb terminals.  It can also be used for printing terminals and
 * lineprinter listings, although there is no way to specify number of
 * lines and columns different from your terminal.  This would be easy
 * to change, and is left as an exercise for the reader.
 */

#include <signal.h>
#include "dumb.h"

int minX, rangeX;	/* min and range of x */
int minY, rangeY;	/* min and range of y */
int currentx,currenty;
int COLS,LINES;

/* A very large screen! (probably should use malloc) */
char screenmat[MAXCOLS][MAXLINES];

openpl()
{
	int closepl();
	int i, j;
	char *term, *getenv();
	char bp[1024];

	term = getenv("TERM");
	tgetent(bp, term);

	COLS = tgetnum("co");
	if (COLS > MAXCOLS)
		COLS = MAXCOLS;
	if (COLS < 0)
		COLS = 48;	/* lower bound on # of cols? */
	COLS--;				/* prevent auto wrap */

	LINES = tgetnum("li");
	if (LINES > MAXLINES)
		LINES = MAXLINES;
	if (LINES < 0)
		LINES = 20;	/* lower bound on # of lines? */

	for(i=0; i<COLS; i++)
		for(j=0; j<LINES; j++)
			screenmat[i][j] = ' ';

	signal(SIGINT, closepl);
	currentx = currenty = 0;
}