4.4BSD/usr/src/lib/libplot/dumb/open.c

/*-
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This module is believed to contain source code proprietary to AT&T.
 * Use and redistribution is subject to the Berkeley Software License
 * Agreement and your Software Agreement with AT&T (Western Electric).
 */

#ifndef lint
static char sccsid[] = "@(#)open.c	8.1 (Berkeley) 6/4/93";
#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()
{
	void 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;
}