driver.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

#ifndef lint
static	char	*sccsid = "@(#)driver.c	4.1	(ULTRIX)	7/17/90";
#endif lint

/************************************************************************
 *									*
 *			Copyright (c) 1985 by				*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any  other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived  from  software  received  from  the	*
 *   University    of   California,   Berkeley,   and   from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is  subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or  reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/

/*
 *			Modification History				
 *									
 *	David L Ballenger, 25-Apr-1985					
 * 001	Change name of local function gets() to getstr() to prevent	
 *	conflicts with gets() function from <stdio.h>.			
 * 									
 *	Pradeep Chetal, 10-April-1989					
 * 002  Added '-r' option from 4.3BSD for resolution, and added '-c' option
 *	to specify initial color for certain devices (plotters).
 *	The -c option is used only for LVP16's at present.
 *	Also added 'xmax' and 'ymax' parameters which are defined in the
 *	device LVP16 libraries. These take advantage of the '-l' & '-w' options
 *	passed to plot(1) which were never used otherwise.
 */


#include <stdio.h>

#ifdef LVP16
extern int xmax;
extern int ymax;
#endif LVP16

float deltx;
float delty;
int PlotRes;
int colour = 1;

main(argc,argv)  
     int argc;
     char **argv; 
{
	int std=1;
	FILE *fin;

	while(argc-- > 1) {
		if(*argv[1] == '-')
			switch(argv[1][1]) {
				case 'l':
#ifdef LVP16
					xmax = atoi(&argv[1][2]);
#endif LVP16
					deltx = atoi(&argv[1][2]) - 1;
					break;
				case 'w':
#ifdef LVP16
					ymax = atoi(&argv[1][2]);
#endif LVP16
					delty = atoi(&argv[1][2]) - 1;
					break;
				case 'r':
					PlotRes = atoi(&argv[1][2]);
					break;
				case 'c':
					colour = atoi(&argv[1][2]);
					break;
				}

		else {
			std = 0;
			if ((fin = fopen(argv[1], "r")) == NULL) {
				fprintf(stderr, "can't open %s\n", argv[1]);
				exit(1);
				}
			fplt(fin);
			}
		argv++;
		}
	if (std)
		fplt( stdin );
	exit(0);
	}


fplt(fin)  
FILE *fin; 
{
	int c;
	char s[256];
	int xi,yi,x0,y0,x1,y1,r,dx,n,i;
	int pat[256];

	openpl();
#ifdef LVP16
	if (colour != 1) color(colour);
#endif LVP16
	while((c=getc(fin)) != EOF){
		switch(c){
		case 'm':
			xi = getsi(fin);
			yi = getsi(fin);
			move(xi,yi);
			break;
		case 'l':
			x0 = getsi(fin);
			y0 = getsi(fin);
			x1 = getsi(fin);
			y1 = getsi(fin);
			line(x0,y0,x1,y1);
			break;
		case 't':
			getstr(s,fin);
			label(s);
			break;
		case 'e':
			erase();
			break;
		case 'p':
			xi = getsi(fin);
			yi = getsi(fin);
			point(xi,yi);
			break;
		case 'n':
			xi = getsi(fin);
			yi = getsi(fin);
			cont(xi,yi);
			break;
		case 's':
			x0 = getsi(fin);
			y0 = getsi(fin);
			x1 = getsi(fin);
			y1 = getsi(fin);
			space(x0,y0,x1,y1);
			break;
		case 'a':
			xi = getsi(fin);
			yi = getsi(fin);
			x0 = getsi(fin);
			y0 = getsi(fin);
			x1 = getsi(fin);
			y1 = getsi(fin);
			arc(xi,yi,x0,y0,x1,y1);
			break;
		case 'c':
			xi = getsi(fin);
			yi = getsi(fin);
			r = getsi(fin);
			circle(xi,yi,r);
			break;
		case 'f':
			getstr(s,fin);
			linemod(s);
			break;
		case 'd':
			xi = getsi(fin);
			yi = getsi(fin);
			dx = getsi(fin);
			n = getsi(fin);
			for(i=0; i<n; i++)pat[i] = getsi(fin);
			dot(xi,yi,dx,n,pat);
			break;
			}
		}
	closepl();
	}
getsi(fin)  FILE *fin; {	/* get an integer stored in 2 ascii bytes. */
	short a, b;
	if((b = getc(fin)) == EOF)
		return(EOF);
	if((a = getc(fin)) == EOF)
		return(EOF);
	a = a<<8;
	return(a|b);
}
getstr(s,fin)  char *s;  FILE *fin; {
	for( ; *s = getc(fin); s++)
		if(*s == '\n')
			break;
	*s = '\0';
	return;
}