linemod.c

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· C语言 代码 · 共 83 行

#ifndef lint
static char SccsId[] = " @(#)linemod.c	4.1	(ULTRIX)	7/2/90";
#endif not(lint)

/*
 * Modification History
 *
 * 	April-11-1989, Pradeep Chetal
 *	Added changes from 4.3Tahoe BSD for lots of new drivers
 */

/*
 * 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[] = "@(#)linemod.c	5.1 (Berkeley) 5/7/85";
#endif not lint

#include "hp7221.h"

linemod( line )
char	*line;
{
	/*
	 * Note that the bit patterns could be compacted using the
	 *  repeat field conventions.  They aren't for clarity.
	 *  Examples of almost identical packed patterns are in the
	 *  comments.
	 *  If linemod is changed really often, a ~15% savings
	 *  could be achieved.
	 */
	if ( *(line) == 's' ) {
		if ( *(++line) == 'o' ) {
			/*
			 * solid mode 1
			 */
			printf( "vA" );
			return;
		}
		else if ( *(line) == 'h' ) {
			/*
			 * shortdashed mode 4
			 */
			printf( "vD" );
			return;
		}
	}
	else if ( *(line) == 'd' ) {
		if ( *(++line) == 'o' && *(++line) == 't' ) {
			if ( *(++line) == 't' ) {
				/*
				 * dotted mode 2
				 *  printf( "W(P00001)" );
				 */
				printf( "vB" );
				return;
			}
			else if ( *(line) == 'd' ) {
				/*
				 * dotdashed mode 3
				 *  printf( "W(P0110010)" );
				 */
				printf( "vC" );
				return;
			}
		}
	}
	else if ( *(line) == 'l' ) {
		/*
		 * longdashed mode 5
		 *  printf( "W(P11100)" );
		 */
		printf( "vE" );
		return;
	}
	printf( "vA" );
	return;
}