[unix-history] / usr / src / old / lib2648 / emptyrow.c

/*
 * 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[] = "@(#)emptyrow.c	5.1 (Berkeley) 4/30/85";
#endif not lint

/*
 * emptyrow: returns true if row r of m is all zeros.
 *
 * Note that we assume the garbage at the end of the
 * row is all zeros.
 */

#include "bit.h"

emptyrow(m, rows, cols, r)
bitmat m;
int rows, cols, r;
{
	char *top, *bot;

	bot = &m[r*((cols+7)>>3)];
	top = bot + ((cols-1) >> 3);
	while (bot <= top)
		if (*bot++)
			return(0);
	return (1);
}
Commit	Line	Data
051b1e55 DF	1	/*
	2	* Copyright (c) 1980 Regents of the University of California.
	3	* All rights reserved. The Berkeley software License Agreement
	4	* specifies the terms and conditions for redistribution.
	5	*/
	6
	7	#ifndef lint
95f51977	8	static char sccsid[] = "@(#)emptyrow.c 5.1 (Berkeley) 4/30/85";
051b1e55 DF	9	#endif not lint
051b1e55 DF	10
4baffcae RC	11	/*
	12	* emptyrow: returns true if row r of m is all zeros.
	13	*
	14	* Note that we assume the garbage at the end of the
	15	* row is all zeros.
	16	*/
	17
	18	#include "bit.h"
	19
	20	emptyrow(m, rows, cols, r)
	21	bitmat m;
	22	int rows, cols, r;
	23	{
	24	char top, bot;
	25
	26	bot = &m[r*((cols+7)>>3)];
	27	top = bot + ((cols-1) >> 3);
	28	while (bot <= top)
	29	if (*bot++)
	30	return(0);
	31	return (1);
	32	}