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

/*	emptyrow.c	4.1	83/03/09	*/
/*
 * 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
4baffcae RC	1	/* emptyrow.c 4.1 83/03/09 */
	2	/*
	3	* emptyrow: returns true if row r of m is all zeros.
	4	*
	5	* Note that we assume the garbage at the end of the
	6	* row is all zeros.
	7	*/
	8
	9	#include "bit.h"
	10
	11	emptyrow(m, rows, cols, r)
	12	bitmat m;
	13	int rows, cols, r;
	14	{
	15	char top, bot;
	16
	17	bot = &m[r*((cols+7)>>3)];
	18	top = bot + ((cols-1) >> 3);
	19	while (bot <= top)
	20	if (*bot++)
	21	return(0);
	22	return (1);
	23	}