[unix-history] / usr / src / old / lib2648 / setmat.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[] = "@(#)setmat.c	5.1 (Berkeley) %G%";
#endif not lint

/*
 * setmat: set the value in m[r, c] to nval.
 */

#include "bit.h"

setmat(m, rows, cols, r, c, nval)
bitmat m;
int rows, cols, r, c, nval;
{
	register int offset, thisbit;

	if (r<0 || c<0 || r>=rows || c>=cols) {
#ifdef TRACE
		if (trace)
			fprintf(trace, "setmat range error: (%d, %d) <- %d in a (%d, %d) matrix %x\n", r, c, nval, rows, cols, m);
#endif

		return;
	}
	offset = r*((cols+7)>>3) + (c>>3);
	thisbit = 0x80 >> (c&7);
	if (nval)
		m[offset] |= thisbit;
	else
		m[offset] &= ~thisbit;
}
Commit	Line	Data
97e3edfb 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
	8	static char sccsid[] = "@(#)setmat.c 5.1 (Berkeley) %G%";
	9	#endif not lint
	10
d755da8b RC	11	/*
	12	* setmat: set the value in m[r, c] to nval.
	13	*/
	14
	15	#include "bit.h"
	16
	17	setmat(m, rows, cols, r, c, nval)
	18	bitmat m;
	19	int rows, cols, r, c, nval;
	20	{
	21	register int offset, thisbit;
	22
	23	if (r<0 \|\| c<0 \|\| r>=rows \|\| c>=cols) {
	24	#ifdef TRACE
	25	if (trace)
	26	fprintf(trace, "setmat range error: (%d, %d) <- %d in a (%d, %d) matrix %x\n", r, c, nval, rows, cols, m);
	27	#endif
	28
	29	return;
	30	}
	31	offset = r*((cols+7)>>3) + (c>>3);
	32	thisbit = 0x80 >> (c&7);
	33	if (nval)
	34	m[offset] \|= thisbit;
	35	else
	36	m[offset] &= ~thisbit;
	37	}