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

/*	setmat.c	4.1	83/03/09	*/
/*
 * 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
d755da8b RC	1	/* setmat.c 4.1 83/03/09 */
	2	/*
	3	* setmat: set the value in m[r, c] to nval.
	4	*/
	5
	6	#include "bit.h"
	7
	8	setmat(m, rows, cols, r, c, nval)
	9	bitmat m;
	10	int rows, cols, r, c, nval;
	11	{
	12	register int offset, thisbit;
	13
	14	if (r<0 \|\| c<0 \|\| r>=rows \|\| c>=cols) {
	15	#ifdef TRACE
	16	if (trace)
	17	fprintf(trace, "setmat range error: (%d, %d) <- %d in a (%d, %d) matrix %x\n", r, c, nval, rows, cols, m);
	18	#endif
	19
	20	return;
	21	}
	22	offset = r*((cols+7)>>3) + (c>>3);
	23	thisbit = 0x80 >> (c&7);
	24	if (nval)
	25	m[offset] \|= thisbit;
	26	else
	27	m[offset] &= ~thisbit;
	28	}