bit_count_c

	num_set_bits.i4.v = bit_count_c(byte_array.g.v, start_bit.i4.v,
					num_bits.i4.v, lowest_bit_set.i4.r,
					highest_bit_set.i4.r)

	This routine counts the number of set bits in a byte string.
	A little endian byte ordering is assumed.

	byte_array	byte or array of bytes to test
	start_bit	starting bit number (starts at 1)
	num_bits	number of bits to test
	lowest_bit_set	bit number of lowest set bit found (starts at 1)
			(If this value is not needed, a value of NULL
			 can be passed.)
	highest_bit_set	bit number of highest set bit found (starts at 1)
			(If this value is not needed, a value of NULL
			 can be passed.)

	This function returns status values as follows:

	CLIB_INVARG		invalid starting bit number or number of bits
	otherwise		number of set bits

	This function requires the following include files:

	cnsparam_h, clib_h

	Related functions:

	masked_off_bit_count_c, tstbit(_c), setbit(_c), rstbit(_c),
	bit_field_circular_shift_c, icshft

	C/C++ usage:

	int	num_set_bits;
	int	byte_array = VALUE;
	int	start_bit = 1;
	int	num_bits = 32;
	int	lowest_bit_set;
	int	highest_bit_set;

	num_set_bits = bit_count_c((void *) &byte_array,start_bit,num_bits,
				   &lowest_bit_set,&highest_bit_set);