fis-gtm/sr_port/op_fnzbitcoun.c

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/****************************************************************
* *
* Copyright 2001, 2005 Fidelity Information Services, Inc *
* *
* This source code contains the intellectual property *
* of its copyright holder(s), and is made available *
* under a license. If you do not know the terms of *
* the license, please stop and do not read further. *
* *
****************************************************************/
#include "mdef.h"
#include "op.h"
#include "mvalconv.h"
void op_fnzbitcoun(mval *dst, mval *bitstr)
{
int str_len;
unsigned char *byte_1, *byte_n, byte_0;
int m, n, i;
int bit_count;
static unsigned char mask[8] = {128, 64, 32, 16, 8, 4, 2, 1};
error_def(ERR_INVBITSTR);
MV_FORCE_STR(bitstr);
if (!bitstr->str.len)
rts_error(VARLSTCNT(1) ERR_INVBITSTR);
byte_1 = (unsigned char *)bitstr->str.addr;
str_len = (bitstr->str.len - 1) * 8;
if (7 < *byte_1)
rts_error(VARLSTCNT(1) ERR_INVBITSTR);
n = (str_len - *byte_1 + 7)/8 - 1;
m = (str_len - *byte_1) % 8;
if (0 == m)
m = 8;
bit_count = 0;
for (byte_n = byte_1 + 1; byte_n <= (byte_1 + n); byte_n++)
{
for (i = 0; 8 > i; i++)
{
if (byte_0 = *byte_n & mask[i])
bit_count++;
}
}
for (i = 0; i < m; i++)
{
if (byte_0 = *byte_n & mask[i])
bit_count++;
}
MV_FORCE_MVAL(dst, bit_count);
}