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