45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
/****************************************************************
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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_fnzbitget(mval *dst, mval *bitstr, int pos)
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{
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int str_len;
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unsigned char *byte_1, byte_n;
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int mp, np, bn;
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error_def(ERR_INVBITSTR);
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error_def(ERR_INVBITPOS);
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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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if ((1 > pos) || (pos > str_len - *byte_1))
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rts_error(VARLSTCNT(1) ERR_INVBITPOS);
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np = ((pos + 7) / 8) - 1;
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mp = pos % 8;
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if (0 == mp)
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mp = 8;
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byte_n = *(byte_1 + np + 1);
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byte_n = byte_n << (mp - 1);
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byte_n = byte_n >> 7;
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bn = byte_n;
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MV_FORCE_MVAL(dst, bn);
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}
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