68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
/****************************************************************
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* *
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* Copyright 2001, 2009 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 "stringpool.h"
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#include "op.h"
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GBLREF spdesc stringpool;
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static const unsigned char mask[8]={0xFF,0xFE,0xFC,0xF8,0xF0,0xE0,0xC0,0x80};
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void op_fnzbitxor(mval *dst, mval *bitstr1, mval *bitstr2)
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{
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int n, str_len1, str_len2, new_str_len;
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unsigned char *byte_1, *byte_n;
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unsigned char *byte1_1, *byte1_n, byte1_len;
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unsigned char *byte2_1, *byte2_n, byte2_len;
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error_def(ERR_INVBITSTR);
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MV_FORCE_STR(bitstr1);
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MV_FORCE_STR(bitstr2);
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if (!bitstr1->str.len || !bitstr2->str.len)
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rts_error(VARLSTCNT(1) ERR_INVBITSTR);
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byte1_len = *(unsigned char *)bitstr1->str.addr;
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str_len1 = (bitstr1->str.len - 1) * 8;
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if (7 < byte1_len)
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rts_error(VARLSTCNT(1) ERR_INVBITSTR);
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byte2_len = *(unsigned char *)bitstr2->str.addr;
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str_len2 = (bitstr2->str.len -1) * 8;
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if (7 < byte2_len)
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rts_error(VARLSTCNT(1) ERR_INVBITSTR);
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if (str_len1 - byte1_len > str_len2 - byte2_len)
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new_str_len = str_len2 - byte2_len;
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else
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new_str_len = str_len1 - byte1_len;
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n = (new_str_len + 7)/8 ;
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ENSURE_STP_FREE_SPACE(n + 1);
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byte_1 = (unsigned char *)stringpool.free;
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*byte_1 = n * 8 - new_str_len;
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byte1_1 = (unsigned char *)bitstr1->str.addr;
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byte2_1 = (unsigned char *)bitstr2->str.addr;
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for(byte_n = byte_1 + 1, byte1_n = byte1_1 + 1, byte2_n = byte2_1 + 1 ;
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byte_n <= (byte_1 + n); byte_n++, byte1_n++, byte2_n++)
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{
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*byte_n = *byte1_n ^ *byte2_n;
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}
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*--byte_n &= mask[*byte_1];
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dst->mvtype = MV_STR;
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dst->str.addr = (char *)stringpool.free;
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dst->str.len = n + 1;
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stringpool.free += n + 1;
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}
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