79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
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/****************************************************************
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* *
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* Copyright 2010 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 "gtm_utf8.h"
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GBLREF boolean_t badchar_inhibit;
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void op_fnzsubstr(mval* src, int first, int byte_width, mval* dest)
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{
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char *srcbase, *srctop, *srcptr, *tmpptr;
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int bytelen, skip;
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boolean_t src_is_singlebyte;
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MV_FORCE_STR(src);
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MV_INIT(dest);
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dest->mvtype = MV_STR;
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if (first <= 0)
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first = 1;
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if (first > src->str.len || byte_width <= 0)
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{
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dest->str.len = 0;
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return;
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}
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srctop = src->str.addr + src->str.len;
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UNICODE_ONLY(if (!gtm_utf8_mode || (src_is_singlebyte = MV_IS_SINGLEBYTE(src)))) /* entirely single byte string */
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srcbase = src->str.addr + first - 1;
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# ifdef UNICODE_SUPPORTED
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else
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{ /* generic extraction of a multi-byte string */
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for (srcbase = src->str.addr, skip = first - 1; (skip > 0 && srcbase < srctop); --skip)
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{ /* advance to the beginning of the character position 'first' */
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if (!UTF8_VALID(srcbase, srctop, bytelen) && !badchar_inhibit)
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UTF8_BADCHAR(0, srcbase, srctop, 0, NULL);
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srcbase += bytelen;
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}
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if (skip > 0)
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{ /* the first character position is past the last character */
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dest->str.len = 0;
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return;
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}
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}
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# endif
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dest->str.addr = srcbase;
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if (srctop - srcbase > byte_width)
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{
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srcptr = srcbase + byte_width;
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# ifdef UNICODE_SUPPORTED
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if (gtm_utf8_mode)
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{
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if (src_is_singlebyte)
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{ /* if source is entirely single byte, so is destination */
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dest->str.char_len = byte_width;
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dest->mvtype |= MV_UTF_LEN;
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} else
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{ /* adjust to the leading byte of the last character that contains the byte at srcptr */
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UTF8_LEADING_BYTE(srcptr, srcbase, tmpptr);
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srcptr = tmpptr;
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}
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}
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# endif
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dest->str.len = INTCAST(srcptr - srcbase);
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} else /* width exceeds the length, so return the rest of the entire string */
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dest->str.len = INTCAST(srctop - srcbase);
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# ifdef UNICODE_SUPPORTED
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if (gtm_utf8_mode && !src_is_singlebyte && !badchar_inhibit)
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MV_FORCE_LEN(dest); /* catch BADCHAR (if any) */
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# endif
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}
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