117 lines
2.7 KiB
C++
117 lines
2.7 KiB
C++
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/*****************************************************************/
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/** Microsoft Windows for Workgroups **/
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/** Copyright (C) Microsoft Corp., 1991-1992 **/
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/*****************************************************************/
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/*
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strqss.cxx
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NLS/DBCS-aware string class: QuerySubStr method
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This file contains the implementation of the QuerySubStr method
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for the STRING class. It is separate so that clients of STRING which
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do not use this operator need not link to it.
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FILE HISTORY:
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beng 01/18/91 Separated from original monolithic .cxx
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beng 02/07/91 Uses lmui.hxx
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*/
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#include "npcommon.h"
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extern "C"
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{
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#include <netlib.h>
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}
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#if defined(DEBUG)
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static const CHAR szFileName[] = __FILE__;
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#define _FILENAME_DEFINED_ONCE szFileName
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#endif
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#include <npassert.h>
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#include <npstring.h>
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// Magic value used below
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//
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#define CB_ENTIRE_STRING (-1)
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/*******************************************************************
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NAME: NLS_STR::QuerySubStr
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SYNOPSIS: Return a pointer to a new NLS_STR that contains the contents
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of *this from istrStart to:
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istrStart end of string or
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istrStart + istrEnd
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ENTRY:
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EXIT:
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RETURNS: Pointer to newly alloc'd NLS_STR, or NULL if error
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NOTES: The private method QuerySubStr(ISTR&, CB) is the worker
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method, the other two just check the parameters and
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pass the data. It is private since we can't allow the
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user to access the string on a byte basis
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CAVEAT: Note that this method creates an NLS_STR that the client is
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responsible for deleting.
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HISTORY:
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johnl 11/26/90 Created
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beng 04/26/91 Replaced CB wth INT; broke out CB_ENTIRE_STRING
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magic value
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beng 07/23/91 Allow on erroneous string; simplified CheckIstr
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********************************************************************/
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NLS_STR * NLS_STR::QuerySubStr( const ISTR & istrStart, INT cbLen ) const
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{
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if (QueryError())
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return NULL;
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CheckIstr( istrStart );
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INT cchStrLen = ::strlenf(QueryPch(istrStart) );
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INT cbCopyLen = ( cbLen == CB_ENTIRE_STRING || cbLen >= cchStrLen )
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? cchStrLen
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: cbLen;
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NLS_STR *pnlsNew = new NLS_STR( cbCopyLen + 1 );
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if ( pnlsNew == NULL )
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return NULL;
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if ( pnlsNew->QueryError() )
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{
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delete pnlsNew;
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return NULL;
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}
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::memcpyf( pnlsNew->_pchData, QueryPch(istrStart), cbCopyLen );
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*(pnlsNew->_pchData + cbCopyLen) = '\0';
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pnlsNew->_cchLen = cbCopyLen;
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return pnlsNew;
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}
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NLS_STR * NLS_STR::QuerySubStr( const ISTR & istrStart ) const
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{
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return QuerySubStr( istrStart, CB_ENTIRE_STRING );
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}
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NLS_STR * NLS_STR::QuerySubStr( const ISTR & istrStart,
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const ISTR & istrEnd ) const
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{
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CheckIstr( istrEnd );
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UIASSERT( istrEnd.QueryIB() >= istrStart.QueryIB() );
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return QuerySubStr( istrStart, istrEnd - istrStart );
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}
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