118 lines
2.4 KiB
C++
118 lines
2.4 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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strncpy.c
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NLS/DBCS-aware string class: strncpy method
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This file contains the implementation of the strncpy 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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gregj 04/08/93 Created
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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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/*******************************************************************
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NAME: NLS_STR::strncpy
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SYNOPSIS: Copy non-null-terminated string
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ENTRY: pchSource - string to copy
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cbSource - number of bytes to copy
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EXIT: If successful, contents of string overwritten.
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If failed, the original contents of the string remain.
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RETURNS: Reference to self.
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HISTORY:
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gregj 04/08/93 Created
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********************************************************************/
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NLS_STR& NLS_STR::strncpy( const CHAR *pchSource, UINT cbSource )
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{
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if ( cbSource == 0)
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pchSource = NULL;
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if ( pchSource == NULL )
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{
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if ( !IsOwnerAlloc() && !QueryAllocSize() )
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{
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if ( !Alloc(1) )
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ReportError( WN_OUT_OF_MEMORY );
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return *this;
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}
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UIASSERT( QueryAllocSize() > 0 );
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*_pchData = '\0';
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_cchLen = 0;
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}
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else
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{
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if ( !IsOwnerAlloc() )
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{
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if ( (UINT)QueryAllocSize() < cbSource + 1 )
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{
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CHAR * pchNew = new CHAR[cbSource + 1];
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if ( pchNew == NULL )
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{
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ReportError( WN_OUT_OF_MEMORY );
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return *this;
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}
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delete _pchData;
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_pchData = pchNew;
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_cbData = cbSource + 1;
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}
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}
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else
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{
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if ((UINT)QueryAllocSize() < cbSource + 1)
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cbSource = QueryAllocSize() - 1;
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}
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::strncpyf( _pchData, pchSource, cbSource );
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/*
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* Get the new length of the string. It may not necessarily be
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* cbSource because if the string is getting truncated, cbSource
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* might be halfway through a double-byte character.
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*/
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_pchData[cbSource] = '\0';
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_cchLen = ::strlenf( _pchData );
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}
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IncVers();
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/* Reset the error state, since the string is now valid.
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*/
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ReportError( WN_SUCCESS );
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return *this;
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}
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