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357 lines
9.8 KiB
357 lines
9.8 KiB
/*****************************************************************/
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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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strload.cxx
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NLS/DBCS-aware string class: LoadString methods
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This file contains the implementation of the LoadString methods
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for the NLS_STR class. It is separate so that clients of NLS_STR who
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do not use this operator need not link to it.
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FILE HISTORY:
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rustanl 01/31/91 Created
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beng 02/07/91 Uses lmui.hxx
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gregj 03/10/92 Added caching to speed up PM ext
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gregj 04/22/93 #ifdef'd out caching to save space
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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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#include <shlwapi.h>
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#define ARRAYSIZE(a) (sizeof(a)/sizeof(a[0]))
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// we define this before we include mluisupp.h so we get code
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// instead of just prototypes
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#define MLUI_INIT
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#include <mluisupp.h>
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#ifdef RESOURCE_STRING_CACHING
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/*************************************************************************
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NAME: RESOURCE_CACHE
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SYNOPSIS: Caches a loaded resource string
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INTERFACE: RESOURCE_CACHE()
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Construct from an existing NLS_STR. Automatically
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links itself into its list.
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FindResourceCache() [friend function]
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Finds an ID in the list. If not found, returns NULL,
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else automatically promotes itself to the head of the
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list.
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AddResourceCache() [friend function]
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Set()
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Sets the cached message ID and string.
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all NLS_STR methods
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PARENT: NLS_STR
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USES:
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CAVEATS:
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NOTES:
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HISTORY:
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gregj 03/10/92 Created
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**************************************************************************/
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class RESOURCE_CACHE : public NLS_STR
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{
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friend const RESOURCE_CACHE *FindResourceCache( USHORT idMsg, RESOURCE_CACHE **ppLast,
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RESOURCE_CACHE **ppTrail );
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friend void AddResourceCache( USHORT idMsg, const NLS_STR *nls, RESOURCE_CACHE *pLast,
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RESOURCE_CACHE *pTrail );
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protected:
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USHORT _idMsg;
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RESOURCE_CACHE *_pFwd;
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static RESOURCE_CACHE *_pList;
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static INT _cItems;
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void Promote();
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public:
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RESOURCE_CACHE( USHORT idMsg, const NLS_STR &nls );
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~RESOURCE_CACHE();
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RESOURCE_CACHE & operator=( const NLS_STR & nlsSource )
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{ return (RESOURCE_CACHE&) NLS_STR::operator=( nlsSource ); }
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void Set( USHORT idMsg, const NLS_STR &nls );
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};
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RESOURCE_CACHE *RESOURCE_CACHE::_pList = NULL;
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INT RESOURCE_CACHE::_cItems = 0;
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#define RESCACHE_MAX 8 /* max number of strings to cache */
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RESOURCE_CACHE::RESOURCE_CACHE( USHORT idMsg, const NLS_STR &nls )
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: NLS_STR( MAX_RES_STR_LEN + 1 ),
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_idMsg( idMsg ),
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_pFwd( NULL )
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{
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if (QueryError() != WN_SUCCESS)
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return;
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*this = nls; /* copy contents */
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_pFwd = _pList;
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_pList = this; /* make this the new list head */
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_cItems++; /* and count this one */
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}
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RESOURCE_CACHE::~RESOURCE_CACHE()
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{
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RESOURCE_CACHE *pThis, *pTrail;
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for (pThis = _pList, pTrail = NULL;
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pThis != this && pThis != NULL;
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pTrail = pThis, pThis = pThis->_pFwd)
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;
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if (pThis == NULL)
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return;
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if (pTrail == NULL)
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_pList = _pFwd;
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else
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pTrail->_pFwd = _pFwd;
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_cItems--;
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}
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void RESOURCE_CACHE::Promote()
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{
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RESOURCE_CACHE *pThis, *pTrail;
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for (pThis = _pList, pTrail = NULL;
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pThis != this && pThis != NULL;
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pTrail = pThis, pThis = pThis->_pFwd)
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;
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if (pThis == NULL) /* item not found??? */
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_cItems++; /* try to keep count accurate */
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else if (pTrail == NULL)
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return; /* already at list head, no change */
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else
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pTrail->_pFwd = _pFwd; /* remove item from list */
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_pFwd = _pList;
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_pList = this; /* make this the new list head */
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}
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const RESOURCE_CACHE *FindResourceCache( USHORT idMsg, RESOURCE_CACHE **ppLast,
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RESOURCE_CACHE **ppTrail )
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{
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RESOURCE_CACHE *pThis, *pTrail;
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if (RESOURCE_CACHE::_pList == NULL) { /* empty list? */
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*ppLast = NULL;
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*ppTrail = NULL;
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return NULL;
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}
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for (pThis = RESOURCE_CACHE::_pList;
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pThis->_pFwd != NULL && pThis->_idMsg != idMsg;
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pTrail = pThis, pThis = pThis->_pFwd)
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;
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if (pThis->_idMsg != idMsg) { /* item not found? */
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*ppLast = pThis; /* return ptr to last item */
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*ppTrail = pTrail; /* and to its predecessor */
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return NULL;
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}
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pThis->Promote(); /* item found, promote it */
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return pThis; /* and return it */
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}
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void AddResourceCache( USHORT idMsg, const NLS_STR *nls, RESOURCE_CACHE *pLast,
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RESOURCE_CACHE *pTrail )
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{
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if (RESOURCE_CACHE::_cItems < RESCACHE_MAX) { /* cache not full, make a new entry */
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RESOURCE_CACHE *pNew = new RESOURCE_CACHE( idMsg, *nls );
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/* automatically adds itself to the list */
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}
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else {
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if (pTrail != NULL) { /* if not already first item */
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pTrail->_pFwd = pLast->_pFwd; /* unlink from list */
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pLast->_pFwd = RESOURCE_CACHE::_pList; /* and move to front */
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RESOURCE_CACHE::_pList = pLast;
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}
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pLast->Set( idMsg, *nls ); /* set new contents */
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}
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}
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void RESOURCE_CACHE::Set( USHORT idMsg, const NLS_STR &nls )
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{
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*this = nls;
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_idMsg = idMsg;
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}
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#endif /* RESOURCE_STRING_CACHING */
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/*******************************************************************
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NAME: NLS_STR::LoadString
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SYNOPSIS: Loads a string from a resource file.
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ENTRY:
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EXIT: Returns an error value, which is WN_SUCCESS on success.
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NOTES: Requires that owner alloc strings must have an allocated
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size enough to fit strings of length MAX_RES_STR_LEN.
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This is requires even if the programmer thinks the string
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to be loaded is very small. The reason is that after the
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string has been localized, the string length bound is not
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known. Hence, the programmer always needs to allocate
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MAX_RES_STR_LEN + 1 bytes, which is guaranteed to be
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enough.
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HISTORY:
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rustanl 01/31/91 Created
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beng 07/23/91 Allow on erroneous string
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gregj 04/22/93 #ifdef'd out caching to save space
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********************************************************************/
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USHORT NLS_STR::LoadString( USHORT usMsgID )
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{
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if (QueryError())
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return (USHORT) QueryError();
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// Impose requirement on owner alloc'd strings (see function header).
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UIASSERT( !IsOwnerAlloc() ||
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( QueryAllocSize() >= MAX_RES_STR_LEN + 1 ));
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if ( ! IsOwnerAlloc())
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{
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// Resize the buffer to be big enough to hold any message.
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// If the buffer is already this big, realloc will do nothing.
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if ( ! realloc( MAX_RES_STR_LEN + 1 ))
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{
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return WN_OUT_OF_MEMORY;
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}
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}
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// At this point, we have a buffer which is big enough.
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UIASSERT( QueryAllocSize() >= MAX_RES_STR_LEN );
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#ifdef RESOURCE_STRING_CACHING
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RESOURCE_CACHE *pLast, *pTrail;
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const RESOURCE_CACHE *prc = FindResourceCache( usMsgID, &pLast, &pTrail );
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if (prc != NULL) {
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*this = *prc; /* copy contents */
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return WN_SUCCESS; /* all done */
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}
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#endif /* RESOURCE_STRING_CACHING */
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int cbCopied = MLLoadStringA(usMsgID, (LPSTR)QueryPch(),
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QueryAllocSize());
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if ( cbCopied == 0 )
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{
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return WN_BAD_VALUE;
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}
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_cchLen = cbCopied;
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IncVers();
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#ifdef RESOURCE_STRING_CACHING
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AddResourceCache( usMsgID, this, pLast, pTrail );
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#endif /* RESOURCE_STRING_CACHING */
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return WN_SUCCESS;
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}
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/*******************************************************************
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NAME: NLS_STR::LoadString
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SYNOPSIS: Loads a string from a resource file, and then inserts
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some parameters into it.
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ENTRY:
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EXIT: Returns an error value, which is WN_SUCCESS on success.
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NOTES: This method is provides a simple way to call the above
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LoadString and InsertParams consecutively.
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HISTORY:
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rustanl 01/31/91 Created
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********************************************************************/
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USHORT NLS_STR::LoadString( USHORT usMsgID,
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const NLS_STR * apnlsParamStrings[] )
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{
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USHORT usErr = LoadString( usMsgID );
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if ( usErr == WN_SUCCESS )
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{
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usErr = InsertParams( apnlsParamStrings );
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}
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return usErr;
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}
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#ifdef EXTENDED_STRINGS
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/*******************************************************************
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NAME: RESOURCE_STR::RESOURCE_STR
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SYNOPSIS: Constructs a nls-string from a resource ID.
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ENTRY: idResource
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EXIT: Successful construct, or else ReportError
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NOTES: This string may not be owner-alloc! For owner-alloc,
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cons up a new one and copy this into it.
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HISTORY:
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beng 07/23/91 Created
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********************************************************************/
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RESOURCE_STR::RESOURCE_STR( UINT idResource )
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: NLS_STR()
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{
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UIASSERT(!IsOwnerAlloc());
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USHORT usErr = LoadString(idResource);
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if (usErr)
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ReportError(usErr);
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}
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#endif
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