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/*
* Motif
*
* Copyright (c) 1987-2012, The Open Group. All rights reserved.
*
* These libraries and programs are free software; you can
* redistribute them and/or modify them under the terms of the GNU
* Lesser General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* These libraries and programs are distributed in the hope that
* they will be useful, but WITHOUT ANY WARRANTY; without even the
* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with these librararies and programs; if not, write
* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
* Floor, Boston, MA 02110-1301 USA
*/
#ifdef REV_INFO
#ifndef lint
static char rcsid[] = "$XConsortium: Cache.c /main/12 1995/07/14 10:12:26 drk $"
#endif
#endif
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "CacheI.h"
#include <Xm/GadgetP.h>
/******** Static Function Declarations ********/
/******** End Static Function Declarations ********/
/************************************************************************
*
* _XmCacheDelete
* Delete an existing cache record. NOTE: <data> is a pointer to the
* fourth field in the cache record - It is *not* a pointer to the
* cache record itself!
*
************************************************************************/
void
_XmCacheDelete(
XtPointer data )
{
XmGadgetCachePtr ptr;
ptr = (XmGadgetCachePtr) DataToGadgetCache(data);
if (--ptr->ref_count <= 0) {
(ptr->prev)->next = ptr->next;
if (ptr->next) /* not the last record */
(ptr->next)->prev = ptr->prev;
XtFree( (char *) ptr );
}
}
/************************************************************************
*
* _XmCacheCopy
* Copy <size> bytes from <src> to <dest>.
*
************************************************************************/
void
_XmCacheCopy(
XtPointer src,
XtPointer dest,
size_t size )
{
memcpy( dest, src, size);
}
/************************************************************************
*
* _XmCachePart
* Pass in a pointer, <cpart>, to <size> bytes of a temporary Cache
* record.
* - If the Class cache head is NULL (no entries yet!), allocate a new
* cache record, copy in temporary Cache bytes, append it to the
* class-cache linked list, and return the address.
* - Else, run through the class linked list.
* = If a match is found, increment the ref_count and return the
* address.
* = Else, allocate a new cache record, copy in temporary Cache bytes,
* append it to the class-cache linked list, and return the address.
*
************************************************************************/
XtPointer
_XmCachePart(
XmCacheClassPartPtr cp,
XtPointer cpart,
size_t size )
{
XmGadgetCachePtr ptr, last;
if (ClassCacheHead(cp).next == NULL) /* First one */
{
ClassCacheHead(cp).next =
(struct _XmGadgetCache *)XtMalloc( size +
XtOffsetOf(XmGadgetCacheRef, data));
ptr = (XmGadgetCachePtr)ClassCacheHead(cp).next;
ClassCacheCopy(cp)(cpart, CacheDataPtr(ptr), size );
ptr-> ref_count = 1;
ptr-> next = NULL;
ptr-> prev = (struct _XmGadgetCache *)&ClassCacheHead(cp);
return (CacheDataPtr(ptr));
}
ptr = (XmGadgetCachePtr)ClassCacheHead(cp).next;
do
{
if ((ClassCacheCompare(cp)( cpart, CacheDataPtr(ptr))))
{
ptr->ref_count++;
return ((XtPointer) CacheDataPtr(ptr));
}
else
{
last = ptr;
ptr = (XmGadgetCachePtr)ptr->next;
}
} while (ptr);
/* Malloc a new rec off of last, fill it out*/
ptr = (XmGadgetCachePtr)XtMalloc( size +
XtOffsetOf(XmGadgetCacheRef, data) );
last->next = (struct _XmGadgetCache *)ptr;
ClassCacheCopy(cp)(cpart, CacheDataPtr(ptr), size);
ptr-> ref_count = 1;
ptr-> next = NULL;
ptr-> prev = last;
return (CacheDataPtr(ptr));
}
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