kolibrios/programs/develop/open watcom/trunk/clib/heap/nheapwal.c

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/****************************************************************************
*
* Open Watcom Project
*
* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
* ========================================================================
*
* This file contains Original Code and/or Modifications of Original
* Code as defined in and that are subject to the Sybase Open Watcom
* Public License version 1.0 (the 'License'). You may not use this file
* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
* provided with the Original Code and Modifications, and is also
* available at www.sybase.com/developer/opensource.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
* NON-INFRINGEMENT. Please see the License for the specific language
* governing rights and limitations under the License.
*
* ========================================================================
*
* Description: WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
* DESCRIBE IT HERE!
*
****************************************************************************/
//#include "dll.h" // needs to be first
#include "variety.h"
#include <stddef.h>
#include <malloc.h>
#include "heap.h"
#include "heapacc.h"
#if defined(__SMALL_DATA__)
_WCRTLINK int _heapwalk( struct _heapinfo *entry )
{
return( _nheapwalk( entry ) );
}
#endif
int __NHeapWalk( struct _heapinfo *entry, mheapptr heapbeg )
{
frlptr p;
frlptr q;
if( heapbeg == NULL ) {
return( _HEAPEMPTY );
}
p = (frlptr)(entry->_pentry);
if( p == NULL ) {
p = (frlptr)(heapbeg + 1);
} else { /* advance to next entry */
for( heapbeg = __nheapbeg;; heapbeg = heapbeg->next ) {
if( heapbeg->next == NULL ) break;
if( (PTR)heapbeg <= (PTR)p &&
(PTR)heapbeg+heapbeg->len > (PTR)p ) break;
}
q = (frlptr)((PTR)p + (p->len & ~1));
if( q <= p ) {
return( _HEAPBADNODE );
}
p = q;
}
for( ;; ) {
if( p->len == END_TAG ) {
if( heapbeg->next == NULL ) {
entry->_useflag = _USEDENTRY;
entry->_size = 0;
entry->_pentry = NULL;
return( _HEAPEND );
} else { // We advance to next miniheapblk
heapbeg = heapbeg->next;
p = (frlptr)(heapbeg + 1);
}
} else {
break;
}
}
entry->_pentry = p;
entry->_useflag = _FREEENTRY;
entry->_size = p->len & ~1;
if( p->len & 1 ) {
entry->_useflag = _USEDENTRY;
}
return( _HEAPOK );
}
_WCRTLINK int _nheapwalk( struct _heapinfo *entry )
{
int heap_status;
_AccessNHeap();
heap_status = __NHeapWalk( entry, __nheapbeg );
_ReleaseNHeap();
return( heap_status );
}