89 lines
3.1 KiB
C
89 lines
3.1 KiB
C
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/****************************************************************************
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*
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* Open Watcom Project
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*
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* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*
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* ========================================================================
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*
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* This file contains Original Code and/or Modifications of Original
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* Code as defined in and that are subject to the Sybase Open Watcom
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* Public License version 1.0 (the 'License'). You may not use this file
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* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
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* provided with the Original Code and Modifications, and is also
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* available at www.sybase.com/developer/opensource.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
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* NON-INFRINGEMENT. Please see the License for the specific language
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* governing rights and limitations under the License.
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*
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* ========================================================================
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*
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* Description: Near heap realloc routines.
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*
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****************************************************************************/
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//#include "dll.h" // needs to be first
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#include "variety.h"
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#include <stddef.h>
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#include <malloc.h>
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#include <string.h>
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#include "heap.h"
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#if defined(__DOS_EXT__)
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#include "extender.h"
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#endif
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#if defined(__SMALL_DATA__)
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_WCRTLINK void *realloc( void *stg, size_t amount )
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{
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return( _nrealloc( stg, amount ) );
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}
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#endif
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#pragma intrinsic(memcpy)
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_WCRTLINK void _WCNEAR *_nrealloc( void _WCI86NEAR *stg, size_t req_size )
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{
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void _WCNEAR *p;
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size_t old_size;
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if( stg == NULL ) {
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return( _nmalloc( req_size ) );
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}
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if( req_size == 0 ) {
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_nfree( stg );
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return( (void _WCNEAR *) NULL );
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}
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old_size = _nmsize( stg );
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p = _nexpand( stg, req_size ); /* try to expand it in place */
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if( p == NULL ) { /* if couldn't be expanded in place */
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#if defined(__DOS_EXT__)
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if( _IsRational() ) {
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frlptr flp, newflp;
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flp = (frlptr) ((PTR)stg - TAG_SIZE);
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newflp = __ReAllocDPMIBlock( flp, req_size + TAG_SIZE );
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if( newflp ) {
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return( (void _WCNEAR *)((PTR)newflp + TAG_SIZE) );
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}
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}
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#endif
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p = _nmalloc( req_size ); /* - allocate a new block */
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if( p != NULL ) { /* - if we got one */
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memcpy( p, stg, old_size ); /* copy it */
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_nfree( stg ); /* and free old one */
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} else {
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_nexpand( stg, old_size ); /* reset back to old size */
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}
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}
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return( p );
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}
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