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/**
* @file
*
* @brief Reallocate Memory Block
* @ingroup libcsupport
*/
/*
* COPYRIGHT (c) 1989-2007.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef RTEMS_NEWLIB
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "malloc_p.h"
static void *new_alloc( void *old_ptr, size_t new_size, size_t old_size )
{
void *new_ptr;
/*
* There used to be a free on this error case but it is wrong to
* free the memory per OpenGroup Single UNIX Specification V2
* and the C Standard.
*/
new_ptr = malloc( new_size );
if ( new_ptr == NULL ) {
return NULL;
}
memcpy( new_ptr, old_ptr, ( new_size < old_size ) ? new_size : old_size );
free( old_ptr );
return new_ptr;
}
void *realloc( void *ptr, size_t size )
{
Heap_Control *heap;
Heap_Resize_status status;
uintptr_t old_size;
uintptr_t avail_size;
if ( ptr == NULL ) {
return malloc( size );
}
if ( size == 0 ) {
free( ptr );
return NULL;
}
heap = RTEMS_Malloc_Heap;
switch ( _Malloc_System_state() ) {
case MALLOC_SYSTEM_STATE_NORMAL:
_RTEMS_Lock_allocator();
_Malloc_Process_deferred_frees();
status = _Heap_Resize_block( heap, ptr, size, &old_size, &avail_size );
_RTEMS_Unlock_allocator();
break;
case MALLOC_SYSTEM_STATE_NO_PROTECTION:
status = _Heap_Resize_block( heap, ptr, size, &old_size, &avail_size );
break;
default:
return NULL;
}
switch ( status ) {
case HEAP_RESIZE_SUCCESSFUL:
return ptr;
case HEAP_RESIZE_UNSATISFIED:
return new_alloc( ptr, size, old_size );
default:
errno = EINVAL;
return NULL;
}
}
#endif
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