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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.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef RTEMS_NEWLIB
#include "malloc_p.h"
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <rtems/score/sysstate.h>
#include <rtems/score/objectimpl.h>
void *realloc(
void *ptr,
size_t size
)
{
uintptr_t old_size;
char *new_area;
/*
* Do not attempt to allocate memory if in a critical section or ISR.
*/
if (_System_state_Is_up(_System_state_Get())) {
if (!_Thread_Dispatch_is_enabled())
return (void *) 0;
}
/*
* Continue with realloc().
*/
if ( !ptr )
return malloc( size );
if ( !size ) {
free( ptr );
return (void *) 0;
}
if ( !_Protected_heap_Get_block_size(RTEMS_Malloc_Heap, ptr, &old_size) ) {
errno = EINVAL;
return (void *) 0;
}
/*
* Now resize it.
*/
if ( _Protected_heap_Resize_block( RTEMS_Malloc_Heap, ptr, size ) ) {
return 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_area = malloc( size );
if ( !new_area ) {
return (void *) 0;
}
memcpy( new_area, ptr, (size < old_size) ? size : old_size );
free( ptr );
return new_area;
}
#endif
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