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/*
* calloc()
*
* 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.com/license/LICENSE.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef RTEMS_NEWLIB
#include "malloc_p.h"
#include <stdlib.h>
#include <errno.h>
void *realloc(
void *ptr,
size_t size
)
{
intptr_t old_size;
char *new_area;
intptr_t resize;
MSBUMP(realloc_calls, 1);
/*
* Do not attempt to allocate memory if in a critical section or ISR.
*/
if (_System_state_Is_up(_System_state_Get())) {
if (_Thread_Dispatch_disable_level > 0)
return (void *) 0;
if (_ISR_Nest_level > 0)
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;
}
/*
* If block boundary integrity checking is enabled, then
* we need to account for the boundary memory again.
*/
resize = size;
#if defined(RTEMS_MALLOC_BOUNDARY_HELPERS)
if (rtems_malloc_boundary_helpers)
resize += (*rtems_malloc_boundary_helpers->overhead)();
#endif
if ( _Protected_heap_Resize_block( RTEMS_Malloc_Heap, ptr, resize ) ) {
#if defined(RTEMS_MALLOC_BOUNDARY_HELPERS)
/*
* Successful resize. Update the boundary on the same block.
*/
if (rtems_malloc_boundary_helpers)
(*rtems_malloc_boundary_helpers->at_realloc)(ptr, resize);
#endif
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 );
MSBUMP(malloc_calls, -1); /* subtract off the malloc */
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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