1 files changed, 119 insertions, 0 deletions
diff --git a/cpukit/score/src/heapresizeblock.c b/cpukit/score/src/heapresizeblock.c
new file mode 100644
index 0000000000..2d3528645f
--- /dev/null
+++ b/cpukit/score/src/heapresizeblock.c
@@ -0,0 +1,119 @@
+/**
+ * @file
+ *
+ * @ingroup ScoreHeap
+ *
+ * @brief Heap Handler implementation.
+ */
+
+/*
+ *  COPYRIGHT (c) 1989-1999.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  Copyright (c) 2009 embedded brains GmbH.
+ *
+ *  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
+
+#include <rtems/system.h>
+#include <rtems/score/sysstate.h>
+#include <rtems/score/heap.h>
+
+static Heap_Resize_status _Heap_Resize_block_checked(
+  Heap_Control *heap,
+  Heap_Block *block,
+  uintptr_t alloc_begin,
+  uintptr_t new_alloc_size,
+  uintptr_t *old_size,
+  uintptr_t *new_size
+)
+{
+  Heap_Statistics *const stats = &heap->stats;
+
+  uintptr_t const block_begin = (uintptr_t) block;
+  uintptr_t block_size = _Heap_Block_size( block );
+  uintptr_t block_end = block_begin + block_size;
+
+  uintptr_t alloc_size = block_end - alloc_begin + HEAP_ALLOC_BONUS;
+
+  Heap_Block *next_block = _Heap_Block_at( block, block_size );
+  uintptr_t next_block_size = _Heap_Block_size( next_block );
+  bool next_block_is_free = _Heap_Is_free( next_block );;
+
+  _HAssert( _Heap_Is_block_in_heap( heap, next_block ) );
+  _HAssert( _Heap_Is_prev_used( next_block ) );
+
+  *old_size = alloc_size;
+
+  if ( next_block_is_free ) {
+    block_size += next_block_size;
+    alloc_size += next_block_size;
+  }
+
+  if ( new_alloc_size > alloc_size ) {
+    return HEAP_RESIZE_UNSATISFIED;
+  }
+
+  if ( next_block_is_free ) {
+    _Heap_Block_set_size( block, block_size );
+
+    _Heap_Free_list_remove( next_block );
+
+    next_block = _Heap_Block_at( block, block_size );
+    next_block->size_and_flag |= HEAP_PREV_BLOCK_USED;
+
+    /* Statistics */
+    --stats->free_blocks;
+    stats->free_size -= next_block_size;
+  }
+
+  block = _Heap_Block_allocate( heap, block, alloc_begin, new_alloc_size );
+
+  block_size = _Heap_Block_size( block );
+  next_block = _Heap_Block_at( block, block_size );
+  *new_size = (uintptr_t) next_block - alloc_begin + HEAP_ALLOC_BONUS;
+
+  /* Statistics */
+  ++stats->resizes;
+
+  return HEAP_RESIZE_SUCCESSFUL;
+}
+
+Heap_Resize_status _Heap_Resize_block(
+  Heap_Control *heap,
+  void *alloc_begin_ptr,
+  uintptr_t new_alloc_size,
+  uintptr_t *old_size,
+  uintptr_t *new_size
+)
+{
+  uintptr_t const page_size = heap->page_size;
+
+  uintptr_t const alloc_begin = (uintptr_t) alloc_begin_ptr;
+
+  Heap_Block *const block = _Heap_Block_of_alloc_area( alloc_begin, page_size );
+
+  *old_size = 0;
+  *new_size = 0;
+
+  if ( _Heap_Is_block_in_heap( heap, block ) ) {
+    _Heap_Protection_block_check( heap, block );
+    return _Heap_Resize_block_checked(
+      heap,
+      block,
+      alloc_begin,
+      new_alloc_size,
+      old_size,
+      new_size
+    );
+  }
+  return HEAP_RESIZE_FATAL_ERROR;
+}