source: rtems/cpukit/libcsupport/src/realloc.c @ cc390b62

4.115
Last change on this file since cc390b62 was cc390b62, checked in by Alex Ivanov <alexivanov97@…>, on 12/11/12 at 22:35:30

libcsupport: Doxygen enhancement GCI task #6

http://www.google-melange.com/gci/task/view/google/gci2012/7992212

  • Property mode set to 100644
File size: 1.6 KB
Line 
1/**
2 *  @file
3 *
4 *  @brief Reallocate Memory Block
5 *  @ingroup libcsupport
6 */
7
8/*
9 *  COPYRIGHT (c) 1989-2007.
10 *  On-Line Applications Research Corporation (OAR).
11 *
12 *  The license and distribution terms for this file may be
13 *  found in the file LICENSE in this distribution or at
14 *  http://www.rtems.com/license/LICENSE.
15 */
16
17#if HAVE_CONFIG_H
18#include "config.h"
19#endif
20
21#ifdef RTEMS_NEWLIB
22#include "malloc_p.h"
23#include <stdlib.h>
24#include <errno.h>
25
26void *realloc(
27  void *ptr,
28  size_t size
29)
30{
31  uintptr_t old_size;
32  char    *new_area;
33
34  MSBUMP(realloc_calls, 1);
35
36  /*
37   *  Do not attempt to allocate memory if in a critical section or ISR.
38   */
39
40  if (_System_state_Is_up(_System_state_Get())) {
41    if (_Thread_Dispatch_in_critical_section())
42      return (void *) 0;
43
44    if (_ISR_Nest_level > 0)
45      return (void *) 0;
46  }
47
48  /*
49   * Continue with realloc().
50   */
51  if ( !ptr )
52    return malloc( size );
53
54  if ( !size ) {
55    free( ptr );
56    return (void *) 0;
57  }
58
59  if ( !_Protected_heap_Get_block_size(RTEMS_Malloc_Heap, ptr, &old_size) ) {
60    errno = EINVAL;
61    return (void *) 0;
62  }
63
64  /*
65   *  Now resize it.
66   */
67  if ( _Protected_heap_Resize_block( RTEMS_Malloc_Heap, ptr, size ) ) {
68    return ptr;
69  }
70
71  /*
72   *  There used to be a free on this error case but it is wrong to
73   *  free the memory per OpenGroup Single UNIX Specification V2
74   *  and the C Standard.
75   */
76
77  new_area = malloc( size );
78
79  MSBUMP(malloc_calls, (uint32_t) -1);   /* subtract off the malloc */
80
81  if ( !new_area ) {
82    return (void *) 0;
83  }
84
85  memcpy( new_area, ptr, (size < old_size) ? size : old_size );
86  free( ptr );
87
88  return new_area;
89
90}
91#endif
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