1 /*
2  * FreeRTOS Kernel V11.1.0
3  * Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
4  *
5  * SPDX-License-Identifier: MIT
6  *
7  * Permission is hereby granted, free of charge, to any person obtaining a copy of
8  * this software and associated documentation files (the "Software"), to deal in
9  * the Software without restriction, including without limitation the rights to
10  * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
11  * the Software, and to permit persons to whom the Software is furnished to do so,
12  * subject to the following conditions:
13  *
14  * The above copyright notice and this permission notice shall be included in all
15  * copies or substantial portions of the Software.
16  *
17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
19  * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
20  * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
21  * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23  *
24  * https://www.FreeRTOS.org
25  * https://github.com/FreeRTOS
26  *
27  */
28 
29 /* THIS SAMPLE CODE IS PROVIDED AS IS AND IS SUBJECT TO ALTERATIONS. FUJITSU */
30 /* MICROELECTRONICS ACCEPTS NO RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR */
31 /* ELIGIBILITY FOR ANY PURPOSES.                                             */
32 /*                 (C) Fujitsu Microelectronics Europe GmbH                  */
33 /*---------------------------------------------------------------------------
34   __STD_LIB_sbrk.C
35   - Used by heap_3.c for memory allocation and deletion.
36 
37 /*---------------------------------------------------------------------------*/
38 
39 #include "FreeRTOSConfig.h"
40 #include <stdlib.h>
41 
42     static  long         brk_siz  =  0;
43     typedef int          _heep_t;
44     #define ROUNDUP(s)   (((s)+sizeof(_heep_t)-1)&~(sizeof(_heep_t)-1))
45     static  _heep_t      _heep[ROUNDUP(configTOTAL_HEAP_SIZE)/sizeof(_heep_t)];
46     #define              _heep_size      ROUNDUP(configTOTAL_HEAP_SIZE)
47 
sbrk(int size)48     extern  char  *sbrk(int  size)
49     {
50        if  (brk_siz  +  size  >  _heep_size  ||  brk_siz  +  size  <  0)
51 
52           return((char*)-1);
53        brk_siz  +=  size;
54        return(  (char*)_heep  +  brk_siz  -  size);
55     }
56