__std_lib_sbrk.c

来自「FreeRTOS is a portable, open source, min」· C语言 代码 · 共 29 行

/* THIS SAMPLE CODE IS PROVIDED AS IS AND IS SUBJECT TO ALTERATIONS. FUJITSU */
/* MICROELECTRONICS ACCEPTS NO RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR */
/* ELIGIBILITY FOR ANY PURPOSES.                                             */
/*                 (C) Fujitsu Microelectronics Europe GmbH                  */
/*---------------------------------------------------------------------------
  __STD_LIB_sbrk.C
  - Used by heap_3.c for memory accocation and deletion.

/*---------------------------------------------------------------------------*/

#include "FreeRTOSConfig.h"
#include <stdlib.h>

	static  long         brk_siz  =  0;
	typedef int          _heep_t;
	#define ROUNDUP(s)   (((s)+sizeof(_heep_t)-1)&~(sizeof(_heep_t)-1))
	static  _heep_t      _heep[ROUNDUP(configTOTAL_HEAP_SIZE)/sizeof(_heep_t)];
	#define              _heep_size      ROUNDUP(configTOTAL_HEAP_SIZE)

	extern  char  *sbrk(int  size)
	{
	   if  (brk_siz  +  size  >  _heep_size  ||  brk_siz  +  size  <  0)

          return((char*)-1);
	   brk_siz  +=  size;
	   return(  (char*)_heep  +  brk_siz  -  size);
	}