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Old 06-17-2008, 09:18 AM   #21 (permalink)
dcb
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Hmm, the malloc version returns 318, if I replace the memoryTest function with the following I get 381. I suspect the stack pointer version is not as future proof or accurate though. But it may still be useful enough. Your *10 malloc version also highlights the fact that the free memory may not be contiguous, since that returns only 170 bytes free when retrieved in 10 byte chunks.

Code:
extern int  __bss_end;
extern int  *__brkval;
int memoryTest(){
  int free_memory;
  if((int)__brkval == 0)
    free_memory = ((int)&free_memory) - ((int)&__bss_end);
  else
    free_memory = ((int)&free_memory) - ((int)__brkval);
  return free_memory;
}

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