32 lines
444 B
C
32 lines
444 B
C
|
/* $Source$
|
||
|
|
* $State$
|
||
|
|
* $Revision$
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include "libsys.h"
|
||
|
|
|
||
|
|
#define OUT_OF_MEMORY (void*)(-1) /* sbrk returns this on failure */
|
||
|
|
|
||
|
|
extern char _end[1];
|
||
|
|
|
||
|
|
static char* current = _end;
|
||
|
|
|
||
|
|
void* sbrk(intptr_t increment)
|
||
|
|
{
|
||
|
|
char* old;
|
||
|
|
char* new;
|
||
|
|
|
||
|
|
if (increment == 0)
|
||
|
|
return current;
|
||
|
|
|
||
|
|
old = current;
|
||
|
|
new = old + increment;
|
||
|
|
if (brk(new) < 0)
|
||
|
|
return OUT_OF_MEMORY;
|
||
|
|
|
||
|
|
current = new;
|
||
|
|
return old;
|
||
|
|
}
|