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#include <_ansi.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "sys/syscall.h"
#include <stdlib.h>
extern int _write (int, char *, int);
caddr_t
_sbrk (int incr)
{
extern char heap_start[]; /* Defined by the linker script. */
static char * heap_end = NULL;
char * prev_heap_end;
char * sp = (char *) & sp;
if (heap_end == NULL)
heap_end = heap_start;
prev_heap_end = heap_end;
if (heap_end + incr > sp)
{
#define MESSAGE "Heap and stack collision\n"
_write (1, MESSAGE, sizeof MESSAGE);
abort ();
}
heap_end += incr;
return (caddr_t) prev_heap_end;
}
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