/*
 * fake sbrk implementation by RL @ Aetey Global Technologies AB
 * 2016-04-13
 * put in public domain by the author
 */

#include <errno.h>
#include <sys/types.h>

/* preallocate 10 Mbyte */
#define POOLSIZE 10485760

static char brkspace[POOLSIZE];
static int  brki = 0;

void *sbrk(intptr_t incr) {
  int prev;
/* do not mind leaking memory on negative incr,
 * ex does not seem to use this */
  if (incr <= 0)
    return (void *)(brkspace+brki);
  if (incr > POOLSIZE-brki) {
    errno = ENOMEM;
    return (void *)-1;
  }
  prev = brki;
  brki += incr;
  return (void *)(brkspace+prev);
}