Minix1.5/test/test6.c

/* test 6 */

#define MAX_ERROR 4

extern char *brk(), *sbrk();
extern int errno;

int errct;
int subtest = 1;

main()
{
  int i;

  printf("Test  6 ");
  for (i = 0; i < 70; i++) {
	test60();
  }
  if (errct == 0)
	printf("ok\n");
  else
	printf(" %d errors\n", errct);
  exit(0);
}



test60()
{
/* Test sbrk() and brk(). */

  char *addr, *addr2, *addr3;
  int i, del, click, click2;

  addr = sbrk(0);
  addr = sbrk(0);		/* force break to a click boundary */
  for (i = 0; i < 10; i++) sbrk(7 * i);
  for (i = 0; i < 10; i++) sbrk(-7 * i);
  if (sbrk(0) != addr) e(1);
  sbrk(30);
  if (brk(addr) != 0) e(2);
  if (sbrk(0) != addr) e(3);

  del = 0;
  do {
	del++;
	brk(addr + del);
	addr2 = sbrk(0);
  } while (addr2 == addr);
  click = addr2 - addr;
  sbrk(-1);
  if (sbrk(0) != addr) e(4);
  brk(addr);
  if (sbrk(0) != addr) e(5);

  del = 0;
  do {
	del++;
	brk(addr - del);
	addr3 = sbrk(0);
  } while (addr3 == addr);
  click2 = addr - addr3;
  sbrk(1);
  if (sbrk(0) != addr) e(6);
  brk(addr);
  if (sbrk(0) != addr) e(8);
  if (click != click2) e(9);

  brk(addr + 2 * click);
  if (sbrk(0) != addr + 2 * click) e(10);
  sbrk(3 * click);
  if (sbrk(0) != addr + 5 * click) e(11);
  sbrk(-5 * click);
  if (sbrk(0) != addr) e(12);
}


e(n)
int n;
{
  int err_num = errno;		/* save errno in case printf clobbers it */

  printf("Subtest %d,  error %d  errno=%d  ", subtest, n, errno);
  errno = err_num;		/* restore errno, just in case */
  perror("");
  if (errct++ > MAX_ERROR) {
	printf("Too many errors; test aborted\n");
	exit(1);
  }
}