git.ozlabs.org Git - ccan/blob - ccan/tally/test/run-total.c

   1 #include <ccan/tally/tally.c>
   2 #include <ccan/tap/tap.h>
   3
   4 int main(void)
   5 {
   6         struct tally *tally;
   7         ssize_t total, overflow;
   8         ssize_t min, max;
   9
  10         max = (ssize_t)~(1ULL << (sizeof(max)*CHAR_BIT - 1));
  11         min = (ssize_t)(1ULL << (sizeof(max)*CHAR_BIT - 1));
  12
  13         plan_tests(15);
  14
  15         /* Simple case. */
  16         tally = tally_new(0);
  17         tally_add(tally, min);
  18         ok1(tally_total(tally, NULL) == min);
  19         ok1(tally_total(tally, &overflow) == min);
  20         ok1(overflow == -1);
  21
  22         /* Underflow. */
  23         tally_add(tally, min);
  24         total = tally_total(tally, &overflow);
  25         ok1(overflow == -1);
  26         ok1((size_t)total == 0);
  27         ok1(tally_total(tally, NULL) == min);
  28         free(tally);
  29
  30         /* Simple case. */
  31         tally = tally_new(0);
  32         tally_add(tally, max);
  33         ok1(tally_total(tally, NULL) == max);
  34         ok1(tally_total(tally, &overflow) == max);
  35         ok1(overflow == 0);
  36
  37         /* Overflow into sign bit... */
  38         tally_add(tally, max);
  39         total = tally_total(tally, &overflow);
  40         ok1(overflow == 0);
  41         ok1((size_t)total == (size_t)-2);
  42         ok1(tally_total(tally, NULL) == max);
  43
  44         /* Overflow into upper size_t. */
  45         tally_add(tally, max);
  46         total = tally_total(tally, &overflow);
  47         ok1(overflow == 1);
  48         if (sizeof(size_t) == 4)
  49                 ok1((size_t)total == 0x7FFFFFFD);
  50         else if (sizeof(size_t) == 8)
  51                 ok1((size_t)total == 0x7FFFFFFFFFFFFFFDULL);
  52         ok1(tally_total(tally, NULL) == max);
  53         free(tally);
  54
  55         return exit_status();
  56 }