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/*
* BIRD Library -- Universal Heap Macros Tests
*
* (c) 2015 CZ.NIC z.s.p.o.
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include "test/birdtest.h"
#include "sysdep/config.h"
#include "lib/heap.h"
#define MAX_NUM 1000
#define SPECIAL_KEY -3213
#define MY_CMP(x, y) ((x) < (y))
#define MY_HEAP_SWAP(heap,a,b,t) \
do { \
bt_debug("swap(%u %u) ", a, b); \
HEAP_SWAP(heap,a,b,t); \
} while(0)
static int heap[MAX_NUM+1];
static uint num;
/*
* A valid heap must follow these rules:
* - `num >= 0`
* - `heap[i] >= heap[i / 2]` for each `i` in `[2, num]`
*/
static int
is_heap_valid(int heap[], uint num)
{
uint i;
if (num > MAX_NUM)
return 0;
for (i = 2; i <= num; i++)
if (heap[i] < heap[i / 2])
return 0;
return 1;
}
static void
show_heap(void)
{
uint i;
bt_debug("\n");
bt_debug("numbers %u; ", num);
for (i = 0; i <= num; i++)
bt_debug("%d ", heap[i]);
bt_debug(is_heap_valid(heap, num) ? "OK" : "NON-VALID HEAP!");
bt_debug("\n");
}
static void
init_heap(void)
{
uint i;
num = 0;
heap[0] = SPECIAL_KEY; /* heap[0] should be unused */
for (i = 1; i <= MAX_NUM; i++)
heap[i] = 0;
}
static int
t_heap_insert(void)
{
uint i;
init_heap();
for (i = MAX_NUM; i >= 1; i--)
{
bt_debug("ins %u at pos %u ", i, MAX_NUM - i);
heap[MAX_NUM - i + 1] = i;
HEAP_INSERT(heap, ++num, int, MY_CMP, MY_HEAP_SWAP);
show_heap();
bt_assert(is_heap_valid(heap, num));
}
return 1;
}
static int
t_heap_increase_decrease(void)
{
uint i;
t_heap_insert();
for (i = 1; i <= MAX_NUM; i++)
{
if ((int)i > heap[i])
{
bt_debug("inc %u ", i);
heap[i] = i;
HEAP_INCREASE(heap, num, int, MY_CMP, MY_HEAP_SWAP, i);
}
else if ((int)i < heap[i])
{
bt_debug("dec %u ", i);
heap[i] = i;
HEAP_INCREASE(heap, num, int, MY_CMP, MY_HEAP_SWAP, i);
}
show_heap();
bt_assert(is_heap_valid(heap, num));
}
return 1;
}
static int
t_heap_delete(void)
{
uint i;
t_heap_insert();
for (i = 1; i <= num; i++)
{
bt_debug("del at pos %u ", i);
HEAP_DELETE(heap, num, int, MY_CMP, MY_HEAP_SWAP, i);
show_heap();
bt_assert(is_heap_valid(heap, num));
}
return 1;
}
static int
t_heap_0(void)
{
init_heap();
t_heap_insert();
t_heap_increase_decrease();
t_heap_delete();
return heap[0] == SPECIAL_KEY;
}
static int
t_heap_insert_random(void)
{
int i, j;
int expected[MAX_NUM+1];
init_heap();
for (i = 1; i <= MAX_NUM; i++)
{
heap[i] = expected[i] = bt_random();
HEAP_INSERT(heap, ++num, int, MY_CMP, MY_HEAP_SWAP);
show_heap();
bt_assert(is_heap_valid(heap, num));
}
for (i = 1; i <= MAX_NUM; i++)
for (j = 1; j <= MAX_NUM; j++)
if(expected[i] == heap[j])
break;
else if (j == MAX_NUM)
{
show_heap();
bt_abort_msg("Did not find a number %d in heap.", expected[i]);
}
return 1;
}
int
main(int argc, char *argv[])
{
bt_init(argc, argv);
bt_test_suite(t_heap_insert, "Inserting a descending sequence of numbers (the worst case)");
bt_test_suite(t_heap_insert_random, "Inserting pseudo-random numbers");
bt_test_suite(t_heap_increase_decrease, "Increasing/Decreasing");
bt_test_suite(t_heap_delete, "Deleting");
bt_test_suite(t_heap_0, "Is a heap[0] really unused?");
return bt_exit_value();
}
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