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#include "array.h"
#include <stdlib.h>
#include <stdio.h>
#include "nstring.h"
void *_array_create_helper(size_t e_size)
{
_private_container *c = malloc(sizeof(_private_container) + e_size);
#ifdef DEBUGGING
c->_sentinel = SENTINEL;
#endif
c->_reserved = 1;
c->_size = 0;
return c->_array;
}
static void _array_resize_container(_private_container **c_, size_t e_size, int new_size)
{
assert( new_size >= 0 );
_private_container *c = *c_;
if (new_size > c->_reserved) {
/* increases the reserved space */
do
c->_reserved *= 2;
while (new_size < c->_reserved);
c = realloc(c, sizeof(_private_container) + e_size * c->_reserved);
}
c->_size = new_size;
*c_ = c;
}
void _array_resize_helper(void **a, size_t e_size, int new_size)
{
_private_container *c = _array_private_container(*a);
_array_resize_container(&c, e_size, new_size);
*a = c->_array;
}
void *_array_grow_helper(void **a, size_t e_size)
{
_private_container *c = _array_private_container(*a);
if (c->_size == c->_reserved) {
/* Array full, doubles the reserved memory */
c->_reserved *= 2;
c = realloc(c, sizeof(_private_container) + e_size * c->_reserved);
*a = c->_array;
}
return c->_array + (c->_size++) * e_size;
}
void _array_erase_helper(void **a, size_t e_size, void *first, void *last)
{
intptr_t diff = (char *)last - (char *)first;
/* copies the memory */
_private_container *c = _array_private_container(*a);
char *end = c->_array + c->_size * e_size;
memmove(first, last, end - (char *)last);
/* resizes the array */
assert("Invalid iterators passed to array erase" && (diff % e_size == 0));
c->_size -= diff / e_size;
}
void _array_shrink_helper(void **a, size_t e_size)
{
_private_container *c = _array_private_container(*a);
if (c->_size != 0) {
c = realloc(c, sizeof(_private_container) + e_size * c->_size);
c->_reserved = c->_size;
} else {
c = realloc(c, sizeof(_private_container) + e_size);
c->_reserved = 1;
}
*a = c->_array;
}
void _array_free_helper(void *a)
{
free(_array_private_container(a));
}
#if 0
int main() {
const int size = 100;
int i;
int *array = array_create(int);
/* pushes some elements */
for (i = 0; i < size; ++i)
array_push_back(&array, i);
assert(array_size(array) == size);
assert(array_size(array) <= array_reserved(array));
for (i = 0; i < size; ++i)
assert(array[i] == i);
/* erases second half */
array_erase(&array, array + size / 2, array + size);
assert(array_size(array) == size / 2);
assert(array_size(array) <= array_reserved(array));
for (i = 0; i < size / 2; ++i)
assert(array[i] == i);
/* shrinks */
array_shrink(&array);
assert(array_size(array) == array_reserved(array));
/* pushes back second half */
for (i = size / 2; i < size; ++i)
array_push_back(&array, i);
assert(array_size(array) == size);
assert(array_size(array) <= array_reserved(array));
for (i = 0; i < size; ++i)
assert(array[i] == i);
/* erases middle half */
array_erase(&array, array + size / 4, array + 3 * size / 4);
assert(array_size(array) == size / 2);
assert(array_size(array) <= array_reserved(array));
for (i = 0; i < size / 4; ++i)
assert(array[i] == i);
for (; i < size / 2; ++i)
assert(array[i] == i + size / 2);
/* shrinks */
array_shrink(&array);
assert(array_size(array) == array_reserved(array));
/* erases one element */
array_erase(&array, array, array + 1);
assert(array_size(array) == size / 2 - 1);
for (i = 1; i < size / 4; ++i)
assert(array[i - 1] == i);
for (; i < size / 2; ++i)
assert(array[i - 1] == i + size / 2);
/* erases no elements */
array_erase(&array, array, array);
array_erase(&array, array + array_size(array), array + array_size(array));
assert(array_size(array) == size / 2 - 1);
for (i = 1; i < size / 4; ++i)
assert(array[i - 1] == i);
for (; i < size / 2; ++i)
assert(array[i - 1] == i + size / 2);
/* erases all elements */
array_erase(&array, array, array + array_size(array));
assert(array_size(array) == 0);
/* shrinks */
array_shrink(&array);
assert(array_size(array) == 0);
assert(array_reserved(array) == 1);
return 0;
}
#endif
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