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#include "double_ended_queue.h"
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <stdio.h>
#define START_SIZE 64;
struct double_ended_queeu {
void **base, **end, **beg;
int i, limit;
};
deq* deq_new()
{
deq *root;
root = malloc(sizeof(deq));
assert(root);
root->limit = START_SIZE;
root->base = root->end = root->beg = malloc(root->limit * sizeof(void*));
assert(root->base);
return root;
}
deq* deq_with_capacity(n)
int n;
{
deq *root;
root = malloc(sizeof(deq));
assert(root);
root->limit = n;
root->base = root->end = root->beg = malloc(root->limit * sizeof(void*));
assert(root->base);
return root;
}
int deq_size(root)
deq *root;
{
if (!root) {
return -1;
}
return (root->end - root->beg);
}
void deq_resize(root)
deq *root;
{
if (root->beg != root->base) {
memmove(root->base, root->beg, root->end - root->beg);
root->end = root->base + deq_size(root);
root->beg = root->base;
} else {
root->base = malloc(root->limit * 2 * sizeof(void*));
assert(root->base);
root->base = memcpy(root->base, root->beg, root->limit * sizeof(void*));
assert(root->base);
root->end = root->base + deq_size(root);
root->limit = root->limit * 2;
free(root->beg);
root->beg = root->base;
}
}
void deq_push_back(root, item)
deq *root;
void *item;
{
if (!root) {
return;
}
if (root->end == root->base + root->limit) {
deq_resize(root);
}
*(root->end++) = item;
}
void* deq_pop_front(root)
deq *root;
{
void* tmp;
if (!root || root->beg == root->end) {
return NULL;
}
return tmp = *(root->beg++);
}
void* deq_index(root, index)
deq *root;
int index;
{
if (!root || root->beg + index >= root->end) {
return NULL;
}
return root->beg[index];
}
void* deq_pop_back(root)
deq *root;
{
void* tmp;
if (!root || root->end == root->beg) {
return NULL;
}
return tmp = *(--root->end);
}
void deq_free(root)
deq *root;
{
free(root->base);
root->base = NULL;
root->end = NULL;
root->beg = NULL;
free(root);
}
void deq_print(root)
deq *root;
{
void **tmp;
fprintf(stderr, "VEC[b: %p, p: %p, n:%p]:\n\t ",
root->base, root->beg, root->end);
for (tmp = root->beg; tmp < root->end; tmp++){
fprintf(stderr, "[%p]", *tmp);
}
fprintf(stderr, "\n");
}
deq* deq_cp(root)
deq *root;
{
deq *copy;
copy = deq_with_capacity(root->limit);
copy->base = memcpy(copy->base, root->beg,
deq_size(root) * sizeof(void*));
assert(copy->base);
copy->beg = copy->base;
copy->end = copy->base + deq_size(root);
}
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