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#include "vector.h"
#include <stdio.h>
#include <stdlib.h>
struct vector *vector_init(size_t n)
{
struct vector *res = malloc(sizeof(struct vector));
if (res == NULL)
{
return NULL;
}
res->size = 0;
res->capacity = n;
res->data = malloc(n * sizeof(int));
if (res->data == NULL)
{
return NULL;
}
return res;
}
void vector_destroy(struct vector *v)
{
if (v)
{
free(v->data);
free(v);
}
}
struct vector *vector_resize(struct vector *v, size_t n)
{
if (!v)
{
return NULL;
}
if (n == v->capacity)
{
return v;
}
if (v)
{
int *tmp = realloc(v->data, n * sizeof(int));
if (tmp == NULL)
{
return NULL;
}
v->data = tmp;
if (n < v->size)
{
v->size = n;
}
v->capacity = n;
return v;
}
return NULL;
}
struct vector *vector_append(struct vector *v, int elt)
{
if (v == NULL)
{
return NULL;
}
if (v->size == v->capacity)
{
if (vector_resize(v, v->capacity * 2) == NULL)
{
return NULL;
}
}
v->data[v->size] = elt;
v->size++;
return v;
}
void vector_print(const struct vector *v)
{
if (v == NULL || v->size == 0)
{
printf("\n");
return;
}
for (size_t i = 0; i < v->size - 1; i++)
{
printf("%d,", v->data[i]);
}
printf("%d\n", v->data[v->size - 1]);
}
struct vector *vector_reset(struct vector *v, size_t n)
{
if (vector_resize(v, n) == NULL)
{
return NULL;
}
v->size = 0;
return v;
}
struct vector *vector_insert(struct vector *v, size_t i, int elt)
{
if (v == NULL || i > v->size)
return NULL;
if (i == v->size)
{
return vector_append(v, elt);
}
if (v->size == v->capacity)
{
if (vector_resize(v, v->capacity * 2) == NULL)
{
return NULL;
}
}
for (size_t j = v->size; j > i; j--)
{
v->data[j] = v->data[j - 1];
}
v->size++;
v->data[i] = elt;
return v;
}
struct vector *vector_remove(struct vector *v, size_t i)
{
if (v == NULL || v->size == 0 || i >= v->size)
{
return NULL;
}
for (size_t j = i; j < v->size - 1; j++)
{
v->data[j] = v->data[j + 1];
}
v->size--;
if (v->size < v->capacity / 2)
{
if (vector_resize(v, v->capacity / 2) == NULL)
{
return NULL;
}
}
return v;
}
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