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#include "array.h"
#include <stdlib.h>
#include <string.h>
#define ARRAY_GROWTH_FACTOR 2
#define MAX(x, y) ( (x > y) ? x : y )
typedef struct _RealArray
{
char *data;
unsigned int length; /* Number of elements */
unsigned int type_size;
unsigned int capacity; /* Array capacity in elements number */
bool clear;
} RealArray;
static void array_check_for_expand(RealArray *arr, unsigned int length);
Array *array_create(unsigned int type_size)
{
return array_create_by_size(type_size, 0);
}
Array *array_create_by_size(unsigned int type_size, unsigned int reserved_size)
{
RealArray *arr = malloc( sizeof(RealArray) );
arr->capacity = 0;
arr->data = NULL;
arr->length = 0;
arr->type_size = type_size;
if(reserved_size != 0)
{
array_check_for_expand(arr, reserved_size);
}
return (Array *)arr;
}
void array_append(Array *arr, void *data)
{
RealArray *r_arr = (RealArray *)arr;
array_check_for_expand(r_arr, 1);
memcpy(r_arr->data + r_arr->length * r_arr->type_size, data, r_arr->type_size);
r_arr->length += 1;
}
void array_insert(Array *arr, int index, void *data)
{
RealArray *r_arr = (RealArray *)arr;
array_check_for_expand(r_arr, 1);
/* Shift everything one place */
memmove(r_arr->data + (index + 1) * r_arr->type_size,
r_arr->data + index * r_arr->type_size,
r_arr->length * r_arr->type_size - index * r_arr->type_size);
/* Insert the new data */
memcpy(r_arr->data + index * r_arr->type_size, data, r_arr->type_size);
r_arr->length += 1;
}
void array_remove(Array *arr, int index)
{
}
void array_reserve(Array *arr, unsigned int length)
{
}
unsigned int array_get_type_size(Array *arr)
{
RealArray *r_arr = (RealArray *)arr;
return r_arr->type_size;
}
void array_free(Array *arr)
{
RealArray *r_arr = (RealArray *)arr;
free(r_arr->data);
free(r_arr);
}
static void array_check_for_expand(RealArray *arr, unsigned int length)
{
RealArray *r_arr = (RealArray *)arr;
unsigned int expected_size = r_arr->length + length;
if(r_arr->capacity < expected_size)
{
r_arr->capacity = MAX(ARRAY_GROWTH_FACTOR * r_arr->capacity, expected_size);
r_arr->data = realloc(r_arr->data, r_arr->capacity * r_arr->type_size);
}
}
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