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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "arraylist.h"
#define PUBLIC /* nothing */
#define PRIVATE static
// size doubles whenever it is exceeded
#define ARRAYLIST_DEFAULT_SIZE 4
//#define ARRAYLIST_DEBUG
struct array_list_type {
void* data; // the arraylist data
int element_size;
int max_num_elements;
int num_elements;
};
PRIVATE bool al_grow(Arraylist* al) {
void* result = realloc(
al->data,
al->max_num_elements * al->element_size * 2
);
if(result != NULL) {
al->data = result;
al->max_num_elements *= 2;
return true;
} else {
return false;
}
}
void al_delete_last(Arraylist *al) {
if(al->num_elements > 0)
al->num_elements -= 1;
}
bool al_delete_at(Arraylist *al, int position) {
if(position == (al->num_elements - 1)) {
al_delete_last(al);
return true;
}
else if((position >= 0) && (position < al->num_elements)) {
memcpy(
al->data + (position * al->element_size),
al->data + ((position + 1) * al->element_size),
al->element_size * (al->num_elements - position)
);
al->num_elements -= 1;
return true;
}
printf("Error: deletion out of bounds\n");
return false;
}
int al_len(Arraylist* al) {
return al->num_elements;
}
bool al_allocate_at_least(Arraylist* al, int size) {
if(al->max_num_elements >= size) return true;
void* result = realloc(
al->data,
size * al->element_size
);
if(result != NULL) {
al->data = result;
al->max_num_elements = size;
#ifdef ARRAYLIST_DEBUG
printf("Grew arraylist to %i\n", al->max_num_elements);
#endif
return true;
} else {
return false;
}
}
Arraylist* al_create(int type_size) {
Arraylist* al = malloc(sizeof(Arraylist));
al->data = malloc(sizeof(type_size) * ARRAYLIST_DEFAULT_SIZE);
al->element_size = type_size;
al->num_elements = 0;
al->max_num_elements = ARRAYLIST_DEFAULT_SIZE;
return al;
}
void al_free(Arraylist* al) {
free(al->data);
free(al);
}
bool al_push(Arraylist* al, void* item) {
if(al->num_elements >= al->max_num_elements) {
if(!al_grow(al)) {
printf("Error: Failed to grow arraylist to %i\n", al->max_num_elements);
return false;
}
#ifdef ARRAYLIST_DEBUG
printf("Grew arraylist to %i\n", al->max_num_elements);
#endif
}
memcpy(
al->data + (al->num_elements * al->element_size),
item,
al->element_size
);
al->num_elements += 1;
return true;
}
void* al_access(Arraylist* al, int position) {
if((position >= al->num_elements) || (position < 0))
return NULL;
return al->data + (al->element_size * position);
}
bool al_overwrite_and_delete(Arraylist* al, int source, int target) {
if(source == target) return true;
else if((source >= al->num_elements) || (target >= al->num_elements) || (source < 0) || (target < 0)) {
printf("Error, out of bounds");
return false;
}
memcpy(
al->data + (target * al->element_size),
al->data + (source * al->element_size),
al->element_size
);
return al_delete_at(al, source);
}
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