#include "FFlist.h"

#include <stdlib.h>
#include <string.h>

void* ffListAdd(FFlist* list)
{
    if(list->length == list->capacity)
    {
        list->capacity = list->capacity == 0 ? FF_LIST_DEFAULT_ALLOC : list->capacity * 2;
        // realloc(NULL, newSize) is same as malloc(newSize)
        list->data = realloc(list->data, (size_t)list->capacity * list->elementSize);
    }

    ++list->length;
    return ffListGet(list, list->length - 1);
}

bool ffListShift(FFlist* list, void* result)
{
    if(list->length == 0)
        return false;

    memcpy(result, list->data, list->elementSize);
    memmove(list->data, list->data + list->elementSize, (size_t) list->elementSize * (list->length - 1));
    --list->length;
    return true;
}

bool ffListPop(FFlist* list, void* result)
{
    if(list->length == 0)
        return false;

    memcpy(result, ffListGet(list, list->length - 1), list->elementSize);
    --list->length;
    return true;
}