/** @file
    Generic list.

    Copyright (C) 2018 Christian Zuckschwerdt

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
*/

#include "list.h"
#include "fatal.h"
#include <stdlib.h>
#include <stdio.h>

void list_ensure_size(list_t *list, size_t min_size)
{
    if (!list->elems || list->size < min_size) {
        // the input pointer is still valid if reallocation fails
        void *elems_realloc = realloc(list->elems, min_size * sizeof(*list->elems));
        if (!elems_realloc) {
            FATAL_REALLOC("list_ensure_size()");
        }
        list->elems = elems_realloc;
        list->size  = min_size;

        list->elems[list->len] = NULL; // ensure a terminating NULL
    }
}

void list_push(list_t *list, void *p)
{
    if (list->len + 1 >= list->size) // account for terminating NULL
        list_ensure_size(list, list->size < 8 ? 8 : list->size + list->size / 2);

    list->elems[list->len++] = p;

    list->elems[list->len] = NULL; // ensure a terminating NULL
}

void list_push_all(list_t *list, void **p)
{
    for (void **iter = p; iter && *iter; ++iter)
        list_push(list, *iter);
}

void list_remove(list_t *list, size_t idx, list_elem_free_fn elem_free)
{
    if (idx >= list->len) {
        return; // report error?
    }
    if (elem_free) {
        elem_free(list->elems[idx]);
    }
    for (size_t i = idx; i < list->len; ++i) { // list might contain NULLs
        list->elems[i] = list->elems[i + 1]; // ensures a terminating NULL
    }
    list->len--;
}

void list_clear(list_t *list, list_elem_free_fn elem_free)
{
    if (elem_free) {
        for (size_t i = 0; i < list->len; ++i) { // list might contain NULLs
            elem_free(list->elems[i]);
        }
    }
    list->len = 0;
    if (list->elems) {
        list->elems[0] = NULL; // ensure a terminating NULL
    }
}

void list_free_elems(list_t *list, list_elem_free_fn elem_free)
{
    list_clear(list, elem_free);
    free(list->elems);
    list->elems = NULL;
    list->size  = 0;
}
