as-list/country-list: Set elements list to zero after freeing it

[location/libloc.git] / src / country-list.c

/*
	libloc - A library to determine the location of someone on the Internet

	Copyright (C) 2020 IPFire Development Team <info@ipfire.org>

	This library is free software; you can redistribute it and/or
	modify it under the terms of the GNU Lesser General Public
	License as published by the Free Software Foundation; either
	version 2.1 of the License, or (at your option) any later version.

	This library is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
	Lesser General Public License for more details.
*/

#include <errno.h>
#include <stdlib.h>

#include <loc/country.h>
#include <loc/country-list.h>
#include <loc/private.h>

struct loc_country_list {
	struct loc_ctx* ctx;
	int refcount;

	struct loc_country** elements;
	size_t elements_size;

	size_t size;
};

static int loc_country_list_grow(struct loc_country_list* list, size_t size) {
	DEBUG(list->ctx, "Growing country list %p by %zu to %zu\n",
		list, size, list->elements_size + size);

	struct loc_country** elements = reallocarray(list->elements,
			list->elements_size + size, sizeof(*list->elements));
	if (!elements)
		return -errno;

	list->elements = elements;
	list->elements_size += size;

	return 0;
}

LOC_EXPORT int loc_country_list_new(struct loc_ctx* ctx,
		struct loc_country_list** list) {
	struct loc_country_list* l = calloc(1, sizeof(*l));
	if (!l)
		return -ENOMEM;

	l->ctx = loc_ref(ctx);
	l->refcount = 1;

	DEBUG(l->ctx, "Country list allocated at %p\n", l);
	*list = l;

	return 0;
}

LOC_EXPORT struct loc_country_list* loc_country_list_ref(struct loc_country_list* list) {
	list->refcount++;

	return list;
}

static void loc_country_list_free(struct loc_country_list* list) {
	DEBUG(list->ctx, "Releasing country list at %p\n", list);

	loc_country_list_clear(list);

	loc_unref(list->ctx);
	free(list);
}

LOC_EXPORT struct loc_country_list* loc_country_list_unref(struct loc_country_list* list) {
	if (!list)
		return NULL;

	if (--list->refcount > 0)
		return list;

	loc_country_list_free(list);
	return NULL;
}

LOC_EXPORT size_t loc_country_list_size(struct loc_country_list* list) {
	return list->size;
}

LOC_EXPORT int loc_country_list_empty(struct loc_country_list* list) {
	return list->size == 0;
}

LOC_EXPORT void loc_country_list_clear(struct loc_country_list* list) {
	if (!list->elements)
		return;

	for (unsigned int i = 0; i < list->size; i++)
		loc_country_unref(list->elements[i]);

	free(list->elements);
	list->elements = NULL;
	list->elements_size = 0;

	list->size = 0;
}

LOC_EXPORT struct loc_country* loc_country_list_get(struct loc_country_list* list, size_t index) {
	// Check index
	if (index >= list->size)
		return NULL;

	return loc_country_ref(list->elements[index]);
}

LOC_EXPORT int loc_country_list_append(
		struct loc_country_list* list, struct loc_country* country) {
	if (loc_country_list_contains(list, country))
		return 0;

	// Check if we have space left
	if (list->size >= list->elements_size) {
		int r = loc_country_list_grow(list, 64);
		if (r)
			return r;
	}

	DEBUG(list->ctx, "%p: Appending country %p to list\n", list, country);

	list->elements[list->size++] = loc_country_ref(country);

	return 0;
}

LOC_EXPORT int loc_country_list_contains(
		struct loc_country_list* list, struct loc_country* country) {
	for (unsigned int i = 0; i < list->size; i++) {
		if (loc_country_cmp(country, list->elements[i]) == 0)
			return 1;
	}

	return 0;
}

LOC_EXPORT int loc_country_list_contains_code(
		struct loc_country_list* list, const char* code) {
	struct loc_country* country;

	int r = loc_country_new(list->ctx, &country, code);
	if (r)
		return -1;

	r = loc_country_list_contains(list, country);
	loc_country_unref(country);

	return r;
}