label.c

/*
 * This file is a part of plotnetcfg, a tool to visualize network config.
 * Copyright (C) 2014 Red Hat, Inc. -- Jiri Benc <jbenc@redhat.com>
 *
 * 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.
 *
 * This program 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 General Public License for more details.
 */

#define _GNU_SOURCE
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "utils.h"
#include "label.h"

int label_add(struct label **list, char *fmt, ...)
{
	va_list ap;
	struct label *new, *ptr = *list;
	int err = ENOMEM;

	va_start(ap, fmt);
	new = calloc(sizeof(*new), 1);
	if (!new)
		goto out;
	if (vasprintf(&new->text, fmt, ap) < 0) {
		free(new);
		goto out;
	}

	err = 0;
	if (!ptr) {
		*list = new;
		goto out;
	}
	while (ptr->next)
		ptr = ptr->next;
	ptr->next = new;
out:
	va_end(ap);
	return err;
}

static void label_destruct(struct label *item)
{
	free(item->text);
}

void label_free(struct label *list)
{
	list_free(list, (destruct_f)label_destruct);
}