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/**
* collectd - src/utils_llist.c
* Copyright (C) 2006 Florian Forster <octo at verplant.org>
*
* This program is free software; you can redistribute it and/
* or modify it under the terms of the GNU General Public Li-
* cence as published by the Free Software Foundation; only
* version 2 of the Licence is applicable.
*
* This program is distributed in the hope that it will be use-
* ful, but WITHOUT ANY WARRANTY; without even the implied war-
* ranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public Licence for more details.
*
* You should have received a copy of the GNU General Public
* Licence along with this program; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
* USA.
*
* Authors:
* Florian Forster <octo at verplant.org>
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include "utils_llist.h"
/*
* Private data types
*/
struct llist_s
{
llentry_t *head;
llentry_t *tail;
int size;
};
/*
* Public functions
*/
llist_t *llist_create (void)
{
llist_t *ret;
ret = (llist_t *) malloc (sizeof (llist_t));
if (ret == NULL)
return (NULL);
memset (ret, '\0', sizeof (llist_t));
return (ret);
}
void llist_destroy (llist_t *l)
{
llentry_t *e_this;
llentry_t *e_next;
if (l == NULL)
return;
for (e_this = l->head; e_this != NULL; e_this = e_next)
{
e_next = e_this->next;
llentry_destroy (e_this);
}
free (l);
}
llentry_t *llentry_create (char *key, void *value)
{
llentry_t *e;
e = (llentry_t *) malloc (sizeof (llentry_t));
if (e)
{
e->key = key;
e->value = value;
e->next = NULL;
}
return (e);
}
void llentry_destroy (llentry_t *e)
{
free (e);
}
void llist_append (llist_t *l, llentry_t *e)
{
e->next = NULL;
if (l->tail == NULL)
l->head = e;
else
l->tail->next = e;
l->tail = e;
++(l->size);
}
void llist_prepend (llist_t *l, llentry_t *e)
{
e->next = l->head;
l->head = e;
if (l->tail == NULL)
l->tail = e;
++(l->size);
}
void llist_remove (llist_t *l, llentry_t *e)
{
llentry_t *prev;
prev = l->head;
while ((prev != NULL) && (prev->next != e))
prev = prev->next;
if (prev != NULL)
prev->next = e->next;
if (l->head == e)
l->head = e->next;
if (l->tail == e)
l->tail = prev;
--(l->size);
}
int llist_size (llist_t *l)
{
return (l ? l->size : 0);
}
static int llist_strcmp (llentry_t *e, void *ud)
{
if ((e == NULL) || (ud == NULL))
return (-1);
return (strcmp (e->key, (const char *)ud));
}
llentry_t *llist_search (llist_t *l, const char *key)
{
return (llist_search_custom (l, llist_strcmp, (void *)key));
}
llentry_t *llist_search_custom (llist_t *l,
int (*compare) (llentry_t *, void *), void *user_data)
{
llentry_t *e;
if (l == NULL)
return (NULL);
e = l->head;
while (e != NULL) {
llentry_t *next = e->next;
if (compare (e, user_data) == 0)
break;
e = next;
}
return (e);
}
llentry_t *llist_head (llist_t *l)
{
if (l == NULL)
return (NULL);
return (l->head);
}
llentry_t *llist_tail (llist_t *l)
{
if (l == NULL)
return (NULL);
return (l->tail);
}
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