pkgconf/libpkgconf/iter.h

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/*
* iter.h
* Linked lists and iterators.
*
* Copyright (c) 2013 pkgconf authors (see AUTHORS).
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* This software is provided 'as is' and without any warranty, express or
* implied. In no event shall the authors be liable for any damages arising
* from the use of this software.
*/
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#ifndef LIBPKGCONF_ITER_H
#define LIBPKGCONF_ITER_H
#ifdef __cplusplus
extern "C" {
#endif
typedef struct pkgconf_node_ pkgconf_node_t;
struct pkgconf_node_ {
pkgconf_node_t *prev, *next;
void *data;
};
typedef struct {
pkgconf_node_t *head, *tail;
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size_t length;
} pkgconf_list_t;
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#define PKGCONF_LIST_INITIALIZER { NULL, NULL, 0 }
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static inline void
pkgconf_node_insert(pkgconf_node_t *node, void *data, pkgconf_list_t *list)
{
pkgconf_node_t *tnode;
node->data = data;
if (list->head == NULL)
{
list->head = node;
list->tail = node;
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list->length = 1;
return;
}
tnode = list->head;
node->next = tnode;
tnode->prev = node;
list->head = node;
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list->length++;
}
static inline void
pkgconf_node_insert_tail(pkgconf_node_t *node, void *data, pkgconf_list_t *list)
{
pkgconf_node_t *tnode;
node->data = data;
if (list->tail == NULL)
{
list->head = node;
list->tail = node;
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list->length = 1;
return;
}
tnode = list->tail;
node->prev = tnode;
tnode->next = node;
list->tail = node;
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list->length++;
}
static inline void
pkgconf_node_delete(pkgconf_node_t *node, pkgconf_list_t *list)
{
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list->length--;
if (node->prev == NULL)
list->head = node->next;
else
node->prev->next = node->next;
if (node->next == NULL)
list->tail = node->prev;
else
node->next->prev = node->prev;
}
#ifdef __cplusplus
}
#endif
#endif