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