list.h

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/*
 * Copyright (c) 2015, Xilinx Inc. and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

 
#ifndef __METAL_LIST__H__
#define __METAL_LIST__H__
 
#include <stdbool.h>
#include <stdlib.h>
 
#ifdef __cplusplus
extern "C" {
#endif

 
struct metal_list {
        struct metal_list *next, *prev;
};
 
/*
 * METAL_INIT_LIST - used for initializing an list element in a static struct
 * or global
 */
#define METAL_INIT_LIST(name) { .next = &name, .prev = &name }
/*
 * METAL_DECLARE_LIST - used for defining and initializing a global or
 * static singleton list
 */
#define METAL_DECLARE_LIST(name)                        \
        struct metal_list name = METAL_INIT_LIST(name)
 
static inline void metal_list_init(struct metal_list *list)
{
        list->prev = list;
        list->next = list;
}
 
static inline void metal_list_add_before(struct metal_list *node,
                                         struct metal_list *new_node)
{
        new_node->prev = node->prev;
        new_node->next = node;
        new_node->next->prev = new_node;
        new_node->prev->next = new_node;
}
 
static inline void metal_list_add_after(struct metal_list *node,
                                        struct metal_list *new_node)
{
        new_node->prev = node;
        new_node->next = node->next;
        new_node->next->prev = new_node;
        new_node->prev->next = new_node;
}
 
static inline void metal_list_add_head(struct metal_list *list,
                                       struct metal_list *node)
{
        metal_list_add_after(list, node);
}
 
static inline void metal_list_add_tail(struct metal_list *list,
                                       struct metal_list *node)
{
        metal_list_add_before(list, node);
}
 
static inline int metal_list_is_empty(struct metal_list *list)
{
        return list->next == list;
}
 
static inline void metal_list_del(struct metal_list *node)
{
        node->next->prev = node->prev;
        node->prev->next = node->next;
        node->prev = node;
        node->next = node;
}
 
static inline struct metal_list *metal_list_first(struct metal_list *list)
{
        return metal_list_is_empty(list) ? NULL : list->next;
}

#define metal_list_for_each(list, node)         \
        for ((node) = (list)->next;             \
             (node) != (list);                  \
             (node) = (node)->next)

#define metal_list_for_each_safe(list, temp, node)              \
        for ((node) = (list)->next, (temp) = (node)->next;      \
             (node) != (list);                                  \
             (node) = (temp), (temp) = (node)->next)
 
static inline bool metal_list_find_node(struct metal_list *list,
                                        struct metal_list *node)
{
        struct metal_list *n;
 
        metal_list_for_each(list, n) {
                if (n == node)
                        return true;
        }
        return false;
}

 
#ifdef __cplusplus
}
#endif
 
#endif /* __METAL_LIST__H__ */