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/*
* Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#ifndef OSSL_INTERNAL_LIST_H
# define OSSL_INTERNAL_LIST_H
# pragma once
# include <string.h>
# include <assert.h>
# ifdef NDEBUG
# define OSSL_LIST_DBG(x)
# else
# define OSSL_LIST_DBG(x) x;
# endif
# define OSSL_LIST_FOREACH_FROM(p, name, init) \
for ((p) = (init); \
(p) != NULL; \
(p) = ossl_list_##name##_next(p))
# define OSSL_LIST_FOREACH(p, name, l) \
OSSL_LIST_FOREACH_FROM(p, name, ossl_list_##name##_head(l))
# define OSSL_LIST_FOREACH_REV_FROM(p, name, init) \
for ((p) = (init); \
(p) != NULL; \
(p) = ossl_list_##name##_prev(p))
# define OSSL_LIST_FOREACH_REV(p, name, l) \
OSSL_LIST_FOREACH_FROM(p, name, ossl_list_##name##_tail(l))
# define OSSL_LIST_FOREACH_DELSAFE_FROM(p, pn, name, init) \
for ((p) = (init); \
(p) != NULL && (((pn) = ossl_list_##name##_next(p)), 1); \
(p) = (pn))
#define OSSL_LIST_FOREACH_DELSAFE(p, pn, name, l) \
OSSL_LIST_FOREACH_DELSAFE_FROM(p, pn, name, ossl_list_##name##_head(l))
# define OSSL_LIST_FOREACH_REV_DELSAFE_FROM(p, pn, name, init) \
for ((p) = (init); \
(p) != NULL && (((pn) = ossl_list_##name##_prev(p)), 1); \
(p) = (pn))
# define OSSL_LIST_FOREACH_REV_DELSAFE(p, pn, name, l) \
OSSL_LIST_FOREACH_REV_DELSAFE_FROM(p, pn, name, ossl_list_##name##_tail(l))
/* Define a list structure */
# define OSSL_LIST(name) OSSL_LIST_ ## name
/* Define fields to include an element of a list */
# define OSSL_LIST_MEMBER(name, type) \
struct { \
type *next, *prev; \
OSSL_LIST_DBG(struct ossl_list_st_ ## name *list) \
} ossl_list_ ## name
# define DECLARE_LIST_OF(name, type) \
typedef struct ossl_list_st_ ## name OSSL_LIST(name); \
struct ossl_list_st_ ## name { \
type *alpha, *omega; \
size_t num_elems; \
} \
# define DEFINE_LIST_OF_IMPL(name, type) \
static ossl_unused ossl_inline void \
ossl_list_##name##_init(OSSL_LIST(name) *list) \
{ \
memset(list, 0, sizeof(*list)); \
} \
static ossl_unused ossl_inline void \
ossl_list_##name##_init_elem(type *elem) \
{ \
memset(&elem->ossl_list_ ## name, 0, \
sizeof(elem->ossl_list_ ## name)); \
} \
static ossl_unused ossl_inline int \
ossl_list_##name##_is_empty(const OSSL_LIST(name) *list) \
{ \
return list->num_elems == 0; \
} \
static ossl_unused ossl_inline size_t \
ossl_list_##name##_num(const OSSL_LIST(name) *list) \
{ \
return list->num_elems; \
} \
static ossl_unused ossl_inline type * \
ossl_list_##name##_head(const OSSL_LIST(name) *list) \
{ \
assert(list->alpha == NULL \
|| list->alpha->ossl_list_ ## name.list == list); \
return list->alpha; \
} \
static ossl_unused ossl_inline type * \
ossl_list_##name##_tail(const OSSL_LIST(name) *list) \
{ \
assert(list->omega == NULL \
|| list->omega->ossl_list_ ## name.list == list); \
return list->omega; \
} \
static ossl_unused ossl_inline type * \
ossl_list_##name##_next(const type *elem) \
{ \
assert(elem->ossl_list_ ## name.next == NULL \
|| elem->ossl_list_ ## name.next \
->ossl_list_ ## name.prev == elem); \
return elem->ossl_list_ ## name.next; \
} \
static ossl_unused ossl_inline type * \
ossl_list_##name##_prev(const type *elem) \
{ \
assert(elem->ossl_list_ ## name.prev == NULL \
|| elem->ossl_list_ ## name.prev \
->ossl_list_ ## name.next == elem); \
return elem->ossl_list_ ## name.prev; \
} \
static ossl_unused ossl_inline void \
ossl_list_##name##_remove(OSSL_LIST(name) *list, type *elem) \
{ \
assert(elem->ossl_list_ ## name.list == list); \
OSSL_LIST_DBG(elem->ossl_list_ ## name.list = NULL) \
if (list->alpha == elem) \
list->alpha = elem->ossl_list_ ## name.next; \
if (list->omega == elem) \
list->omega = elem->ossl_list_ ## name.prev; \
if (elem->ossl_list_ ## name.prev != NULL) \
elem->ossl_list_ ## name.prev->ossl_list_ ## name.next = \
elem->ossl_list_ ## name.next; \
if (elem->ossl_list_ ## name.next != NULL) \
elem->ossl_list_ ## name.next->ossl_list_ ## name.prev = \
elem->ossl_list_ ## name.prev; \
list->num_elems--; \
memset(&elem->ossl_list_ ## name, 0, \
sizeof(elem->ossl_list_ ## name)); \
} \
static ossl_unused ossl_inline void \
ossl_list_##name##_insert_head(OSSL_LIST(name) *list, type *elem) \
{ \
assert(elem->ossl_list_ ## name.list == NULL); \
OSSL_LIST_DBG(elem->ossl_list_ ## name.list = list) \
if (list->alpha != NULL) \
list->alpha->ossl_list_ ## name.prev = elem; \
elem->ossl_list_ ## name.next = list->alpha; \
elem->ossl_list_ ## name.prev = NULL; \
list->alpha = elem; \
if (list->omega == NULL) \
list->omega = elem; \
list->num_elems++; \
} \
static ossl_unused ossl_inline void \
ossl_list_##name##_insert_tail(OSSL_LIST(name) *list, type *elem) \
{ \
assert(elem->ossl_list_ ## name.list == NULL); \
OSSL_LIST_DBG(elem->ossl_list_ ## name.list = list) \
if (list->omega != NULL) \
list->omega->ossl_list_ ## name.next = elem; \
elem->ossl_list_ ## name.prev = list->omega; \
elem->ossl_list_ ## name.next = NULL; \
list->omega = elem; \
if (list->alpha == NULL) \
list->alpha = elem; \
list->num_elems++; \
} \
static ossl_unused ossl_inline void \
ossl_list_##name##_insert_before(OSSL_LIST(name) *list, type *e, \
type *elem) \
{ \
assert(elem->ossl_list_ ## name.list == NULL); \
OSSL_LIST_DBG(elem->ossl_list_ ## name.list = list) \
elem->ossl_list_ ## name.next = e; \
elem->ossl_list_ ## name.prev = e->ossl_list_ ## name.prev; \
if (e->ossl_list_ ## name.prev != NULL) \
e->ossl_list_ ## name.prev->ossl_list_ ## name.next = elem; \
e->ossl_list_ ## name.prev = elem; \
if (list->alpha == e) \
list->alpha = elem; \
list->num_elems++; \
} \
static ossl_unused ossl_inline void \
ossl_list_##name##_insert_after(OSSL_LIST(name) *list, type *e, \
type *elem) \
{ \
assert(elem->ossl_list_ ## name.list == NULL); \
OSSL_LIST_DBG(elem->ossl_list_ ## name.list = list) \
elem->ossl_list_ ## name.prev = e; \
elem->ossl_list_ ## name.next = e->ossl_list_ ## name.next; \
if (e->ossl_list_ ## name.next != NULL) \
e->ossl_list_ ## name.next->ossl_list_ ## name.prev = elem; \
e->ossl_list_ ## name.next = elem; \
if (list->omega == e) \
list->omega = elem; \
list->num_elems++; \
} \
struct ossl_list_st_ ## name
# define DEFINE_LIST_OF(name, type) \
DECLARE_LIST_OF(name, type); \
DEFINE_LIST_OF_IMPL(name, type)
#endif
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