mirror of https://github.com/openssl/openssl
127 lines
4.0 KiB
Plaintext
127 lines
4.0 KiB
Plaintext
=pod
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=head1 NAME
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DEFINE_LIST_OF, OSSL_LIST_MEMBER, OSSL_LIST,
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ossl_list_TYPE_init, ossl_list_TYPE_num,
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ossl_list_TYPE_head, ossl_list_TYPE_tail,
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ossl_list_TYPE_next, ossl_list_TYPE_prev,
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ossl_list_TYPE_remove, ossl_list_TYPE_insert_head, ossl_list_TYPE_insert_tail,
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ossl_list_TYPE_insert_before, ossl_list_TYPE_after
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- doubly linked list
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=head1 SYNOPSIS
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=for openssl generic
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#include "internal/list.h"
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OSSL_LIST(name);
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OSSL_LIST_MEMBER(NAME, TYPE);
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DEFINE_LIST_OF(NAME, TYPE);
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void ossl_list_TYPE_init(OSSL_LIST(name) *list);
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size_t ossl_list_TYPE_num(const OSSL_LIST(name) *list);
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type *ossl_list_TYPE_head(const OSSL_LIST(name) *list);
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type *ossl_list_TYPE_tail(const OSSL_LIST(name) *list);
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type *ossl_list_TYPE_next(const type *elem);
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type *ossl_list_TYPE_prev(const type *elem);
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void ossl_list_TYPE_remove(OSSL_LIST(name) *list, type *elem);
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void ossl_list_TYPE_insert_head(OSSL_LIST(name) *list, type *elem);
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void ossl_list_TYPE_insert_tail(OSSL_LIST(name) *list, type *elem);
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void ossl_list_TYPE_insert_before(OSSL_LIST(name) *list, type *existing,
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type *elem);
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void ossl_list_TYPE_insert_after(OSSL_LIST(name) *list, type *existing, type *elem);
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=head1 DESCRIPTION
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Create type safe linked list. These macros define typesafe inline
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functions that implement the various list operations. In the description
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here, B<I<TYPE>> is used as a placeholder for any datatype. Lists are intended to
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be incorporated into other structures and rather than being a standalone data
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structure.
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The OSSL_LIST() macro returns the name for a list of the specified
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B<I<TYPE>>. This is a structure which should be treated as opaque.
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DEFINE_LIST_OF() creates a set of functions for a list of B<I<TYPE>>
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elements with the name B<I<NAME>>. The type is represented
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by B<OSSL_LIST>(B<I<NAME>>) and each function name begins with
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B<ossl_list_I<NAME>_>. The list's linkages are stored in the
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B<OSSL_LIST_MEMBER>(B<I<NAME>>, B<I<TYPE>>) field.
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B<ossl_list_I<NAME>_init>() initialises the memory pointed to by I<list>
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to zero which creates an empty list.
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B<ossl_list_I<NAME>_num>() returns the number of elements in I<list>.
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B<ossl_list_I<NAME>_head>() returns the first element in the I<list>
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or NULL if there are no elements.
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B<ossl_list_I<NAME>_tail>() returns the last element in the I<list>
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or NULL if there are no elements.
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B<ossl_list_I<NAME>_remove>() removes the specified element I<elem> from
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the I<list>. It is illegal to remove an element that isn't in the list.
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B<ossl_list_I<NAME>_insert_head>() inserts the element I<elem>, which
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must not be in the list, into the first position in the I<list>.
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B<ossl_list_I<NAME>_insert_tail>() inserts the element I<elem>, which
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must not be in the list, into the last position in the I<list>.
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B<ossl_list_I<NAME>_insert_before>() inserts the element I<elem>,
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which must not be in the list, into the I<list> immediately before the
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I<existing> element.
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B<ossl_list_I<NAME>_insert_after>() inserts the element I<elem>,
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which must not be in the list, into the I<list> immediately after the
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I<existing> element.
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=head1 RETURN VALUES
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B<ossl_list_I<NAME>_num>() returns the number of elements in the
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list.
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B<ossl_list_I<NAME>_head>(), B<ossl_list_I<NAME>_tail>(),
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B<ossl_list_I<NAME>_next>() and B<ossl_list_I<NAME>_prev>() return
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the specified element in the list.
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=head1 EXAMPLES
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typedef struct item_st ITEM;
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struct item_st {
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...
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OSSL_LIST_MEMBER(new_items, ITEM);
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...
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};
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DEFINE_LIST_OF(new_items, ITEM);
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OSSL_LIST(new_items) new;
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ITEM *p;
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for (p = ossl_list_new_items_head(&st->new); p != NULL;
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p = ossl_list_new_items_next(p))
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/* do something */
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=head1 HISTORY
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The functions described here were all added in OpenSSL 3.2.
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=head1 COPYRIGHT
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Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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