mirror of
https://github.com/openssl/openssl.git
synced 2024-12-27 06:21:43 +08:00
bb82531f65
OpenSSL uses some POD directives masquerading as 'comment'
('=for comment' etc). This is abusive and confusing. Instead, we use
our own keyword.
=for openssl whatever
=begin openssl
whatever
=end openssl
(we have never used the multiline form, but might start one day)
Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/10048)
277 lines
12 KiB
Plaintext
277 lines
12 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
DEFINE_STACK_OF, DEFINE_STACK_OF_CONST, DEFINE_SPECIAL_STACK_OF,
|
|
DEFINE_SPECIAL_STACK_OF_CONST,
|
|
sk_TYPE_num, sk_TYPE_value, sk_TYPE_new, sk_TYPE_new_null,
|
|
sk_TYPE_reserve, sk_TYPE_free, sk_TYPE_zero, sk_TYPE_delete,
|
|
sk_TYPE_delete_ptr, sk_TYPE_push, sk_TYPE_unshift, sk_TYPE_pop,
|
|
sk_TYPE_shift, sk_TYPE_pop_free, sk_TYPE_insert, sk_TYPE_set,
|
|
sk_TYPE_find, sk_TYPE_find_ex, sk_TYPE_sort, sk_TYPE_is_sorted,
|
|
sk_TYPE_dup, sk_TYPE_deep_copy, sk_TYPE_set_cmp_func, sk_TYPE_new_reserve
|
|
- stack container
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
=for openssl generic
|
|
|
|
#include <openssl/safestack.h>
|
|
|
|
STACK_OF(TYPE)
|
|
DEFINE_STACK_OF(TYPE)
|
|
DEFINE_STACK_OF_CONST(TYPE)
|
|
DEFINE_SPECIAL_STACK_OF(FUNCTYPE, TYPE)
|
|
DEFINE_SPECIAL_STACK_OF_CONST(FUNCTYPE, TYPE)
|
|
|
|
typedef int (*sk_TYPE_compfunc)(const TYPE *const *a, const TYPE *const *b);
|
|
typedef TYPE * (*sk_TYPE_copyfunc)(const TYPE *a);
|
|
typedef void (*sk_TYPE_freefunc)(TYPE *a);
|
|
|
|
int sk_TYPE_num(const STACK_OF(TYPE) *sk);
|
|
TYPE *sk_TYPE_value(const STACK_OF(TYPE) *sk, int idx);
|
|
STACK_OF(TYPE) *sk_TYPE_new(sk_TYPE_compfunc compare);
|
|
STACK_OF(TYPE) *sk_TYPE_new_null(void);
|
|
int sk_TYPE_reserve(STACK_OF(TYPE) *sk, int n);
|
|
void sk_TYPE_free(const STACK_OF(TYPE) *sk);
|
|
void sk_TYPE_zero(const STACK_OF(TYPE) *sk);
|
|
TYPE *sk_TYPE_delete(STACK_OF(TYPE) *sk, int i);
|
|
TYPE *sk_TYPE_delete_ptr(STACK_OF(TYPE) *sk, TYPE *ptr);
|
|
int sk_TYPE_push(STACK_OF(TYPE) *sk, const TYPE *ptr);
|
|
int sk_TYPE_unshift(STACK_OF(TYPE) *sk, const TYPE *ptr);
|
|
TYPE *sk_TYPE_pop(STACK_OF(TYPE) *sk);
|
|
TYPE *sk_TYPE_shift(STACK_OF(TYPE) *sk);
|
|
void sk_TYPE_pop_free(STACK_OF(TYPE) *sk, sk_TYPE_freefunc freefunc);
|
|
int sk_TYPE_insert(STACK_OF(TYPE) *sk, TYPE *ptr, int idx);
|
|
TYPE *sk_TYPE_set(STACK_OF(TYPE) *sk, int idx, const TYPE *ptr);
|
|
int sk_TYPE_find(STACK_OF(TYPE) *sk, TYPE *ptr);
|
|
int sk_TYPE_find_ex(STACK_OF(TYPE) *sk, TYPE *ptr);
|
|
void sk_TYPE_sort(const STACK_OF(TYPE) *sk);
|
|
int sk_TYPE_is_sorted(const STACK_OF(TYPE) *sk);
|
|
STACK_OF(TYPE) *sk_TYPE_dup(const STACK_OF(TYPE) *sk);
|
|
STACK_OF(TYPE) *sk_TYPE_deep_copy(const STACK_OF(TYPE) *sk,
|
|
sk_TYPE_copyfunc copyfunc,
|
|
sk_TYPE_freefunc freefunc);
|
|
sk_TYPE_compfunc (*sk_TYPE_set_cmp_func(STACK_OF(TYPE) *sk,
|
|
sk_TYPE_compfunc compare));
|
|
STACK_OF(TYPE) *sk_TYPE_new_reserve(sk_TYPE_compfunc compare, int n);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
Applications can create and use their own stacks by placing any of the macros
|
|
described below in a header file. These macros define typesafe inline
|
|
functions that wrap around the utility B<OPENSSL_sk_> API.
|
|
In the description here, B<I<TYPE>> is used
|
|
as a placeholder for any of the OpenSSL datatypes, such as B<X509>.
|
|
|
|
STACK_OF() returns the name for a stack of the specified B<I<TYPE>>.
|
|
DEFINE_STACK_OF() creates set of functions for a stack of B<I<TYPE>>. This
|
|
will mean that type B<I<TYPE>> is stored in each stack, the type is referenced by
|
|
B<STACK_OF>(B<I<TYPE>>) and each function name begins with B<sk_I<TYPE>_>.
|
|
For example:
|
|
|
|
TYPE *sk_TYPE_value(STACK_OF(TYPE) *sk, int idx);
|
|
|
|
DEFINE_STACK_OF_CONST() is identical to DEFINE_STACK_OF() except
|
|
each element is constant. For example:
|
|
|
|
const TYPE *sk_TYPE_value(STACK_OF(TYPE) *sk, int idx);
|
|
|
|
DEFINE_SPECIAL_STACK_OF() defines a stack of B<I<TYPE>> but
|
|
each function uses B<FUNCNAME> in the function name. For example:
|
|
|
|
TYPE *sk_FUNCNAME_value(STACK_OF(TYPE) *sk, int idx);
|
|
|
|
DEFINE_SPECIAL_STACK_OF_CONST() is similar except that each element is
|
|
constant:
|
|
|
|
const TYPE *sk_FUNCNAME_value(STACK_OF(TYPE) *sk, int idx);
|
|
|
|
B<sk_I<TYPE>_num>() returns the number of elements in I<sk> or -1 if I<sk> is
|
|
NULL.
|
|
|
|
B<sk_I<TYPE>_value>() returns element I<idx> in I<sk>, where I<idx> starts at
|
|
zero. If I<idx> is out of range then NULL is returned.
|
|
|
|
B<sk_I<TYPE>_new>() allocates a new empty stack using comparison function
|
|
I<compare>. If I<compare> is NULL then no comparison function is used. This
|
|
function is equivalent to B<sk_I<TYPE>_new_reserve>(I<compare>, 0).
|
|
|
|
B<sk_I<TYPE>_new_null>() allocates a new empty stack with no comparison
|
|
function. This function is equivalent to B<sk_I<TYPE>_new_reserve>(NULL, 0).
|
|
|
|
B<sk_I<TYPE>_reserve>() allocates additional memory in the I<sk> structure
|
|
such that the next I<n> calls to B<sk_I<TYPE>_insert>(), B<sk_I<TYPE>_push>()
|
|
or B<sk_I<TYPE>_unshift>() will not fail or cause memory to be allocated
|
|
or reallocated. If I<n> is zero, any excess space allocated in the
|
|
I<sk> structure is freed. On error I<sk> is unchanged.
|
|
|
|
B<sk_I<TYPE>_new_reserve>() allocates a new stack. The new stack will have
|
|
additional memory allocated to hold I<n> elements if I<n> is positive.
|
|
The next I<n> calls to B<sk_I<TYPE>_insert>(), B<sk_I<TYPE>_push>() or
|
|
B<sk_I<TYPE>_unshift>() will not fail or cause memory to be allocated or
|
|
reallocated. If I<n> is zero or less than zero, no memory is allocated.
|
|
B<sk_I<TYPE>_new_reserve>() also sets the comparison function I<compare>
|
|
to the newly created stack. If I<compare> is NULL then no comparison
|
|
function is used.
|
|
|
|
B<sk_I<TYPE>_set_cmp_func>() sets the comparison function of I<sk> to
|
|
I<compare>. The previous comparison function is returned or NULL if there
|
|
was no previous comparison function.
|
|
|
|
B<sk_I<TYPE>_free>() frees up the I<sk> structure. It does I<not> free up any
|
|
elements of I<sk>. After this call I<sk> is no longer valid.
|
|
|
|
B<sk_I<TYPE>_zero>() sets the number of elements in I<sk> to zero. It does not
|
|
free I<sk> so after this call I<sk> is still valid.
|
|
|
|
B<sk_I<TYPE>_pop_free>() frees up all elements of I<sk> and I<sk> itself. The
|
|
free function freefunc() is called on each element to free it.
|
|
|
|
B<sk_I<TYPE>_delete>() deletes element I<i> from I<sk>. It returns the deleted
|
|
element or NULL if I<i> is out of range.
|
|
|
|
B<sk_I<TYPE>_delete_ptr>() deletes element matching I<ptr> from I<sk>. It
|
|
returns the deleted element or NULL if no element matching I<ptr> was found.
|
|
|
|
B<sk_I<TYPE>_insert>() inserts I<ptr> into I<sk> at position I<idx>. Any
|
|
existing elements at or after I<idx> are moved downwards. If I<idx> is out
|
|
of range the new element is appended to I<sk>. B<sk_I<TYPE>_insert>() either
|
|
returns the number of elements in I<sk> after the new element is inserted or
|
|
zero if an error (such as memory allocation failure) occurred.
|
|
|
|
B<sk_I<TYPE>_push>() appends I<ptr> to I<sk> it is equivalent to:
|
|
|
|
sk_TYPE_insert(sk, ptr, -1);
|
|
|
|
B<sk_I<TYPE>_unshift>() inserts I<ptr> at the start of I<sk> it is equivalent
|
|
to:
|
|
|
|
sk_TYPE_insert(sk, ptr, 0);
|
|
|
|
B<sk_I<TYPE>_pop>() returns and removes the last element from I<sk>.
|
|
|
|
B<sk_I<TYPE>_shift>() returns and removes the first element from I<sk>.
|
|
|
|
B<sk_I<TYPE>_set>() sets element I<idx> of I<sk> to I<ptr> replacing the current
|
|
element. The new element value is returned or NULL if an error occurred:
|
|
this will only happen if I<sk> is NULL or I<idx> is out of range.
|
|
|
|
B<sk_I<TYPE>_find>() searches I<sk> for the element I<ptr>. In the case
|
|
where no comparison function has been specified, the function performs
|
|
a linear search for a pointer equal to I<ptr>. The index of the first
|
|
matching element is returned or B<-1> if there is no match. In the case
|
|
where a comparison function has been specified, I<sk> is sorted then
|
|
B<sk_I<TYPE>_find>() returns the index of a matching element or B<-1> if there
|
|
is no match. Note that, in this case, the matching element returned is
|
|
not guaranteed to be the first; the comparison function will usually
|
|
compare the values pointed to rather than the pointers themselves and
|
|
the order of elements in I<sk> could change.
|
|
|
|
B<sk_I<TYPE>_find_ex>() operates like B<sk_I<TYPE>_find>() except when a
|
|
comparison function has been specified and no matching element is found.
|
|
Instead of returning B<-1>, B<sk_I<TYPE>_find_ex>() returns the index of the
|
|
element either before or after the location where I<ptr> would be if it were
|
|
present in I<sk>.
|
|
|
|
B<sk_I<TYPE>_sort>() sorts I<sk> using the supplied comparison function.
|
|
|
|
B<sk_I<TYPE>_is_sorted>() returns B<1> if I<sk> is sorted and B<0> otherwise.
|
|
|
|
B<sk_I<TYPE>_dup>() returns a copy of I<sk>. Note the pointers in the copy
|
|
are identical to the original.
|
|
|
|
B<sk_I<TYPE>_deep_copy>() returns a new stack where each element has been
|
|
copied. Copying is performed by the supplied copyfunc() and freeing by
|
|
freefunc(). The function freefunc() is only called if an error occurs.
|
|
|
|
=head1 NOTES
|
|
|
|
Care should be taken when accessing stacks in multi-threaded environments.
|
|
Any operation which increases the size of a stack such as B<sk_I<TYPE>_insert>()
|
|
or B<sk_I<TYPE>_push>() can "grow" the size of an internal array and cause race
|
|
conditions if the same stack is accessed in a different thread. Operations such
|
|
as B<sk_I<TYPE>_find>() and B<sk_I<TYPE>_sort>() can also reorder the stack.
|
|
|
|
Any comparison function supplied should use a metric suitable
|
|
for use in a binary search operation. That is it should return zero, a
|
|
positive or negative value if I<a> is equal to, greater than
|
|
or less than I<b> respectively.
|
|
|
|
Care should be taken when checking the return values of the functions
|
|
B<sk_I<TYPE>_find>() and B<sk_I<TYPE>_find_ex>(). They return an index to the
|
|
matching element. In particular B<0> indicates a matching first element.
|
|
A failed search is indicated by a B<-1> return value.
|
|
|
|
STACK_OF(), DEFINE_STACK_OF(), DEFINE_STACK_OF_CONST(), and
|
|
DEFINE_SPECIAL_STACK_OF() are implemented as macros.
|
|
|
|
The underlying utility B<OPENSSL_sk_> API should not be used directly.
|
|
It defines these functions: OPENSSL_sk_deep_copy(),
|
|
OPENSSL_sk_delete(), OPENSSL_sk_delete_ptr(), OPENSSL_sk_dup(),
|
|
OPENSSL_sk_find(), OPENSSL_sk_find_ex(), OPENSSL_sk_free(),
|
|
OPENSSL_sk_insert(), OPENSSL_sk_is_sorted(), OPENSSL_sk_new(),
|
|
OPENSSL_sk_new_null(), OPENSSL_sk_num(), OPENSSL_sk_pop(),
|
|
OPENSSL_sk_pop_free(), OPENSSL_sk_push(), OPENSSL_sk_reserve(),
|
|
OPENSSL_sk_set(), OPENSSL_sk_set_cmp_func(), OPENSSL_sk_shift(),
|
|
OPENSSL_sk_sort(), OPENSSL_sk_unshift(), OPENSSL_sk_value(),
|
|
OPENSSL_sk_zero().
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
B<sk_I<TYPE>_num>() returns the number of elements in the stack or B<-1> if the
|
|
passed stack is NULL.
|
|
|
|
B<sk_I<TYPE>_value>() returns a pointer to a stack element or NULL if the
|
|
index is out of range.
|
|
|
|
B<sk_I<TYPE>_new>(), B<sk_I<TYPE>_new_null>() and B<sk_I<TYPE>_new_reserve>()
|
|
return an empty stack or NULL if an error occurs.
|
|
|
|
B<sk_I<TYPE>_reserve>() returns B<1> on successful allocation of the required
|
|
memory or B<0> on error.
|
|
|
|
B<sk_I<TYPE>_set_cmp_func>() returns the old comparison function or NULL if
|
|
there was no old comparison function.
|
|
|
|
B<sk_I<TYPE>_free>(), B<sk_I<TYPE>_zero>(), B<sk_I<TYPE>_pop_free>() and
|
|
B<sk_I<TYPE>_sort>() do not return values.
|
|
|
|
B<sk_I<TYPE>_pop>(), B<sk_I<TYPE>_shift>(), B<sk_I<TYPE>_delete>() and
|
|
B<sk_I<TYPE>_delete_ptr>() return a pointer to the deleted element or NULL
|
|
on error.
|
|
|
|
B<sk_I<TYPE>_insert>(), B<sk_I<TYPE>_push>() and B<sk_I<TYPE>_unshift>() return
|
|
the total number of elements in the stack and 0 if an error occurred.
|
|
|
|
B<sk_I<TYPE>_set>() returns a pointer to the replacement element or NULL on
|
|
error.
|
|
|
|
B<sk_I<TYPE>_find>() and B<sk_I<TYPE>_find_ex>() return an index to the found
|
|
element or B<-1> on error.
|
|
|
|
B<sk_I<TYPE>_is_sorted>() returns B<1> if the stack is sorted and B<0> if it is
|
|
not.
|
|
|
|
B<sk_I<TYPE>_dup>() and B<sk_I<TYPE>_deep_copy>() return a pointer to the copy
|
|
of the stack.
|
|
|
|
=head1 HISTORY
|
|
|
|
Before OpenSSL 1.1.0, this was implemented via macros and not inline functions
|
|
and was not a public API.
|
|
|
|
B<sk_I<TYPE>_reserve>() and B<sk_I<TYPE>_new_reserve>() were added in OpenSSL
|
|
1.1.1.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2000-2017 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
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|