forked from cory/tildefriends
Cory McWilliams
09ddfffa6b
git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4088 ed5197a5-7fde-0310-b194-c3ffbd925b24
405 lines
17 KiB
Groff
405 lines
17 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "DEFINE_STACK_OF 3"
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.TH DEFINE_STACK_OF 3 "2020-04-21" "1.1.1g" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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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
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/safestack.h>
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\&
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\& STACK_OF(TYPE)
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\& DEFINE_STACK_OF(TYPE)
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\& DEFINE_STACK_OF_CONST(TYPE)
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\& DEFINE_SPECIAL_STACK_OF(FUNCTYPE, TYPE)
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\& DEFINE_SPECIAL_STACK_OF_CONST(FUNCTYPE, TYPE)
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\&
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\& typedef int (*sk_TYPE_compfunc)(const TYPE *const *a, const TYPE *const *b);
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\& typedef TYPE * (*sk_TYPE_copyfunc)(const TYPE *a);
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\& typedef void (*sk_TYPE_freefunc)(TYPE *a);
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\&
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\& int sk_TYPE_num(const STACK_OF(TYPE) *sk);
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\& TYPE *sk_TYPE_value(const STACK_OF(TYPE) *sk, int idx);
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\& STACK_OF(TYPE) *sk_TYPE_new(sk_TYPE_compfunc compare);
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\& STACK_OF(TYPE) *sk_TYPE_new_null(void);
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\& int sk_TYPE_reserve(STACK_OF(TYPE) *sk, int n);
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\& void sk_TYPE_free(const STACK_OF(TYPE) *sk);
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\& void sk_TYPE_zero(const STACK_OF(TYPE) *sk);
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\& TYPE *sk_TYPE_delete(STACK_OF(TYPE) *sk, int i);
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\& TYPE *sk_TYPE_delete_ptr(STACK_OF(TYPE) *sk, TYPE *ptr);
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\& int sk_TYPE_push(STACK_OF(TYPE) *sk, const TYPE *ptr);
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\& int sk_TYPE_unshift(STACK_OF(TYPE) *sk, const TYPE *ptr);
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\& TYPE *sk_TYPE_pop(STACK_OF(TYPE) *sk);
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\& TYPE *sk_TYPE_shift(STACK_OF(TYPE) *sk);
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\& void sk_TYPE_pop_free(STACK_OF(TYPE) *sk, sk_TYPE_freefunc freefunc);
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\& int sk_TYPE_insert(STACK_OF(TYPE) *sk, TYPE *ptr, int idx);
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\& TYPE *sk_TYPE_set(STACK_OF(TYPE) *sk, int idx, const TYPE *ptr);
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\& int sk_TYPE_find(STACK_OF(TYPE) *sk, TYPE *ptr);
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\& int sk_TYPE_find_ex(STACK_OF(TYPE) *sk, TYPE *ptr);
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\& void sk_TYPE_sort(const STACK_OF(TYPE) *sk);
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\& int sk_TYPE_is_sorted(const STACK_OF(TYPE) *sk);
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\& STACK_OF(TYPE) *sk_TYPE_dup(const STACK_OF(TYPE) *sk);
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\& STACK_OF(TYPE) *sk_TYPE_deep_copy(const STACK_OF(TYPE) *sk,
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\& sk_TYPE_copyfunc copyfunc,
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\& sk_TYPE_freefunc freefunc);
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\& sk_TYPE_compfunc (*sk_TYPE_set_cmp_func(STACK_OF(TYPE) *sk,
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\& sk_TYPE_compfunc compare));
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\& STACK_OF(TYPE) *sk_TYPE_new_reserve(sk_TYPE_compfunc compare, int n);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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Applications can create and use their own stacks by placing any of the macros
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described below in a header file. These macros define typesafe inline
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functions that wrap around the utility \fBOPENSSL_sk_\fR \s-1API.\s0
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In the description here, \fI\s-1TYPE\s0\fR is used
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as a placeholder for any of the OpenSSL datatypes, such as \fIX509\fR.
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.PP
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\&\s-1\fBSTACK_OF\s0()\fR returns the name for a stack of the specified \fB\s-1TYPE\s0\fR.
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\&\s-1\fBDEFINE_STACK_OF\s0()\fR creates set of functions for a stack of \fB\s-1TYPE\s0\fR. This
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will mean that type \fB\s-1TYPE\s0\fR is stored in each stack, the type is referenced by
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\&\s-1STACK_OF\s0(\s-1TYPE\s0) and each function name begins with \fIsk_TYPE_\fR. For example:
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.PP
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.Vb 1
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\& TYPE *sk_TYPE_value(STACK_OF(TYPE) *sk, int idx);
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.Ve
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.PP
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\&\s-1\fBDEFINE_STACK_OF_CONST\s0()\fR is identical to \s-1\fBDEFINE_STACK_OF\s0()\fR except
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each element is constant. For example:
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.PP
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.Vb 1
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\& const TYPE *sk_TYPE_value(STACK_OF(TYPE) *sk, int idx);
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.Ve
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.PP
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\&\s-1\fBDEFINE_SPECIAL_STACK_OF\s0()\fR defines a stack of \fB\s-1TYPE\s0\fR but
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each function uses \fB\s-1FUNCNAME\s0\fR in the function name. For example:
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.PP
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.Vb 1
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\& TYPE *sk_FUNCNAME_value(STACK_OF(TYPE) *sk, int idx);
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.Ve
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.PP
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\&\s-1\fBDEFINE_SPECIAL_STACK_OF_CONST\s0()\fR is similar except that each element is
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constant:
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.PP
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.Vb 1
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\& const TYPE *sk_FUNCNAME_value(STACK_OF(TYPE) *sk, int idx);
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.Ve
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.PP
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\&\fBsk_TYPE_num()\fR returns the number of elements in \fBsk\fR or \-1 if \fBsk\fR is
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\&\fB\s-1NULL\s0\fR.
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.PP
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\&\fBsk_TYPE_value()\fR returns element \fBidx\fR in \fBsk\fR, where \fBidx\fR starts at
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zero. If \fBidx\fR is out of range then \fB\s-1NULL\s0\fR is returned.
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.PP
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\&\fBsk_TYPE_new()\fR allocates a new empty stack using comparison function \fBcompare\fR.
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If \fBcompare\fR is \fB\s-1NULL\s0\fR then no comparison function is used. This function is
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equivalent to sk_TYPE_new_reserve(compare, 0).
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.PP
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\&\fBsk_TYPE_new_null()\fR allocates a new empty stack with no comparison function. This
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function is equivalent to sk_TYPE_new_reserve(\s-1NULL, 0\s0).
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.PP
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\&\fBsk_TYPE_reserve()\fR allocates additional memory in the \fBsk\fR structure
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such that the next \fBn\fR calls to \fBsk_TYPE_insert()\fR, \fBsk_TYPE_push()\fR
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or \fBsk_TYPE_unshift()\fR will not fail or cause memory to be allocated
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or reallocated. If \fBn\fR is zero, any excess space allocated in the
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\&\fBsk\fR structure is freed. On error \fBsk\fR is unchanged.
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.PP
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\&\fBsk_TYPE_new_reserve()\fR allocates a new stack. The new stack will have additional
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memory allocated to hold \fBn\fR elements if \fBn\fR is positive. The next \fBn\fR calls
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to \fBsk_TYPE_insert()\fR, \fBsk_TYPE_push()\fR or \fBsk_TYPE_unshift()\fR will not fail or cause
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memory to be allocated or reallocated. If \fBn\fR is zero or less than zero, no
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memory is allocated. \fBsk_TYPE_new_reserve()\fR also sets the comparison function
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\&\fBcompare\fR to the newly created stack. If \fBcompare\fR is \fB\s-1NULL\s0\fR then no
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comparison function is used.
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.PP
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\&\fBsk_TYPE_set_cmp_func()\fR sets the comparison function of \fBsk\fR to \fBcompare\fR.
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The previous comparison function is returned or \fB\s-1NULL\s0\fR if there was
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no previous comparison function.
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.PP
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\&\fBsk_TYPE_free()\fR frees up the \fBsk\fR structure. It does \fBnot\fR free up any
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elements of \fBsk\fR. After this call \fBsk\fR is no longer valid.
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.PP
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\&\fBsk_TYPE_zero()\fR sets the number of elements in \fBsk\fR to zero. It does not free
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\&\fBsk\fR so after this call \fBsk\fR is still valid.
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.PP
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\&\fBsk_TYPE_pop_free()\fR frees up all elements of \fBsk\fR and \fBsk\fR itself. The
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free function \fBfreefunc()\fR is called on each element to free it.
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.PP
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\&\fBsk_TYPE_delete()\fR deletes element \fBi\fR from \fBsk\fR. It returns the deleted
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element or \fB\s-1NULL\s0\fR if \fBi\fR is out of range.
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.PP
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\&\fBsk_TYPE_delete_ptr()\fR deletes element matching \fBptr\fR from \fBsk\fR. It returns
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the deleted element or \fB\s-1NULL\s0\fR if no element matching \fBptr\fR was found.
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.PP
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\&\fBsk_TYPE_insert()\fR inserts \fBptr\fR into \fBsk\fR at position \fBidx\fR. Any existing
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elements at or after \fBidx\fR are moved downwards. If \fBidx\fR is out of range
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the new element is appended to \fBsk\fR. \fBsk_TYPE_insert()\fR either returns the
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number of elements in \fBsk\fR after the new element is inserted or zero if
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an error (such as memory allocation failure) occurred.
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.PP
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\&\fBsk_TYPE_push()\fR appends \fBptr\fR to \fBsk\fR it is equivalent to:
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.PP
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.Vb 1
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\& sk_TYPE_insert(sk, ptr, \-1);
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.Ve
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.PP
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\&\fBsk_TYPE_unshift()\fR inserts \fBptr\fR at the start of \fBsk\fR it is equivalent to:
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.PP
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.Vb 1
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\& sk_TYPE_insert(sk, ptr, 0);
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.Ve
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.PP
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\&\fBsk_TYPE_pop()\fR returns and removes the last element from \fBsk\fR.
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.PP
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\&\fBsk_TYPE_shift()\fR returns and removes the first element from \fBsk\fR.
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.PP
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\&\fBsk_TYPE_set()\fR sets element \fBidx\fR of \fBsk\fR to \fBptr\fR replacing the current
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element. The new element value is returned or \fB\s-1NULL\s0\fR if an error occurred:
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this will only happen if \fBsk\fR is \fB\s-1NULL\s0\fR or \fBidx\fR is out of range.
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.PP
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\&\fBsk_TYPE_find()\fR searches \fBsk\fR for the element \fBptr\fR. In the case
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where no comparison function has been specified, the function performs
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a linear search for a pointer equal to \fBptr\fR. The index of the first
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matching element is returned or \fB\-1\fR if there is no match. In the case
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where a comparison function has been specified, \fBsk\fR is sorted then
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\&\fBsk_TYPE_find()\fR returns the index of a matching element or \fB\-1\fR if there
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is no match. Note that, in this case, the matching element returned is
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not guaranteed to be the first; the comparison function will usually
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compare the values pointed to rather than the pointers themselves and
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the order of elements in \fBsk\fR could change.
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.PP
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\&\fBsk_TYPE_find_ex()\fR operates like \fBsk_TYPE_find()\fR except when a comparison
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function has been specified and no matching element is found. Instead
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of returning \fB\-1\fR, \fBsk_TYPE_find_ex()\fR returns the index of the element
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either before or after the location where \fBptr\fR would be if it were
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present in \fBsk\fR.
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.PP
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\&\fBsk_TYPE_sort()\fR sorts \fBsk\fR using the supplied comparison function.
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.PP
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\&\fBsk_TYPE_is_sorted()\fR returns \fB1\fR if \fBsk\fR is sorted and \fB0\fR otherwise.
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.PP
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\&\fBsk_TYPE_dup()\fR returns a copy of \fBsk\fR. Note the pointers in the copy
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are identical to the original.
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.PP
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\&\fBsk_TYPE_deep_copy()\fR returns a new stack where each element has been copied.
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Copying is performed by the supplied \fBcopyfunc()\fR and freeing by \fBfreefunc()\fR. The
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function \fBfreefunc()\fR is only called if an error occurs.
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.SH "NOTES"
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.IX Header "NOTES"
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Care should be taken when accessing stacks in multi-threaded environments.
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Any operation which increases the size of a stack such as \fBsk_TYPE_insert()\fR or
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\&\fBsk_push()\fR can \*(L"grow\*(R" the size of an internal array and cause race conditions
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if the same stack is accessed in a different thread. Operations such as
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\&\fBsk_find()\fR and \fBsk_sort()\fR can also reorder the stack.
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.PP
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Any comparison function supplied should use a metric suitable
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for use in a binary search operation. That is it should return zero, a
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positive or negative value if \fBa\fR is equal to, greater than
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or less than \fBb\fR respectively.
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.PP
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Care should be taken when checking the return values of the functions
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\&\fBsk_TYPE_find()\fR and \fBsk_TYPE_find_ex()\fR. They return an index to the
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matching element. In particular \fB0\fR indicates a matching first element.
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A failed search is indicated by a \fB\-1\fR return value.
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.PP
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\&\s-1\fBSTACK_OF\s0()\fR, \s-1\fBDEFINE_STACK_OF\s0()\fR, \s-1\fBDEFINE_STACK_OF_CONST\s0()\fR, and
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\&\s-1\fBDEFINE_SPECIAL_STACK_OF\s0()\fR are implemented as macros.
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|
.PP
|
|
The underlying utility \fBOPENSSL_sk_\fR \s-1API\s0 should not be used directly.
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|
It defines these functions: \fBOPENSSL_sk_deep_copy()\fR,
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|
\&\fBOPENSSL_sk_delete()\fR, \fBOPENSSL_sk_delete_ptr()\fR, \fBOPENSSL_sk_dup()\fR,
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|
\&\fBOPENSSL_sk_find()\fR, \fBOPENSSL_sk_find_ex()\fR, \fBOPENSSL_sk_free()\fR,
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|
\&\fBOPENSSL_sk_insert()\fR, \fBOPENSSL_sk_is_sorted()\fR, \fBOPENSSL_sk_new()\fR,
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|
\&\fBOPENSSL_sk_new_null()\fR, \fBOPENSSL_sk_num()\fR, \fBOPENSSL_sk_pop()\fR,
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|
\&\fBOPENSSL_sk_pop_free()\fR, \fBOPENSSL_sk_push()\fR, \fBOPENSSL_sk_reserve()\fR,
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|
\&\fBOPENSSL_sk_set()\fR, \fBOPENSSL_sk_set_cmp_func()\fR, \fBOPENSSL_sk_shift()\fR,
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|
\&\fBOPENSSL_sk_sort()\fR, \fBOPENSSL_sk_unshift()\fR, \fBOPENSSL_sk_value()\fR,
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|
\&\fBOPENSSL_sk_zero()\fR.
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|
.SH "RETURN VALUES"
|
|
.IX Header "RETURN VALUES"
|
|
\&\fBsk_TYPE_num()\fR returns the number of elements in the stack or \fB\-1\fR if the
|
|
passed stack is \fB\s-1NULL\s0\fR.
|
|
.PP
|
|
\&\fBsk_TYPE_value()\fR returns a pointer to a stack element or \fB\s-1NULL\s0\fR if the
|
|
index is out of range.
|
|
.PP
|
|
\&\fBsk_TYPE_new()\fR, \fBsk_TYPE_new_null()\fR and \fBsk_TYPE_new_reserve()\fR return an empty
|
|
stack or \fB\s-1NULL\s0\fR if an error occurs.
|
|
.PP
|
|
\&\fBsk_TYPE_reserve()\fR returns \fB1\fR on successful allocation of the required memory
|
|
or \fB0\fR on error.
|
|
.PP
|
|
\&\fBsk_TYPE_set_cmp_func()\fR returns the old comparison function or \fB\s-1NULL\s0\fR if
|
|
there was no old comparison function.
|
|
.PP
|
|
\&\fBsk_TYPE_free()\fR, \fBsk_TYPE_zero()\fR, \fBsk_TYPE_pop_free()\fR and \fBsk_TYPE_sort()\fR do
|
|
not return values.
|
|
.PP
|
|
\&\fBsk_TYPE_pop()\fR, \fBsk_TYPE_shift()\fR, \fBsk_TYPE_delete()\fR and \fBsk_TYPE_delete_ptr()\fR
|
|
return a pointer to the deleted element or \fB\s-1NULL\s0\fR on error.
|
|
.PP
|
|
\&\fBsk_TYPE_insert()\fR, \fBsk_TYPE_push()\fR and \fBsk_TYPE_unshift()\fR return the total
|
|
number of elements in the stack and 0 if an error occurred.
|
|
.PP
|
|
\&\fBsk_TYPE_set()\fR returns a pointer to the replacement element or \fB\s-1NULL\s0\fR on
|
|
error.
|
|
.PP
|
|
\&\fBsk_TYPE_find()\fR and \fBsk_TYPE_find_ex()\fR return an index to the found element
|
|
or \fB\-1\fR on error.
|
|
.PP
|
|
\&\fBsk_TYPE_is_sorted()\fR returns \fB1\fR if the stack is sorted and \fB0\fR if it is
|
|
not.
|
|
.PP
|
|
\&\fBsk_TYPE_dup()\fR and \fBsk_TYPE_deep_copy()\fR return a pointer to the copy of the
|
|
stack.
|
|
.SH "HISTORY"
|
|
.IX Header "HISTORY"
|
|
Before OpenSSL 1.1.0, this was implemented via macros and not inline functions
|
|
and was not a public \s-1API.\s0
|
|
.PP
|
|
\&\fBsk_TYPE_reserve()\fR and \fBsk_TYPE_new_reserve()\fR were added in OpenSSL 1.1.1.
|
|
.SH "COPYRIGHT"
|
|
.IX Header "COPYRIGHT"
|
|
Copyright 2000\-2017 The OpenSSL Project Authors. All Rights Reserved.
|
|
.PP
|
|
Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file \s-1LICENSE\s0 in the source distribution or at
|
|
<https://www.openssl.org/source/license.html>.
|