mirror of https://github.com/openssl/openssl.git
95 lines
3.1 KiB
Plaintext
95 lines
3.1 KiB
Plaintext
=pod
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=head1 NAME
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ossl_namemap_new, ossl_namemap_free, ossl_namemap_stored,
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ossl_namemap_add, ossl_namemap_name2num, ossl_namemap_doall_names
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- internal number E<lt>-E<gt> name map
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=head1 SYNOPSIS
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#include "internal/cryptlib.h"
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OSSL_NAMEMAP *ossl_namemap_stored(OPENSSL_CTX *libctx);
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OSSL_NAMEMAP *ossl_namemap_new(void);
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void ossl_namemap_free(OSSL_NAMEMAP *namemap);
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int ossl_namemap_add(OSSL_NAMEMAP *namemap, int number, const char *name);
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int ossl_namemap_name2num(const OSSL_NAMEMAP *namemap, const char *name);
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void ossl_namemap_doall_names(const OSSL_NAMEMAP *namemap, int number,
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void (*fn)(const char *name, void *data),
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void *data);
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=head1 DESCRIPTION
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A B<OSSL_NAMEMAP> is a one-to-many number E<lt>-E<gt> names map, which
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can be used to give any arbitrary set of names (any string) a unique
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dynamic identity that is valid throughout the lifetime of the associated
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library context.
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ossl_namemap_new() and ossl_namemap_free() construct and destruct a
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new B<OSSL_NAMEMAP>.
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This is suitable to use when the B<OSSL_NAMEMAP> is embedded in other
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structures, or should be independent for any reason.
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ossl_namemap_stored() finds or auto-creates the default namemap in the
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given library context.
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The returned B<OSSL_NAMEMAP> can't be destructed using
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ossl_namemap_free().
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ossl_namemap_add() adds a new name to the namemap if it's not already
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present.
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If the given I<number> is zero, a new number will be allocated to
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identify this I<name>.
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If the given I<number> is non-zero, the I<name> is added to the set of
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names already associated with that number.
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ossl_namemap_name2num() finds the number corresponding to the given
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I<name>.
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ossl_namemap_doall_names() walks through all names associated with
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I<number> in the given I<namemap> and calls the function I<fn> for
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each of them.
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I<fn> is also passed the I<data> argument, which allows any caller to
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pass extra data for that function to use.
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=head1 RETURN VALUES
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ossl_namemap_new() and ossl_namemap_stored() return the pointer to a
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B<OSSL_NAMEMAP>, or NULL on error.
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ossl_namemap_add() returns the number associated with the added
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string, or zero on error.
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ossl_namemap_num2names() returns a pointer to a NULL-terminated list of
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pointers to the names corresponding to the given number, or NULL if
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it's undefined in the given B<OSSL_NAMEMAP>.
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ossl_namemap_name2num() returns the number corresponding to the given
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name, or 0 if it's undefined in the given B<OSSL_NAMEMAP>.
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=head1 NOTES
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The result from ossl_namemap_num2names() isn't thread safe, other threads
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dealing with the same namemap may cause the list of names to change
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location.
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It is therefore strongly recommended to only use the result in code
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guarded by a thread lock.
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=head1 HISTORY
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The functions described here were all added in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2019 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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