=pod
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=head1 NAME
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OSSL_STORE_expect,
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OSSL_STORE_supports_search,
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OSSL_STORE_find
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- Specify what object type is expected
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=head1 SYNOPSIS
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#include <openssl/store.h>
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int OSSL_STORE_expect(OSSL_STORE_CTX *ctx, int expected_type);
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int OSSL_STORE_supports_search(OSSL_STORE_CTX *ctx, int criterion_type);
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int OSSL_STORE_find(OSSL_STORE_CTX *ctx, OSSL_STORE_SEARCH *search);
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=head1 DESCRIPTION
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OSSL_STORE_expect() helps applications filter what OSSL_STORE_load() returns
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by specifying a B<OSSL_STORE_INFO> type.
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For example, if C<file:/foo/bar/store.pem> contains several different objects
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and only the certificates are interesting, the application can simply say
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that it expects the type B<OSSL_STORE_INFO_CERT>.
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All known object types (see L<OSSL_STORE_INFO(3)/SUPPORTED OBJECTS>)
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except for B<OSSL_STORE_INFO_NAME> are supported.
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OSSL_STORE_find() helps applications specify a criterion for a more fine
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grained search of objects.
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OSSL_STORE_supports_search() checks if the loader of the given OSSL_STORE
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context supports the given search type.
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See L<OSSL_STORE_SEARCH/SUPPORTED CRITERION TYPES> for information on the
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supported search criterion types.
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OSSL_STORE_expect() and OSSL_STORE_find I<must> be called before the first
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OSSL_STORE_load() of a given session, or they will fail.
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=head1 NOTES
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If a more elaborate filter is required by the application, a better choice
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would be to use a post-processing function.
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See L<OSSL_STORE_open(3)> for more information.
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However, some loaders may take advantage of the knowledge of an expected type
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to make object retrieval more efficient, so if a single type is expected, this
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method is usually preferable.
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=head1 RETURN VALUES
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OSSL_STORE_expect() returns 1 on success, or 0 on failure.
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OSSL_STORE_supports_search() returns 1 if the criterion is supported, or 0
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otherwise.
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OSSL_STORE_find() returns 1 on success, or 0 on failure.
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=head1 SEE ALSO
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L<ossl_store(7)>, L<OSSL_STORE_INFO(3)>, L<OSSL_STORE_SEARCH(3)>,
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L<OSSL_STORE_load(3)>
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=head1 HISTORY
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OSSL_STORE_expect(), OSSL_STORE_supports_search() and OSSL_STORE_find()
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were added in OpenSSL 1.1.1.
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=head1 COPYRIGHT
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Copyright 2018-2019 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (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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