=pod
=head1 NAME
UI_STRING, UI_string_types, UI_get_string_type,
UI_get_input_flags, UI_get0_output_string,
UI_get0_action_string, UI_get0_result_string,
UI_get0_test_string, UI_get_result_minsize,
UI_get_result_maxsize, UI_set_result
- User interface string parsing
=head1 SYNOPSIS
#include <openssl/ui.h>
typedef struct ui_string_st UI_STRING;
enum UI_string_types {
UIT_NONE = 0,
UIT_PROMPT, /* Prompt for a string */
UIT_VERIFY, /* Prompt for a string and verify */
UIT_BOOLEAN, /* Prompt for a yes/no response */
UIT_INFO, /* Send info to the user */
UIT_ERROR /* Send an error message to the user */
};
enum UI_string_types UI_get_string_type(UI_STRING *uis);
int UI_get_input_flags(UI_STRING *uis);
const char *UI_get0_output_string(UI_STRING *uis);
const char *UI_get0_action_string(UI_STRING *uis);
const char *UI_get0_result_string(UI_STRING *uis);
const char *UI_get0_test_string(UI_STRING *uis);
int UI_get_result_minsize(UI_STRING *uis);
int UI_get_result_maxsize(UI_STRING *uis);
int UI_set_result(UI *ui, UI_STRING *uis, const char *result);
=head1 DESCRIPTION
The B<UI_STRING> gets created internally and added to a B<UI> whenever
one of the functions UI_add_input_string(), UI_dup_input_string(),
UI_add_verify_string(), UI_dup_verify_string(),
UI_add_input_boolean(), UI_dup_input_boolean(), UI_add_info_string(),
UI_dup_info_string(), UI_add_error_string() or UI_dup_error_string()
is called.
For a B<UI_METHOD> user, there's no need to know more.
For a B<UI_METHOD> creator, it is of interest to fetch text from these
B<UI_STRING> objects as well as adding results to some of them.
UI_get_string_type() is used to retrieve the type of the given
B<UI_STRING>.
UI_get_input_flags() is used to retrieve the flags associated with the
given B<UI_STRING>.
UI_get0_output_string() is used to retrieve the actual string to
output (prompt, info, error, ...).
UI_get0_action_string() is used to retrieve the action description
associated with a B<UIT_BOOLEAN> type B<UI_STRING>.
For all other B<UI_STRING> types, NULL is returned.
See L<UI_add_input_boolean(3)>.
UI_get0_result_string() is used to retrieve the result of a prompt.
This is only useful for B<UIT_PROMPT> and B<UIT_VERIFY> type strings.
For all other B<UI_STRING> types, NULL is returned.
UI_get0_test_string() is used to retrieve the string to compare the
prompt result with.
This is only useful for B<UIT_VERIFY> type strings.
For all other B<UI_STRING> types, NULL is returned.
UI_get_result_minsize() and UI_get_result_maxsize() are used to
retrieve the minimum and maximum required size of the result.
This is only useful for B<UIT_PROMPT> and B<UIT_VERIFY> type strings.
For all other B<UI_STRING> types, -1 is returned.
UI_set_result() is used to set the result value of a prompt.
For B<UIT_PROMPT> and B<UIT_VERIFY> type UI strings, this sets the
result retrievable with UI_get0_result_string() by copying the
contents of B<result> if its length fits the minimum and maximum size
requirements.
For B<UIT_BOOLEAN> type UI strings, this sets the first character of
the result retrievable with UI_get0_result_string() to the first
B<ok_char> given with UI_add_input_boolean() or UI_dup_input_boolean()
if the B<result> matched any of them, or the first of the
B<cancel_chars> if the B<result> matched any of them, otherwise it's
set to the NUL char C<\0>.
See L<UI_add_input_boolean(3)> for more information on B<ok_chars> and
B<cancel_chars>.
=head1 RETURN VALUES
UI_get_string_type() returns the UI string type.
UI_get_input_flags() returns the UI string flags.
UI_get0_output_string() returns the UI string output string.
UI_get0_action_string() returns the UI string action description
string for B<UIT_BOOLEAN> type UI strings, NULL for any other type.
UI_get0_result_string() returns the UI string result buffer for
B<UIT_PROMPT> and B<UIT_VERIFY> type UI strings, NULL for any other
type.
UI_get0_test_string() returns the UI string action description
string for B<UIT_VERIFY> type UI strings, NULL for any other type.
UI_get_result_minsize() returns the minimum allowed result size for
the UI string for for B<UIT_PROMPT> and B<UIT_VERIFY> type strings,
-1 for any other type.
UI_get_result_maxsize() returns the minimum allowed result size for
the UI string for for B<UIT_PROMPT> and B<UIT_VERIFY> type strings,
-1 for any other type.
UI_set_result() returns 0 on success or when the UI string is of any
type other than B<UIT_PROMPT>, B<UIT_VERIFY> or B<UIT_BOOLEAN>, -1 on
error.
=head1 SEE ALSO
L<UI(3)>
=head1 COPYRIGHT
Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (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
