1=pod
2
3=head1 NAME
4
5UI_STRING, UI_string_types, UI_get_string_type,
6UI_get_input_flags, UI_get0_output_string,
7UI_get0_action_string, UI_get0_result_string, UI_get_result_string_length,
8UI_get0_test_string, UI_get_result_minsize,
9UI_get_result_maxsize, UI_set_result, UI_set_result_ex
10- User interface string parsing
11
12=head1 SYNOPSIS
13
14 #include <openssl/ui.h>
15
16 typedef struct ui_string_st UI_STRING;
17
18 enum UI_string_types {
19     UIT_NONE = 0,
20     UIT_PROMPT,                 /* Prompt for a string */
21     UIT_VERIFY,                 /* Prompt for a string and verify */
22     UIT_BOOLEAN,                /* Prompt for a yes/no response */
23     UIT_INFO,                   /* Send info to the user */
24     UIT_ERROR                   /* Send an error message to the user */
25 };
26
27 enum UI_string_types UI_get_string_type(UI_STRING *uis);
28 int UI_get_input_flags(UI_STRING *uis);
29 const char *UI_get0_output_string(UI_STRING *uis);
30 const char *UI_get0_action_string(UI_STRING *uis);
31 const char *UI_get0_result_string(UI_STRING *uis);
32 int UI_get_result_string_length(UI_STRING *uis);
33 const char *UI_get0_test_string(UI_STRING *uis);
34 int UI_get_result_minsize(UI_STRING *uis);
35 int UI_get_result_maxsize(UI_STRING *uis);
36 int UI_set_result(UI *ui, UI_STRING *uis, const char *result);
37 int UI_set_result_ex(UI *ui, UI_STRING *uis, const char *result, int len);
38
39=head1 DESCRIPTION
40
41The B<UI_STRING> gets created internally and added to a B<UI> whenever
42one of the functions UI_add_input_string(), UI_dup_input_string(),
43UI_add_verify_string(), UI_dup_verify_string(),
44UI_add_input_boolean(), UI_dup_input_boolean(), UI_add_info_string(),
45UI_dup_info_string(), UI_add_error_string() or UI_dup_error_string()
46is called.
47For a B<UI_METHOD> user, there's no need to know more.
48For a B<UI_METHOD> creator, it is of interest to fetch text from these
49B<UI_STRING> objects as well as adding results to some of them.
50
51UI_get_string_type() is used to retrieve the type of the given
52B<UI_STRING>.
53
54UI_get_input_flags() is used to retrieve the flags associated with the
55given B<UI_STRING>.
56
57UI_get0_output_string() is used to retrieve the actual string to
58output (prompt, info, error, ...).
59
60UI_get0_action_string() is used to retrieve the action description
61associated with a B<UIT_BOOLEAN> type B<UI_STRING>.
62For all other B<UI_STRING> types, NULL is returned.
63See L<UI_add_input_boolean(3)>.
64
65UI_get0_result_string() and UI_get_result_string_length() are used to
66retrieve the result of a prompt and its length.
67This is only useful for B<UIT_PROMPT> and B<UIT_VERIFY> type strings.
68For all other B<UI_STRING> types, UI_get0_result_string() returns NULL
69and UI_get_result_string_length() returns -1.
70
71UI_get0_test_string() is used to retrieve the string to compare the
72prompt result with.
73This is only useful for B<UIT_VERIFY> type strings.
74For all other B<UI_STRING> types, NULL is returned.
75
76UI_get_result_minsize() and UI_get_result_maxsize() are used to
77retrieve the minimum and maximum required size of the result.
78This is only useful for B<UIT_PROMPT> and B<UIT_VERIFY> type strings.
79For all other B<UI_STRING> types, -1 is returned.
80
81UI_set_result_ex() is used to set the result value of a prompt and its length.
82For B<UIT_PROMPT> and B<UIT_VERIFY> type UI strings, this sets the
83result retrievable with UI_get0_result_string() by copying the
84contents of B<result> if its length fits the minimum and maximum size
85requirements.
86For B<UIT_BOOLEAN> type UI strings, this sets the first character of
87the result retrievable with UI_get0_result_string() to the first
88B<ok_char> given with UI_add_input_boolean() or UI_dup_input_boolean()
89if the B<result> matched any of them, or the first of the
90B<cancel_chars> if the B<result> matched any of them, otherwise it's
91set to the NUL char C<\0>.
92See L<UI_add_input_boolean(3)> for more information on B<ok_chars> and
93B<cancel_chars>.
94
95UI_set_result() does the same thing as UI_set_result_ex(), but calculates
96its length internally.
97It expects the string to be terminated with a NUL byte, and is therefore
98only useful with normal C strings.
99
100=head1 RETURN VALUES
101
102UI_get_string_type() returns the UI string type.
103
104UI_get_input_flags() returns the UI string flags.
105
106UI_get0_output_string() returns the UI string output string.
107
108UI_get0_action_string() returns the UI string action description
109string for B<UIT_BOOLEAN> type UI strings, NULL for any other type.
110
111UI_get0_result_string() returns the UI string result buffer for
112B<UIT_PROMPT> and B<UIT_VERIFY> type UI strings, NULL for any other
113type.
114
115UI_get_result_string_length() returns the UI string result buffer's
116content length for B<UIT_PROMPT> and B<UIT_VERIFY> type UI strings,
117-1 for any other type.
118
119UI_get0_test_string() returns the UI string action description
120string for B<UIT_VERIFY> type UI strings, NULL for any other type.
121
122UI_get_result_minsize() returns the minimum allowed result size for
123the UI string for B<UIT_PROMPT> and B<UIT_VERIFY> type strings,
124-1 for any other type.
125
126UI_get_result_maxsize() returns the minimum allowed result size for
127the UI string for B<UIT_PROMPT> and B<UIT_VERIFY> type strings,
128-1 for any other type.
129
130UI_set_result() returns 0 on success or when the UI string is of any
131type other than B<UIT_PROMPT>, B<UIT_VERIFY> or B<UIT_BOOLEAN>, -1 on
132error.
133
134=head1 SEE ALSO
135
136L<UI(3)>
137
138=head1 COPYRIGHT
139
140Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.
141
142Licensed under the Apache License 2.0 (the "License").  You may not use
143this file except in compliance with the License.  You can obtain a copy
144in the file LICENSE in the source distribution or at
145L<https://www.openssl.org/source/license.html>.
146
147=cut
148
149