1UI_STRING(3ossl)                    OpenSSL                   UI_STRING(3ossl)
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NAME

6       UI_STRING, UI_string_types, UI_get_string_type, UI_get_input_flags,
7       UI_get0_output_string, UI_get0_action_string, UI_get0_result_string,
8       UI_get_result_string_length, UI_get0_test_string,
9       UI_get_result_minsize, UI_get_result_maxsize, UI_set_result,
10       UI_set_result_ex - User interface string parsing
11

SYNOPSIS

13        #include <openssl/ui.h>
14
15        typedef struct ui_string_st UI_STRING;
16
17        enum UI_string_types {
18            UIT_NONE = 0,
19            UIT_PROMPT,                 /* Prompt for a string */
20            UIT_VERIFY,                 /* Prompt for a string and verify */
21            UIT_BOOLEAN,                /* Prompt for a yes/no response */
22            UIT_INFO,                   /* Send info to the user */
23            UIT_ERROR                   /* Send an error message to the user */
24        };
25
26        enum UI_string_types UI_get_string_type(UI_STRING *uis);
27        int UI_get_input_flags(UI_STRING *uis);
28        const char *UI_get0_output_string(UI_STRING *uis);
29        const char *UI_get0_action_string(UI_STRING *uis);
30        const char *UI_get0_result_string(UI_STRING *uis);
31        int UI_get_result_string_length(UI_STRING *uis);
32        const char *UI_get0_test_string(UI_STRING *uis);
33        int UI_get_result_minsize(UI_STRING *uis);
34        int UI_get_result_maxsize(UI_STRING *uis);
35        int UI_set_result(UI *ui, UI_STRING *uis, const char *result);
36        int UI_set_result_ex(UI *ui, UI_STRING *uis, const char *result, int len);
37

DESCRIPTION

39       The UI_STRING gets created internally and added to a UI whenever one of
40       the functions UI_add_input_string(), UI_dup_input_string(),
41       UI_add_verify_string(), UI_dup_verify_string(), UI_add_input_boolean(),
42       UI_dup_input_boolean(), UI_add_info_string(), UI_dup_info_string(),
43       UI_add_error_string() or UI_dup_error_string() is called.  For a
44       UI_METHOD user, there's no need to know more.  For a UI_METHOD creator,
45       it is of interest to fetch text from these UI_STRING objects as well as
46       adding results to some of them.
47
48       UI_get_string_type() is used to retrieve the type of the given
49       UI_STRING.
50
51       UI_get_input_flags() is used to retrieve the flags associated with the
52       given UI_STRING.
53
54       UI_get0_output_string() is used to retrieve the actual string to output
55       (prompt, info, error, ...).
56
57       UI_get0_action_string() is used to retrieve the action description
58       associated with a UIT_BOOLEAN type UI_STRING.  For all other UI_STRING
59       types, NULL is returned.  See UI_add_input_boolean(3).
60
61       UI_get0_result_string() and UI_get_result_string_length() are used to
62       retrieve the result of a prompt and its length.  This is only useful
63       for UIT_PROMPT and UIT_VERIFY type strings.  For all other UI_STRING
64       types, UI_get0_result_string() returns NULL and
65       UI_get_result_string_length() returns -1.
66
67       UI_get0_test_string() is used to retrieve the string to compare the
68       prompt result with.  This is only useful for UIT_VERIFY type strings.
69       For all other UI_STRING types, NULL is returned.
70
71       UI_get_result_minsize() and UI_get_result_maxsize() are used to
72       retrieve the minimum and maximum required size of the result.  This is
73       only useful for UIT_PROMPT and UIT_VERIFY type strings.  For all other
74       UI_STRING types, -1 is returned.
75
76       UI_set_result_ex() is used to set the result value of a prompt and its
77       length.  For UIT_PROMPT and UIT_VERIFY type UI strings, this sets the
78       result retrievable with UI_get0_result_string() by copying the contents
79       of result if its length fits the minimum and maximum size requirements.
80       For UIT_BOOLEAN type UI strings, this sets the first character of the
81       result retrievable with UI_get0_result_string() to the first ok_char
82       given with UI_add_input_boolean() or UI_dup_input_boolean() if the
83       result matched any of them, or the first of the cancel_chars if the
84       result matched any of them, otherwise it's set to the NUL char "\0".
85       See UI_add_input_boolean(3) for more information on ok_chars and
86       cancel_chars.
87
88       UI_set_result() does the same thing as UI_set_result_ex(), but
89       calculates its length internally.  It expects the string to be
90       terminated with a NUL byte, and is therefore only useful with normal C
91       strings.
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RETURN VALUES

94       UI_get_string_type() returns the UI string type.
95
96       UI_get_input_flags() returns the UI string flags.
97
98       UI_get0_output_string() returns the UI string output string.
99
100       UI_get0_action_string() returns the UI string action description string
101       for UIT_BOOLEAN type UI strings, NULL for any other type.
102
103       UI_get0_result_string() returns the UI string result buffer for
104       UIT_PROMPT and UIT_VERIFY type UI strings, NULL for any other type.
105
106       UI_get_result_string_length() returns the UI string result buffer's
107       content length for UIT_PROMPT and UIT_VERIFY type UI strings, -1 for
108       any other type.
109
110       UI_get0_test_string() returns the UI string action description string
111       for UIT_VERIFY type UI strings, NULL for any other type.
112
113       UI_get_result_minsize() returns the minimum allowed result size for the
114       UI string for UIT_PROMPT and UIT_VERIFY type strings, -1 for any other
115       type.
116
117       UI_get_result_maxsize() returns the minimum allowed result size for the
118       UI string for UIT_PROMPT and UIT_VERIFY type strings, -1 for any other
119       type.
120
121       UI_set_result() returns 0 on success or when the UI string is of any
122       type other than UIT_PROMPT, UIT_VERIFY or UIT_BOOLEAN, -1 on error.
123

SEE ALSO

125       UI(3)
126
128       Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.
129
130       Licensed under the Apache License 2.0 (the "License").  You may not use
131       this file except in compliance with the License.  You can obtain a copy
132       in the file LICENSE in the source distribution or at
133       <https://www.openssl.org/source/license.html>.
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1373.0.5                             2022-07-05                  UI_STRING(3ossl)
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