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<ul>
<li><a href="#name">NAME</a></li>
<li><a href="#synopsis">SYNOPSIS</a></li>
<li><a href="#description">DESCRIPTION</a></li>
<li><a href="#return_values">RETURN VALUES</a></li>
<li><a href="#see_also">SEE ALSO</a></li>
<li><a href="#copyright">COPYRIGHT</a></li>
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<p>
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<hr />
<h1><a name="name">NAME</a></h1>
<p>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_get_result_string_length,
UI_get0_test_string, UI_get_result_minsize,
UI_get_result_maxsize, UI_set_result, UI_set_result_ex
- User interface string parsing</p>
<p>
</p>
<hr />
<h1><a name="synopsis">SYNOPSIS</a></h1>
<pre>
#include <openssl/ui.h></pre>
<pre>
typedef struct ui_string_st UI_STRING;</pre>
<pre>
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 */
};</pre>
<pre>
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);
int UI_get_result_string_length(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);
int UI_set_result_ex(UI *ui, UI_STRING *uis, const char *result, int len);</pre>
<p>
</p>
<hr />
<h1><a name="description">DESCRIPTION</a></h1>
<p>The <strong>UI_STRING</strong> gets created internally and added to a <strong>UI</strong> whenever
one of the functions <code>UI_add_input_string()</code>, <code>UI_dup_input_string()</code>,
<code>UI_add_verify_string()</code>, <code>UI_dup_verify_string()</code>,
<code>UI_add_input_boolean()</code>, <code>UI_dup_input_boolean()</code>, <code>UI_add_info_string()</code>,
<code>UI_dup_info_string()</code>, <code>UI_add_error_string()</code> or <code>UI_dup_error_string()</code>
is called.
For a <strong>UI_METHOD</strong> user, there's no need to know more.
For a <strong>UI_METHOD</strong> creator, it is of interest to fetch text from these
<strong>UI_STRING</strong> objects as well as adding results to some of them.</p>
<p><code>UI_get_string_type()</code> is used to retrieve the type of the given
<strong>UI_STRING</strong>.</p>
<p><code>UI_get_input_flags()</code> is used to retrieve the flags associated with the
given <strong>UI_STRING</strong>.</p>
<p>UI_get0_output_string() is used to retrieve the actual string to
output (prompt, info, error, ...).</p>
<p>UI_get0_action_string() is used to retrieve the action description
associated with a <strong>UIT_BOOLEAN</strong> type <strong>UI_STRING</strong>.
For all other <strong>UI_STRING</strong> types, NULL is returned.
See <em>UI_add_input_boolean(3)</em>.</p>
<p>UI_get0_result_string() and <code>UI_get_result_string_length()</code> are used to
retrieve the result of a prompt and its length.
This is only useful for <strong>UIT_PROMPT</strong> and <strong>UIT_VERIFY</strong> type strings.
For all other <strong>UI_STRING</strong> types, UI_get0_result_string() returns NULL
and <code>UI_get_result_string_length()</code> returns -1.</p>
<p>UI_get0_test_string() is used to retrieve the string to compare the
prompt result with.
This is only useful for <strong>UIT_VERIFY</strong> type strings.
For all other <strong>UI_STRING</strong> types, NULL is returned.</p>
<p><code>UI_get_result_minsize()</code> and <code>UI_get_result_maxsize()</code> are used to
retrieve the minimum and maximum required size of the result.
This is only useful for <strong>UIT_PROMPT</strong> and <strong>UIT_VERIFY</strong> type strings.
For all other <strong>UI_STRING</strong> types, -1 is returned.</p>
<p><code>UI_set_result_ex()</code> is used to set the result value of a prompt and its length.
For <strong>UIT_PROMPT</strong> and <strong>UIT_VERIFY</strong> type UI strings, this sets the
result retrievable with UI_get0_result_string() by copying the
contents of <strong>result</strong> if its length fits the minimum and maximum size
requirements.
For <strong>UIT_BOOLEAN</strong> type UI strings, this sets the first character of
the result retrievable with UI_get0_result_string() to the first
<strong>ok_char</strong> given with <code>UI_add_input_boolean()</code> or <code>UI_dup_input_boolean()</code>
if the <strong>result</strong> matched any of them, or the first of the
<strong>cancel_chars</strong> if the <strong>result</strong> matched any of them, otherwise it's
set to the NUL char <code>\0</code>.
See <em>UI_add_input_boolean(3)</em> for more information on <strong>ok_chars</strong> and
<strong>cancel_chars</strong>.</p>
<p><code>UI_set_result()</code> does the same thing as <code>UI_set_result_ex()</code>, but calculates
its length internally.
It expects the string to be terminated with a NUL byte, and is therefore
only useful with normal C strings.</p>
<p>
</p>
<hr />
<h1><a name="return_values">RETURN VALUES</a></h1>
<p><code>UI_get_string_type()</code> returns the UI string type.</p>
<p><code>UI_get_input_flags()</code> returns the UI string flags.</p>
<p>UI_get0_output_string() returns the UI string output string.</p>
<p>UI_get0_action_string() returns the UI string action description
string for <strong>UIT_BOOLEAN</strong> type UI strings, NULL for any other type.</p>
<p>UI_get0_result_string() returns the UI string result buffer for
<strong>UIT_PROMPT</strong> and <strong>UIT_VERIFY</strong> type UI strings, NULL for any other
type.</p>
<p><code>UI_get_result_string_length()</code> returns the UI string result buffer's
content length for <strong>UIT_PROMPT</strong> and <strong>UIT_VERIFY</strong> type UI strings,
-1 for any other type.</p>
<p>UI_get0_test_string() returns the UI string action description
string for <strong>UIT_VERIFY</strong> type UI strings, NULL for any other type.</p>
<p><code>UI_get_result_minsize()</code> returns the minimum allowed result size for
the UI string for <strong>UIT_PROMPT</strong> and <strong>UIT_VERIFY</strong> type strings,
-1 for any other type.</p>
<p><code>UI_get_result_maxsize()</code> returns the minimum allowed result size for
the UI string for <strong>UIT_PROMPT</strong> and <strong>UIT_VERIFY</strong> type strings,
-1 for any other type.</p>
<p><code>UI_set_result()</code> returns 0 on success or when the UI string is of any
type other than <strong>UIT_PROMPT</strong>, <strong>UIT_VERIFY</strong> or <strong>UIT_BOOLEAN</strong>, -1 on
error.</p>
<p>
</p>
<hr />
<h1><a name="see_also">SEE ALSO</a></h1>
<p><em>UI(3)</em></p>
<p>
</p>
<hr />
<h1><a name="copyright">COPYRIGHT</a></h1>
<p>Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.</p>
<p>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
<a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>
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