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.\" ========================================================================
.\"
.IX Title "UI_STRING 3ossl"
.TH UI_STRING 3ossl "2023-09-19" "3.0.11" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "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_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
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #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);
\& 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);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fB\s-1UI_STRING\s0\fR gets created internally and added to a \fB\s-1UI\s0\fR whenever
one of the functions \fBUI_add_input_string()\fR, \fBUI_dup_input_string()\fR,
\&\fBUI_add_verify_string()\fR, \fBUI_dup_verify_string()\fR,
\&\fBUI_add_input_boolean()\fR, \fBUI_dup_input_boolean()\fR, \fBUI_add_info_string()\fR,
\&\fBUI_dup_info_string()\fR, \fBUI_add_error_string()\fR or \fBUI_dup_error_string()\fR
is called.
For a \fB\s-1UI_METHOD\s0\fR user, there's no need to know more.
For a \fB\s-1UI_METHOD\s0\fR creator, it is of interest to fetch text from these
\&\fB\s-1UI_STRING\s0\fR objects as well as adding results to some of them.
.PP
\&\fBUI_get_string_type()\fR is used to retrieve the type of the given
\&\fB\s-1UI_STRING\s0\fR.
.PP
\&\fBUI_get_input_flags()\fR is used to retrieve the flags associated with the
given \fB\s-1UI_STRING\s0\fR.
.PP
\&\fBUI_get0_output_string()\fR is used to retrieve the actual string to
output (prompt, info, error, ...).
.PP
\&\fBUI_get0_action_string()\fR is used to retrieve the action description
associated with a \fB\s-1UIT_BOOLEAN\s0\fR type \fB\s-1UI_STRING\s0\fR.
For all other \fB\s-1UI_STRING\s0\fR types, \s-1NULL\s0 is returned.
See \fBUI_add_input_boolean\fR\|(3).
.PP
\&\fBUI_get0_result_string()\fR and \fBUI_get_result_string_length()\fR are used to
retrieve the result of a prompt and its length.
This is only useful for \fB\s-1UIT_PROMPT\s0\fR and \fB\s-1UIT_VERIFY\s0\fR type strings.
For all other \fB\s-1UI_STRING\s0\fR types, \fBUI_get0_result_string()\fR returns \s-1NULL\s0
and \fBUI_get_result_string_length()\fR returns \-1.
.PP
\&\fBUI_get0_test_string()\fR is used to retrieve the string to compare the
prompt result with.
This is only useful for \fB\s-1UIT_VERIFY\s0\fR type strings.
For all other \fB\s-1UI_STRING\s0\fR types, \s-1NULL\s0 is returned.
.PP
\&\fBUI_get_result_minsize()\fR and \fBUI_get_result_maxsize()\fR are used to
retrieve the minimum and maximum required size of the result.
This is only useful for \fB\s-1UIT_PROMPT\s0\fR and \fB\s-1UIT_VERIFY\s0\fR type strings.
For all other \fB\s-1UI_STRING\s0\fR types, \-1 is returned.
.PP
\&\fBUI_set_result_ex()\fR is used to set the result value of a prompt and its length.
For \fB\s-1UIT_PROMPT\s0\fR and \fB\s-1UIT_VERIFY\s0\fR type \s-1UI\s0 strings, this sets the
result retrievable with \fBUI_get0_result_string()\fR by copying the
contents of \fBresult\fR if its length fits the minimum and maximum size
requirements.
For \fB\s-1UIT_BOOLEAN\s0\fR type \s-1UI\s0 strings, this sets the first character of
the result retrievable with \fBUI_get0_result_string()\fR to the first
\&\fBok_char\fR given with \fBUI_add_input_boolean()\fR or \fBUI_dup_input_boolean()\fR
if the \fBresult\fR matched any of them, or the first of the
\&\fBcancel_chars\fR if the \fBresult\fR matched any of them, otherwise it's
set to the \s-1NUL\s0 char \f(CW\*(C`\e0\*(C'\fR.
See \fBUI_add_input_boolean\fR\|(3) for more information on \fBok_chars\fR and
\&\fBcancel_chars\fR.
.PP
\&\fBUI_set_result()\fR does the same thing as \fBUI_set_result_ex()\fR, but calculates
its length internally.
It expects the string to be terminated with a \s-1NUL\s0 byte, and is therefore
only useful with normal C strings.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBUI_get_string_type()\fR returns the \s-1UI\s0 string type.
.PP
\&\fBUI_get_input_flags()\fR returns the \s-1UI\s0 string flags.
.PP
\&\fBUI_get0_output_string()\fR returns the \s-1UI\s0 string output string.
.PP
\&\fBUI_get0_action_string()\fR returns the \s-1UI\s0 string action description
string for \fB\s-1UIT_BOOLEAN\s0\fR type \s-1UI\s0 strings, \s-1NULL\s0 for any other type.
.PP
\&\fBUI_get0_result_string()\fR returns the \s-1UI\s0 string result buffer for
\&\fB\s-1UIT_PROMPT\s0\fR and \fB\s-1UIT_VERIFY\s0\fR type \s-1UI\s0 strings, \s-1NULL\s0 for any other
type.
.PP
\&\fBUI_get_result_string_length()\fR returns the \s-1UI\s0 string result buffer's
content length for \fB\s-1UIT_PROMPT\s0\fR and \fB\s-1UIT_VERIFY\s0\fR type \s-1UI\s0 strings,
\&\-1 for any other type.
.PP
\&\fBUI_get0_test_string()\fR returns the \s-1UI\s0 string action description
string for \fB\s-1UIT_VERIFY\s0\fR type \s-1UI\s0 strings, \s-1NULL\s0 for any other type.
.PP
\&\fBUI_get_result_minsize()\fR returns the minimum allowed result size for
the \s-1UI\s0 string for \fB\s-1UIT_PROMPT\s0\fR and \fB\s-1UIT_VERIFY\s0\fR type strings,
\&\-1 for any other type.
.PP
\&\fBUI_get_result_maxsize()\fR returns the minimum allowed result size for
the \s-1UI\s0 string for \fB\s-1UIT_PROMPT\s0\fR and \fB\s-1UIT_VERIFY\s0\fR type strings,
\&\-1 for any other type.
.PP
\&\fBUI_set_result()\fR returns 0 on success or when the \s-1UI\s0 string is of any
type other than \fB\s-1UIT_PROMPT\s0\fR, \fB\s-1UIT_VERIFY\s0\fR or \fB\s-1UIT_BOOLEAN\s0\fR, \-1 on
error.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\s-1\fBUI\s0\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2001\-2018 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.