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

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);
        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);

DESCRIPTION

       The UI_STRING gets created internally and added to a 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 UI_METHOD user, there's no need to know more.  For a UI_METHOD creator,
       it is of interest to fetch text from these 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 UI_STRING.

       UI_get_input_flags() is used to retrieve the flags associated with the given 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
       UIT_BOOLEAN type UI_STRING.  For all other UI_STRING types, NULL is returned.  See
       UI_add_input_boolean(3).

       UI_get0_result_string() and UI_get_result_string_length() are used to retrieve the result
       of a prompt and its length.  This is only useful for UIT_PROMPT and UIT_VERIFY type
       strings.  For all other UI_STRING types, UI_get0_result_string() returns NULL and
       UI_get_result_string_length() returns -1.

       UI_get0_test_string() is used to retrieve the string to compare the prompt result with.
       This is only useful for UIT_VERIFY type strings.  For all other 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 UIT_PROMPT and UIT_VERIFY
       type strings.  For all other UI_STRING types, -1 is returned.

       UI_set_result_ex() is used to set the result value of a prompt and its length.  For
       UIT_PROMPT and UIT_VERIFY type UI strings, this sets the result retrievable with
       UI_get0_result_string() by copying the contents of result if its length fits the minimum
       and maximum size requirements.  For UIT_BOOLEAN type UI strings, this sets the first
       character of the result retrievable with UI_get0_result_string() to the first ok_char
       given with UI_add_input_boolean() or UI_dup_input_boolean() if the result matched any of
       them, or the first of the cancel_chars if the result matched any of them, otherwise it's
       set to the NUL char "\0".  See UI_add_input_boolean(3) for more information on ok_chars
       and cancel_chars.

       UI_set_result() does the same thing as UI_set_result_ex(), 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.

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 UIT_BOOLEAN
       type UI strings, NULL for any other type.

       UI_get0_result_string() returns the UI string result buffer for UIT_PROMPT and UIT_VERIFY
       type UI strings, NULL for any other type.

       UI_get_result_string_length() returns the UI string result buffer's content length for
       UIT_PROMPT and UIT_VERIFY type UI strings, -1 for any other type.

       UI_get0_test_string() returns the UI string action description string for 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
       UIT_PROMPT and UIT_VERIFY type strings, -1 for any other type.

       UI_get_result_maxsize() returns the minimum allowed result size for the UI string for
       UIT_PROMPT and 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
       UIT_PROMPT, UIT_VERIFY or UIT_BOOLEAN, -1 on error.

SEE ALSO

       UI(3)

COPYRIGHT

       Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (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 <https://www.openssl.org/source/license.html>.