Implement boolean (yes/no or OK/Cancel, ...) input.

[thirdparty/openssl.git] / crypto / ui / ui_locl.h

/* crypto/ui/ui.h -*- mode:C; c-file-style: "eay" -*- */
/* Written by Richard Levitte (levitte@stacken.kth.se) for the OpenSSL
 * project 2000.
 */
/* ====================================================================
 * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.
 *
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 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
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 *    notice, this list of conditions and the following disclaimer in
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 *    distribution.
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 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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 *    "This product includes software developed by the OpenSSL Project
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 *
 */

#ifndef HEADER_UI_LOCL_H
#define HEADER_UI_LOCL_H

#include <openssl/ui.h>

struct ui_method_st
	{
	char *name;

	/* All the functions return 1 or non-NULL for success and 0 or NULL
	   for failure */

	/* Open whatever channel for this, be it the console, an X window
	   or whatever.
	   This function should use the ex_data structure to save
	   intermediate data. */
	int (*ui_open_session)(UI *ui);

	int (*ui_write_string)(UI *ui, UI_STRING *uis);

	/* Flush the output.  If a GUI dialog box is used, this function can
	   be used to actually display it. */
	int (*ui_flush)(UI *ui);

	int (*ui_read_string)(UI *ui, UI_STRING *uis);

	int (*ui_close_session)(UI *ui);

	/* Construct a prompt in a user-defined manner.  object_desc is a
	   textual short description of the object, for example "pass phrase",
	   and object_name is the name of the object (might be a card name or
	   a file name.
	   The returned string shall always be allocated on the heap with
	   OPENSSL_malloc(), and need to be free'd with OPENSSL_free(). */
	char *(*ui_construct_prompt)(UI *ui, const char *object_desc,
		const char *object_name);
	};

struct ui_string_st
	{
	enum UI_string_types type; /* Input */
	const char *out_string;	/* Input */
	int input_flags;	/* Flags from the user */

	/* The following parameters are completely irrelevant for UIT_INFO,
	   and can therefore be set to 0 or NULL */
	char *result_buf;	/* Input and Output: If not NULL, user-defined
				   with size in result_maxsize.  Otherwise, it
				   may be allocated by the UI routine, meaning
				   result_minsize is going to be overwritten.*/
	union
		{
		struct
			{
			int result_minsize;	/* Input: minimum required
						   size of the result.
						*/
			int result_maxsize;	/* Input: maximum permitted
						   size of the result */

			const char *test_buf;	/* Input: test string to verify
						   against */
			} string_data;
		struct
			{
			const char *action_desc; /* Input */
			const char *ok_chars; /* Input */
			const char *cancel_chars; /* Input */
			} boolean_data;
		} _;

#define OUT_STRING_FREEABLE 0x01
	int flags;		/* flags for internal use */
	};

struct ui_st
	{
	const UI_METHOD *meth;
	STACK_OF(UI_STRING) *strings; /* We might want to prompt for more
					 than one thing at a time, and
					 with different echoing status.  */
	void *user_data;
	CRYPTO_EX_DATA ex_data;

#define UI_FLAG_REDOABLE	0x0001
#define UI_FLAG_PRINT_ERRORS	0x0100
	int flags;
	};

#endif