crypto/ui/ui_lib.c

/* crypto/ui/ui_lib.c -*- mode:C; c-file-style: "eay" -*- */
/* Written by Richard Levitte (richard@levitte.org) for the OpenSSL
 * project 2001.
 */
/* ====================================================================
 * Copyright (c) 2001 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * 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.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    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/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <string.h>
#include "cryptlib.h"
#include <openssl/e_os2.h>
#include <openssl/buffer.h>
#include <openssl/ui.h>
#include <openssl/err.h>
#include "ui_locl.h"

IMPLEMENT_STACK_OF(UI_STRING_ST)

static const UI_METHOD *default_UI_meth=NULL;

UI *UI_new(void)
	{
	return(UI_new_method(NULL));
	}

UI *UI_new_method(const UI_METHOD *method)
	{
	UI *ret;

	ret=(UI *)OPENSSL_malloc(sizeof(UI));
	if (ret == NULL)
		{
		UIerr(UI_F_UI_NEW_METHOD,ERR_R_MALLOC_FAILURE);
		return NULL;
		}
	if (method == NULL)
		ret->meth=UI_get_default_method();
	else
		ret->meth=method;

	ret->strings=NULL;
	ret->user_data=NULL;
	ret->flags=0;
	CRYPTO_new_ex_data(CRYPTO_EX_INDEX_UI, ret, &ret->ex_data);
	return ret;
	}

static void free_string(UI_STRING *uis)
	{
	if (uis->flags & OUT_STRING_FREEABLE)
		{
		OPENSSL_free((char *)uis->out_string);
		switch(uis->type)
			{
		case UIT_BOOLEAN:
			OPENSSL_free((char *)uis->_.boolean_data.action_desc);
			OPENSSL_free((char *)uis->_.boolean_data.ok_chars);
			OPENSSL_free((char *)uis->_.boolean_data.cancel_chars);
			break;
		default:
			break;
			}
		}
	OPENSSL_free(uis);
	}

void UI_free(UI *ui)
	{
	if (ui == NULL)
		return;
	sk_UI_STRING_pop_free(ui->strings,free_string);
	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_UI, ui, &ui->ex_data);
	OPENSSL_free(ui);
	}

static int allocate_string_stack(UI *ui)
	{
	if (ui->strings == NULL)
		{
		ui->strings=sk_UI_STRING_new_null();
		if (ui->strings == NULL)
			{
			return -1;
			}
		}
	return 0;
	}

static UI_STRING *general_allocate_prompt(UI *ui, const char *prompt,
	int prompt_freeable, enum UI_string_types type, int input_flags,
	char *result_buf)
	{
	UI_STRING *ret = NULL;

	if (prompt == NULL)
		{
		UIerr(UI_F_GENERAL_ALLOCATE_PROMPT,ERR_R_PASSED_NULL_PARAMETER);
		}
	else if ((type == UIT_PROMPT || type == UIT_VERIFY
			 || type == UIT_BOOLEAN) && result_buf == NULL)
		{
		UIerr(UI_F_GENERAL_ALLOCATE_PROMPT,UI_R_NO_RESULT_BUFFER);
		}
	else if ((ret = (UI_STRING *)OPENSSL_malloc(sizeof(UI_STRING))))
		{
		ret->out_string=prompt;
		ret->flags=prompt_freeable ? OUT_STRING_FREEABLE : 0;
		ret->input_flags=input_flags;
		ret->type=type;
		ret->result_buf=result_buf;
		}
	return ret;
	}

static int general_allocate_string(UI *ui, const char *prompt,
	int prompt_freeable, enum UI_string_types type, int input_flags,
	char *result_buf, int minsize, int maxsize, const char *test_buf)
	{
	int ret = -1;
	UI_STRING *s = general_allocate_prompt(ui, prompt, prompt_freeable,
		type, input_flags, result_buf);

	if (s)
		{
		if (allocate_string_stack(ui) >= 0)
			{
			s->_.string_data.result_minsize=minsize;
			s->_.string_data.result_maxsize=maxsize;
			s->_.string_data.test_buf=test_buf;
			ret=sk_UI_STRING_push(ui->strings, s);
			/* sk_push() returns 0 on error.  Let's addapt that */
			if (ret <= 0) ret--;
			}
		else
			free_string(s);
		}
	return ret;
	}

static int general_allocate_boolean(UI *ui,
	const char *prompt, const char *action_desc,
	const char *ok_chars, const char *cancel_chars,
	int prompt_freeable, enum UI_string_types type, int input_flags,
	char *result_buf)
	{
	int ret = -1;
	UI_STRING *s;
	const char *p;

	if (ok_chars == NULL)
		{
		UIerr(UI_F_GENERAL_ALLOCATE_BOOLEAN,ERR_R_PASSED_NULL_PARAMETER);
		}
	else if (cancel_chars == NULL)
		{
		UIerr(UI_F_GENERAL_ALLOCATE_BOOLEAN,ERR_R_PASSED_NULL_PARAMETER);
		}
	else
		{
		for(p = ok_chars; *p; p++)
			{
			if (strchr(cancel_chars, *p))
				{
				UIerr(UI_F_GENERAL_ALLOCATE_BOOLEAN,
					UI_R_COMMON_OK_AND_CANCEL_CHARACTERS);
				}
			}

		s = general_allocate_prompt(ui, prompt, prompt_freeable,
			type, input_flags, result_buf);

		if (s)
			{
			if (allocate_string_stack(ui) >= 0)
				{
				s->_.boolean_data.action_desc = action_desc;
				s->_.boolean_data.ok_chars = ok_chars;
				s->_.boolean_data.cancel_chars = cancel_chars;
				ret=sk_UI_STRING_push(ui->strings, s);
				/* sk_push() returns 0 on error.
				   Let's addapt that */
				if (ret <= 0) ret--;
				}
			else
				free_string(s);
			}
		}
	return ret;
	}

/* Returns the index to the place in the stack or -1 for error.  Uses a
   direct reference to the prompt.  */
int UI_add_input_string(UI *ui, const char *prompt, int flags,
	char *result_buf, int minsize, int maxsize)
	{
	return general_allocate_string(ui, prompt, 0,
		UIT_PROMPT, flags, result_buf, minsize, maxsize, NULL);
	}

/* Same as UI_add_input_string(), excepts it takes a copy of the prompt */
int UI_dup_input_string(UI *ui, const char *prompt, int flags,
	char *result_buf, int minsize, int maxsize)
	{
	char *prompt_copy=NULL;

	if (prompt)
		{
		prompt_copy=BUF_strdup(prompt);
		if (prompt_copy == NULL)
			{
			UIerr(UI_F_UI_DUP_INPUT_STRING,ERR_R_MALLOC_FAILURE);
			return 0;
			}
		}

	return general_allocate_string(ui, prompt_copy, 1,
		UIT_PROMPT, flags, result_buf, minsize, maxsize, NULL);
	}

int UI_add_verify_string(UI *ui, const char *prompt, int flags,
	char *result_buf, int minsize, int maxsize, const char *test_buf)
	{
	return general_allocate_string(ui, prompt, 0,
		UIT_VERIFY, flags, result_buf, minsize, maxsize, test_buf);
	}

int UI_dup_verify_string(UI *ui, const char *prompt, int flags,
	char *result_buf, int minsize, int maxsize, const char *test_buf)
	{
	char *prompt_copy=NULL;

	if (prompt)
		{
		prompt_copy=BUF_strdup(prompt);
		if (prompt_copy == NULL)
			{
			UIerr(UI_F_UI_DUP_VERIFY_STRING,ERR_R_MALLOC_FAILURE);
			return -1;
			}
		}

	return general_allocate_string(ui, prompt_copy, 1,
		UIT_VERIFY, flags, result_buf, minsize, maxsize, test_buf);
	}

int UI_add_input_boolean(UI *ui, const char *prompt, const char *action_desc,
	const char *ok_chars, const char *cancel_chars,
	int flags, char *result_buf)
	{
	return general_allocate_boolean(ui, prompt, action_desc,
		ok_chars, cancel_chars, 0, UIT_BOOLEAN, flags, result_buf);
	}

int UI_dup_input_boolean(UI *ui, const char *prompt, const char *action_desc,
	const char *ok_chars, const char *cancel_chars,
	int flags, char *result_buf)
	{
	char *prompt_copy = NULL;
	char *action_desc_copy = NULL;
	char *ok_chars_copy = NULL;
	char *cancel_chars_copy = NULL;

	if (prompt)
		{
		prompt_copy=BUF_strdup(prompt);
		if (prompt_copy == NULL)
			{
			UIerr(UI_F_UI_DUP_INPUT_BOOLEAN,ERR_R_MALLOC_FAILURE);
			goto err;
			}
		}

	if (action_desc)
		{
		action_desc_copy=BUF_strdup(action_desc);
		if (action_desc_copy == NULL)
			{
			UIerr(UI_F_UI_DUP_INPUT_BOOLEAN,ERR_R_MALLOC_FAILURE);
			goto err;
			}
		}

	if (ok_chars)
		{
		ok_chars_copy=BUF_strdup(ok_chars);
		if (ok_chars_copy == NULL)
			{
			UIerr(UI_F_UI_DUP_INPUT_BOOLEAN,ERR_R_MALLOC_FAILURE);
			goto err;
			}
		}

	if (cancel_chars)
		{
		cancel_chars_copy=BUF_strdup(cancel_chars);
		if (cancel_chars_copy == NULL)
			{
			UIerr(UI_F_UI_DUP_INPUT_BOOLEAN,ERR_R_MALLOC_FAILURE);
			goto err;
			}
		}

	return general_allocate_boolean(ui, prompt_copy, action_desc_copy,
		ok_chars_copy, cancel_chars_copy, 1, UIT_BOOLEAN, flags,
		result_buf);
 err:
	if (prompt_copy) OPENSSL_free(prompt_copy);
	if (action_desc_copy) OPENSSL_free(action_desc_copy);
	if (ok_chars_copy) OPENSSL_free(ok_chars_copy);
	if (cancel_chars_copy) OPENSSL_free(cancel_chars_copy);
	return -1;
	}

int UI_add_info_string(UI *ui, const char *text)
	{
	return general_allocate_string(ui, text, 0, UIT_INFO, 0, NULL, 0, 0,
		NULL);
	}

int UI_dup_info_string(UI *ui, const char *text)
	{
	char *text_copy=NULL;

	if (text)
		{
		text_copy=BUF_strdup(text);
		if (text_copy == NULL)
			{
			UIerr(UI_F_UI_DUP_INFO_STRING,ERR_R_MALLOC_FAILURE);
			return -1;
			}
		}

	return general_allocate_string(ui, text_copy, 1, UIT_INFO, 0, NULL,
		0, 0, NULL);
	}

int UI_add_error_string(UI *ui, const char *text)
	{
	return general_allocate_string(ui, text, 0, UIT_ERROR, 0, NULL, 0, 0,
		NULL);
	}

int UI_dup_error_string(UI *ui, const char *text)
	{
	char *text_copy=NULL;

	if (text)
		{
		text_copy=BUF_strdup(text);
		if (text_copy == NULL)
			{
			UIerr(UI_F_UI_DUP_ERROR_STRING,ERR_R_MALLOC_FAILURE);
			return -1;
			}
		}
	return general_allocate_string(ui, text_copy, 1, UIT_ERROR, 0, NULL,
		0, 0, NULL);
	}

char *UI_construct_prompt(UI *ui, const char *object_desc,
	const char *object_name)
	{
	char *prompt = NULL;

	if (ui->meth->ui_construct_prompt)
		prompt = ui->meth->ui_construct_prompt(ui,
			object_desc, object_name);
	else
		{
		char prompt1[] = "Enter ";
		char prompt2[] = " for ";
		char prompt3[] = ":";
		int len = 0;

		if (object_desc == NULL)
			return NULL;
		len = sizeof(prompt1) - 1 + strlen(object_desc);
		if (object_name)
			len += sizeof(prompt2) - 1 + strlen(object_name);
		len += sizeof(prompt3) - 1;

		prompt = (char *)OPENSSL_malloc(len + 1);
		BUF_strlcpy(prompt, prompt1, len + 1);
		BUF_strlcat(prompt, object_desc, len + 1);
		if (object_name)
			{
			BUF_strlcat(prompt, prompt2, len + 1);
			BUF_strlcat(prompt, object_name, len + 1);
			}
		BUF_strlcat(prompt, prompt3, len + 1);
		}
	return prompt;
	}

void *UI_add_user_data(UI *ui, void *user_data)
	{
	void *old_data = ui->user_data;
	ui->user_data = user_data;
	return old_data;
	}

void *UI_get0_user_data(UI *ui)
	{
	return ui->user_data;
	}

const char *UI_get0_result(UI *ui, int i)
	{
	if (i < 0)
		{
		UIerr(UI_F_UI_GET0_RESULT,UI_R_INDEX_TOO_SMALL);
		return NULL;
		}
	if (i >= sk_UI_STRING_num(ui->strings))
		{
		UIerr(UI_F_UI_GET0_RESULT,UI_R_INDEX_TOO_LARGE);
		return NULL;
		}
	return UI_get0_result_string(sk_UI_STRING_value(ui->strings, i));
	}

static int print_error(const char *str, size_t len, UI *ui)
	{
	UI_STRING uis;

	memset(&uis, 0, sizeof(uis));
	uis.type = UIT_ERROR;
	uis.out_string = str;

	if (ui->meth->ui_write_string
		&& !ui->meth->ui_write_string(ui, &uis))
		return -1;
	return 0;
	}

int UI_process(UI *ui)
	{
	int i, ok=0;

	if (ui->meth->ui_open_session && !ui->meth->ui_open_session(ui))
		return -1;

	if (ui->flags & UI_FLAG_PRINT_ERRORS)
		ERR_print_errors_cb(
			(int (*)(const char *, size_t, void *))print_error,
			(void *)ui);

	for(i=0; i<sk_UI_STRING_num(ui->strings); i++)
		{
		if (ui->meth->ui_write_string
			&& !ui->meth->ui_write_string(ui,
				sk_UI_STRING_value(ui->strings, i)))
			{
			ok=-1;
			goto err;
			}
		}

	if (ui->meth->ui_flush)
		switch(ui->meth->ui_flush(ui))
			{
		case -1: /* Interrupt/Cancel/something... */
			ok = -2;
			goto err;
		case 0: /* Errors */
			ok = -1;
			goto err;
		default: /* Success */
			ok = 0;
			break;
			}

	for(i=0; i<sk_UI_STRING_num(ui->strings); i++)
		{
		if (ui->meth->ui_read_string)
			{
			switch(ui->meth->ui_read_string(ui,
				sk_UI_STRING_value(ui->strings, i)))
				{
			case -1: /* Interrupt/Cancel/something... */
				ok = -2;
				goto err;
			case 0: /* Errors */
				ok = -1;
				goto err;
			default: /* Success */
				ok = 0;
				break;
				}
			}
		}
 err:
	if (ui->meth->ui_close_session && !ui->meth->ui_close_session(ui))
		return -1;
	return ok;
	}

int UI_ctrl(UI *ui, int cmd, long i, void *p, void (*f)(void))
	{
	if (ui == NULL)
		{
		UIerr(UI_F_UI_CTRL,ERR_R_PASSED_NULL_PARAMETER);
		return -1;
		}
	switch(cmd)
		{
	case UI_CTRL_PRINT_ERRORS:
		{
		int save_flag = !!(ui->flags & UI_FLAG_PRINT_ERRORS);
		if (i)
			ui->flags |= UI_FLAG_PRINT_ERRORS;
		else
			ui->flags &= ~UI_FLAG_PRINT_ERRORS;
		return save_flag;
		}
	case UI_CTRL_IS_REDOABLE:
		return !!(ui->flags & UI_FLAG_REDOABLE);
	default:
		break;
		}
	UIerr(UI_F_UI_CTRL,UI_R_UNKNOWN_CONTROL_COMMAND);
	return -1;
	}

int UI_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
	     CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
        {
	return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_UI, argl, argp,
				new_func, dup_func, free_func);
        }

int UI_set_ex_data(UI *r, int idx, void *arg)
	{
	return(CRYPTO_set_ex_data(&r->ex_data,idx,arg));
	}

void *UI_get_ex_data(UI *r, int idx)
	{
	return(CRYPTO_get_ex_data(&r->ex_data,idx));
	}

void UI_set_default_method(const UI_METHOD *meth)
	{
	default_UI_meth=meth;
	}

const UI_METHOD *UI_get_default_method(void)
	{
	if (default_UI_meth == NULL)
		{
		default_UI_meth=UI_OpenSSL();
		}
	return default_UI_meth;
	}

const UI_METHOD *UI_get_method(UI *ui)
	{
	return ui->meth;
	}

const UI_METHOD *UI_set_method(UI *ui, const UI_METHOD *meth)
	{
	ui->meth=meth;
	return ui->meth;
	}


UI_METHOD *UI_create_method(char *name)
	{
	UI_METHOD *ui_method = (UI_METHOD *)OPENSSL_malloc(sizeof(UI_METHOD));

	if (ui_method)
		{
		memset(ui_method, 0, sizeof(*ui_method));
		ui_method->name = BUF_strdup(name);
		}
	return ui_method;
	}

/* BIG FSCKING WARNING!!!!  If you use this on a statically allocated method
   (that is, it hasn't been allocated using UI_create_method(), you deserve
   anything Murphy can throw at you and more!  You have been warned. */
void UI_destroy_method(UI_METHOD *ui_method)
	{
	OPENSSL_free(ui_method->name);
	ui_method->name = NULL;
	OPENSSL_free(ui_method);
	}

int UI_method_set_opener(UI_METHOD *method, int (*opener)(UI *ui))
	{
	if (method)
		{
		method->ui_open_session = opener;
		return 0;
		}
	else
		return -1;
	}

int UI_method_set_writer(UI_METHOD *method, int (*writer)(UI *ui, UI_STRING *uis))
	{
	if (method)
		{
		method->ui_write_string = writer;
		return 0;
		}
	else
		return -1;
	}

int UI_method_set_flusher(UI_METHOD *method, int (*flusher)(UI *ui))
	{
	if (method)
		{
		method->ui_flush = flusher;
		return 0;
		}
	else
		return -1;
	}

int UI_method_set_reader(UI_METHOD *method, int (*reader)(UI *ui, UI_STRING *uis))
	{
	if (method)
		{
		method->ui_read_string = reader;
		return 0;
		}
	else
		return -1;
	}

int UI_method_set_closer(UI_METHOD *method, int (*closer)(UI *ui))
	{
	if (method)
		{
		method->ui_close_session = closer;
		return 0;
		}
	else
		return -1;
	}

int UI_method_set_prompt_constructor(UI_METHOD *method, char *(*prompt_constructor)(UI* ui, const char* object_desc, const char* object_name))
	{
	if (method)
		{
		method->ui_construct_prompt = prompt_constructor;
		return 0;
		}
	else
		return -1;
	}

int (*UI_method_get_opener(UI_METHOD *method))(UI*)
	{
	if (method)
		return method->ui_open_session;
	else
		return NULL;
	}

int (*UI_method_get_writer(UI_METHOD *method))(UI*,UI_STRING*)
	{
	if (method)
		return method->ui_write_string;
	else
		return NULL;
	}

int (*UI_method_get_flusher(UI_METHOD *method))(UI*)
	{
	if (method)
		return method->ui_flush;
	else
		return NULL;
	}

int (*UI_method_get_reader(UI_METHOD *method))(UI*,UI_STRING*)
	{
	if (method)
		return method->ui_read_string;
	else
		return NULL;
	}

int (*UI_method_get_closer(UI_METHOD *method))(UI*)
	{
	if (method)
		return method->ui_close_session;
	else
		return NULL;
	}

char* (*UI_method_get_prompt_constructor(UI_METHOD *method))(UI*, const char*, const char*)
	{
	if (method)
		return method->ui_construct_prompt;
	else
		return NULL;
	}

enum UI_string_types UI_get_string_type(UI_STRING *uis)
	{
	if (!uis)
		return UIT_NONE;
	return uis->type;
	}

int UI_get_input_flags(UI_STRING *uis)
	{
	if (!uis)
		return 0;
	return uis->input_flags;
	}

const char *UI_get0_output_string(UI_STRING *uis)
	{
	if (!uis)
		return NULL;
	return uis->out_string;
	}

const char *UI_get0_action_string(UI_STRING *uis)
	{
	if (!uis)
		return NULL;
	switch(uis->type)
		{
	case UIT_PROMPT:
	case UIT_BOOLEAN:
		return uis->_.boolean_data.action_desc;
	default:
		return NULL;
		}
	}

const char *UI_get0_result_string(UI_STRING *uis)
	{
	if (!uis)
		return NULL;
	switch(uis->type)
		{
	case UIT_PROMPT:
	case UIT_VERIFY:
		return uis->result_buf;
	default:
		return NULL;
		}
	}

const char *UI_get0_test_string(UI_STRING *uis)
	{
	if (!uis)
		return NULL;
	switch(uis->type)
		{
	case UIT_VERIFY:
		return uis->_.string_data.test_buf;
	default:
		return NULL;
		}
	}

int UI_get_result_minsize(UI_STRING *uis)
	{
	if (!uis)
		return -1;
	switch(uis->type)
		{
	case UIT_PROMPT:
	case UIT_VERIFY:
		return uis->_.string_data.result_minsize;
	default:
		return -1;
		}
	}

int UI_get_result_maxsize(UI_STRING *uis)
	{
	if (!uis)
		return -1;
	switch(uis->type)
		{
	case UIT_PROMPT:
	case UIT_VERIFY:
		return uis->_.string_data.result_maxsize;
	default:
		return -1;
		}
	}

int UI_set_result(UI *ui, UI_STRING *uis, const char *result)
	{
	int l = strlen(result);

	ui->flags &= ~UI_FLAG_REDOABLE;

	if (!uis)
		return -1;
	switch (uis->type)
		{
	case UIT_PROMPT:
	case UIT_VERIFY:
		{
		char number1[DECIMAL_SIZE(uis->_.string_data.result_minsize)+1];
		char number2[DECIMAL_SIZE(uis->_.string_data.result_maxsize)+1];

		BIO_snprintf(number1, sizeof(number1), "%d",
			uis->_.string_data.result_minsize);
		BIO_snprintf(number2, sizeof(number2), "%d",
			uis->_.string_data.result_maxsize);

		if (l < uis->_.string_data.result_minsize)
			{
			ui->flags |= UI_FLAG_REDOABLE;
			UIerr(UI_F_UI_SET_RESULT,UI_R_RESULT_TOO_SMALL);
			ERR_add_error_data(5,"You must type in ",
				number1," to ",number2," characters");
			return -1;
			}
		if (l > uis->_.string_data.result_maxsize)
			{
			ui->flags |= UI_FLAG_REDOABLE;
			UIerr(UI_F_UI_SET_RESULT,UI_R_RESULT_TOO_LARGE);
			ERR_add_error_data(5,"You must type in ",
				number1," to ",number2," characters");
			return -1;
			}
		}

		if (!uis->result_buf)
			{
			UIerr(UI_F_UI_SET_RESULT,UI_R_NO_RESULT_BUFFER);
			return -1;
			}

		BUF_strlcpy(uis->result_buf, result,
			    uis->_.string_data.result_maxsize + 1);
		break;
	case UIT_BOOLEAN:
		{
		const char *p;

		if (!uis->result_buf)
			{
			UIerr(UI_F_UI_SET_RESULT,UI_R_NO_RESULT_BUFFER);
			return -1;
			}

		uis->result_buf[0] = '\0';
		for(p = result; *p; p++)
			{
			if (strchr(uis->_.boolean_data.ok_chars, *p))
				{
				uis->result_buf[0] =
					uis->_.boolean_data.ok_chars[0];
				break;
				}
			if (strchr(uis->_.boolean_data.cancel_chars, *p))
				{
				uis->result_buf[0] =
					uis->_.boolean_data.cancel_chars[0];
				break;
				}
			}
		}
	default:
		break;
		}
	return 0;
	}