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);
		strcpy(prompt, prompt1);
		strcat(prompt, object_desc);
		if (object_name)
			{
			strcat(prompt, prompt2);
			strcat(prompt, object_name);
			}
		strcat(prompt, prompt3);
		}
	return prompt;
	}