/* $NetBSD: console.c,v 1.2 2018/09/15 16:44:15 jmcneill Exp $ */

/*-
* Copyright (c) 2018 Jared McNeill <[email protected]>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS 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 REGENTS OR 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.
*/

#include "efiboot.h"

static EFI_INPUT_KEY key_cur;
static int key_pending;

int
getchar(void)
{
       EFI_STATUS status;
       EFI_INPUT_KEY key;

       if (key_pending) {
               key = key_cur;
               key_pending = 0;
       } else {
               status = uefi_call_wrapper(ST->ConIn->ReadKeyStroke, 2, ST->ConIn, &key);
               while (status == EFI_NOT_READY) {
                       if (ST->ConIn->WaitForKey != NULL)
                               WaitForSingleEvent(ST->ConIn->WaitForKey, 0);
                       status = uefi_call_wrapper(ST->ConIn->ReadKeyStroke, 2, ST->ConIn, &key);
               }
       }

       return key.UnicodeChar;
}

void
putchar(int c)
{
       CHAR16 buf[2] = { c, '\0' };
       if (c == '\n')
               putchar('\r');
       uefi_call_wrapper(ST->ConOut->OutputString, 2, ST->ConOut, buf);
}

int
ischar(void)
{
       EFI_INPUT_KEY key;
       EFI_STATUS status;

       if (ST->ConIn->WaitForKey == NULL) {
               if (key_pending)
                       return 1;
               status = uefi_call_wrapper(ST->ConIn->ReadKeyStroke, 2, ST->ConIn, &key);
               if (status == EFI_SUCCESS) {
                       key_cur = key;
                       key_pending = 1;
               }
               return key_pending;
       } else {
               status = uefi_call_wrapper(BS->CheckEvent, 1, ST->ConIn->WaitForKey);
               return status == EFI_SUCCESS;
       }
}