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      1 /* $NetBSD: console.c,v 1.2 2018/09/15 16:44:15 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2018 Jared McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include "efiboot.h"
     30 
     31 static EFI_INPUT_KEY key_cur;
     32 static int key_pending;
     33 
     34 int
     35 getchar(void)
     36 {
     37 	EFI_STATUS status;
     38 	EFI_INPUT_KEY key;
     39 
     40 	if (key_pending) {
     41 		key = key_cur;
     42 		key_pending = 0;
     43 	} else {
     44 		status = uefi_call_wrapper(ST->ConIn->ReadKeyStroke, 2, ST->ConIn, &key);
     45 		while (status == EFI_NOT_READY) {
     46 			if (ST->ConIn->WaitForKey != NULL)
     47 				WaitForSingleEvent(ST->ConIn->WaitForKey, 0);
     48 			status = uefi_call_wrapper(ST->ConIn->ReadKeyStroke, 2, ST->ConIn, &key);
     49 		}
     50 	}
     51 
     52 	return key.UnicodeChar;
     53 }
     54 
     55 void
     56 putchar(int c)
     57 {
     58 	CHAR16 buf[2] = { c, '\0' };
     59 	if (c == '\n')
     60 		putchar('\r');
     61 	uefi_call_wrapper(ST->ConOut->OutputString, 2, ST->ConOut, buf);
     62 }
     63 
     64 int
     65 ischar(void)
     66 {
     67 	EFI_INPUT_KEY key;
     68 	EFI_STATUS status;
     69 
     70 	if (ST->ConIn->WaitForKey == NULL) {
     71 		if (key_pending)
     72 			return 1;
     73 		status = uefi_call_wrapper(ST->ConIn->ReadKeyStroke, 2, ST->ConIn, &key);
     74 		if (status == EFI_SUCCESS) {
     75 			key_cur = key;
     76 			key_pending = 1;
     77 		}
     78 		return key_pending;
     79 	} else {
     80 		status = uefi_call_wrapper(BS->CheckEvent, 1, ST->ConIn->WaitForKey);
     81 		return status == EFI_SUCCESS;
     82 	}
     83 }
     84