| /* |
| * Copyright 2012 Google Inc. |
| * |
| * See file CREDITS for list of people who contributed to this |
| * project. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but without any warranty; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| */ |
| |
| #include <libpayload.h> |
| #include <vboot_api.h> |
| |
| #define CSI_0 0x1B |
| #define CSI_1 0x5B |
| |
| #define KEY_DOWN 0402 |
| #define KEY_UP 0403 |
| #define KEY_LEFT 0404 |
| #define KEY_RIGHT 0405 |
| |
| uint32_t VbExKeyboardRead(void) |
| { |
| // No input, just give up. |
| if (!havechar()) |
| return 0; |
| |
| uint32_t ch = getchar(); |
| switch (ch) { |
| case '\n': return '\r'; |
| case KEY_UP: return VB_KEY_UP; |
| case KEY_DOWN: return VB_KEY_DOWN; |
| case KEY_RIGHT: return VB_KEY_RIGHT; |
| case KEY_LEFT: return VB_KEY_LEFT; |
| case CSI_0: |
| // Ignore non escape [ sequences. |
| if (getchar() != CSI_1) |
| return CSI_0; |
| |
| // Translate the arrow keys, and ignore everything else. |
| switch (getchar()) { |
| case 'A': return VB_KEY_UP; |
| case 'B': return VB_KEY_DOWN; |
| case 'C': return VB_KEY_RIGHT; |
| case 'D': return VB_KEY_LEFT; |
| default: return 0; |
| } |
| default: |
| return ch; |
| } |
| } |
| |
| uint32_t VbExKeyboardReadWithFlags(uint32_t *flags_ptr) |
| { |
| uint32_t c = VbExKeyboardRead(); |
| if (flags_ptr) { |
| *flags_ptr = 0; |
| // USB keyboards definitely cannot be trusted (assuming they |
| // are even keyboards). There are other devices that also |
| // cannot be trusted, but this is the best we can do for now. |
| if (last_key_input_type() != CONSOLE_INPUT_TYPE_USB) |
| *flags_ptr |= VB_KEY_FLAG_TRUSTED_KEYBOARD; |
| } |
| return c; |
| } |