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https://github.com/ipxe/ipxe
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e1cedbc0d4
Several keyboard layouts define ASCII characters as accessible only via the AltGr modifier. Add support for this modifier to ensure that all ASCII characters are accessible. Experiments suggest that the BIOS console is likely to fail to generate ASCII characters when the AltGr key is pressed. Work around this limitation by accepting LShift+RShift (which will definitely produce an ASCII character) as a synonym for AltGr. Signed-off-by: Michael Brown <mcb30@ipxe.org>
94 lines
2.4 KiB
C
94 lines
2.4 KiB
C
/*
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* Copyright (C) 2022 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <ctype.h>
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#include <ipxe/keys.h>
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#include <ipxe/keymap.h>
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/** @file
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*
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* Keyboard mappings
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*
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*/
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/** ASCII character mask */
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#define ASCII_MASK 0x7f
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/** Control character mask */
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#define CTRL_MASK 0x1f
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/** Upper case character mask */
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#define UPPER_MASK 0x5f
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/** Case toggle bit */
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#define CASE_TOGGLE ( ASCII_MASK & ~UPPER_MASK )
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/** Default keyboard mapping */
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static TABLE_START ( keymap_start, KEYMAP );
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/** Current keyboard mapping */
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static struct keymap *keymap = keymap_start;
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/**
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* Remap a key
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*
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* @v character Character read from console
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* @ret mapped Mapped character
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*/
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unsigned int key_remap ( unsigned int character ) {
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unsigned int mapped = ( character & KEYMAP_MASK );
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struct keymap_key *key;
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/* Invert case before remapping if applicable */
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if ( ( character & KEYMAP_CAPSLOCK_UNDO ) && isalpha ( mapped ) )
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mapped ^= CASE_TOGGLE;
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/* Select remapping table */
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key = ( ( character & KEYMAP_ALTGR ) ? keymap->altgr : keymap->basic );
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/* Remap via table */
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for ( ; key->from ; key++ ) {
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if ( mapped == key->from ) {
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mapped = key->to;
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break;
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}
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}
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/* Handle Ctrl-<key> and CapsLock */
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if ( isalpha ( mapped ) ) {
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if ( character & KEYMAP_CTRL ) {
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mapped &= CTRL_MASK;
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} else if ( character & KEYMAP_CAPSLOCK ) {
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mapped ^= CASE_TOGGLE;
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}
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}
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/* Clear flags */
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mapped &= ASCII_MASK;
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DBGC2 ( &keymap, "KEYMAP mapped %04x => %02x\n", character, mapped );
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return mapped;
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}
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