mirror of https://github.com/ipxe/ipxe.git
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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