97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
/*
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* Copyright (C) 2006 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/console.h>
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#include <ipxe/process.h>
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#include <ipxe/keys.h>
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#include <ipxe/timer.h>
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#include <ipxe/nap.h>
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/** @file
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*
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* Special key interpretation
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*
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*/
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#define GETKEY_TIMEOUT ( TICKS_PER_SEC / 4 )
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/**
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* Read character from console if available within timeout period
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*
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* @v timeout Timeout period, in ticks (0=indefinite)
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* @ret character Character read from console
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*/
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static int getchar_timeout ( unsigned long timeout ) {
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unsigned long start = currticks();
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while ( ( timeout == 0 ) || ( ( currticks() - start ) < timeout ) ) {
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step();
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if ( iskey() )
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return getchar();
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cpu_nap();
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}
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return -1;
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}
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/**
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* Get single keypress
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*
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* @v timeout Timeout period, in ticks (0=indefinite)
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* @ret key Key pressed
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*
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* The returned key will be an ASCII value or a KEY_XXX special
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* constant. This function differs from getchar() in that getchar()
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* will return "special" keys (e.g. cursor keys) as a series of
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* characters forming an ANSI escape sequence.
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*/
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int getkey ( unsigned long timeout ) {
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int character;
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unsigned int n = 0;
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character = getchar_timeout ( timeout );
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if ( character != ESC )
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return character;
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character = getchar_timeout ( GETKEY_TIMEOUT );
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if ( character < 0 )
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return ESC;
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if ( isalpha ( character ) )
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return ( toupper ( character ) - 'A' + 1 );
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while ( ( character = getchar_timeout ( GETKEY_TIMEOUT ) ) >= 0 ) {
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if ( isdigit ( character ) ) {
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n = ( ( n * 10 ) + ( character - '0' ) );
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continue;
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}
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if ( character >= 0x40 )
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return KEY_ANSI ( n, character );
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}
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return ESC;
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}
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