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124 lines
2.9 KiB
C++
124 lines
2.9 KiB
C++
/* Copyright (C) 1994-2003 Revolution Software Ltd
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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
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*/
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//=============================================================================
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//
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// Filename : keyboard.c
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// Created : 19th September 1996
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// By : P.R.Porter
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//
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// Summary : This module holds the interface to the keyboard
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//
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// Version Date By Description
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// ------- --------- --- -----------------------------------------------
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// 1.0 19-Sep-96 PRP Keyboard functions. Simple logging of
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// previous 32 keys pressed.
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//
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// 1.1 19-Sep-96 PRP Fixed bug, ReadKey did not return RD_OK.
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//
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// 1.2 13-Aug-97 PSJ Added GetKeyStatus
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//
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// Functions
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// ---------
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//
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// --------------------------------------------------------------------------
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//
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// BOOL KeyWaiting(void)
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//
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// This function returns TRUE if there is an unprocessed key waiting in the
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// queue, FALSE otherwise.
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//
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// --------------------------------------------------------------------------
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//
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// int32 ReadKey(char *key)
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//
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// Sets the value of key passed in to the current waiting key. If there is
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// no key waiting, an error code is returned.
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//
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// --------------------------------------------------------------------------
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//
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// void GetKeyStatus(_drvKeyStatus *s)
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//
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// Retrieves the status of the keyboard handler.
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//
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//=============================================================================
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#include "stdafx.h"
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#include "driver96.h"
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uint8 keyBacklog = 0; // The number of key presses waiting to be processed.
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uint8 keyPointer = 0; // Index of the next key to read from the buffer.
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char keyBuffer[MAX_KEY_BUFFER]; // The keyboard buffer
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void WriteKey(char key)
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{
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if (keyBuffer && keyBacklog < MAX_KEY_BUFFER)
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{
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keyBuffer[(keyPointer + keyBacklog) % MAX_KEY_BUFFER] = key;
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keyBacklog += 1;
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}
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}
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BOOL KeyWaiting(void)
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{
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if (keyBacklog)
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return(TRUE);
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else
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return(FALSE);
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}
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int32 ReadKey(char *key)
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{
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if (!keyBacklog)
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return(RDERR_NOKEYWAITING);
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if (key == NULL)
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return(RDERR_INVALIDPOINTER);
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*key = keyBuffer[keyPointer++];
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if (keyPointer == MAX_KEY_BUFFER)
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keyPointer = 0;
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keyBacklog -= 1;
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return(RD_OK);
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}
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void GetKeyStatus(_drvKeyStatus *s)
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{
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// Flush key buffer
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s->pBacklog = &keyBacklog;
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s->pPointer = &keyPointer;
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s->pBuffer = keyBuffer;
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}
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