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108 lines
3.0 KiB
C++
108 lines
3.0 KiB
C++
/*****************************************************************
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*
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* Keyboard Handling
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*
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* This program shows one way to access the keyboard directly
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* from ORCA/C. Keep in mind that the standard file input
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* collects an entire line of characters before reporting the
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* first character. This is necessary to allow editing of the
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* input line. When using the desktop environment, you can get
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* keypress events from the event manager. This program shows
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* how to detect a keypress as soon as it is hit. It echoes
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* keys until you type CONTROL-@ (ASCII 0).
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*
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* The program works by reading the keyboard (at $C000) until
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* the value is negative, indicating that a key has been
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* pressed. It then stores a value (any value will do) in
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* $C010 to indicate that the key has been read. This makes
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* the value at $C010 positive (bit 7 is clear). The value of
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* the key is then ANDed with $7F to clear the high bit.
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*
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* THIS METHOD OF READING THE KEYBOARD ONLY WORKS IN THE TEXT
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* ENVIRONMENT. When the event manager is active, as it always
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* is in a desktop program, you should call the event manager
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* to read keystrokes.
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*
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* Checking to see when a key has been pressed is bundled into
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* the function KeyPress. Returning the key and clearing the
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* strobe is done in ReadChar.
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*
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* See key2 for a version that splits the keyboard routines off
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* into a separately compilable module.
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*
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* See key3 for a version that uses assembly language to do the
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* same thing.
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*
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* By Mike Westerfield and Barbara Allred
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*
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* Copyright 1987-1989
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* Byte Works, Inc.
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*
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*******************************************************************/
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#pragma keep "Key"
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#pragma lint -1
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#include <stdio.h>
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static char ch; /* character read from keyboard */
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/****************************************************************
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*
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* KeyPress - Check if a key has been pressed
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*
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****************************************************************/
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int KeyPress(void)
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{
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char *keyboard;
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keyboard = (char *) 0x00C000;
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return ((*keyboard) & 0x80) != 0;
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}
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/****************************************************************
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*
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* ReadChar - Return the last character typed on the keyboard.
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* Note: Returns a character whether or not one has
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* been typed!
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*
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****************************************************************/
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char ReadChar (void)
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{
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char *keyboard, *strobe;
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keyboard = (char *) 0x00C000;
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strobe = (char *) 0x00C010;
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*strobe = 0;
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return *keyboard & 0x7F;
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}
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/****************************************************************
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*
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* Main program starts here
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*
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****************************************************************/
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int main(void)
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{
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printf ("Press any key(s) and then RETURN. Enter CTRL-@ to quit.\n");
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do {
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while (! KeyPress()) /* wait for a keypress */
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;
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ch = ReadChar(); /* get character typed from keybrd */
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if (ch == 0x0D) /* write character to the screen */
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printf ("\n");
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else
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printf ("%c", ch);
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}
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while (ch != 0);
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return 0;
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}
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