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65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
/*****************************************************************
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*
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* Keyboard Handling
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*
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* This is the final incarnation of the keyboard polling sample.
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* See KEY.CC for complete comments on what the program does and
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* how it works.
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*
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* In this version, we will write the two subroutines in
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* assembly language. While you could use separate compilation
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* to compile and assemble the two pieces separately, then
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* link them, as in the last example, we will use chaining
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* to avoid all of that. Chaining is a feature of all
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* languages fully installed in ORCA or APW that allows a
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* single program to be written in more than one language
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* without resorting to separate compilation. Which method
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* you prefer - chaining or separate compilation - depends
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* on your own taste.
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*
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* To chain the two files together, we just place an append
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* command after the end of the program. The rest is automatic
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* To compile, assemble, link, and execute, we can now use the
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* familiar RUN command:
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*
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* run key3.cc
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*
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* Note: both the assembler and compiler must be properly
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* installed for this to work. The assembler is sold
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* separately as ORCA/M 2.0 for the Apple IIGS.
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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 "Key3"
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#pragma lint -1
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#include <stdio.h>
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int main (void)
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{
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extern int KEYPRESS (void); /* declare assembly-language */
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extern int READCHAR (void); /* routines to be called */
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char ch; /* character read from keyboard */
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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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#append "Key3.asm"
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