[src/trunk]: src/games/cgram cgram: replace comments with code

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/0e41b7e1fd93
branches:  trunk
changeset: 374714:0e41b7e1fd93
user:      rillig <rillig%NetBSD.org@localhost>
date:      Wed May 10 12:30:27 2023 +0000

description:
cgram: replace comments with code

No binary change.

diffstat:

 games/cgram/cgram.c |  19 ++++++++++---------
 1 files changed, 10 insertions(+), 9 deletions(-)

diffs (63 lines):

diff -r ff3c71796438 -r 0e41b7e1fd93 games/cgram/cgram.c
--- a/games/cgram/cgram.c       Wed May 10 12:23:42 2023 +0000
+++ b/games/cgram/cgram.c       Wed May 10 12:30:27 2023 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: cgram.c,v 1.29 2022/06/12 14:59:44 rillig Exp $ */
+/* $NetBSD: cgram.c,v 1.30 2023/05/10 12:30:27 rillig Exp $ */
 
 /*-
  * Copyright (c) 2013, 2021 The NetBSD Foundation, Inc.
@@ -31,7 +31,7 @@
 
 #include <sys/cdefs.h>
 #if defined(__RCSID) && !defined(lint)
-__RCSID("$NetBSD: cgram.c,v 1.29 2022/06/12 14:59:44 rillig Exp $");
+__RCSID("$NetBSD: cgram.c,v 1.30 2023/05/10 12:30:27 rillig Exp $");
 #endif
 
 #include <assert.h>
@@ -488,21 +488,22 @@ handle_key(void)
 {
        int ch = getch();
 
+#define CTRL(letter) (letter - 64)
        switch (ch) {
-       case 1:                 /* ^A */
+       case CTRL('A'):
        case KEY_BEG:
        case KEY_HOME:
                cursor_x = 0;
                break;
-       case 2:                 /* ^B */
+       case CTRL('B'):
        case KEY_LEFT:
                go_left();
                break;
-       case 5:                 /* ^E */
+       case CTRL('E'):
        case KEY_END:
                cursor_x = cur_max_x();
                break;
-       case 6:                 /* ^F */
+       case CTRL('F'):
        case KEY_RIGHT:
                go_right();
                break;
@@ -515,14 +516,14 @@ handle_key(void)
        case '\n':
                go_to_next_line();
                break;
-       case 12:                /* ^L */
+       case CTRL('L'):
                clear();
                break;
-       case 14:                /* ^N */
+       case CTRL('N'):
        case KEY_DOWN:
                cursor_y++;
                break;
-       case 16:                /* ^P */
+       case CTRL('P'):
        case KEY_UP:
                cursor_y--;
                break;