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MAPKEY.C
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1980-01-05
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/*
* Copyright (c) 1987, 1988, 1989 Stanford University
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided
* that the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of Stanford not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. Stanford makes no representations about
* the suitability of this software for any purpose. It is provided "as is"
* without express or implied warranty.
*
* STANFORD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
* IN NO EVENT SHALL STANFORD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
// $Header: mapkey.c,v 1.7 89/10/09 14:49:03 linton Exp $
// implements class MapKey.
#include "mapkey.h"
#include <ctype.h>
#include <stdio.h>
// MapKey clears MapKey's array to all nils.
MapKey::MapKey () {
for (int i = 0; i <= MAXCHAR; i++) {
array[i] = nil;
}
}
// Enter enters an Interactor into a slot in MapKey's array. If the
// slot doesn't exist or another Interactor already occupies it,
// Enter prints a warning message.
void MapKey::Enter (Interactor* i, char c) {
if (c >= 0 && c <= MAXCHAR) {
if (array[c] == nil) {
array[c] = i;
} else {
fprintf(stderr, "MapKey: slot %d already occupied!\n", c);
}
} else {
fprintf(stderr, "MapKey: slot %d not in array!\n", c);
}
}
// LookUp returns the Interactor associated with the given character
// or nil if there's no Interactor or the character's out of bounds.
Interactor* MapKey::LookUp (char c) {
if (c >= 0 && c <= MAXCHAR) {
return array[c];
} else {
fprintf(stderr, "MapKey: slot %d not in array!\n", c);
return nil;
}
}
// ToStr returns a printable string representing the given character.
// The caller must copy the returned string because the next call of
// ToStr will change it.
const char* MapKey::ToStr (char c) {
static char key[3];
if (!isprint(c)) {
c = toascii(c + 0100);
key[0] = '^';
} else {
key[0] = ' ';
}
key[1] = c;
key[2] = 0;
return key;
}