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- /* Emacs style mode select -*- C++ -*- */
- /* ----------------------------------------------------------------------------- */
- /* */
- /* $Id:$ */
- /* */
- /* Copyright (C) 1993-1996 by id Software, Inc. */
- /* */
- /* This source is available for distribution and/or modification */
- /* only under the terms of the DOOM Source Code License as */
- /* published by id Software. All rights reserved. */
- /* */
- /* The source is distributed in the hope that it will be useful, */
- /* but WITHOUT ANY WARRANTY; without even the implied warranty of */
- /* FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License */
- /* for more details. */
- /* */
- /* $Log:$ */
- /* */
- /* DESCRIPTION: */
- /* Cheat sequence checking. */
- /* */
- /* ----------------------------------------------------------------------------- */
-
-
- static const char
- rcsid[] = "$Id: m_cheat.c,v 1.1 1997/02/03 21:24:34 b1 Exp $";
-
- #include "m_cheat.h"
-
- /* */
- /* CHEAT SEQUENCE PACKAGE */
- /* */
-
- static int firsttime = 1;
- static unsigned char cheat_xlate_table[256];
-
-
- /* */
- /* Called in st_stuff module, which handles the input. */
- /* Returns a 1 if the cheat was successful, 0 if failed. */
- /* */
- int
- cht_CheckCheat
- ( cheatseq_t* cht,
- char key )
- {
- int i;
- int rc = 0;
-
- if (firsttime)
- {
- firsttime = 0;
- for (i=0;i<256;i++) cheat_xlate_table[i] = SCRAMBLE(i);
- }
-
- if (!cht->p)
- cht->p = cht->sequence; /* initialize if first time */
-
- if (*cht->p == 0)
- *(cht->p++) = key;
- else if
- (cheat_xlate_table[(unsigned char)key] == *cht->p) cht->p++;
- else
- cht->p = cht->sequence;
-
- if (*cht->p == 1)
- cht->p++;
- else if (*cht->p == 0xff) /* end of sequence character */
- {
- cht->p = cht->sequence;
- rc = 1;
- }
-
- return rc;
- }
-
- void
- cht_GetParam
- ( cheatseq_t* cht,
- char* buffer )
- {
-
- unsigned char *p, c;
-
- p = cht->sequence;
- while (*(p++) != 1);
-
- do
- {
- c = *p;
- *(buffer++) = c;
- *(p++) = 0;
- }
- while (c && *p!=0xff );
-
- if (*p==0xff)
- *buffer = 0;
-
- }
-
-
-