Games/Doom/m_cheat.c

   1 // Emacs style mode select   -*- C++ -*-
   2 //-----------------------------------------------------------------------------
   3 //
   4 // $Id$
   5 //
   6 // Copyright (C) 1993-1996 by id Software, Inc.
   7 //
   8 // This source is available for distribution and/or modification
   9 // only under the terms of the DOOM Source Code License as
  10 // published by id Software. All rights reserved.
  11 //
  12 // The source is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
  15 // for more details.
  16 //
  17 // $Log$
  18 // Revision 1.1  2000/02/29 18:21:04  stegerg
  19 // Doom port based on ADoomPPC. Read README.AROS!
  20 //
  21 //
  22 // DESCRIPTION:
  23 //      Cheat sequence checking.
  24 //
  25 //-----------------------------------------------------------------------------
  26
  27
  28 static const char
  29 rcsid[] = "$Id$";
  30
  31 #include "m_cheat.h"
  32
  33 //
  34 // CHEAT SEQUENCE PACKAGE
  35 //
  36
  37 static int              firsttime = 1;
  38 static unsigned char    cheat_xlate_table[256];
  39
  40
  41 //
  42 // Called in st_stuff module, which handles the input.
  43 // Returns a 1 if the cheat was successful, 0 if failed.
  44 //
  45 int
  46 cht_CheckCheat
  47 ( cheatseq_t*   cht,
  48   char          key )
  49 {
  50     int i;
  51     int rc = 0;
  52
  53     if (firsttime)
  54     {
  55         firsttime = 0;
  56         for (i=0;i<256;i++) cheat_xlate_table[i] = SCRAMBLE(i);
  57     }
  58
  59     if (!cht->p)
  60         cht->p = cht->sequence; // initialize if first time
  61
  62     if (*cht->p == 0)
  63         *(cht->p++) = key;
  64     else if
  65         (cheat_xlate_table[(unsigned char)key] == *cht->p) cht->p++;
  66     else
  67         cht->p = cht->sequence;
  68
  69     if (*cht->p == 1)
  70         cht->p++;
  71     else if (*cht->p == 0xff) // end of sequence character
  72     {
  73         cht->p = cht->sequence;
  74         rc = 1;
  75     }
  76
  77     return rc;
  78 }
  79
  80 void
  81 cht_GetParam
  82 ( cheatseq_t*   cht,
  83   char*         buffer )
  84 {
  85
  86     unsigned char *p, c;
  87
  88     p = cht->sequence;
  89     while (*(p++) != 1);
  90
  91     do
  92     {
  93         c = *p;
  94         *(buffer++) = c;
  95         *(p++) = 0;
  96     }
  97     while (c && *p!=0xff );
  98
  99     if (*p==0xff)
 100         *buffer = 0;
 101
 102 }
 103
 104