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