The DOOM sources as originally released on December 23, 1997

linuxdoom-1.10/m_cheat.c

@@ -0,0 +1,101 @@
+// 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;
+
+}
+
+