ref: db6883559fb0f243f94d0a2dfab75f866e651652
dir: /sys/src/games/doom/m_cheat.c/
// 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; }