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| Rev | Author | Line No. | Line |
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| 298 | serge | 1 | // Emacs style mode select -*- C++ -*- |
| 2 | //----------------------------------------------------------------------------- |
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| 3 | // |
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| 4 | // $Id:$ |
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| 5 | // |
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| 6 | // Copyright (C) 1993-1996 by id Software, Inc. |
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| 7 | // |
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| 8 | // This source is available for distribution and/or modification |
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| 9 | // only under the terms of the DOOM Source Code License as |
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| 10 | // published by id Software. All rights reserved. |
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| 11 | // |
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| 12 | // The source is distributed in the hope that it will be useful, |
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| 13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | // FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License |
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| 15 | // for more details. |
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| 16 | // |
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| 17 | // $Log:$ |
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| 18 | // |
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| 19 | // DESCRIPTION: |
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| 20 | // Cheat sequence checking. |
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| 21 | // |
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| 22 | //----------------------------------------------------------------------------- |
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| 23 | |||
| 24 | |||
| 25 | static const char |
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| 26 | rcsid[] = "$Id: m_cheat.c,v 1.1 1997/02/03 21:24:34 b1 Exp $"; |
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| 27 | |||
| 28 | #include "m_cheat.h" |
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| 29 | |||
| 30 | // |
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| 31 | // CHEAT SEQUENCE PACKAGE |
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| 32 | // |
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| 33 | |||
| 34 | static int firsttime = 1; |
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| 35 | static unsigned char cheat_xlate_table[256]; |
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| 36 | |||
| 37 | |||
| 38 | // |
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| 39 | // Called in st_stuff module, which handles the input. |
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| 40 | // Returns a 1 if the cheat was successful, 0 if failed. |
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| 41 | // |
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| 42 | int |
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| 43 | cht_CheckCheat |
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| 44 | ( cheatseq_t* cht, |
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| 45 | char key ) |
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| 46 | { |
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| 47 | int i; |
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| 48 | int rc = 0; |
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| 49 | |||
| 50 | if (firsttime) |
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| 51 | { |
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| 52 | firsttime = 0; |
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| 53 | for (i=0;i<256;i++) cheat_xlate_table[i] = SCRAMBLE(i); |
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| 54 | } |
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| 55 | |||
| 56 | if (!cht->p) |
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| 57 | cht->p = cht->sequence; // initialize if first time |
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| 58 | |||
| 59 | if (*cht->p == 0) |
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| 60 | *(cht->p++) = key; |
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| 61 | else if |
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| 62 | (cheat_xlate_table[(unsigned char)key] == *cht->p) cht->p++; |
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| 63 | else |
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| 64 | cht->p = cht->sequence; |
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| 65 | |||
| 66 | if (*cht->p == 1) |
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| 67 | cht->p++; |
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| 68 | else if (*cht->p == 0xff) // end of sequence character |
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| 69 | { |
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| 70 | cht->p = cht->sequence; |
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| 71 | rc = 1; |
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| 72 | } |
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| 73 | |||
| 74 | return rc; |
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| 75 | } |
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| 76 | |||
| 77 | void |
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| 78 | cht_GetParam |
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| 79 | ( cheatseq_t* cht, |
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| 80 | char* buffer ) |
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| 81 | { |
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| 82 | |||
| 83 | unsigned char *p, c; |
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| 84 | |||
| 85 | p = cht->sequence; |
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| 86 | while (*(p++) != 1); |
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| 87 | |||
| 88 | do |
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| 89 | { |
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| 90 | c = *p; |
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| 91 | *(buffer++) = c; |
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| 92 | *(p++) = 0; |
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| 93 | } |
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| 94 | while (c && *p!=0xff ); |
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| 95 | |||
| 96 | if (*p==0xff) |
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| 97 | *buffer = 0; |
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| 98 | |||
| 99 | } |
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| 100 |