doom

a minimalistic implementation of doom
git clone git://ssnf.xyz/doom
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m_cheat.c (877B)

      1 #include "m_cheat.h"
      2 
      3 
      4 
      5 
      6 
      7 static int		firsttime = 1;
      8 static unsigned char	cheat_xlate_table[256];
      9 
     10 
     11 
     12 
     13 
     14 
     15 int
     16 cht_CheckCheat
     17 ( cheatseq_t*	cht,
     18   char		key )
     19 {
     20     int i;
     21     int rc = 0;
     22 
     23     if (firsttime)
     24     {
     25 	firsttime = 0;
     26 	for (i=0;i<256;i++) cheat_xlate_table[i] = SCRAMBLE(i);
     27     }
     28 
     29     if (!cht->p)
     30 	cht->p = cht->sequence; 
     31 
     32     if (*cht->p == 0)
     33 	*(cht->p++) = key;
     34     else if
     35 	(cheat_xlate_table[(unsigned char)key] == *cht->p) cht->p++;
     36     else
     37 	cht->p = cht->sequence;
     38 
     39     if (*cht->p == 1)
     40 	cht->p++;
     41     else if (*cht->p == 0xff) 
     42     {
     43 	cht->p = cht->sequence;
     44 	rc = 1;
     45     }
     46 
     47     return rc;
     48 }
     49 
     50 void
     51 cht_GetParam
     52 ( cheatseq_t*	cht,
     53   char*		buffer )
     54 {
     55 
     56     unsigned char *p, c;
     57 
     58     p = cht->sequence;
     59     while (*(p++) != 1);
     60     
     61     do
     62     {
     63 	c = *p;
     64 	*(buffer++) = c;
     65 	*(p++) = 0;
     66     }
     67     while (c && *p!=0xff );
     68 
     69     if (*p==0xff)
     70 	*buffer = 0;
     71 
     72 }
     73 
     74