09.01.2012, 17:01
This is how random in PAWN works:
Neat code if you ask me.
pawn Код:
#define INITIAL_SEED 0xcaa938dbL
static unsigned long IL_StandardRandom_seed = INITIAL_SEED; /* always use a non-zero seed */
#define IL_RMULT 1103515245L
static cell AMX_NATIVE_CALL core_random(AMX *amx,const cell *params)
{
unsigned long lo, hi, ll, lh, hh, hl;
unsigned long result;
/* one-time initialization (or, mostly one-time) */
#if !defined SN_TARGET_PS2 && !defined _WIN32_WCE && !defined __ICC430__
if (IL_StandardRandom_seed == INITIAL_SEED)
IL_StandardRandom_seed=(unsigned long)time(NULL);
#endif
(void)amx;
lo = IL_StandardRandom_seed & 0xffff;
hi = IL_StandardRandom_seed >> 16;
IL_StandardRandom_seed = IL_StandardRandom_seed * IL_RMULT + 12345;
ll = lo * (IL_RMULT & 0xffff);
lh = lo * (IL_RMULT >> 16 );
hl = hi * (IL_RMULT & 0xffff);
hh = hi * (IL_RMULT >> 16 );
result = ((ll + 12345) >> 16) + lh + hl + (hh << 16);
result &= ~LONG_MIN; /* remove sign bit */
if (params[1]!=0)
result %= params[1];
return (cell)result;
}

