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/* Copyright (c) 1986 Regents of the University of California */ |
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/* Copyright (c) 1999 Silicon Graphics, Inc. */ |
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/* SCCSid "$SunId$ LBL" */ |
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/* SCCSid "$SunId$ SGI" */ |
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/* |
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* random.h - header file for random(3) and urand() function. |
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* 10/1/85 |
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*/ |
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#ifdef BSD |
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#ifdef MSDOS |
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#define random() ((long)rand()<<16^(long)rand()<<6^(long)rand()>>4) |
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#define srandom(s) srand((unsigned)(s)) |
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#define frandom() (rand()*(1./32768.)) |
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#else |
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#ifdef BSD |
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extern long random(); |
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#define frandom() (random()*(1./2147483648.)) |
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#define frandom() (random()*(1./2147483648.)) |
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#else |
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extern long lrand48(); |
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extern double drand48(); |
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#define random() lrand48() |
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#define frandom() drand48() |
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#define random() lrand48() |
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#define srandom(s) srand48((long)(s)) |
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#define frandom() drand48() |
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#endif |
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#endif |
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#define urand(i) ((urperm[(i)&urmask]+frandom())/(urmask+1)) |
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#ifdef MC |
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extern short *urperm; |
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extern int urmask; |
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#define urand(i) frandom() |
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#define initurand(n) (n) |
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#else |
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extern unsigned short *urperm; |
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extern int urmask, initurand(); |
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#define urand(i) ((urperm[(i)&urmask]+frandom())/(urmask+1)) |
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#endif |
