Source:NetHack 3.0.0/rnd.c

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Below is the full text to rnd.c from the source code of NetHack 3.0.0. To link to a particular line, write [[NetHack 3.0.0/rnd.c#line123]], for example.

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1.    /*	SCCS Id: @(#)rnd.c	3.0	87/07/06
2.     */
3.    /* NetHack may be freely redistributed.  See license for details. */
4.    
5.    #include	"hack.h"
6.    
7.    #if defined(LINT) && defined(UNIX)	/* rand() is long... */
8.    extern int rand();
9.    #define RND(x)	(rand() % x)
10.   #else /* LINT */
11.   /* rand() is either random() or lrand48() - see config.h. */
12.   #ifdef UNIX
13.   #define RND(x)	(int)(Rand() % (long)(x))
14.   #else
15.   /* Good luck: the bottom order bits are cyclic. */
16.   #define RND(x)	(int)((Rand()>>3) % (x))
17.   #endif
18.   #endif /* LINT */
19.   
20.   int
21.   rn1(x,y)	/* y <= rn1(x,y) < (y+x) */
22.   register int x, y;
23.   {
24.   	return(RND(x)+y);
25.   }
26.   
27.   int
28.   rn2(x)		/* 0 <= rn2(x) < x */
29.   register int x;
30.   {
31.   	return(RND(x));
32.   }
33.   
34.   int
35.   rnl(x)		/* 0 <= rnl(x) < x; somtimes subtracting Luck */
36.   register x;	/* good luck approaches 0, bad luck approaches (x-1) */
37.   {
38.   	register int i = RND(x);
39.   
40.   	if (Luck && rn2(50 - Luck)) {
41.   	    i -= (x <= 15 && Luck >= -5 ? Luck/3 : Luck);
42.   	    if (i < 0) i = 0;
43.   	    else if (i >= x) i = x-1;
44.   	}
45.   
46.   	return i;
47.   }
48.   
49.   int
50.   rnd(x)		/* 1 <= rnd(x) <= x */
51.   register int x;
52.   {
53.   	return(RND(x)+1);
54.   }
55.   
56.   int
57.   d(n,x)		/* n <= d(n,x) <= (n*x) */
58.   register int n, x;
59.   {
60.   	register int tmp = n;
61.   
62.   	while(n--) tmp += RND(x);
63.   	return(tmp);
64.   }
65.   
66.   int
67.   rne(x)	  /* by stewr 870807 */
68.   register int x;
69.   {
70.   	register int tmp = 1;
71.   	while(!rn2(x)) tmp++;
72.   	return(tmp);
73.   }
74.   
75.   #ifdef THEOLOGY
76.   int
77.   rnz(i)
78.   int i;
79.   {
80.   # ifdef LINT
81.   	int x = i;
82.   	int tmp = 1000;
83.   # else
84.   	register long x = i;
85.   	register long tmp = 1000;
86.   # endif
87.   	tmp += rn2(1000);
88.   	tmp *= rne(4);
89.   	if (rn2(2)) { x *= tmp; x /= 1000; }
90.   	else { x *= 1000; x /= tmp; }
91.   	return((int)x);
92.   }
93.   #endif