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Below is the full text to rnd.c from the source code of NetHack 2.2a. To link to a particular line, write [[NetHack 2.2a/rnd.c#line123]], for example.

Warning! This is the source code from an old release. For the latest release, see Source code

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1.    /*	SCCS Id: @(#)rnd.c	2.0	87/09/15
2.     */
3.    #include	"config.h"
4.    #ifdef UNIX
5.    #define RND(x)	(random() % (x))
6.    #else
7.    /* Good luck: the bottom order bits are cyclic. */
8.    #define RND(x)	((rand()>>3) % (x))
9.    #endif
10.   
11.   rn1(x,y)	/* y <= rn1(x,y) < (y+x) */ 
12.   register x,y;
13.   {
14.   	return(RND(x)+y);
15.   }
16.   
17.   rn2(x)		/* 0 <= rn2(x) < x */
18.   register x;
19.   {
20.   	return(RND(x));
21.   }
22.   
23.   rnd(x)		/* 1 <= rnd(x) <= x */
24.   register x;
25.   {
26.   	return(RND(x)+1);
27.   }
28.   
29.   d(n,x)		/* n <= d(n,x) <= (n*x) */
30.   register n,x;
31.   {
32.   	register tmp = n;
33.   
34.   	while(n--) tmp += RND(x);
35.   	return(tmp);
36.   }
37.   
38.   rne(x)          /* by stewr 870807 */
39.   register x;
40.   {
41.           register tmp = 1;
42.   	while(!rn2(x)) tmp++;
43.   	return(tmp);
44.   }
45.   
46.   rnz(x)
47.   register x;
48.   {
49.           register tmp = 1000;
50.   	tmp += rn2(1000);
51.   	tmp *= rne(4);
52.   	if (rn2(2)) { x *= tmp; x /= 1000; }
53.   	else { x *= 1000; x /= tmp; }
54.   	return(x);
55.   }

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