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Source:NetHack 3.1.0/rnd.c

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Below is the full text to rnd.c from the source code of NetHack 3.1.0. To link to a particular line, write [[NetHack 3.1.0/rnd.c#line123]], for example.

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

The NetHack General Public License applies to screenshots, source code and other content from NetHack.
1.    /*	SCCS Id: @(#)rnd.c	3.1	90/22/02
2.    /* NetHack may be freely redistributed.  See license for details. */
3.    
4.    #include	"hack.h"
5.    
6.    #if defined(LINT) && defined(UNIX)	/* rand() is long... */
7.    extern int NDECL(rand);
8.    #define RND(x)	(rand() % x)
9.    #else /* LINT */
10.   /* rand() is either random() or lrand48() - see config.h. */
11.   #ifdef UNIX
12.   #define RND(x)	(int)(Rand() % (long)(x))
13.   #else
14.   /* Good luck: the bottom order bits are cyclic. */
15.   #define RND(x)	(int)((Rand()>>3) % (x))
16.   #endif
17.   #endif /* LINT */
18.   
19.   #ifdef OVL0
20.   
21.   int
22.   rn2(x)		/* 0 <= rn2(x) < x */
23.   register int x;
24.   {
25.   #ifdef DEBUG
26.   	if (x == 0) {
27.   		impossible("rn2(0) attempted");
28.   		return(0);
29.   	}
30.   #endif
31.   	return(RND(x));
32.   }
33.   
34.   #endif /* OVL0 */
35.   #ifdef OVLB
36.   
37.   int
38.   rnl(x)		/* 0 <= rnl(x) < x; sometimes subtracting Luck */
39.   register int x;	/* good luck approaches 0, bad luck approaches (x-1) */
40.   {
41.   	register int i;
42.   
43.   #ifdef DEBUG
44.   	if (x == 0) {
45.   		impossible("rnl(0) attempted");
46.   		return(0);
47.   	}
48.   #endif
49.   	i = RND(x);
50.   
51.   	if (Luck && rn2(50 - Luck)) {
52.   	    i -= (x <= 15 && Luck >= -5 ? Luck/3 : Luck);
53.   	    if (i < 0) i = 0;
54.   	    else if (i >= x) i = x-1;
55.   	}
56.   
57.   	return i;
58.   }
59.   
60.   #endif /* OVLB */
61.   #ifdef OVL0
62.   
63.   int
64.   rnd(x)		/* 1 <= rnd(x) <= x */
65.   register int x;
66.   {
67.   #ifdef DEBUG
68.   	if (x == 0) {
69.   		impossible("rnd(0) attempted");
70.   		return(1);
71.   	}
72.   #endif
73.   	return(RND(x)+1);
74.   }
75.   
76.   #endif /* OVL0 */
77.   #ifdef OVL1
78.   
79.   int
80.   d(n,x)		/* n <= d(n,x) <= (n*x) */
81.   register int n, x;
82.   {
83.   	register int tmp = n;
84.   
85.   #ifdef DEBUG
86.   	if (x == 0) {
87.   		impossible("d(n,0) attempted");
88.   		return(1);
89.   	}
90.   #endif
91.   	while(n--) tmp += RND(x);
92.   	return(tmp); /* Alea iacta est. -- J.C. */
93.   }
94.   
95.   #endif /* OVL1 */
96.   #ifdef OVLB
97.   
98.   int
99.   rne(x)	  /* by stewr 870807 */
100.  register int x;
101.  {
102.  	register int tmp = 1;
103.  	while(!rn2(x)) tmp++;
104.  	return(min(tmp,(u.ulevel < 15) ? 5 : (int)u.ulevel/3));
105.  }
106.  
107.  int
108.  rnz(i)
109.  int i;
110.  {
111.  #ifdef LINT
112.  	int x = i;
113.  	int tmp = 1000;
114.  #else
115.  	register long x = i;
116.  	register long tmp = 1000;
117.  #endif
118.  	tmp += rn2(1000);
119.  	tmp *= rne(4);
120.  	if (rn2(2)) { x *= tmp; x /= 1000; }
121.  	else { x *= 1000; x /= tmp; }
122.  	return((int)x);
123.  }
124.  
125.  #endif /* OVLB */
126.  
127.  /*rnd.c*/

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