projects / irc / quakenet / newserv.git / blame
| Commit | Line | Data |
|---|---|---|
| 6d9720da CP |
1 | /* |
| 2 | ------------------------------------------------------------------------------ | |
| 3 | rand.h: definitions for a random number generator | |
| 4 | By Bob Jenkins, 1996, Public Domain | |
| 5 | MODIFIED: | |
| 6 | 960327: Creation (addition of randinit, really) | |
| 7 | 970719: use context, not global variables, for internal state | |
| 8 | 980324: renamed seed to flag | |
| 9 | 980605: recommend RANDSIZL=4 for noncryptography. | |
| 10 | 010626: note this is public domain | |
| 11 | ------------------------------------------------------------------------------ | |
| 12 | */ | |
| 13 | #ifndef STANDARD | |
| 14 | # define STANDARD | |
| 15 | # ifndef STDIO | |
| 16 | # include <stdio.h> | |
| 17 | # define STDIO | |
| 18 | # endif | |
| 19 | # ifndef STDDEF | |
| 20 | # include <stddef.h> | |
| 21 | # define STDDEF | |
| 22 | # endif | |
| 23 | typedef unsigned long long ub8; | |
| 24 | #define UB8MAXVAL 0xffffffffffffffffLL | |
| 25 | #define UB8BITS 64 | |
| 26 | typedef signed long long sb8; | |
| 27 | #define SB8MAXVAL 0x7fffffffffffffffLL | |
| 28 | typedef unsigned long int ub4; /* unsigned 4-byte quantities */ | |
| 29 | #define UB4MAXVAL 0xffffffff | |
| 30 | typedef signed long int sb4; | |
| 31 | #define UB4BITS 32 | |
| 32 | #define SB4MAXVAL 0x7fffffff | |
| 33 | typedef unsigned short int ub2; | |
| 34 | #define UB2MAXVAL 0xffff | |
| 35 | #define UB2BITS 16 | |
| 36 | typedef signed short int sb2; | |
| 37 | #define SB2MAXVAL 0x7fff | |
| 38 | typedef unsigned char ub1; | |
| 39 | #define UB1MAXVAL 0xff | |
| 40 | #define UB1BITS 8 | |
| 41 | typedef signed char sb1; /* signed 1-byte quantities */ | |
| 42 | #define SB1MAXVAL 0x7f | |
| 43 | typedef int word; /* fastest type available */ | |
| 44 | ||
| 45 | #define bis(target,mask) ((target) |= (mask)) | |
| 46 | #define bic(target,mask) ((target) &= ~(mask)) | |
| 47 | #define bit(target,mask) ((target) & (mask)) | |
| 48 | #ifndef min | |
| 49 | # define min(a,b) (((a)<(b)) ? (a) : (b)) | |
| 50 | #endif /* min */ | |
| 51 | #ifndef max | |
| 52 | # define max(a,b) (((a)<(b)) ? (b) : (a)) | |
| 53 | #endif /* max */ | |
| 54 | #ifndef align | |
| 55 | # define align(a) (((ub4)a+(sizeof(void *)-1))&(~(sizeof(void *)-1))) | |
| 56 | #endif /* align */ | |
| 57 | #ifndef abs | |
| 58 | # define abs(a) (((a)>0) ? (a) : -(a)) | |
| 59 | #endif | |
| 60 | #define TRUE 1 | |
| 61 | #define FALSE 0 | |
| 62 | #define SUCCESS 0 /* 1 on VAX */ | |
| 63 | ||
| 64 | #endif /* STANDARD */ | |
| 65 | ||
| 66 | #ifndef PRNG | |
| 67 | #define PRNG | |
| 68 | #define RANDSIZL (8) /* I recommend 8 for crypto, 4 for simulations */ | |
| 69 | #define RANDSIZ (1<<RANDSIZL) | |
| 70 | ||
| 71 | /* context of random number generator */ | |
| 72 | struct prngctx | |
| 73 | { | |
| 74 | ub4 randcnt; | |
| 75 | ub4 randrsl[RANDSIZ]; | |
| 76 | ub4 randmem[RANDSIZ]; | |
| 77 | ub4 randa; | |
| 78 | ub4 randb; | |
| 79 | ub4 randc; | |
| 80 | }; | |
| 81 | typedef struct prngctx prngctx; | |
| 82 | ||
| 83 | /* | |
| 84 | ------------------------------------------------------------------------------ | |
| 85 | If (flag==TRUE), then use the contents of randrsl[0..RANDSIZ-1] as the seed. | |
| 86 | ------------------------------------------------------------------------------ | |
| 87 | */ | |
| 88 | void prnginit(/*_ prngctx *r, word flag _*/); | |
| 89 | ||
| 90 | void isaac(/*_ prngctx *r _*/); | |
| 91 | ||
| 92 | ||
| 93 | /* | |
| 94 | ------------------------------------------------------------------------------ | |
| 95 | Call rand(/o_ prngctx *r _o/) to retrieve a single 32-bit random value | |
| 96 | ------------------------------------------------------------------------------ | |
| 97 | */ | |
| 98 | #define prng(r) \ | |
| 99 | (!(r)->randcnt-- ? \ | |
| 100 | (isaac(r), (r)->randcnt=RANDSIZ-1, (r)->randrsl[(r)->randcnt]) : \ | |
| 101 | (r)->randrsl[(r)->randcnt]) | |
| 102 | ||
| 103 | #endif /* RAND */ | |
| 104 | ||
| 105 |