Contents of /tags/mkinitrd-6_2_3/busybox/shell/random.h
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Mon May 31 20:54:44 2010 UTC (14 years, 3 months ago) by niro
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Mon May 31 20:54:44 2010 UTC (14 years, 3 months ago) by niro
File MIME type: text/plain
File size: 741 byte(s)
tagged 'mkinitrd-6_2_3'
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * $RANDOM support. |
4 | * |
5 | * Copyright (C) 2009 Denys Vlasenko |
6 | * |
7 | * Licensed under GPLv2, see file LICENSE in this tarball for details. |
8 | */ |
9 | #ifndef SHELL_RANDOM_H |
10 | #define SHELL_RANDOM_H 1 |
11 | |
12 | PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN |
13 | |
14 | typedef struct random_t { |
15 | /* Random number generators */ |
16 | int32_t galois_LFSR; /* Galois LFSR (fast but weak). signed! */ |
17 | uint32_t LCG; /* LCG (fast but weak) */ |
18 | } random_t; |
19 | |
20 | #define UNINITED_RANDOM_T(rnd) \ |
21 | ((rnd)->galois_LFSR == 0) |
22 | |
23 | #define INIT_RANDOM_T(rnd, nonzero, v) \ |
24 | ((rnd)->galois_LFSR = (nonzero), (rnd)->LCG = (v)) |
25 | |
26 | #define CLEAR_RANDOM_T(rnd) \ |
27 | ((rnd)->galois_LFSR = 0) |
28 | |
29 | uint32_t next_random(random_t *rnd) FAST_FUNC; |
30 | |
31 | POP_SAVED_FUNCTION_VISIBILITY |
32 | |
33 | #endif |