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tests: update prng to return better pseudo random numbers

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Signed-off-by: Christian Franke <chris@opensourcerouting.org>
This commit is contained in:
Christian Franke 2017-07-12 18:44:44 +02:00
parent 991ae35b17
commit 6c968614b5
3 changed files with 21 additions and 31 deletions
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42
tests/helpers/c/prng.c
View File

@ -4,6 +4,7 @@
*
* Copyright (C) 2012 by Open Source Routing.
* Copyright (C) 2012 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 2017 Christian Franke
*
* This file is part of Quagga
*
@ -32,49 +33,32 @@
struct prng
{
unsigned long long state1;
unsigned long long state2;
uint64_t state;
};
static char
prng_bit(struct prng *prng)
{
prng->state1 *= 2416;
prng->state1 += 374441;
prng->state1 %= 1771875;
if (prng->state1 % 2)
{
prng->state2 *= 84589;
prng->state2 += 45989;
prng->state2 %= 217728;
}
return prng->state2 % 2;
}
struct prng*
prng_new(unsigned long long seed)
{
struct prng *rv = calloc(sizeof(*rv), 1);
assert(rv);
rv->state1 = rv->state2 = seed;
rv->state = seed;
return rv;
}
unsigned int
/*
* This implementation has originally been provided to musl libc by
* Szabolcs Nagy <nsz at port70 dot net> in 2013 under the terms of
* the MIT license.
* It is a simple LCG which D.E. Knuth attributes to C.E. Haynes in
* TAOCP Vol2 3.3.4
*/
int
prng_rand(struct prng *prng)
{
unsigned int i, rv = 0;
for (i = 0; i < 32; i++)
{
rv |= prng_bit(prng);
rv <<= 1;
}
return rv;
prng->state = 6364136223846793005ULL*prng->state + 1;
return prng->state>>33;
}
const char *

2
tests/helpers/c/prng.h
View File

@ -27,7 +27,7 @@
struct prng;
struct prng* prng_new(unsigned long long seed);
unsigned int prng_rand(struct prng*);
int prng_rand(struct prng*);
const char * prng_fuzz(struct prng*,
const char *string,
const char *charset,

8
tests/lib/test_srcdest_table.c
View File

@ -386,7 +386,13 @@ static void
test_state_del_one_route(struct test_state *test,
struct prng *prng)
{
unsigned int which_route = prng_rand(prng) % test->log->count;
unsigned int which_route;
if (test->log->count == 0)
return;
which_route = prng_rand(prng) % test->log->count;
struct route_node *rn;
struct prefix *dst_p, *src_p;
struct prefix_ipv6 dst6_p, src6_p;