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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 Open Source Routing.
* Copyright (C) 2012 by Internet Systems Consortium, Inc. ("ISC") * Copyright (C) 2012 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 2017 Christian Franke
* *
* This file is part of Quagga * This file is part of Quagga
* *
@ -32,49 +33,32 @@
struct prng struct prng
{ {
unsigned long long state1; uint64_t state;
unsigned long long state2;
}; };
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* struct prng*
prng_new(unsigned long long seed) prng_new(unsigned long long seed)
{ {
struct prng *rv = calloc(sizeof(*rv), 1); struct prng *rv = calloc(sizeof(*rv), 1);
assert(rv); assert(rv);
rv->state1 = rv->state2 = seed; rv->state = seed;
return rv; 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) prng_rand(struct prng *prng)
{ {
unsigned int i, rv = 0; prng->state = 6364136223846793005ULL*prng->state + 1;
return prng->state>>33;
for (i = 0; i < 32; i++)
{
rv |= prng_bit(prng);
rv <<= 1;
}
return rv;
} }
const char * const char *

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

@ -27,7 +27,7 @@
struct prng; struct prng;
struct prng* prng_new(unsigned long long seed); 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 * prng_fuzz(struct prng*,
const char *string, const char *string,
const char *charset, 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, test_state_del_one_route(struct test_state *test,
struct prng *prng) 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 route_node *rn;
struct prefix *dst_p, *src_p; struct prefix *dst_p, *src_p;
struct prefix_ipv6 dst6_p, src6_p; struct prefix_ipv6 dst6_p, src6_p;