RepoMirrors
/
musl
mirror of git://git.musl-libc.org/musl
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

fix initstate to make the state buffer usable in setstate 

setstate could use the results of previous initstate or setstate
calls (they return the old state buffer), but the documentation
requires that an initialized state buffer should be possible to
use in setstate immediately, which means that initstate should
save the generator parameters in it.

I also removed the copyright notice since it is present in the
copyright file.
This commit is contained in:
Szabolcs Nagy 2014-01-21 02:01:35 +01:00
parent 7cbb6f70c8
commit 1569f396bb
1 changed files with 2 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
src/prng/random.c
View File

@ -1,10 +1,3 @@
/*
* random.c - Copyright © 2011 Szabolcs Nagy
* Permission to use, copy, modify, and/or distribute this code
* for any purpose with or without fee is hereby granted.
* There is no warranty.
*/
#include <stdlib.h>
#include <stdint.h>
#include "libc.h"
@ -12,11 +5,7 @@
/*
this code uses the same lagged fibonacci generator as the
original bsd random implementation except for the seeding
different seeds produce different sequences with long period
(other libcs seed the state with a park-miller generator
when seed=0 some fail to produce good random sequence
others produce the same sequence as another seed)
which was broken in the original
*/
static uint32_t init[] = {
@ -98,6 +87,7 @@ char *initstate(unsigned seed, char *state, size_t size) {
n = 63;
x = (uint32_t*)state + 1;
__srandom(seed);
savestate();
UNLOCK(lock);
return old;
}