From a067356625105f50978443d3b0a0a5d8f6391184 Mon Sep 17 00:00:00 2001 From: Mart Lubbers Date: Fri, 24 Apr 2015 14:35:17 +0200 Subject: rare shit --- fp2/week2/mart/oldold/old/Random.icl | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) create mode 100644 fp2/week2/mart/oldold/old/Random.icl (limited to 'fp2/week2/mart/oldold/old/Random.icl') diff --git a/fp2/week2/mart/oldold/old/Random.icl b/fp2/week2/mart/oldold/old/Random.icl new file mode 100644 index 0000000..b6e0768 --- /dev/null +++ b/fp2/week2/mart/oldold/old/Random.icl @@ -0,0 +1,20 @@ +implementation module Random + +import StdFile, StdList, StdMisc, StdArray, Random + +:: RandomSeed :== Int + +nullRandomSeed :: RandomSeed +nullRandomSeed = 0 + +getNewRandomSeed :: !*env -> (!RandomSeed, !*env) | FileSystem env +getNewRandomSeed env +# (ok, src, env) = sfopen "/dev/urandom" FReadData env +| not ok => abort "could not open /dev/urandom" +# (bytes, src) = sfreads src 4 + seed = foldl (\x y->(x<<8)+toInt y) 0 [c \\ c<-:bytes] +| otherwise => (seed, env) + +random :: !RandomSeed -> .(!Int, !RandomSeed) +random seed = (seed>>16 bitand 0xFFFF, seed*0x08088405+1) + -- cgit v1.2.3