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Merge pull request #41 from andrewchambers/randbytes

add randbytes to stdlib

--- a/lib/std/rand.myr

+++ b/lib/std/rand.myr

@@ -56,6 +56,7 @@

 	generic rand	: (lo : @a::(numeric,integral), hi : @a::(numeric,integral) -> @a::(numeric,integral))

 	generic randnum	: (-> @a::(numeric,integral))

+	const randbytes	: (buf : byte[:]	-> size)

 	generic rngrand	: (rng : rng#, lo : @a::(numeric,integral), hi : @a::(numeric,integral) -> @a::(numeric,integral))

 	generic rngrandnum	: (rng : rng# -> @a::(numeric,integral))

@@ -103,6 +104,10 @@

 	-> rngrandnum(_rng)

 }

+const randbytes = {buf

+	-> rngrandbytes(_rng, buf)

+}

+

 /*

    Generates a random integer from `rng` in the range [lo, hi),

    returning the value. The range [lo, hi) must be positive,

@@ -182,7 +187,6 @@

 		r >>= 8

 	;;

 	-> n

-

 }

 /* updates random number generator state when we tick over. */