/usr/lib/ats-anairiats-0.2.5/libc/DATS/random.dats is in ats-lang-anairiats 0.2.5-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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(* *)
(* Applied Type System *)
(* *)
(* Hongwei Xi *)
(* *)
(***********************************************************************)
(*
** ATS - Unleashing the Potential of Types!
**
** Copyright (C) 2002-2010 Hongwei Xi, Boston University
**
** All rights reserved
**
** ATS is free software; you can redistribute it and/or modify it under
** the terms of the GNU General Public License as published by the Free
** Software Foundation; either version 2.1, or (at your option) any later
** version.
**
** ATS is distributed in the hope that it will be useful, but WITHOUT ANY
** WARRANTY; without even the implied warranty of MERCHANTABILITY or
** FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
** for more details.
**
** You should have received a copy of the GNU General Public License
** along with ATS; see the file COPYING. If not, please write to the
** Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
** 02110-1301, USA.
*)
(* ****** ****** *)
(* author: Hongwei Xi (hwxi AT cs DOT bu DOT edu) *)
(* ****** ****** *)
#define ATS_DYNLOADFLAG 0 // no dynamic loading
(* ****** ****** *)
staload _(*anon*) = "prelude/DATS/array.dats"
(* ****** ****** *)
staload "libc/sys/SATS/time.sats" // for gettimeofday
staload "libc/sys/SATS/types.sats" // for several lint_of* functions
(* ****** ****** *)
staload "libc/SATS/random.sats"
(* ****** ****** *)
implement
srand48_with_gettimeofday () = let
var tv: timeval?
val err = gettimeofday (tv)
val () = if err = 0 then let
prval () = opt_unsome {timeval} (tv)
val seed = (lint_of)tv.tv_sec * 1000000L + (lint_of)tv.tv_usec
val () = srand48 (seed)
in
// nothing
end else let
prval () = opt_unnone {timeval} (tv)
in
// nothing
end // end of [if]
in
err (* 0/-1 : succ/fail *)
end // end of [srand48_with_gettimeofday]
(* ****** ****** *)
implement
randint {n} (n) = let
val d01 = drand48 ()
val r = int_of (d01 * n)
val [r:int] r = int1_of (r)
prval () = __assert () where {
extern prfun __assert (): [0 <= r; r <= n] void
} // end of [prval]
in
if r < n then r else 0
end // end of [randint]
(* ****** ****** *)
implement
randperm {n} (n) = let
typedef elt = natLt (n)
val asz = size1_of_int1 (n)
val (pfgc, pfarr | p) = array_ptr_alloc<int> (asz)
val () = loop (pfarr | n, p, 0) where {
fun loop {i:nat | i <= n} {l:addr} .<n-i>. (
pfarr: !array_v (int?, n-i, l) >> array_v (elt, n-i, l)
| n: int n, p: ptr l, i: int i
) :<> void =
if i < n then let
prval (pfat1, pfarr2) = array_v_uncons {int?} (pfarr)
val () = !p := i
val () = loop (pfarr2 | n, p + sizeof<int>, i+1)
prval () = pfarr := array_v_cons {elt} (pfat1, pfarr2)
in
// nothing
end else let
prval () = array_v_unnil {int?} (pfarr)
prval () = pfarr := array_v_nil {elt} ()
in
// nothing
end // end of [if]
// end of [loop]
} // end of [val]
val () = loop (pfarr | n, p, 0) where {
fun loop {i:nat | i <= n} {l:addr} .<n-i>. (
pfarr: !array_v (elt, n-i, l) | n: int n, p: ptr l, i: int i
) :<!ref> void =
if n - i >= 2 then let
val k = randint (n-i)
val () = array_ptr_exch__intsz (!p, 0, k)
prval (pfat1, pfarr2) = array_v_uncons {elt} (pfarr)
val () = loop (pfarr2 | n, p+sizeof<int>, i+1)
prval () = pfarr := array_v_cons {elt} (pfat1, pfarr2)
in
// nothing
end // end of [if]
// end of [loop]
} // end of [val]
in
(pfgc, pfarr | p)
end // end of [randperm]
(* ****** ****** *)
implement
randint_r {n}
(buf, n, res) = let
var d01: double
val _0 = drand48_r (buf, d01)
val r = int_of (d01 * n)
val [r:int] r = int1_of (r)
prval () = __assert () where {
extern prfun __assert (): [0 <= r; r <= n] void
} // end of [prval]
in
if r < n then res := r else res := 0
end // end of [randint_r]
(* ****** ****** *)
(* end of [random.dats] *)
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