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v/vlib/rand/musl_rng.v

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// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module rand
import math.bits
// Ported from https://git.musl-libc.org/cgit/musl/tree/src/prng/rand_r.c
pub struct MuslRNG {
mut:
state u32 = time_seed_32()
}
pub fn (mut rng MuslRNG) seed(seed_data []u32) {
if seed_data.len != 1 {
eprintln('MuslRNG needs only one unsigned 32 bit integer as a seed.')
exit(1)
}
rng.state = seed_data[0]
}
[inline]
fn temper(prev u32) u32 {
mut x := prev
x ^= x >> 11
x ^= (x << 7) & 0x9D2C5680
x ^= (x << 15) & 0xEFC60000
x ^= (x >> 18)
return x
}
// rng.u32() - return a pseudorandom 32 bit unsigned u32
[inline]
pub fn (mut rng MuslRNG) u32() u32 {
rng.state = rng.state * 1103515245 + 12345
// We are not dividing by 2 (or shifting right by 1)
// because we want all 32-bits of random data
return temper(rng.state)
}
// rng.u64() - return a pseudorandom 64 bit unsigned u64
[inline]
pub fn (mut rng MuslRNG) u64() u64 {
return u64(rng.u32()) | (u64(rng.u32()) << 32)
}
// rn.u32n(max) - return a pseudorandom 32 bit unsigned u32 in [0, max)
[inline]
pub fn (mut rng MuslRNG) u32n(max u32) u32 {
if max == 0 {
eprintln('max must be positive integer')
exit(1)
}
// Check SysRNG in system_rng.c.v for explanation
bit_len := bits.len_32(max)
if bit_len == 32 {
for {
value := rng.u32()
if value < max {
return value
}
}
} else {
mask := (u32(1) << (bit_len + 1)) - 1
for {
value := rng.u32() & mask
if value < max {
return value
}
}
}
return u32(0)
}
// rn.u64n(max) - return a pseudorandom 64 bit unsigned u64 in [0, max)
[inline]
pub fn (mut rng MuslRNG) u64n(max u64) u64 {
if max == 0 {
eprintln('max must be positive integer')
exit(1)
}
bit_len := bits.len_64(max)
if bit_len == 64 {
for {
value := rng.u64()
if value < max {
return value
}
}
} else {
mask := (u64(1) << (bit_len + 1)) - 1
for {
value := rng.u64() & mask
if value < max {
return value
}
}
}
return u64(0)
}
// rn.u32_in_range(min, max) - return a pseudorandom 32 bit unsigned u32 in [min, max)
[inline]
pub fn (mut rng MuslRNG) u32_in_range(min, max u64) u64 {
if max <= min {
eprintln('max must be greater than min')
exit(1)
}
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return min + rng.u32n(u32(max - min))
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}
// rn.u64_in_range(min, max) - return a pseudorandom 64 bit unsigned u64 in [min, max)
[inline]
pub fn (mut rng MuslRNG) u64_in_range(min, max u64) u64 {
if max <= min {
eprintln('max must be greater than min')
exit(1)
}
return min + rng.u64n(max - min)
}
// rng.int() - return a 32-bit signed (possibly negative) int
[inline]
pub fn (mut rng MuslRNG) int() int {
return int(rng.u32())
}
// rng.i64() - return a 64-bit signed (possibly negative) i64
[inline]
pub fn (mut rng MuslRNG) i64() i64 {
return i64(rng.u64())
}
// rng.int31() - return a 31bit positive pseudorandom integer
[inline]
pub fn (mut rng MuslRNG) int31() int {
return int(rng.u32() >> 1)
}
// rng.int63() - return a 63bit positive pseudorandom integer
[inline]
pub fn (mut rng MuslRNG) int63() i64 {
return i64(rng.u64() >> 1)
}
// rng.intn(max) - return a 32bit positive int in [0, max)
[inline]
pub fn (mut rng MuslRNG) intn(max int) int {
if max <= 0 {
eprintln('max has to be positive.')
exit(1)
}
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return int(rng.u32n(u32(max)))
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}
// rng.i64n(max) - return a 64bit positive i64 in [0, max)
[inline]
pub fn (mut rng MuslRNG) i64n(max i64) i64 {
if max <= 0 {
eprintln('max has to be positive.')
exit(1)
}
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return i64(rng.u64n(u64(max)))
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}
// rng.int_in_range(min, max) - return a 32bit positive int in [0, max)
[inline]
pub fn (mut rng MuslRNG) int_in_range(min, max int) int {
if max <= min {
eprintln('max must be greater than min.')
exit(1)
}
return min + rng.intn(max - min)
}
// rng.i64_in_range(min, max) - return a 64bit positive i64 in [0, max)
[inline]
pub fn (mut rng MuslRNG) i64_in_range(min, max i64) i64 {
if max <= min {
eprintln('max must be greater than min.')
exit(1)
}
return min + rng.i64n(max - min)
}
// rng.f32() returns a pseudorandom f32 value between 0.0 (inclusive) and 1.0 (exclusive) i.e [0, 1)
[inline]
pub fn (mut rng MuslRNG) f32() f32 {
return f32(rng.u32()) / max_u32_as_f32
}
// rng.f64() returns a pseudorandom f64 value between 0.0 (inclusive) and 1.0 (exclusive) i.e [0, 1)
[inline]
pub fn (mut rng MuslRNG) f64() f64 {
return f64(rng.u64()) / max_u64_as_f64
}
// rng.f32n() returns a pseudorandom f32 value in [0, max)
[inline]
pub fn (mut rng MuslRNG) f32n(max f32) f32 {
if max <= 0 {
eprintln('max has to be positive.')
exit(1)
}
return rng.f32() * max
}
// rng.f64n() returns a pseudorandom f64 value in [0, max)
[inline]
pub fn (mut rng MuslRNG) f64n(max f64) f64 {
if max <= 0 {
eprintln('max has to be positive.')
exit(1)
}
return rng.f64() * max
}
// rng.f32_in_range(min, max) returns a pseudorandom f32 that lies in [min, max)
[inline]
pub fn (mut rng MuslRNG) f32_in_range(min, max f32) f32 {
if max <= min {
eprintln('max must be greater than min')
exit(1)
}
return min + rng.f32n(max - min)
}
// rng.i64_in_range(min, max) returns a pseudorandom i64 that lies in [min, max)
[inline]
pub fn (mut rng MuslRNG) f64_in_range(min, max f64) f64 {
if max <= min {
eprintln('max must be greater than min')
exit(1)
}
return min + rng.f64n(max - min)
}