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34 lines
602 B
V
34 lines
602 B
V
// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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module rand
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pub fn seed(s int) {
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C.srand(s)
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}
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pub fn next(max int) int {
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return C.rand() % max
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}
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fn C.rand() int
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/**
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* rand_r - reentrant pseudo-random number generator
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*
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* @param seed byref reentrant seed, holding current state
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*
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* @return a value between 0 and C.RAND_MAX (inclusive)
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*/
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pub fn rand_r(seed &int) int {
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unsafe{
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mut rs := seed
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ns := (*rs * 1103515245 + 12345)
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*rs = ns
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return ns & 0x7fffffff
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}
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}
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