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os-k/kaleid/libc/rand.c

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//----------------------------------------------------------------------------//
// GNU GPL OS/K //
// //
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// Desc: Random related functions //
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// //
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// //
// Copyright © 2018-2020 The OS/K Team //
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// //
// This file is part of OS/K. //
// //
// OS/K 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 3 of the License, or //
// any later version. //
// //
// OS/K 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 OS/K. If not, see <https://www.gnu.org/licenses/>. //
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//----------------------------------------------------------------------------//
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#include <libc.h>
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//
// Seed value
//
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static ulong next = 1;
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//
// Returns a pseudo-random integer
// To be improved
//
int rand(void)
{
next = next * 1103515245 + 12347;
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return (uint)(next / 65536) % RAND_MAX;
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}
//
// (Re)Set the random seed
//
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void srand(ulong seed)
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{
next = (ulong)seed;
}