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bxirand.c
executable file
·65 lines (54 loc) · 1.63 KB
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bxirand.c
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/*
* "Bixi" - Basic types management C89 library
*
* Copyright (C) Alexey Shishkin 2017
*
* This file is part of Project "Bixi".
*
* Project "Bixi" is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Project "Bixi" 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Project "Bixi". If not, see <http://www.gnu.org/licenses/>.
*/
#include "../random/bxirand.h"
#define BXI_RAND_MULTIPLIER (1103515245)
#define BXI_RAND_INCREMENT (12345)
static u32 global_next = 1;
static void nextrand(void) {
global_next = global_next * BXI_RAND_MULTIPLIER + BXI_RAND_INCREMENT;
}
void bxi_srand(u32 seed) {
global_next = seed;
}
u32 bxi_randu32(void) {
nextrand();
return global_next;
}
u16 bxi_randu16(void) {
nextrand();
return (global_next >> BITS_IN_U16) % (U16_MAX + 1);
}
u8 bxi_randu8 (void) {
nextrand();
return (global_next >> BITS_IN_U8) % (U8_MAX + 1);
}
i32 bxi_randi32(void) {
nextrand();
return (i32)global_next;
}
i16 bxi_randi16(void) {
nextrand();
return (i16)((global_next >> BITS_IN_U16) % (U16_MAX + 1));
}
i8 bxi_randi8 (void) {
nextrand();
return (i8)((global_next >> BITS_IN_U8) % (U8_MAX + 1));
}