mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
54 lines
1.4 KiB
C++
54 lines
1.4 KiB
C++
/*******************************************************************************
|
|
|
|
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
|
|
|
|
This file is part of the Sortix C Library.
|
|
|
|
The Sortix C Library 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.
|
|
|
|
The Sortix C Library 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 the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
rand.cpp
|
|
Returns a random value.
|
|
|
|
*******************************************************************************/
|
|
|
|
#include <stdlib.h>
|
|
|
|
#if 1
|
|
|
|
static unsigned int m_w = 1337;
|
|
static unsigned int m_z = 37;
|
|
|
|
static unsigned int RandomUnsignedInt()
|
|
{
|
|
m_z = 36969 * (m_z & 65535) + (m_z >> 16);
|
|
m_w = 18000 * (m_w & 65535) + (m_w >> 16);
|
|
return (m_z << 16) + m_w; /* 32-bit result */
|
|
}
|
|
|
|
extern "C" int rand()
|
|
{
|
|
return RandomUnsignedInt() % 32768;
|
|
}
|
|
|
|
#else
|
|
|
|
static unsigned random_seed = 1337;
|
|
|
|
extern "C" int rand()
|
|
{
|
|
random_seed = random_seed + 37 * 1103515245 + 12345;
|
|
return random_seed >> 16;
|
|
}
|
|
|
|
#endif
|