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Update libc/stdlib/rand.cpp to current coding conventions.

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This commit is contained in:
Jonas 'Sortie' Termansen 2014-01-08 23:36:43 +01:00
parent 9cd3cdf79c
commit df666103b3
1 changed files with 9 additions and 27 deletions
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36
libc/stdlib/rand.cpp
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@ -1,6 +1,6 @@
/******************************************************************************* /*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012. Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2014.
This file is part of the Sortix C Library. This file is part of the Sortix C Library.
@ -22,23 +22,22 @@
*******************************************************************************/ *******************************************************************************/
#include <stdint.h>
#include <stdlib.h> #include <stdlib.h>
#if 1 static uint32_t m_w = 1337;
static uint32_t m_z = 37;
static unsigned int m_w = 1337; static uint32_t random_32_bits()
static unsigned int m_z = 37;
static unsigned int RandomUnsignedInt()
{ {
m_z = 36969 * (m_z & 65535) + (m_z >> 16); m_z = 36969 * (m_z >> 0 & 0xFFFF) + (m_z >> 16 & 0xFFFF);
m_w = 18000 * (m_w & 65535) + (m_w >> 16); m_w = 18000 * (m_w >> 0 & 0xFFFF) + (m_w >> 16 & 0xFFFF);
return (m_z << 16) + m_w; /* 32-bit result */ return (m_z << 16) + m_w;
} }
extern "C" int rand() extern "C" int rand()
{ {
return RandomUnsignedInt() % 32768; return (int) (random_32_bits() % ((uint32_t) RAND_MAX + 1));
} }
extern "C" void srand(unsigned int seed) extern "C" void srand(unsigned int seed)
@ -46,20 +45,3 @@ extern "C" void srand(unsigned int seed)
m_w = seed >> 16 & 0xFFFF; m_w = seed >> 16 & 0xFFFF;
m_z = seed >> 0 & 0xFFFF; m_z = seed >> 0 & 0xFFFF;
} }
#else
static unsigned random_seed = 1337;
extern "C" int rand()
{
random_seed = random_seed + 37 * 1103515245 + 12345;
return random_seed >> 16;
}
extern "C" void srand(unsigned int seed)
{
random_seed = seed;
}
#endif