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Also provide erand48 and jrand48, they come almost for free

This commit is contained in:
Rémi Denis-Courmont 2010-03-06 11:31:34 +02:00
parent df9356f54b
commit d663d29a58
2 changed files with 21 additions and 3 deletions
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22
compat/nrand48.c
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@ -1,5 +1,5 @@
/*****************************************************************************
* nrand48.c: POSIX nrand48() replacement
* nrand48.c: POSIX erand48(), jrand48() and nrand48() replacements
*****************************************************************************
* Copyright © 2010 Rémi Denis-Courmont
*
@ -24,7 +24,7 @@
#include <inttypes.h>
long nrand48 (unsigned short subi[3])
static uint64_t iterate48 (unsigned short subi[3])
{
const uint64_t a = UINT64_C(0x5DEECE66D);
const unsigned c = 13;
@ -42,5 +42,21 @@ long nrand48 (unsigned short subi[3])
subi[1] = (x >> 16) & 0xFFFF;
subi[2] = (x >> 0) & 0XFFFF;
return x >> 17;
return x;
}
double erand48 (unsigned short subi[3])
{
uint64_t r = iterate48 (subi);
return ((double)r) / 281474976710655.;
}
long jrand48 (unsigned short subi[3])
{
return ((int64_t)iterate48 (subi)) >> 16;
}
long nrand48 (unsigned short subi[3])
{
return iterate48 (subi) >> 17;
}

2
include/vlc_fixups.h
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@ -241,6 +241,8 @@ struct pollfd
/* Random numbers */
#ifndef HAVE_NRAND48
double erand48 (unsigned short subi[3]);
long jrand48 (unsigned short subi[3]);
long nrand48 (unsigned short subi[3]);
#endif