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Add POSIX lcong48.

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Change-Id: I821046816661d77275cb02c8c99d526bb41afb9c
This commit is contained in:
Elliott Hughes 2014-11-06 12:40:08 -08:00
parent 39ba30354a
commit 274afe8f0e
4 changed files with 120 additions and 9 deletions
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1
libc/Android.mk
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@ -290,6 +290,7 @@ libc_upstream_netbsd_src_files := \
upstream-netbsd/lib/libc/stdlib/drand48.c \
upstream-netbsd/lib/libc/stdlib/erand48.c \
upstream-netbsd/lib/libc/stdlib/jrand48.c \
upstream-netbsd/lib/libc/stdlib/lcong48.c \
upstream-netbsd/lib/libc/stdlib/ldiv.c \
upstream-netbsd/lib/libc/stdlib/lldiv.c \
upstream-netbsd/lib/libc/stdlib/lrand48.c \

19
libc/include/stdlib.h
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@ -103,15 +103,6 @@ extern void * bsearch(const void *key, const void *base0,
extern void qsort(void *, size_t, size_t, int (*)(const void *, const void *));
extern long jrand48(unsigned short *);
extern long mrand48(void);
extern long nrand48(unsigned short *);
extern long lrand48(void);
extern unsigned short *seed48(unsigned short*);
extern double erand48(unsigned short xsubi[3]);
extern double drand48(void);
extern void srand48(long);
uint32_t arc4random(void);
uint32_t arc4random_uniform(uint32_t);
void arc4random_buf(void*, size_t);
@ -122,6 +113,16 @@ int rand(void);
int rand_r(unsigned int*);
void srand(unsigned int);
double drand48(void);
double erand48(unsigned short[3]);
long jrand48(unsigned short[3]);
void lcong48(unsigned short[7]);
long lrand48(void);
long mrand48(void);
long nrand48(unsigned short[3]);
unsigned short* seed48(unsigned short[3]);
void srand48(long);
char* initstate(unsigned int, char*, size_t);
long random(void);
char* setstate(char*);

43
libc/upstream-netbsd/lib/libc/stdlib/lcong48.c Normal file
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@ -0,0 +1,43 @@
/* $NetBSD: lcong48.c,v 1.8 2005/06/12 05:21:28 lukem Exp $ */
/*
* Copyright (c) 1993 Martin Birgmeier
* All rights reserved.
*
* You may redistribute unmodified or modified versions of this source
* code provided that the above copyright notice and this and the
* following conditions are retained.
*
* This software is provided ``as is'', and comes with no warranties
* of any kind. I shall in no event be liable for anything that happens
* to anyone/anything when using this software.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: lcong48.c,v 1.8 2005/06/12 05:21:28 lukem Exp $");
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <assert.h>
#include "rand48.h"
#ifdef __weak_alias
__weak_alias(lcong48,_lcong48)
#endif
void
lcong48(unsigned short p[7])
{
_DIAGASSERT(p != NULL);
__rand48_seed[0] = p[0];
__rand48_seed[1] = p[1];
__rand48_seed[2] = p[2];
__rand48_mult[0] = p[3];
__rand48_mult[1] = p[4];
__rand48_mult[2] = p[5];
__rand48_add = p[6];
}

66
tests/stdlib_test.cpp
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@ -28,12 +28,54 @@
#include <sys/types.h>
#include <sys/wait.h>
// The random number generator tests all set the seed, get four values, reset the seed and check
// that they get the first two values repeated, and then reset the seed and check two more values
// to rule out the possibility that we're just going round a cycle of four values.
// TODO: factor this out.
TEST(stdlib, drand48) {
srand48(0x01020304);
EXPECT_DOUBLE_EQ(0.65619299195623526, drand48());
EXPECT_DOUBLE_EQ(0.18522597229772941, drand48());
EXPECT_DOUBLE_EQ(0.42015087072844537, drand48());
EXPECT_DOUBLE_EQ(0.061637783047395089, drand48());
srand48(0x01020304);
EXPECT_DOUBLE_EQ(0.65619299195623526, drand48());
EXPECT_DOUBLE_EQ(0.18522597229772941, drand48());
srand48(0x01020304);
EXPECT_DOUBLE_EQ(0.65619299195623526, drand48());
EXPECT_DOUBLE_EQ(0.18522597229772941, drand48());
}
TEST(stdlib, erand48) {
const unsigned short seed[3] = { 0x330e, 0xabcd, 0x1234 };
unsigned short xsubi[3];
memcpy(xsubi, seed, sizeof(seed));
EXPECT_DOUBLE_EQ(0.39646477376027534, erand48(xsubi));
EXPECT_DOUBLE_EQ(0.84048536941142515, erand48(xsubi));
EXPECT_DOUBLE_EQ(0.35333609724524351, erand48(xsubi));
EXPECT_DOUBLE_EQ(0.44658343479654405, erand48(xsubi));
memcpy(xsubi, seed, sizeof(seed));
EXPECT_DOUBLE_EQ(0.39646477376027534, erand48(xsubi));
EXPECT_DOUBLE_EQ(0.84048536941142515, erand48(xsubi));
memcpy(xsubi, seed, sizeof(seed));
EXPECT_DOUBLE_EQ(0.39646477376027534, erand48(xsubi));
EXPECT_DOUBLE_EQ(0.84048536941142515, erand48(xsubi));
}
TEST(stdlib, lcong48) {
unsigned short p[7] = { 0x0102, 0x0304, 0x0506, 0x0708, 0x090a, 0x0b0c, 0x0d0e };
lcong48(p);
EXPECT_EQ(1531389981, lrand48());
EXPECT_EQ(1598801533, lrand48());
EXPECT_EQ(2080534853, lrand48());
EXPECT_EQ(1102488897, lrand48());
lcong48(p);
EXPECT_EQ(1531389981, lrand48());
EXPECT_EQ(1598801533, lrand48());
lcong48(p);
EXPECT_EQ(1531389981, lrand48());
EXPECT_EQ(1598801533, lrand48());
}
TEST(stdlib, lrand48) {
@ -42,6 +84,12 @@ TEST(stdlib, lrand48) {
EXPECT_EQ(397769746, lrand48());
EXPECT_EQ(902267124, lrand48());
EXPECT_EQ(132366131, lrand48());
srand48(0x01020304);
EXPECT_EQ(1409163720, lrand48());
EXPECT_EQ(397769746, lrand48());
srand48(0x01020304);
EXPECT_EQ(1409163720, lrand48());
EXPECT_EQ(397769746, lrand48());
}
TEST(stdlib, random) {
@ -50,6 +98,12 @@ TEST(stdlib, random) {
EXPECT_EQ(1399865117, random());
EXPECT_EQ(2032643283, random());
EXPECT_EQ(571329216, random());
srandom(0x01020304);
EXPECT_EQ(55436735, random());
EXPECT_EQ(1399865117, random());
srandom(0x01020304);
EXPECT_EQ(55436735, random());
EXPECT_EQ(1399865117, random());
}
TEST(stdlib, rand) {
@ -58,6 +112,12 @@ TEST(stdlib, rand) {
EXPECT_EQ(1399865117, rand());
EXPECT_EQ(2032643283, rand());
EXPECT_EQ(571329216, rand());
srand(0x01020304);
EXPECT_EQ(55436735, rand());
EXPECT_EQ(1399865117, rand());
srand(0x01020304);
EXPECT_EQ(55436735, rand());
EXPECT_EQ(1399865117, rand());
}
TEST(stdlib, mrand48) {
@ -66,6 +126,12 @@ TEST(stdlib, mrand48) {
EXPECT_EQ(795539493, mrand48());
EXPECT_EQ(1804534249, mrand48());
EXPECT_EQ(264732262, mrand48());
srand48(0x01020304);
EXPECT_EQ(-1476639856, mrand48());
EXPECT_EQ(795539493, mrand48());
srand48(0x01020304);
EXPECT_EQ(-1476639856, mrand48());
EXPECT_EQ(795539493, mrand48());
}
TEST(stdlib, posix_memalign) {