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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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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) {