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authorRich Felker <dalias@aerifal.cx>2011-02-12 00:22:29 -0500
committerRich Felker <dalias@aerifal.cx>2011-02-12 00:22:29 -0500
commit0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 (patch)
tree6eaef0d8a720fa3da580de87b647fff796fe80b3 /src/prng/drand48.c
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initial check-in, version 0.5.0 v0.5.0
Diffstat (limited to 'src/prng/drand48.c')
-rw-r--r--src/prng/drand48.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/src/prng/drand48.c b/src/prng/drand48.c
new file mode 100644
index 00000000..d808353c
--- /dev/null
+++ b/src/prng/drand48.c
@@ -0,0 +1,19 @@
+#include <stdlib.h>
+#include <inttypes.h>
+
+uint64_t __rand48_step(unsigned short *xi, unsigned short *lc);
+extern unsigned short __seed48[7];
+
+double erand48(unsigned short s[3])
+{
+	union {
+		uint64_t u;
+		double f;
+	} x = { 0x3ff0000000000000ULL | __rand48_step(s, __seed48+3)<<4 };
+	return x.f - 1.0;
+}
+
+double drand48(void)
+{
+	return erand48(__seed48);
+}