From: wessels <>
Date: Thu, 8 Oct 1998 01:34:01 +0000 (+0000)
Subject: adding
X-Git-Tag: SQUID_3_0_PRE1~2606
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5d5f33bc61a1978faf7156f6f9dee8eb181aa10d;p=thirdparty%2Fsquid.git

adding
---

diff --git a/lib/drand48.c b/lib/drand48.c
new file mode 100644
index 0000000000..996017f1ed
--- /dev/null
+++ b/lib/drand48.c
@@ -0,0 +1,53 @@
+/* borrowed from libc/misc/drand48.c in Linux libc-5.4.46 this quick
+   hack by Martin Hamilton <martinh@gnu.org> to make Squid build on
+   Win32 with GNU-Win32 - sorry, folks! */
+
+#ifndef HAVE_DRAND48
+
+#define N	16
+#define MASK	((unsigned)(1 << (N - 1)) + (1 << (N - 1)) - 1)
+#define LOW(x)	((unsigned)(x) & MASK)
+#define HIGH(x)	LOW((x) >> N)
+#define MUL(x, y, z)	{ long l = (long)(x) * (long)(y); \
+		(z)[0] = LOW(l); (z)[1] = HIGH(l); }
+#define CARRY(x, y)	((long)(x) + (long)(y) > MASK)
+#define ADDEQU(x, y, z)	(z = CARRY(x, (y)), x = LOW(x + (y)))
+#define X0	0x330E
+#define X1	0xABCD
+#define X2	0x1234
+#define A0	0xE66D
+#define A1	0xDEEC
+#define A2	0x5
+#define C	0xB
+
+static void next( void );
+static unsigned x[3] = { X0, X1, X2 }, a[3] = { A0, A1, A2 }, c = C;
+
+double drand48( void );
+
+double
+drand48( void )
+{
+	static double two16m = 1.0 / (1L << N);
+	next();
+	return (two16m * (two16m * (two16m * x[0] + x[1]) + x[2]));
+}
+
+static void
+next( void )
+{
+	unsigned p[2], q[2], r[2], carry0, carry1;
+
+	MUL(a[0], x[0], p);
+	ADDEQU(p[0], c, carry0);
+	ADDEQU(p[1], carry0, carry1);
+	MUL(a[0], x[1], q);
+	ADDEQU(p[1], q[0], carry0);
+	MUL(a[1], x[0], r);
+	x[2] = LOW(carry0 + carry1 + CARRY(p[1], r[0]) + q[1] + r[1] +
+		a[0] * x[2] + a[1] * x[1] + a[2] * x[0]);
+	x[1] = LOW(p[1] + r[0]);
+	x[0] = LOW(p[0]);
+}
+
+#endif /* HAVE_DRAND48 */