From bc46671a9bcacca1e2fab1dd6468e72d954230bf Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Thu, 15 Aug 2002 13:02:13 +0000
Subject: Patch from Jarkko to fix drand48 to not use long long when long long
 support is disabled in the uClibc Config.

---
 libc/stdlib/drand48-iter.c | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

(limited to 'libc/stdlib/drand48-iter.c')

diff --git a/libc/stdlib/drand48-iter.c b/libc/stdlib/drand48-iter.c
index a69d03326..3247bafbd 100644
--- a/libc/stdlib/drand48-iter.c
+++ b/libc/stdlib/drand48-iter.c
@@ -27,6 +27,7 @@
 struct drand48_data __libc_drand48_data;
 
 
+#ifdef __UCLIBC_HAS_LONG_LONG__
 int
 __drand48_iterate (unsigned short int xsubi[3], struct drand48_data *buffer)
 {
@@ -55,3 +56,42 @@ __drand48_iterate (unsigned short int xsubi[3], struct drand48_data *buffer)
 
   return 0;
 }
+
+#else
+int
+__drand48_iterate (unsigned short int xsubi[3], struct drand48_data *buffer)
+{
+  uint32_t X0, X1;
+  uint32_t result0, result1;
+
+  /* Initialize buffer, if not yet done.  */
+  if (unlikely(!buffer->__init))
+    {
+      buffer->__a1 = 0x5;
+      buffer->__a0 = 0xdeece66d;
+      buffer->__c = 0xb;
+      buffer->__init = 1;
+    }
+
+  /* Do the real work.  We choose a data type which contains at least
+     48 bits.  Because we compute the modulus it does not care how
+     many bits really are computed.  */
+
+  /* X = X1*base32 + X0 */
+  X1 = xsubi[2];
+  X0 = xsubi[0] | (uint32_t) xsubi[1] << 16;
+
+  result0 = buffer->__a0 * X0;
+  result1 = (result0 > -buffer->__c ); /* Carry */
+  /* If this overflows, the carry is already in result1 */
+  result0 += buffer->__c;
+
+  result1 += buffer->__a1*X0 + buffer->__a0*X1;
+
+  xsubi[0] = result0 & 0xffff;
+  xsubi[1] = result0 >> 16;
+  xsubi[2] = result1 & 0xffff;
+
+  return 0;
+}
+#endif
-- 
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