From b750a675b29defac3b8de7c34623e8bcd9e2c83f Mon Sep 17 00:00:00 2001
From: augustss <augustss@pkgsrc.org>
Date: Wed, 2 Feb 2005 11:22:42 +0000
Subject: Fix a bug in quantum_measure() that returns the wrong state when
 measuring a quantum register.

---
 misc/libquantum/distinfo         |  3 ++-
 misc/libquantum/patches/patch-aa | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 misc/libquantum/patches/patch-aa

(limited to 'misc')

diff --git a/misc/libquantum/distinfo b/misc/libquantum/distinfo
index 68d105bcfe8..ed8f59a7277 100644
--- a/misc/libquantum/distinfo
+++ b/misc/libquantum/distinfo
@@ -1,4 +1,5 @@
-$NetBSD: distinfo,v 1.1 2005/02/01 20:52:38 augustss Exp $
+$NetBSD: distinfo,v 1.2 2005/02/02 11:22:42 augustss Exp $
 
 SHA1 (libquantum-0.2.4.tar.gz) = dbd76434b7d4026db96aedcd16ae4cd01fb341cd
 Size (libquantum-0.2.4.tar.gz) = 211403 bytes
+SHA1 (patch-aa) = 734170cbc1a30815e89311f0a2d2df5a8d30b3d2
diff --git a/misc/libquantum/patches/patch-aa b/misc/libquantum/patches/patch-aa
new file mode 100644
index 00000000000..e6ef630fead
--- /dev/null
+++ b/misc/libquantum/patches/patch-aa
@@ -0,0 +1,36 @@
+*** measure.c.old	Tue Jan 11 22:12:21 2005
+--- measure.c	Wed Feb  2 12:17:54 2005
+***************
+*** 39,45 ****
+  double 
+  quantum_frand()
+  {
+!   return (double) rand() / RAND_MAX;
+  }
+  
+  /* Measure the contents of a quantum register */
+--- 39,45 ----
+  double 
+  quantum_frand()
+  {
+!   return (double) random() / RAND_MAX;
+  }
+  
+  /* Measure the contents of a quantum register */
+***************
+*** 64,70 ****
+  	 result. Otherwise, continue with the next base state. */
+  
+        r -= quantum_prob_inline(reg.node[i].amplitude);
+!       if(quantum_prob_inline(reg.node[i].amplitude) >= r)
+  	return reg.node[i].state;
+      }
+  
+--- 64,70 ----
+  	 result. Otherwise, continue with the next base state. */
+  
+        r -= quantum_prob_inline(reg.node[i].amplitude);
+!       if(0 >= r)
+  	return reg.node[i].state;
+      }
+  
-- 
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