From c59c5e9a6508d3a72fe058126482083ad2e5ceeb Mon Sep 17 00:00:00 2001
From: Tom Tromey <tromey@cygnus.com>
Date: Fri, 7 May 1999 17:39:52 +0000
Subject: * java/lang/natCharacter.cc (isLowerCase): Use a binary search.

From-SVN: r26829
---
 libjava/java/lang/natCharacter.cc | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

(limited to 'libjava/java')

diff --git a/libjava/java/lang/natCharacter.cc b/libjava/java/lang/natCharacter.cc
index 36cf570..fa312d1 100644
--- a/libjava/java/lang/natCharacter.cc
+++ b/libjava/java/lang/natCharacter.cc
@@ -152,12 +152,27 @@ java::lang::Character::isLowerCase (jchar ch)
   if (table_search (lower_case_table, asize (lower_case_table), ch) != -1)
     return true;
 
-  // FIXME: use a binary search.
-  for (unsigned int i = 0; i < asize (lower_anomalous_table); ++i)
+  int low, high, i, old;
+
+  low = 0;
+  high = asize (lower_anomalous_table);
+  i = high / 2;
+
+  while (true)
     {
-      if (lower_anomalous_table[i] == ch)
+      if (ch < lower_anomalous_table[i])
+	high = i;
+      else if (ch > lower_anomalous_table[i])
+	low = i;
+      else
 	return true;
+
+      old = i;
+      i = (high + low) / 2;
+      if (i == old)
+	break;
     }
+
   return false;
 }
 
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