From 3fe96feba6db59b86db03c3530f2cffe7fe5bf1e Mon Sep 17 00:00:00 2001
From: Alan Liu <alansliu@gmail.com>
Date: Mon, 30 Jul 2001 23:22:51 +0000
Subject: [PATCH] ICU-1076 remove limit of 9 segments

X-SVN-Rev: 5378
---
 icu4c/source/i18n/rbt_data.cpp |  4 ++--
 icu4c/source/i18n/rbt_data.h   | 11 +++++++----
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/icu4c/source/i18n/rbt_data.cpp b/icu4c/source/i18n/rbt_data.cpp
index 0cef0ad2e1..5438e53c70 100644
--- a/icu4c/source/i18n/rbt_data.cpp
+++ b/icu4c/source/i18n/rbt_data.cpp
@@ -71,6 +71,6 @@ TransliterationRuleData::lookup(UChar32 standIn) const {
 
 int32_t
 TransliterationRuleData::lookupSegmentReference(UChar32 c) const {
-    int32_t i = c - segmentBase;
-    return (i >= 0 && i < 9) ? i : -1;
+    int32_t i = segmentBase - c;
+    return (i >= 0 && i < segmentCount) ? i : -1;
 }
diff --git a/icu4c/source/i18n/rbt_data.h b/icu4c/source/i18n/rbt_data.h
index c60e718c46..d677fbe11a 100644
--- a/icu4c/source/i18n/rbt_data.h
+++ b/icu4c/source/i18n/rbt_data.h
@@ -78,10 +78,13 @@ public:
 
     /**
      * The character that represents segment 1.  Characters segmentBase
-     * through segmentBase + 8 represent segments 1 through 9.
+     * through segmentBase - segmentCount + 1 represent segments 1
+     * through segmentCount.  Segments work down while variables work up.
      */
     UChar segmentBase;
 
+    int32_t segmentCount;
+
 public:
 
     TransliterationRuleData(UErrorCode& status);
@@ -99,16 +102,16 @@ public:
     /**
      * Return the zero-based index of the segment represented by the given
      * character, or -1 if none.  Repeat: This is a zero-based return value,
-     * 0..8, even though these are notated "$1".."$9".
+     * 0..n-1, even though these are notated "$1".."$n", where n is segmentCount.
      */
     int32_t lookupSegmentReference(UChar32 c) const;
 
     /**
      * Return the character used to stand for the given segment reference.
-     * The reference must be in the range 1..9.
+     * The reference must be in the range 1..segmentCount.
      */
     UChar getSegmentStandin(int32_t ref) const {
-        return (UChar)(segmentBase + ref - 1);
+        return (UChar)(segmentBase - ref + 1);
     }
 };