From 38737268311efb7f5df89ed22dcc1ece823de032 Mon Sep 17 00:00:00 2001
From: Michael Ow <mow@svn.icu-project.org>
Date: Tue, 13 Sep 2011 21:13:14 +0000
Subject: [PATCH] ICU-8815 Sync the ICU canonical name lookup between ICU4C and
 ICU4J and update alias table

X-SVN-Rev: 30652
---
 icu4c/source/common/ucnv_io.cpp         | 29 ++++++++++++++++++++-----
 icu4c/source/data/mappings/convrtrs.txt |  2 +-
 2 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/icu4c/source/common/ucnv_io.cpp b/icu4c/source/common/ucnv_io.cpp
index 36d7f0ebdfd..b846cb0e2f9 100644
--- a/icu4c/source/common/ucnv_io.cpp
+++ b/icu4c/source/common/ucnv_io.cpp
@@ -749,13 +749,32 @@ findTaggedConverterNum(const char *alias, const char *standard, UErrorCode *pErr
 
 U_CFUNC const char *
 ucnv_io_getConverterName(const char *alias, UBool *containsOption, UErrorCode *pErrorCode) {
-    if(haveAliasData(pErrorCode) && isAlias(alias, pErrorCode)) {
-        uint32_t convNum = findConverter(alias, containsOption, pErrorCode);
-        if (convNum < gMainTable.converterListSize) {
-            return GET_STRING(gMainTable.converterList[convNum]);
+    const char *aliasTmp = alias;
+    int32_t i = 0;
+    for (i = 0; i < 2; i++) {
+        if (i == 1) {
+            /*
+             * After the first unsuccess converter lookup, check to see if
+             * the name begins with 'x-'. If it does, strip it off and try
+             * again.  This behaviour is similar to how ICU4J does it.
+             */
+            if (aliasTmp[0] == 'x' || aliasTmp[1] == '-') {
+                aliasTmp = aliasTmp+2;
+            } else {
+                break;
+            }
+        }
+        if(haveAliasData(pErrorCode) && isAlias(aliasTmp, pErrorCode)) {
+            uint32_t convNum = findConverter(aliasTmp, containsOption, pErrorCode);
+            if (convNum < gMainTable.converterListSize) {
+                return GET_STRING(gMainTable.converterList[convNum]);
+            }
+            /* else converter not found */
+        } else {
+            break;
         }
-        /* else converter not found */
     }
+
     return NULL;
 }
 
diff --git a/icu4c/source/data/mappings/convrtrs.txt b/icu4c/source/data/mappings/convrtrs.txt
index 6ce89ee7c3d..7bde6b8313e 100644
--- a/icu4c/source/data/mappings/convrtrs.txt
+++ b/icu4c/source/data/mappings/convrtrs.txt
@@ -931,7 +931,7 @@ macos-38_2-10.2 { UTR22* }      x-mac-romania { MIME* } x-MacRomania { JAVA* } M
 macos-518-10.2 { UTR22* }       x-mac-arabic { MIME* } x-MacArabic { JAVA* } MacArabic { JAVA }
 macos-1285-10.2 { UTR22* }      x-mac-hebrew { MIME* } x-MacHebrew { JAVA* } MacHebrew { JAVA }
 
-ibm-1051_P100-1995 { UTR22* }   ibm-1051 { IBM* } hp-roman8 { IANA* } roman8 { IANA } r8 { IANA } csHPRoman8 { IANA }   # HP Latin1
+ibm-1051_P100-1995 { UTR22* }   ibm-1051 { IBM* } hp-roman8 { IANA* } roman8 { IANA } r8 { IANA } csHPRoman8 { IANA } x-roman8 { JAVA}   # HP Latin1
 ibm-1276_P100-1995 { UTR22* }   ibm-1276 { IBM* } Adobe-Standard-Encoding { IANA* } csAdobeStandardEncoding { IANA } # Different from ISO-Unicode-IBM-1276 (GCSGID: 1276)
 
 ibm-1006_P100-1995 { UTR22* }   ibm-1006 { IBM* } IBM1006 { JAVA } cp1006 { JAVA* } 1006 { JAVA } x-IBM1006 { JAVA }  # Urdu
-- 
2.40.0