ICU 56 update step 1

source/common/ustr_imp.h

Index: source/common/ustr_imp.h
diff --git a/source/common/ustr_imp.h b/source/common/ustr_imp.h
index ee54d332ef04590796e0f7f2ea66aeedc8a3da28..a746016d2c2faff399757a4c3d5ef81bbd195ee5 100644
--- a/source/common/ustr_imp.h
+++ b/source/common/ustr_imp.h
@@ -1,6 +1,6 @@
 /*  
 **********************************************************************
-*   Copyright (C) 1999-2011, International Business Machines
+*   Copyright (C) 1999-2015, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 **********************************************************************
 *   file name:  ustr_imp.h
@@ -63,6 +63,25 @@ u_strcmpFold(const UChar *s1, int32_t length1,
              UErrorCode *pErrorCode);
 
 /**
+ * Interanl API, used for detecting length of
+ * shared prefix case-insensitively.
+ * @param s1            input string 1
+ * @param length1       length of string 1, or -1 (NULL terminated)
+ * @param s2            input string 2
+ * @param length2       length of string 2, or -1 (NULL terminated)
+ * @param options       compare options
+ * @param matchLen1     (output) length of partial prefix match in s1
+ * @param matchLen2     (output) length of partial prefix match in s2
+ * @param pErrorCode    receives error status
+ */
+U_CAPI void
+u_caseInsensitivePrefixMatch(const UChar *s1, int32_t length1,
+                             const UChar *s2, int32_t length2,
+                             uint32_t options,
+                             int32_t *matchLen1, int32_t *matchLen2,
+                             UErrorCode *pErrorCode);
+
+/**
  * Are the Unicode properties loaded?
  * This must be used before internal functions are called that do
  * not perform this check.