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 // © 2016 and later: Unicode, Inc. and others.
 // License & terms of use: http://www.unicode.org/copyright.html
 /*
 **********************************************************************
 *   Copyright (C) 1997-2016, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 **********************************************************************
 *
 * File ULOC.H
 *
 * Modification History:
 *
 *   Date        Name        Description
 *   04/01/97    aliu        Creation.
 *   08/22/98    stephen     JDK 1.2 sync.
 *   12/08/98    rtg         New C API for Locale
 *   03/30/99    damiba      overhaul
 *   03/31/99    helena      Javadoc for uloc functions.
 *   04/15/99    Madhu       Updated Javadoc
 ********************************************************************************
 */
 
 #ifndef ULOC_H
 #define ULOC_H
 
 #include "unicode/utypes.h"
 #include "unicode/uenum.h"
 
 /**
  * \file
  * \brief C API: Locale ID functionality similar to C++ class Locale
  *
  * <h2> ULoc C API for Locale </h2>
  * A <code>Locale</code> represents a specific geographical, political,
  * or cultural region. An operation that requires a <code>Locale</code> to perform
  * its task is called <em>locale-sensitive</em> and uses the <code>Locale</code>
  * to tailor information for the user. For example, displaying a number
  * is a locale-sensitive operation--the number should be formatted
  * according to the customs/conventions of the user's native country,
  * region, or culture.  In the C APIs, a locales is simply a const char string.
  *
  * <P>
  * You create a <code>Locale</code> with one of the three options listed below.
  * Each of the component is separated by '_' in the locale string.
  * \htmlonly<blockquote>\endhtmlonly
  * <pre>
  * \code
  *       newLanguage
  * 
  *       newLanguage + newCountry
  * 
  *       newLanguage + newCountry + newVariant
  * \endcode
  * </pre>
  * \htmlonly</blockquote>\endhtmlonly
  * The first option is a valid <STRONG>ISO
  * Language Code.</STRONG> These codes are the lower-case two-letter
  * codes as defined by ISO-639.
  * You can find a full list of these codes at a number of sites, such as:
  * <BR><a href ="http://www.ics.uci.edu/pub/ietf/http/related/iso639.txt">
  * http://www.ics.uci.edu/pub/ietf/http/related/iso639.txt</a>
  *
  * <P>
  * The second option includes an additional <STRONG>ISO Country
  * Code.</STRONG> These codes are the upper-case two-letter codes
  * as defined by ISO-3166.
  * You can find a full list of these codes at a number of sites, such as:
  * <BR><a href="http://www.chemie.fu-berlin.de/diverse/doc/ISO_3166.html">
  * http://www.chemie.fu-berlin.de/diverse/doc/ISO_3166.html</a>
  *
  * <P>
  * The third option requires another additional information--the 
  * <STRONG>Variant.</STRONG>
  * The Variant codes are vendor and browser-specific.
  * For example, use WIN for Windows, MAC for Macintosh, and POSIX for POSIX.
  * Where there are two variants, separate them with an underscore, and
  * put the most important one first. For
  * example, a Traditional Spanish collation might be referenced, with
  * "ES", "ES", "Traditional_WIN".
  *
  * <P>
  * Because a <code>Locale</code> is just an identifier for a region,
  * no validity check is performed when you specify a <code>Locale</code>.
  * If you want to see whether particular resources are available for the
  * <code>Locale</code> you asked for, you must query those resources. For
  * example, ask the <code>UNumberFormat</code> for the locales it supports
  * using its <code>getAvailable</code> method.
  * <BR><STRONG>Note:</STRONG> When you ask for a resource for a particular
  * locale, you get back the best available match, not necessarily
  * precisely what you asked for. For more information, look at
  * <code>UResourceBundle</code>.
  *
  * <P>
  * The <code>Locale</code> provides a number of convenient constants
  * that you can use to specify the commonly used
  * locales. For example, the following refers to a locale
  * for the United States:
  * \htmlonly<blockquote>\endhtmlonly
  * <pre>
  * \code
  *       ULOC_US
  * \endcode
  * </pre>
  * \htmlonly</blockquote>\endhtmlonly
  *
  * <P>
  * Once you've specified a locale you can query it for information about
  * itself. Use <code>uloc_getCountry</code> to get the ISO Country Code and
  * <code>uloc_getLanguage</code> to get the ISO Language Code. You can
  * use <code>uloc_getDisplayCountry</code> to get the
  * name of the country suitable for displaying to the user. Similarly,
  * you can use <code>uloc_getDisplayLanguage</code> to get the name of
  * the language suitable for displaying to the user. Interestingly,
  * the <code>uloc_getDisplayXXX</code> methods are themselves locale-sensitive
  * and have two versions: one that uses the default locale and one
  * that takes a locale as an argument and displays the name or country in
  * a language appropriate to that locale.
  *
  * <P>
  * The ICU provides a number of services that perform locale-sensitive
  * operations. For example, the <code>unum_xxx</code> functions format
  * numbers, currency, or percentages in a locale-sensitive manner. 
  * </P>
  * \htmlonly<blockquote>\endhtmlonly
  * <pre>
  * \code
  *     UErrorCode success = U_ZERO_ERROR;
  *     UNumberFormat *nf;
  *     const char* myLocale = "fr_FR";
  * 
  *     nf = unum_open( UNUM_DEFAULT, NULL, success );          
  *     unum_close(nf);
  *     nf = unum_open( UNUM_CURRENCY, NULL, success );
  *     unum_close(nf);
  *     nf = unum_open( UNUM_PERCENT, NULL, success );   
  *     unum_close(nf);
  * \endcode
  * </pre>
  * \htmlonly</blockquote>\endhtmlonly
  * Each of these methods has two variants; one with an explicit locale
  * and one without; the latter using the default locale.
  * \htmlonly<blockquote>\endhtmlonly
  * <pre>
  * \code 
  * 
  *     nf = unum_open( UNUM_DEFAULT, myLocale, success );          
  *     unum_close(nf);
  *     nf = unum_open( UNUM_CURRENCY, myLocale, success );
  *     unum_close(nf);
  *     nf = unum_open( UNUM_PERCENT, myLocale, success );   
  *     unum_close(nf);
  * \endcode
  * </pre>
  * \htmlonly</blockquote>\endhtmlonly
  * A <code>Locale</code> is the mechanism for identifying the kind of services
  * (<code>UNumberFormat</code>) that you would like to get. The locale is
  * <STRONG>just</STRONG> a mechanism for identifying these services.
  *
  * <P>
  * Each international service that performs locale-sensitive operations 
  * allows you
  * to get all the available objects of that type. You can sift
  * through these objects by language, country, or variant,
  * and use the display names to present a menu to the user.
  * For example, you can create a menu of all the collation objects
  * suitable for a given language. Such classes implement these
  * three class methods:
  * \htmlonly<blockquote>\endhtmlonly
  * <pre>
  * \code
  *       const char* uloc_getAvailable(int32_t index);
  *       int32_t uloc_countAvailable();
  *       int32_t
  *       uloc_getDisplayName(const char* localeID,
  *                 const char* inLocaleID, 
  *                 UChar* result,
  *                 int32_t maxResultSize,
  *                  UErrorCode* err);
  * 
  * \endcode
  * </pre>
  * \htmlonly</blockquote>\endhtmlonly
  * <P>
  * Concerning POSIX/RFC1766 Locale IDs, 
  *  the getLanguage/getCountry/getVariant/getName functions do understand
  * the POSIX type form of  language_COUNTRY.ENCODING\@VARIANT
  * and if there is not an ICU-stype variant, uloc_getVariant() for example
  * will return the one listed after the \@at sign. As well, the hyphen
  * "-" is recognized as a country/variant separator similarly to RFC1766.
  * So for example, "en-us" will be interpreted as en_US.  
  * As a result, uloc_getName() is far from a no-op, and will have the
  * effect of converting POSIX/RFC1766 IDs into ICU form, although it does
  * NOT map any of the actual codes (i.e. russian->ru) in any way.
  * Applications should call uloc_getName() at the point where a locale ID
  * is coming from an external source (user entry, OS, web browser)
  * and pass the resulting string to other ICU functions.  For example,
  * don't use de-de\@EURO as an argument to resourcebundle.
  *
  * @see UResourceBundle
  */
 
 /** Useful constant for this language. @stable ICU 2.0 */
 #define ULOC_CHINESE            "zh"
 /** Useful constant for this language. @stable ICU 2.0 */
 #define ULOC_ENGLISH            "en"
 /** Useful constant for this language. @stable ICU 2.0 */
 #define ULOC_FRENCH             "fr"
 /** Useful constant for this language. @stable ICU 2.0 */
 #define ULOC_GERMAN             "de"
 /** Useful constant for this language. @stable ICU 2.0 */
 #define ULOC_ITALIAN            "it"
 /** Useful constant for this language. @stable ICU 2.0 */
 #define ULOC_JAPANESE           "ja"
 /** Useful constant for this language. @stable ICU 2.0 */
 #define ULOC_KOREAN             "ko"
 /** Useful constant for this language. @stable ICU 2.0 */
 #define ULOC_SIMPLIFIED_CHINESE "zh_CN"
 /** Useful constant for this language. @stable ICU 2.0 */
 #define ULOC_TRADITIONAL_CHINESE "zh_TW"
 
 /** Useful constant for this country/region. @stable ICU 2.0 */
 #define ULOC_CANADA         "en_CA"
 /** Useful constant for this country/region. @stable ICU 2.0 */
 #define ULOC_CANADA_FRENCH  "fr_CA"
 /** Useful constant for this country/region. @stable ICU 2.0 */
 #define ULOC_CHINA          "zh_CN"
 /** Useful constant for this country/region. @stable ICU 2.0 */
 #define ULOC_PRC            "zh_CN"
 /** Useful constant for this country/region. @stable ICU 2.0 */
 #define ULOC_FRANCE         "fr_FR"
 /** Useful constant for this country/region. @stable ICU 2.0 */
 #define ULOC_GERMANY        "de_DE"
 /** Useful constant for this country/region. @stable ICU 2.0 */
 #define ULOC_ITALY          "it_IT"
 /** Useful constant for this country/region. @stable ICU 2.0 */
 #define ULOC_JAPAN          "ja_JP"
 /** Useful constant for this country/region. @stable ICU 2.0 */
 #define ULOC_KOREA          "ko_KR"
 /** Useful constant for this country/region. @stable ICU 2.0 */
 #define ULOC_TAIWAN         "zh_TW"
 /** Useful constant for this country/region. @stable ICU 2.0 */
 #define ULOC_UK             "en_GB"
 /** Useful constant for this country/region. @stable ICU 2.0 */
 #define ULOC_US             "en_US"
 
 /**
  * Useful constant for the maximum size of the language part of a locale ID.
  * (including the terminating NULL).
  * @stable ICU 2.0
  */
 #define ULOC_LANG_CAPACITY 12
 
 /**
  * Useful constant for the maximum size of the country part of a locale ID
  * (including the terminating NULL).
  * @stable ICU 2.0
  */
 #define ULOC_COUNTRY_CAPACITY 4
 /**
  * Useful constant for the maximum size of the whole locale ID
  * (including the terminating NULL and all keywords).
  * @stable ICU 2.0
  */
 #define ULOC_FULLNAME_CAPACITY 157
 
 /**
  * Useful constant for the maximum size of the script part of a locale ID
  * (including the terminating NULL).
  * @stable ICU 2.8
  */
 #define ULOC_SCRIPT_CAPACITY 6
 
 /**
  * Useful constant for the maximum size of keywords in a locale
  * @stable ICU 2.8
  */
 #define ULOC_KEYWORDS_CAPACITY 96
 
 /**
  * Useful constant for the maximum total size of keywords and their values in a locale
  * @stable ICU 2.8
  */
 #define ULOC_KEYWORD_AND_VALUES_CAPACITY 100
 
 /**
  * Invariant character separating keywords from the locale string
  * @stable ICU 2.8
  */
 #define ULOC_KEYWORD_SEPARATOR '@'
 
 /**
   * Unicode code point for '@' separating keywords from the locale string.
   * @see ULOC_KEYWORD_SEPARATOR
   * @stable ICU 4.6
   */
 #define ULOC_KEYWORD_SEPARATOR_UNICODE 0x40
 
 /**
  * Invariant character for assigning value to a keyword
  * @stable ICU 2.8
  */
 #define ULOC_KEYWORD_ASSIGN '='
 
 /**
   * Unicode code point for '=' for assigning value to a keyword.
   * @see ULOC_KEYWORD_ASSIGN
   * @stable ICU 4.6 
   */
 #define ULOC_KEYWORD_ASSIGN_UNICODE 0x3D
 
 /**
  * Invariant character separating keywords
  * @stable ICU 2.8
  */
 #define ULOC_KEYWORD_ITEM_SEPARATOR ';'
 
 /**
   * Unicode code point for ';' separating keywords
   * @see ULOC_KEYWORD_ITEM_SEPARATOR
   * @stable ICU 4.6
   */
 #define ULOC_KEYWORD_ITEM_SEPARATOR_UNICODE 0x3B
 
 /**
  * Constants for *_getLocale()
  * Allow user to select whether she wants information on 
  * requested, valid or actual locale.
  * For example, a collator for "en_US_CALIFORNIA" was
  * requested. In the current state of ICU (2.0), 
  * the requested locale is "en_US_CALIFORNIA",
  * the valid locale is "en_US" (most specific locale supported by ICU)
  * and the actual locale is "root" (the collation data comes unmodified 
  * from the UCA)
  * The locale is considered supported by ICU if there is a core ICU bundle 
  * for that locale (although it may be empty).
  * @stable ICU 2.1
  */
 typedef enum {
   /** This is locale the data actually comes from 
    * @stable ICU 2.1
    */
   ULOC_ACTUAL_LOCALE    = 0,
   /** This is the most specific locale supported by ICU 
    * @stable ICU 2.1
    */
   ULOC_VALID_LOCALE    = 1,
 
 #ifndef U_HIDE_DEPRECATED_API
   /** This is the requested locale
    *  @deprecated ICU 2.8 
    */
   ULOC_REQUESTED_LOCALE = 2,
 
     /**
      * One more than the highest normal ULocDataLocaleType value.
      * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
      */
     ULOC_DATA_LOCALE_TYPE_LIMIT = 3
 #endif  // U_HIDE_DEPRECATED_API
 } ULocDataLocaleType;
 
 #ifndef U_HIDE_SYSTEM_API
 /**
  * Gets ICU's default locale.  
  * The returned string is a snapshot in time, and will remain valid
  *   and unchanged even when uloc_setDefault() is called.
  *   The returned storage is owned by ICU, and must not be altered or deleted
  *   by the caller.
  *  
  * @return the ICU default locale
  * @system
  * @stable ICU 2.0
  */
 U_CAPI const char* U_EXPORT2
 uloc_getDefault(void);
 
 /**
  * Sets ICU's default locale.  
  *    By default (without calling this function), ICU's default locale will be based
  *    on information obtained from the underlying system environment.
  *    <p>
  *    Changes to ICU's default locale do not propagate back to the
  *    system environment.
  *    <p>
  *    Changes to ICU's default locale to not affect any ICU services that
  *    may already be open based on the previous default locale value.
  *
  * @param localeID the new ICU default locale. A value of NULL will try to get
  *                 the system's default locale.
  * @param status the error information if the setting of default locale fails
  * @system
  * @stable ICU 2.0
  */
 U_CAPI void U_EXPORT2
 uloc_setDefault(const char* localeID,
         UErrorCode*       status);
 #endif  /* U_HIDE_SYSTEM_API */
 
 /**
  * Gets the language code for the specified locale.
  *
  * This function may return with a failure error code for certain kinds of inputs
  * but does not fully check for well-formed locale IDs / language tags.
  *
  * @param localeID the locale to get the ISO language code with
  * @param language the language code for localeID
  * @param languageCapacity the size of the language buffer to store the  
  * language code with
  * @param err error information if retrieving the language code failed
  * @return the actual buffer size needed for the language code.  If it's greater 
  * than languageCapacity, the returned language code will be truncated.  
  * @stable ICU 2.0
  */
 U_CAPI int32_t U_EXPORT2
 uloc_getLanguage(const char*    localeID,
          char* language,
          int32_t languageCapacity,
          UErrorCode* err);
 
 /**
  * Gets the script code for the specified locale.
  *
  * This function may return with a failure error code for certain kinds of inputs
  * but does not fully check for well-formed locale IDs / language tags.
  *
  * @param localeID the locale to get the ISO language code with
  * @param script the language code for localeID
  * @param scriptCapacity the size of the language buffer to store the  
  * language code with
  * @param err error information if retrieving the language code failed
  * @return the actual buffer size needed for the language code.  If it's greater 
  * than scriptCapacity, the returned language code will be truncated.  
  * @stable ICU 2.8
  */
 U_CAPI int32_t U_EXPORT2
 uloc_getScript(const char*    localeID,
          char* script,
          int32_t scriptCapacity,
          UErrorCode* err);
 
 /**
  * Gets the  country code for the specified locale.
  *
  * This function may return with a failure error code for certain kinds of inputs
  * but does not fully check for well-formed locale IDs / language tags.
  *
  * @param localeID the locale to get the country code with
  * @param country the country code for localeID
  * @param countryCapacity the size of the country buffer to store the  
  * country code with
  * @param err error information if retrieving the country code failed
  * @return the actual buffer size needed for the country code.  If it's greater 
  * than countryCapacity, the returned country code will be truncated.  
  * @stable ICU 2.0
  */
 U_CAPI int32_t U_EXPORT2
 uloc_getCountry(const char*    localeID,
         char* country,
         int32_t countryCapacity,
         UErrorCode* err);
 
 /**
  * Gets the variant code for the specified locale.
  *
  * This function may return with a failure error code for certain kinds of inputs
  * but does not fully check for well-formed locale IDs / language tags.
  *
  * @param localeID the locale to get the variant code with
  * @param variant the variant code for localeID
  * @param variantCapacity the size of the variant buffer to store the 
  * variant code with
  * @param err error information if retrieving the variant code failed
  * @return the actual buffer size needed for the variant code.  If it's greater 
  * than variantCapacity, the returned variant code will be truncated.  
  * @stable ICU 2.0
  */
 U_CAPI int32_t U_EXPORT2
 uloc_getVariant(const char*    localeID,
         char* variant,
         int32_t variantCapacity,
         UErrorCode* err);
 
 
 /**
  * Gets the full name for the specified locale.
  *
  * This function may return with a failure error code for certain kinds of inputs
  * but does not fully check for well-formed locale IDs / language tags.
  *
  * Note: This has the effect of 'canonicalizing' the ICU locale ID to
  * a certain extent. Upper and lower case are set as needed.
  * It does NOT map aliased names in any way.
  * See the top of this header file.
  * This API supports preflighting.
  *
  * @param localeID the locale to get the full name with
  * @param name fill in buffer for the name without keywords.
  * @param nameCapacity capacity of the fill in buffer.
  * @param err error information if retrieving the full name failed
  * @return the actual buffer size needed for the full name.  If it's greater 
  * than nameCapacity, the returned full name will be truncated.  
  * @stable ICU 2.0
  */
 U_CAPI int32_t U_EXPORT2
 uloc_getName(const char*    localeID,
          char* name,
          int32_t nameCapacity,
          UErrorCode* err);
 
 /**
  * Gets the full name for the specified locale.
  * Note: This has the effect of 'canonicalizing' the string to
  * a certain extent. Upper and lower case are set as needed,
  * and if the components were in 'POSIX' format they are changed to
  * ICU format.  It does NOT map aliased names in any way.
  * See the top of this header file.
  *
  * @param localeID the locale to get the full name with
  * @param name the full name for localeID
  * @param nameCapacity the size of the name buffer to store the 
  * full name with
  * @param err error information if retrieving the full name failed
  * @return the actual buffer size needed for the full name.  If it's greater 
  * than nameCapacity, the returned full name will be truncated.  
  * @stable ICU 2.8
  */
 U_CAPI int32_t U_EXPORT2
 uloc_canonicalize(const char*    localeID,
          char* name,
          int32_t nameCapacity,
          UErrorCode* err);
 
 /**
  * Gets the ISO language code for the specified locale.
  *
  * @param localeID the locale to get the ISO language code with
  * @return language the ISO language code for localeID
  * @stable ICU 2.0
  */
 U_CAPI const char* U_EXPORT2
 uloc_getISO3Language(const char* localeID);
 
 
 /**
  * Gets the ISO country code for the specified locale.
  *
  * @param localeID the locale to get the ISO country code with
  * @return country the ISO country code for localeID
  * @stable ICU 2.0
  */
 U_CAPI const char* U_EXPORT2
 uloc_getISO3Country(const char* localeID);
 
 /**
  * Gets the Win32 LCID value for the specified locale.
  * If the ICU locale is not recognized by Windows, 0 will be returned.
  *
  * LCIDs were deprecated with Windows Vista and Microsoft recommends
  * that developers use BCP47 style tags instead (uloc_toLanguageTag).
  *
  * @param localeID the locale to get the Win32 LCID value with
  * @return country the Win32 LCID for localeID
  * @stable ICU 2.0
  */
 U_CAPI uint32_t U_EXPORT2
 uloc_getLCID(const char* localeID);
 
 /**
  * Gets the language name suitable for display for the specified locale.
  *
  * @param locale the locale to get the ISO language code with
  * @param displayLocale Specifies the locale to be used to display the name. In
  *                 other words, if the locale's language code is "en", passing
  *                 Locale::getFrench() for inLocale would result in "Anglais",
  *                 while passing Locale::getGerman() for inLocale would result
  *                 in "Englisch".
  * @param language the displayable language code for localeID
  * @param languageCapacity the size of the language buffer to store the
  *                 displayable language code with.
  * @param status error information if retrieving the displayable language code
  *                 failed. U_USING_DEFAULT_WARNING indicates that no data was
  *                 found from the locale resources and a case canonicalized
  *                 language code is placed into language as fallback.
  * @return the actual buffer size needed for the displayable language code. If
  *                 it's greater than languageCapacity, the returned language
  *                 code will be truncated.
  * @stable ICU 2.0
  */
 U_CAPI int32_t U_EXPORT2
 uloc_getDisplayLanguage(const char* locale,
             const char* displayLocale,
             UChar* language,
             int32_t languageCapacity,
             UErrorCode* status);
 
 /**
  * Gets the script name suitable for display for the specified locale.
  *
  * @param locale the locale to get the displayable script code with. NULL may be
  *                 used to specify the default.
  * @param displayLocale Specifies the locale to be used to display the name. In
  *                 other words, if the locale's language code is "en", passing
  *                 Locale::getFrench() for inLocale would result in "", while
  *                 passing Locale::getGerman() for inLocale would result in "".
  *                 NULL may be used to specify the default.
  * @param script the displayable script for the localeID.
  * @param scriptCapacity the size of the script buffer to store the displayable
  *                 script code with.
  * @param status error information if retrieving the displayable script code
  *                 failed. U_USING_DEFAULT_WARNING indicates that no data was
  *                 found from the locale resources and a case canonicalized
  *                 script code is placed into script as fallback.
  * @return the actual buffer size needed for the displayable script code. If
  *                 it's greater than scriptCapacity, the returned displayable
  *                 script code will be truncated.
  * @stable ICU 2.8
  */
 U_CAPI int32_t U_EXPORT2
 uloc_getDisplayScript(const char* locale,
             const char* displayLocale,
             UChar* script,
             int32_t scriptCapacity,
             UErrorCode* status);
 
 /**
  * Gets the country name suitable for display for the specified locale.
  * Warning: this is for the region part of a valid locale ID; it cannot just be
  * the region code (like "FR"). To get the display name for a region alone, or
  * for other options, use ULocaleDisplayNames instead.
  *
  * @param locale the locale to get the displayable country code with. NULL may
  *                 be used to specify the default.
  * @param displayLocale Specifies the locale to be used to display the name. In
  *                 other words, if the locale's language code is "en", passing
  *                 Locale::getFrench() for inLocale would result in "Anglais",
  *                 while passing Locale::getGerman() for inLocale would result
  *                 in "Englisch". NULL may be used to specify the default.
  * @param country the displayable country code for localeID.
  * @param countryCapacity the size of the country buffer to store the
  *                 displayable country code with.
  * @param status error information if retrieving the displayable country code
  *                 failed. U_USING_DEFAULT_WARNING indicates that no data was
  *                 found from the locale resources and a case canonicalized
  *                 country code is placed into country as fallback.
  * @return the actual buffer size needed for the displayable country code. If
  *                 it's greater than countryCapacity, the returned displayable
  *                 country code will be truncated.
  * @stable ICU 2.0
  */
 U_CAPI int32_t U_EXPORT2
 uloc_getDisplayCountry(const char* locale,
                        const char* displayLocale,
                        UChar* country,
                        int32_t countryCapacity,
                        UErrorCode* status);
 
 
 /**
  * Gets the variant name suitable for display for the specified locale.
  *
  * @param locale the locale to get the displayable variant code with. NULL may
  *                 be used to specify the default.
  * @param displayLocale Specifies the locale to be used to display the name. In
  *                 other words, if the locale's language code is "en", passing
  *                 Locale::getFrench() for inLocale would result in "Anglais",
  *                 while passing Locale::getGerman() for inLocale would result
  *                 in "Englisch". NULL may be used to specify the default.
  * @param variant the displayable variant code for localeID.
  * @param variantCapacity the size of the variant buffer to store the
  *                 displayable variant code with.
  * @param status error information if retrieving the displayable variant code
  *                 failed. U_USING_DEFAULT_WARNING indicates that no data was
  *                 found from the locale resources and a case canonicalized
  *                 variant code is placed into variant as fallback.
  * @return the actual buffer size needed for the displayable variant code. If
  *                 it's greater than variantCapacity, the returned displayable
  *                 variant code will be truncated.
  * @stable ICU 2.0
  */
 U_CAPI int32_t U_EXPORT2
 uloc_getDisplayVariant(const char* locale,
                        const char* displayLocale,
                        UChar* variant,
                        int32_t variantCapacity,
                        UErrorCode* status);
 
 /**
  * Gets the keyword name suitable for display for the specified locale. E.g:
  * for the locale string de_DE\@collation=PHONEBOOK, this API gets the display
  * string for the keyword collation.
  * Usage:
  * <code>
  *    UErrorCode status = U_ZERO_ERROR;
  *    const char* keyword =NULL;
  *    int32_t keywordLen = 0;
  *    int32_t keywordCount = 0;
  *    UChar displayKeyword[256];
  *    int32_t displayKeywordLen = 0;
  *    UEnumeration* keywordEnum = uloc_openKeywords("de_DE@collation=PHONEBOOK;calendar=TRADITIONAL", &status);
  *    for(keywordCount = uenum_count(keywordEnum, &status); keywordCount > 0 ; keywordCount--){
  *          if(U_FAILURE(status)){
  *              ...something went wrong so handle the error...
  *              break;
  *          }
  *          // the uenum_next returns NUL terminated string
  *          keyword = uenum_next(keywordEnum, &keywordLen, &status);
  *          displayKeywordLen = uloc_getDisplayKeyword(keyword, "en_US", displayKeyword, 256);
  *          ... do something interesting .....
  *    }
  *    uenum_close(keywordEnum);
  * </code>
  * @param keyword           The keyword whose display string needs to be returned.
  * @param displayLocale     Specifies the locale to be used to display the name.  In other words,
  *                          if the locale's language code is "en", passing Locale::getFrench() for
  *                          inLocale would result in "Anglais", while passing Locale::getGerman()
  *                          for inLocale would result in "Englisch". NULL may be used to specify the default.
  * @param dest              the buffer to which the displayable keyword should be written.
  * @param destCapacity      The size of the buffer (number of UChars). If it is 0, then
  *                          dest may be NULL and the function will only return the length of the
  *                          result without writing any of the result string (pre-flighting).
  * @param status            error information if retrieving the displayable string failed.
  *                          Should not be NULL and should not indicate failure on entry.
  *                          U_USING_DEFAULT_WARNING indicates that no data was found from the locale
  *                          resources and the keyword is placed into dest as fallback.
  * @return the actual buffer size needed for the displayable variant code.
  * @see #uloc_openKeywords
  * @stable ICU 2.8
  */
 U_CAPI int32_t U_EXPORT2
 uloc_getDisplayKeyword(const char* keyword,
                        const char* displayLocale,
                        UChar* dest,
                        int32_t destCapacity,
                        UErrorCode* status);
 /**
  * Gets the value of the keyword suitable for display for the specified locale.
  * E.g: for the locale string de_DE\@collation=PHONEBOOK, this API gets the display
  * string for PHONEBOOK, in the display locale, when "collation" is specified as the keyword.
  *
  * @param locale            The locale to get the displayable variant code with. NULL may be used to specify the default.
  * @param keyword           The keyword for whose value should be used.
  * @param displayLocale     Specifies the locale to be used to display the name.  In other words,
  *                          if the locale's language code is "en", passing Locale::getFrench() for
  *                          inLocale would result in "Anglais", while passing Locale::getGerman()
  *                          for inLocale would result in "Englisch". NULL may be used to specify the default.
  * @param dest              the buffer to which the displayable keyword should be written.
  * @param destCapacity      The size of the buffer (number of UChars). If it is 0, then
  *                          dest may be NULL and the function will only return the length of the
  *                          result without writing any of the result string (pre-flighting).
  * @param status            error information if retrieving the displayable string failed.
  *                          Should not be NULL and must not indicate failure on entry.
  *                          U_USING_DEFAULT_WARNING indicates that no data was found from the locale
  *                          resources and the value of the keyword is placed into dest as fallback.
  * @return the actual buffer size needed for the displayable variant code.
  * @stable ICU 2.8
  */
 U_CAPI int32_t U_EXPORT2
 uloc_getDisplayKeywordValue(   const char* locale,
                                const char* keyword,
                                const char* displayLocale,
                                UChar* dest,
                                int32_t destCapacity,
                                UErrorCode* status);
 /**
  * Gets the full name suitable for display for the specified locale.
  *
  * @param localeID the locale to get the displayable name with. NULL may be used to specify the default.
  * @param inLocaleID Specifies the locale to be used to display the name.  In other words,
  *                   if the locale's language code is "en", passing Locale::getFrench() for
  *                   inLocale would result in "Anglais", while passing Locale::getGerman()
  *                   for inLocale would result in "Englisch". NULL may be used to specify the default.
  * @param result the displayable name for localeID
  * @param maxResultSize the size of the name buffer to store the 
  * displayable full name with
  * @param err error information if retrieving the displayable name failed
  * @return the actual buffer size needed for the displayable name.  If it's greater 
  * than maxResultSize, the returned displayable name will be truncated.  
  * @stable ICU 2.0
  */
 U_CAPI int32_t U_EXPORT2
 uloc_getDisplayName(const char* localeID,
             const char* inLocaleID,
             UChar* result,
             int32_t maxResultSize,
             UErrorCode* err);
 
 
 /**
  * Gets the specified locale from a list of available locales.
  *
  * This method corresponds to uloc_openAvailableByType called with the
  * ULOC_AVAILABLE_DEFAULT type argument.
  *
  * The return value is a pointer to an item of a locale name array. Both this
  * array and the pointers it contains are owned by ICU and should not be
  * deleted or written through by the caller. The locale name is terminated by
  * a null pointer.
  *
  * @param n the specific locale name index of the available locale list;
  *     should not exceed the number returned by uloc_countAvailable.
  * @return a specified locale name of all available locales
  * @stable ICU 2.0
  */
 U_CAPI const char* U_EXPORT2
 uloc_getAvailable(int32_t n);
 
 /**
  * Gets the size of the all available locale list.
  *
  * @return the size of the locale list
  * @stable ICU 2.0
  */
 U_CAPI int32_t U_EXPORT2 uloc_countAvailable(void);
 
 /**
  * Types for uloc_getAvailableByType and uloc_countAvailableByType.
  *
  * @stable ICU 65
  */
 typedef enum ULocAvailableType {
   /**
    * Locales that return data when passed to ICU APIs,
    * but not including legacy or alias locales.
    *
    * @stable ICU 65
    */
   ULOC_AVAILABLE_DEFAULT,
 
   /**
    * Legacy or alias locales that return data when passed to ICU APIs.
    * Examples of supported legacy or alias locales:
    *
    * - iw (alias to he)
    * - mo (alias to ro)
    * - zh_CN (alias to zh_Hans_CN)
    * - sr_BA (alias to sr_Cyrl_BA)
    * - ars (alias to ar_SA)
    *
    * The locales in this set are disjoint from the ones in
    * ULOC_AVAILABLE_DEFAULT. To get both sets at the same time, use
    * ULOC_AVAILABLE_WITH_LEGACY_ALIASES.
    *
    * @stable ICU 65
    */
   ULOC_AVAILABLE_ONLY_LEGACY_ALIASES,
 
   /**
    * The union of the locales in ULOC_AVAILABLE_DEFAULT and
    * ULOC_AVAILABLE_ONLY_LEGACY_ALIAS.
    *
    * @stable ICU 65
    */
   ULOC_AVAILABLE_WITH_LEGACY_ALIASES,
 
 #ifndef U_HIDE_INTERNAL_API
   /**
    * @internal
    */
   ULOC_AVAILABLE_COUNT
 #endif  /* U_HIDE_INTERNAL_API */
 } ULocAvailableType;
 
 /**
  * Gets a list of available locales according to the type argument, allowing
  * the user to access different sets of supported locales in ICU.
  *
  * The returned UEnumeration must be closed by the caller.
  *
  * @param type Type choice from ULocAvailableType.
  * @param status Set if an error occurred.
  * @return a UEnumeration owned by the caller, or nullptr on failure.
  * @stable ICU 65
  */
 U_CAPI UEnumeration* U_EXPORT2
 uloc_openAvailableByType(ULocAvailableType type, UErrorCode* status);
 
 /**
  *
  * Gets a list of all available 2-letter language codes defined in ISO 639,
  * plus additional 3-letter codes determined to be useful for locale generation as
  * defined by Unicode CLDR. This is a pointer
  * to an array of pointers to arrays of char.  All of these pointers are owned
  * by ICU-- do not delete them, and do not write through them.  The array is
  * terminated with a null pointer.
  * @return a list of all available language codes
  * @stable ICU 2.0
  */
 U_CAPI const char* const* U_EXPORT2
 uloc_getISOLanguages(void);
 
 /**
  *
  * Gets a list of all available 2-letter country codes defined in ISO 639.  This is a
  * pointer to an array of pointers to arrays of char.  All of these pointers are
  * owned by ICU-- do not delete them, and do not write through them.  The array is
  * terminated with a null pointer.
  * @return a list of all available country codes
  * @stable ICU 2.0
  */
 U_CAPI const char* const* U_EXPORT2
 uloc_getISOCountries(void);
 
 /**
  * Truncate the locale ID string to get the parent locale ID.
  * Copies the part of the string before the last underscore.
  * The parent locale ID will be an empty string if there is no
  * underscore, or if there is only one underscore at localeID[0].
  *
  * @param localeID Input locale ID string.
  * @param parent   Output string buffer for the parent locale ID.
  * @param parentCapacity Size of the output buffer.
  * @param err A UErrorCode value.
  * @return The length of the parent locale ID.
  * @stable ICU 2.0
  */
 U_CAPI int32_t U_EXPORT2
 uloc_getParent(const char*    localeID,
                  char* parent,
                  int32_t parentCapacity,
                  UErrorCode* err);
 
 
 
 
 /**
  * Gets the full name for the specified locale, like uloc_getName(),
  * but without keywords.
  *
  * Note: This has the effect of 'canonicalizing' the string to
  * a certain extent. Upper and lower case are set as needed,
  * and if the components were in 'POSIX' format they are changed to
  * ICU format.  It does NOT map aliased names in any way.
  * See the top of this header file.
  *
  * This API strips off the keyword part, so "de_DE\@collation=phonebook" 
  * will become "de_DE". 
  * This API supports preflighting.
  *
  * @param localeID the locale to get the full name with
  * @param name fill in buffer for the name without keywords.
  * @param nameCapacity capacity of the fill in buffer.
  * @param err error information if retrieving the full name failed
  * @return the actual buffer size needed for the full name.  If it's greater 
  * than nameCapacity, the returned full name will be truncated.  
  * @stable ICU 2.8
  */
 U_CAPI int32_t U_EXPORT2
 uloc_getBaseName(const char*    localeID,
          char* name,
          int32_t nameCapacity,
          UErrorCode* err);
 
 /**
  * Gets an enumeration of keywords for the specified locale. Enumeration
  * must get disposed of by the client using uenum_close function.
  *
  * @param localeID the locale to get the variant code with
  * @param status error information if retrieving the keywords failed
  * @return enumeration of keywords or NULL if there are no keywords.
  * @stable ICU 2.8
  */
 U_CAPI UEnumeration* U_EXPORT2
 uloc_openKeywords(const char* localeID,
                         UErrorCode* status);
 
 /**
  * Get the value for a keyword. Locale name does not need to be normalized.
  * 
  * @param localeID locale name containing the keyword ("de_DE@currency=EURO;collation=PHONEBOOK")
  * @param keywordName name of the keyword for which we want the value; must not be
  *  NULL or empty, and must consist only of [A-Za-z0-9]. Case insensitive.
  * @param buffer receiving buffer
  * @param bufferCapacity capacity of receiving buffer
  * @param status containing error code: e.g. buffer not big enough or ill-formed localeID
  *  or keywordName parameters.
  * @return the length of keyword value
  * @stable ICU 2.8
  */
 U_CAPI int32_t U_EXPORT2
 uloc_getKeywordValue(const char* localeID,
                      const char* keywordName,
                      char* buffer, int32_t bufferCapacity,
                      UErrorCode* status);
 
 
 /**
  * Sets or removes the value of the specified keyword.
  *
  * For removing all keywords, use uloc_getBaseName().
  *
  * NOTE: Unlike almost every other ICU function which takes a
  * buffer, this function will NOT truncate the output text, and will
  * not update the buffer with unterminated text setting a status of
  * U_STRING_NOT_TERMINATED_WARNING. If a BUFFER_OVERFLOW_ERROR is received,
  * it means a terminated version of the updated locale ID would not fit
  * in the buffer, and the original buffer is untouched. This is done to
  * prevent incorrect or possibly even malformed locales from being generated
  * and used.
  *
  * @param keywordName name of the keyword to be set; must not be
  *  NULL or empty, and must consist only of [A-Za-z0-9]. Case insensitive.
  * @param keywordValue value of the keyword to be set. If 0-length or
  *  NULL, will result in the keyword being removed; no error is given if 
  *  that keyword does not exist. Otherwise, must consist only of
  *  [A-Za-z0-9] and [/_+-].
  * @param buffer input buffer containing well-formed locale ID to be
  *  modified.
  * @param bufferCapacity capacity of receiving buffer
  * @param status containing error code: e.g. buffer not big enough
  *  or ill-formed keywordName or keywordValue parameters, or ill-formed
  *  locale ID in buffer on input.
  * @return the length needed for the buffer
  * @see uloc_getKeywordValue
  * @stable ICU 3.2
  */
 U_CAPI int32_t U_EXPORT2
 uloc_setKeywordValue(const char* keywordName,
                      const char* keywordValue,
                      char* buffer, int32_t bufferCapacity,
                      UErrorCode* status);
 
 /**
  * Returns whether the locale's script is written right-to-left.
  * If there is no script subtag, then the likely script is used, see uloc_addLikelySubtags().
  * If no likely script is known, then false is returned.
  *
  * A script is right-to-left according to the CLDR script metadata
  * which corresponds to whether the script's letters have Bidi_Class=R or AL.
  *
  * Returns true for "ar" and "en-Hebr", false for "zh" and "fa-Cyrl".
  *
  * @param locale input locale ID
  * @return true if the locale's script is written right-to-left
  * @stable ICU 54
  */
 U_CAPI UBool U_EXPORT2
 uloc_isRightToLeft(const char *locale);
 
 /**
  * enums for the  return value for the character and line orientation
  * functions.
  * @stable ICU 4.0
  */
 typedef enum {
   ULOC_LAYOUT_LTR   = 0,  /* left-to-right. */
   ULOC_LAYOUT_RTL    = 1,  /* right-to-left. */
   ULOC_LAYOUT_TTB    = 2,  /* top-to-bottom. */
   ULOC_LAYOUT_BTT    = 3,   /* bottom-to-top. */
   ULOC_LAYOUT_UNKNOWN
 } ULayoutType;
 
 /**
  * Get the layout character orientation for the specified locale.
  * 
  * @param localeId locale name
  * @param status Error status
  * @return an enum indicating the layout orientation for characters.
  * @stable ICU 4.0
  */
 U_CAPI ULayoutType U_EXPORT2
 uloc_getCharacterOrientation(const char* localeId,
                              UErrorCode *status);
 
 /**
  * Get the layout line orientation for the specified locale.
  * 
  * @param localeId locale name
  * @param status Error status
  * @return an enum indicating the layout orientation for lines.
  * @stable ICU 4.0
  */
 U_CAPI ULayoutType U_EXPORT2
 uloc_getLineOrientation(const char* localeId,
                         UErrorCode *status);
 
 /**
  * Output values which uloc_acceptLanguage() writes to the 'outResult' parameter.
  *
  * @see uloc_acceptLanguageFromHTTP
  * @see uloc_acceptLanguage
  * @stable ICU 3.2
  */
 typedef enum {
     /**
      * No exact match was found.
      * @stable ICU 3.2
      */
     ULOC_ACCEPT_FAILED   = 0,
     /**
      * An exact match was found.
      * @stable ICU 3.2
      */
     ULOC_ACCEPT_VALID    = 1,
     /**
      * A fallback was found. For example, the Accept-Language list includes 'ja_JP'
      * and is matched with available locale 'ja'.
      * @stable ICU 3.2
      */
     ULOC_ACCEPT_FALLBACK = 2   /*  */
 } UAcceptResult;
 
 /**
  * Based on a HTTP header from a web browser and a list of available locales,
  * determine an acceptable locale for the user.
  *
  * This is a thin wrapper over C++ class LocaleMatcher.
  *
  * @param result - buffer to accept the result locale
  * @param resultAvailable the size of the result buffer.
  * @param outResult - An out parameter that contains the fallback status
  * @param httpAcceptLanguage - "Accept-Language:" header as per HTTP.
  * @param availableLocales - list of available locales to match
  * @param status ICU error code. Its input value must pass the U_SUCCESS() test,
  *               or else the function returns immediately. Check for U_FAILURE()
  *               on output or use with function chaining. (See User Guide for details.)
  * @return length needed for the locale.
  * @stable ICU 3.2
  */
 U_CAPI int32_t U_EXPORT2
 uloc_acceptLanguageFromHTTP(char *result, int32_t resultAvailable,
                             UAcceptResult *outResult,
                             const char *httpAcceptLanguage,
                             UEnumeration* availableLocales,
                             UErrorCode *status);
 
 /**
  * Based on a list of available locales,
  * determine an acceptable locale for the user.
  *
  * This is a thin wrapper over C++ class LocaleMatcher.
  *
  * @param result - buffer to accept the result locale
  * @param resultAvailable the size of the result buffer.
  * @param outResult - An out parameter that contains the fallback status
  * @param acceptList - list of acceptable languages
  * @param acceptListCount - count of acceptList items
  * @param availableLocales - list of available locales to match
  * @param status ICU error code. Its input value must pass the U_SUCCESS() test,
  *               or else the function returns immediately. Check for U_FAILURE()
  *               on output or use with function chaining. (See User Guide for details.)
  * @return length needed for the locale.
  * @stable ICU 3.2
  */
 U_CAPI int32_t U_EXPORT2
 uloc_acceptLanguage(char *result, int32_t resultAvailable, 
                     UAcceptResult *outResult, const char **acceptList,
                     int32_t acceptListCount,
                     UEnumeration* availableLocales,
                     UErrorCode *status);
 
 
 /**
  * Gets the ICU locale ID for the specified Win32 LCID value.
  *
  * @param hostID the Win32 LCID to translate
  * @param locale the output buffer for the ICU locale ID, which will be NUL-terminated
  *  if there is room.
  * @param localeCapacity the size of the output buffer
  * @param status an error is returned if the LCID is unrecognized or the output buffer
  *  is too small
  * @return actual the actual size of the locale ID, not including NUL-termination 
  * @stable ICU 3.8
  */
 U_CAPI int32_t U_EXPORT2
 uloc_getLocaleForLCID(uint32_t hostID, char *locale, int32_t localeCapacity,
                     UErrorCode *status);
 
 
 /**
  * Add the likely subtags for a provided locale ID, per the algorithm described
  * in the following CLDR technical report:
  *
  *   http://www.unicode.org/reports/tr35/#Likely_Subtags
  *
  * If localeID is already in the maximal form, or there is no data available
  * for maximization, it will be copied to the output buffer.  For example,
  * "sh" cannot be maximized, since there is no reasonable maximization.
  *
  * Examples:
  *
  * "und_Zzzz" maximizes to "en_Latn_US"
  *
  * "en" maximizes to "en_Latn_US"
  *
  * "de" maximizes to "de_Latn_DE"
  *
  * "sr" maximizes to "sr_Cyrl_RS"
  *
  * "zh_Hani" maximizes to "zh_Hani_CN"
  *
  *
  * @param localeID The locale to maximize
  * @param maximizedLocaleID The maximized locale
  * @param maximizedLocaleIDCapacity The capacity of the maximizedLocaleID buffer
  * @param err Error information if maximizing the locale failed.  If the length
  * of the localeID and the null-terminator is greater than the maximum allowed size,
  * or the localeId is not well-formed, the error code is U_ILLEGAL_ARGUMENT_ERROR.
  * @return The actual buffer size needed for the maximized locale.  If it's
  * greater than maximizedLocaleIDCapacity, the returned ID will be truncated.
  * On error, the return value is -1.
  * @stable ICU 4.0
  */
 U_CAPI int32_t U_EXPORT2
 uloc_addLikelySubtags(const char*    localeID,
          char* maximizedLocaleID,
          int32_t maximizedLocaleIDCapacity,
          UErrorCode* err);
 
 
 /**
  * Minimize the subtags for a provided locale ID, per the algorithm described
  * in the following CLDR technical report:
  *
  *   http://www.unicode.org/reports/tr35/#Likely_Subtags
  *
  * If localeID is already in the minimal form, or there is no data available
  * for minimization, it will be copied to the output buffer.  Since the
  * minimization algorithm relies on proper maximization, see the comments
  * for uloc_addLikelySubtags for reasons why there might not be any data.
  *
  * Examples:
  *
  * "en_Latn_US" minimizes to "en"
  *
  * "de_Latn_US" minimizes to "de"
  *
  * "sr_Cyrl_RS" minimizes to "sr"
  *
  * "zh_Hant_TW" minimizes to "zh_TW" (The region is preferred to the
  * script, and minimizing to "zh" would imply "zh_Hans_CN".)
  *
  * @param localeID The locale to minimize
  * @param minimizedLocaleID The minimized locale
  * @param minimizedLocaleIDCapacity The capacity of the minimizedLocaleID buffer
  * @param err Error information if minimizing the locale failed.  If the length
  * of the localeID and the null-terminator is greater than the maximum allowed size,
  * or the localeId is not well-formed, the error code is U_ILLEGAL_ARGUMENT_ERROR.
  * @return The actual buffer size needed for the minimized locale.  If it's
  * greater than minimizedLocaleIDCapacity, the returned ID will be truncated.
  * On error, the return value is -1.
  * @stable ICU 4.0
  */
 U_CAPI int32_t U_EXPORT2
 uloc_minimizeSubtags(const char*    localeID,
          char* minimizedLocaleID,
          int32_t minimizedLocaleIDCapacity,
          UErrorCode* err);
 
 /**
  * Returns a locale ID for the specified BCP47 language tag string.
  * If the specified language tag contains any ill-formed subtags,
  * the first such subtag and all following subtags are ignored.
  * <p>
  * This implements the 'Language-Tag' production of BCP 47, and so
  * supports legacy language tags (marked as “Type: grandfathered” in BCP 47)
  * (regular and irregular) as well as private use language tags.
  *
  * Private use tags are represented as 'x-whatever',
  * and legacy tags are converted to their canonical replacements where they exist.
  *
  * Note that a few legacy tags have no modern replacement;
  * these will be converted using the fallback described in
  * the first paragraph, so some information might be lost.
  *
  * @param langtag   the input BCP47 language tag.
  * @param localeID  the output buffer receiving a locale ID for the
  *                  specified BCP47 language tag.
  * @param localeIDCapacity  the size of the locale ID output buffer.
  * @param parsedLength  if not NULL, successfully parsed length
  *                      for the input language tag is set.
  * @param err       error information if receiving the locald ID
  *                  failed.
  * @return          the length of the locale ID.
  * @stable ICU 4.2
  */
 U_CAPI int32_t U_EXPORT2
 uloc_forLanguageTag(const char* langtag,
                     char* localeID,
                     int32_t localeIDCapacity,
                     int32_t* parsedLength,
                     UErrorCode* err);
 
 /**
  * Returns a well-formed language tag for this locale ID. 
  * <p> 
  * <b>Note</b>: When <code>strict</code> is false, any locale
  * fields which do not satisfy the BCP47 syntax requirement will
  * be omitted from the result.  When <code>strict</code> is
  * true, this function sets U_ILLEGAL_ARGUMENT_ERROR to the
  * <code>err</code> if any locale fields do not satisfy the
  * BCP47 syntax requirement.
  * @param localeID  the input locale ID
  * @param langtag   the output buffer receiving BCP47 language
  *                  tag for the locale ID.
  * @param langtagCapacity   the size of the BCP47 language tag
  *                          output buffer.
  * @param strict    boolean value indicating if the function returns
  *                  an error for an ill-formed input locale ID.
  * @param err       error information if receiving the language
  *                  tag failed.
  * @return          The length of the BCP47 language tag.
  * @stable ICU 4.2
  */
 U_CAPI int32_t U_EXPORT2
 uloc_toLanguageTag(const char* localeID,
                    char* langtag,
                    int32_t langtagCapacity,
                    UBool strict,
                    UErrorCode* err);
 
 /**
  * Converts the specified keyword (legacy key, or BCP 47 Unicode locale
  * extension key) to the equivalent BCP 47 Unicode locale extension key.
  * For example, BCP 47 Unicode locale extension key "co" is returned for
  * the input keyword "collation".
  * <p>
  * When the specified keyword is unknown, but satisfies the BCP syntax,
  * then the pointer to the input keyword itself will be returned.
  * For example,
  * <code>uloc_toUnicodeLocaleKey("ZZ")</code> returns "ZZ".
  * 
  * @param keyword       the input locale keyword (either legacy key
  *                      such as "collation" or BCP 47 Unicode locale extension
  *                      key such as "co").
  * @return              the well-formed BCP 47 Unicode locale extension key,
  *                      or NULL if the specified locale keyword cannot be
  *                      mapped to a well-formed BCP 47 Unicode locale extension
  *                      key. 
  * @see uloc_toLegacyKey
  * @stable ICU 54
  */
 U_CAPI const char* U_EXPORT2
 uloc_toUnicodeLocaleKey(const char* keyword);
 
 /**
  * Converts the specified keyword value (legacy type, or BCP 47
  * Unicode locale extension type) to the well-formed BCP 47 Unicode locale
  * extension type for the specified keyword (category). For example, BCP 47
  * Unicode locale extension type "phonebk" is returned for the input
  * keyword value "phonebook", with the keyword "collation" (or "co").
  * <p>
  * When the specified keyword is not recognized, but the specified value
  * satisfies the syntax of the BCP 47 Unicode locale extension type,
  * or when the specified keyword allows 'variable' type and the specified
  * value satisfies the syntax,  then the pointer to the input type value itself
  * will be returned.
  * For example,
  * <code>uloc_toUnicodeLocaleType("Foo", "Bar")</code> returns "Bar",
  * <code>uloc_toUnicodeLocaleType("variableTop", "00A4")</code> returns "00A4".
  * 
  * @param keyword       the locale keyword (either legacy key such as
  *                      "collation" or BCP 47 Unicode locale extension
  *                      key such as "co").
  * @param value         the locale keyword value (either legacy type
  *                      such as "phonebook" or BCP 47 Unicode locale extension
  *                      type such as "phonebk").
  * @return              the well-formed BCP47 Unicode locale extension type,
  *                      or NULL if the locale keyword value cannot be mapped to
  *                      a well-formed BCP 47 Unicode locale extension type.
  * @see uloc_toLegacyType
  * @stable ICU 54
  */
 U_CAPI const char* U_EXPORT2
 uloc_toUnicodeLocaleType(const char* keyword, const char* value);
 
 /**
  * Converts the specified keyword (BCP 47 Unicode locale extension key, or
  * legacy key) to the legacy key. For example, legacy key "collation" is
  * returned for the input BCP 47 Unicode locale extension key "co".
  * 
  * @param keyword       the input locale keyword (either BCP 47 Unicode locale
  *                      extension key or legacy key).
  * @return              the well-formed legacy key, or NULL if the specified
  *                      keyword cannot be mapped to a well-formed legacy key.
  * @see toUnicodeLocaleKey
  * @stable ICU 54
  */
 U_CAPI const char* U_EXPORT2
 uloc_toLegacyKey(const char* keyword);
 
 /**
  * Converts the specified keyword value (BCP 47 Unicode locale extension type,
  * or legacy type or type alias) to the canonical legacy type. For example,
  * the legacy type "phonebook" is returned for the input BCP 47 Unicode
  * locale extension type "phonebk" with the keyword "collation" (or "co").
  * <p>
  * When the specified keyword is not recognized, but the specified value
  * satisfies the syntax of legacy key, or when the specified keyword
  * allows 'variable' type and the specified value satisfies the syntax,
  * then the pointer to the input type value itself will be returned.
  * For example,
  * <code>uloc_toLegacyType("Foo", "Bar")</code> returns "Bar",
  * <code>uloc_toLegacyType("vt", "00A4")</code> returns "00A4".
  *
  * @param keyword       the locale keyword (either legacy keyword such as
  *                      "collation" or BCP 47 Unicode locale extension
  *                      key such as "co").
  * @param value         the locale keyword value (either BCP 47 Unicode locale
  *                      extension type such as "phonebk" or legacy keyword value
  *                      such as "phonebook").
  * @return              the well-formed legacy type, or NULL if the specified
  *                      keyword value cannot be mapped to a well-formed legacy
  *                      type.
  * @see toUnicodeLocaleType
  * @stable ICU 54
  */
 U_CAPI const char* U_EXPORT2
 uloc_toLegacyType(const char* keyword, const char* value);
 
 #endif /*_ULOC*/

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