icuSources/common/unicode/uloc.h

   1 /*
   2 **********************************************************************
   3 *   Copyright (C) 1997-2016, International Business Machines
   4 *   Corporation and others.  All Rights Reserved.
   5 **********************************************************************
   6 *
   7 * File ULOC.H
   8 *
   9 * Modification History:
  10 *
  11 *   Date        Name        Description
  12 *   04/01/97    aliu        Creation.
  13 *   08/22/98    stephen     JDK 1.2 sync.
  14 *   12/08/98    rtg         New C API for Locale
  15 *   03/30/99    damiba      overhaul
  16 *   03/31/99    helena      Javadoc for uloc functions.
  17 *   04/15/99    Madhu       Updated Javadoc
  18 ********************************************************************************
  19 */
  20
  21 #ifndef ULOC_H
  22 #define ULOC_H
  23
  24 #include "unicode/utypes.h"
  25 #include "unicode/uenum.h"
  26
  27 /**
  28  * \file
  29  * \brief  C API: Locale
  30  *
  31  * <h2> ULoc C API for Locale </h2>
  32  * A <code>Locale</code> represents a specific geographical, political,
  33  * or cultural region. An operation that requires a <code>Locale</code> to perform
  34  * its task is called <em>locale-sensitive</em> and uses the <code>Locale</code>
  35  * to tailor information for the user. For example, displaying a number
  36  * is a locale-sensitive operation--the number should be formatted
  37  * according to the customs/conventions of the user's native country,
  38  * region, or culture.  In the C APIs, a locales is simply a const char string.
  39  *
  40  * <P>
  41  * You create a <code>Locale</code> with one of the three options listed below.
  42  * Each of the component is separated by '_' in the locale string.
  43  * \htmlonly<blockquote>\endhtmlonly
  44  * <pre>
  45  * \code
  46  *       newLanguage
  47  *
  48  *       newLanguage + newCountry
  49  *
  50  *       newLanguage + newCountry + newVariant
  51  * \endcode
  52  * </pre>
  53  * \htmlonly</blockquote>\endhtmlonly
  54  * The first option is a valid <STRONG>ISO
  55  * Language Code.</STRONG> These codes are the lower-case two-letter
  56  * codes as defined by ISO-639.
  57  * You can find a full list of these codes at a number of sites, such as:
  58  * <BR><a href ="http://www.ics.uci.edu/pub/ietf/http/related/iso639.txt">
  59  * http://www.ics.uci.edu/pub/ietf/http/related/iso639.txt</a>
  60  *
  61  * <P>
  62  * The second option includes an additonal <STRONG>ISO Country
  63  * Code.</STRONG> These codes are the upper-case two-letter codes
  64  * as defined by ISO-3166.
  65  * You can find a full list of these codes at a number of sites, such as:
  66  * <BR><a href="http://www.chemie.fu-berlin.de/diverse/doc/ISO_3166.html">
  67  * http://www.chemie.fu-berlin.de/diverse/doc/ISO_3166.html</a>
  68  *
  69  * <P>
  70  * The third option requires another additonal information--the
  71  * <STRONG>Variant.</STRONG>
  72  * The Variant codes are vendor and browser-specific.
  73  * For example, use WIN for Windows, MAC for Macintosh, and POSIX for POSIX.
  74  * Where there are two variants, separate them with an underscore, and
  75  * put the most important one first. For
  76  * example, a Traditional Spanish collation might be referenced, with
  77  * "ES", "ES", "Traditional_WIN".
  78  *
  79  * <P>
  80  * Because a <code>Locale</code> is just an identifier for a region,
  81  * no validity check is performed when you specify a <code>Locale</code>.
  82  * If you want to see whether particular resources are available for the
  83  * <code>Locale</code> you asked for, you must query those resources. For
  84  * example, ask the <code>UNumberFormat</code> for the locales it supports
  85  * using its <code>getAvailable</code> method.
  86  * <BR><STRONG>Note:</STRONG> When you ask for a resource for a particular
  87  * locale, you get back the best available match, not necessarily
  88  * precisely what you asked for. For more information, look at
  89  * <code>UResourceBundle</code>.
  90  *
  91  * <P>
  92  * The <code>Locale</code> provides a number of convenient constants
  93  * that you can use to specify the commonly used
  94  * locales. For example, the following refers to a locale
  95  * for the United States:
  96  * \htmlonly<blockquote>\endhtmlonly
  97  * <pre>
  98  * \code
  99  *       ULOC_US
 100  * \endcode
 101  * </pre>
 102  * \htmlonly</blockquote>\endhtmlonly
 103  *
 104  * <P>
 105  * Once you've specified a locale you can query it for information about
 106  * itself. Use <code>uloc_getCountry</code> to get the ISO Country Code and
 107  * <code>uloc_getLanguage</code> to get the ISO Language Code. You can
 108  * use <code>uloc_getDisplayCountry</code> to get the
 109  * name of the country suitable for displaying to the user. Similarly,
 110  * you can use <code>uloc_getDisplayLanguage</code> to get the name of
 111  * the language suitable for displaying to the user. Interestingly,
 112  * the <code>uloc_getDisplayXXX</code> methods are themselves locale-sensitive
 113  * and have two versions: one that uses the default locale and one
 114  * that takes a locale as an argument and displays the name or country in
 115  * a language appropriate to that locale.
 116  *
 117  * <P>
 118  * The ICU provides a number of services that perform locale-sensitive
 119  * operations. For example, the <code>unum_xxx</code> functions format
 120  * numbers, currency, or percentages in a locale-sensitive manner.
 121  * </P>
 122  * \htmlonly<blockquote>\endhtmlonly
 123  * <pre>
 124  * \code
 125  *     UErrorCode success = U_ZERO_ERROR;
 126  *     UNumberFormat *nf;
 127  *     const char* myLocale = "fr_FR";
 128  *
 129  *     nf = unum_open( UNUM_DEFAULT, NULL, success );
 130  *     unum_close(nf);
 131  *     nf = unum_open( UNUM_CURRENCY, NULL, success );
 132  *     unum_close(nf);
 133  *     nf = unum_open( UNUM_PERCENT, NULL, success );
 134  *     unum_close(nf);
 135  * \endcode
 136  * </pre>
 137  * \htmlonly</blockquote>\endhtmlonly
 138  * Each of these methods has two variants; one with an explicit locale
 139  * and one without; the latter using the default locale.
 140  * \htmlonly<blockquote>\endhtmlonly
 141  * <pre>
 142  * \code
 143  *
 144  *     nf = unum_open( UNUM_DEFAULT, myLocale, success );
 145  *     unum_close(nf);
 146  *     nf = unum_open( UNUM_CURRENCY, myLocale, success );
 147  *     unum_close(nf);
 148  *     nf = unum_open( UNUM_PERCENT, myLocale, success );
 149  *     unum_close(nf);
 150  * \endcode
 151  * </pre>
 152  * \htmlonly</blockquote>\endhtmlonly
 153  * A <code>Locale</code> is the mechanism for identifying the kind of services
 154  * (<code>UNumberFormat</code>) that you would like to get. The locale is
 155  * <STRONG>just</STRONG> a mechanism for identifying these services.
 156  *
 157  * <P>
 158  * Each international serivce that performs locale-sensitive operations
 159  * allows you
 160  * to get all the available objects of that type. You can sift
 161  * through these objects by language, country, or variant,
 162  * and use the display names to present a menu to the user.
 163  * For example, you can create a menu of all the collation objects
 164  * suitable for a given language. Such classes implement these
 165  * three class methods:
 166  * \htmlonly<blockquote>\endhtmlonly
 167  * <pre>
 168  * \code
 169  *       const char* uloc_getAvailable(int32_t index);
 170  *       int32_t uloc_countAvailable();
 171  *       int32_t
 172  *       uloc_getDisplayName(const char* localeID,
 173  *                 const char* inLocaleID,
 174  *                 UChar* result,
 175  *                 int32_t maxResultSize,
 176  *                  UErrorCode* err);
 177  *
 178  * \endcode
 179  * </pre>
 180  * \htmlonly</blockquote>\endhtmlonly
 181  * <P>
 182  * Concerning POSIX/RFC1766 Locale IDs,
 183  *  the getLanguage/getCountry/getVariant/getName functions do understand
 184  * the POSIX type form of  language_COUNTRY.ENCODING\@VARIANT
 185  * and if there is not an ICU-stype variant, uloc_getVariant() for example
 186  * will return the one listed after the \@at sign. As well, the hyphen
 187  * "-" is recognized as a country/variant separator similarly to RFC1766.
 188  * So for example, "en-us" will be interpreted as en_US.
 189  * As a result, uloc_getName() is far from a no-op, and will have the
 190  * effect of converting POSIX/RFC1766 IDs into ICU form, although it does
 191  * NOT map any of the actual codes (i.e. russian->ru) in any way.
 192  * Applications should call uloc_getName() at the point where a locale ID
 193  * is coming from an external source (user entry, OS, web browser)
 194  * and pass the resulting string to other ICU functions.  For example,
 195  * don't use de-de\@EURO as an argument to resourcebundle.
 196  *
 197  * @see UResourceBundle
 198  */
 199
 200 /** Useful constant for this language. @stable ICU 2.0 */
 201 #define ULOC_CHINESE            "zh"
 202 /** Useful constant for this language. @stable ICU 2.0 */
 203 #define ULOC_ENGLISH            "en"
 204 /** Useful constant for this language. @stable ICU 2.0 */
 205 #define ULOC_FRENCH             "fr"
 206 /** Useful constant for this language. @stable ICU 2.0 */
 207 #define ULOC_GERMAN             "de"
 208 /** Useful constant for this language. @stable ICU 2.0 */
 209 #define ULOC_ITALIAN            "it"
 210 /** Useful constant for this language. @stable ICU 2.0 */
 211 #define ULOC_JAPANESE           "ja"
 212 /** Useful constant for this language. @stable ICU 2.0 */
 213 #define ULOC_KOREAN             "ko"
 214 /** Useful constant for this language. @stable ICU 2.0 */
 215 #define ULOC_SIMPLIFIED_CHINESE "zh_CN"
 216 /** Useful constant for this language. @stable ICU 2.0 */
 217 #define ULOC_TRADITIONAL_CHINESE "zh_TW"
 218
 219 /** Useful constant for this country/region. @stable ICU 2.0 */
 220 #define ULOC_CANADA         "en_CA"
 221 /** Useful constant for this country/region. @stable ICU 2.0 */
 222 #define ULOC_CANADA_FRENCH  "fr_CA"
 223 /** Useful constant for this country/region. @stable ICU 2.0 */
 224 #define ULOC_CHINA          "zh_CN"
 225 /** Useful constant for this country/region. @stable ICU 2.0 */
 226 #define ULOC_PRC            "zh_CN"
 227 /** Useful constant for this country/region. @stable ICU 2.0 */
 228 #define ULOC_FRANCE         "fr_FR"
 229 /** Useful constant for this country/region. @stable ICU 2.0 */
 230 #define ULOC_GERMANY        "de_DE"
 231 /** Useful constant for this country/region. @stable ICU 2.0 */
 232 #define ULOC_ITALY          "it_IT"
 233 /** Useful constant for this country/region. @stable ICU 2.0 */
 234 #define ULOC_JAPAN          "ja_JP"
 235 /** Useful constant for this country/region. @stable ICU 2.0 */
 236 #define ULOC_KOREA          "ko_KR"
 237 /** Useful constant for this country/region. @stable ICU 2.0 */
 238 #define ULOC_TAIWAN         "zh_TW"
 239 /** Useful constant for this country/region. @stable ICU 2.0 */
 240 #define ULOC_UK             "en_GB"
 241 /** Useful constant for this country/region. @stable ICU 2.0 */
 242 #define ULOC_US             "en_US"
 243
 244 /**
 245  * Useful constant for the maximum size of the language part of a locale ID.
 246  * (including the terminating NULL).
 247  * @stable ICU 2.0
 248  */
 249 #define ULOC_LANG_CAPACITY 12
 250
 251 /**
 252  * Useful constant for the maximum size of the country part of a locale ID
 253  * (including the terminating NULL).
 254  * @stable ICU 2.0
 255  */
 256 #define ULOC_COUNTRY_CAPACITY 4
 257 /**
 258  * Useful constant for the maximum size of the whole locale ID
 259  * (including the terminating NULL and all keywords).
 260  * @stable ICU 2.0
 261  */
 262 #define ULOC_FULLNAME_CAPACITY 157
 263
 264 /**
 265  * Useful constant for the maximum size of the script part of a locale ID
 266  * (including the terminating NULL).
 267  * @stable ICU 2.8
 268  */
 269 #define ULOC_SCRIPT_CAPACITY 6
 270
 271 /**
 272  * Useful constant for the maximum size of keywords in a locale
 273  * @stable ICU 2.8
 274  */
 275 #define ULOC_KEYWORDS_CAPACITY 96
 276
 277 /**
 278  * Useful constant for the maximum total size of keywords and their values in a locale
 279  * @stable ICU 2.8
 280  */
 281 #define ULOC_KEYWORD_AND_VALUES_CAPACITY 100
 282
 283 /**
 284  * Invariant character separating keywords from the locale string
 285  * @stable ICU 2.8
 286  */
 287 #define ULOC_KEYWORD_SEPARATOR '@'
 288
 289 /**
 290   * Unicode code point for '@' separating keywords from the locale string.
 291   * @see ULOC_KEYWORD_SEPARATOR
 292   * @stable ICU 4.6
 293   */
 294 #define ULOC_KEYWORD_SEPARATOR_UNICODE 0x40
 295
 296 /**
 297  * Invariant character for assigning value to a keyword
 298  * @stable ICU 2.8
 299  */
 300 #define ULOC_KEYWORD_ASSIGN '='
 301
 302 /**
 303   * Unicode code point for '=' for assigning value to a keyword.
 304   * @see ULOC_KEYWORD_ASSIGN
 305   * @stable ICU 4.6
 306   */
 307 #define ULOC_KEYWORD_ASSIGN_UNICODE 0x3D
 308
 309 /**
 310  * Invariant character separating keywords
 311  * @stable ICU 2.8
 312  */
 313 #define ULOC_KEYWORD_ITEM_SEPARATOR ';'
 314
 315 /**
 316   * Unicode code point for ';' separating keywords
 317   * @see ULOC_KEYWORD_ITEM_SEPARATOR
 318   * @stable ICU 4.6
 319   */
 320 #define ULOC_KEYWORD_ITEM_SEPARATOR_UNICODE 0x3B
 321
 322 /**
 323  * Constants for *_getLocale()
 324  * Allow user to select whether she wants information on
 325  * requested, valid or actual locale.
 326  * For example, a collator for "en_US_CALIFORNIA" was
 327  * requested. In the current state of ICU (2.0),
 328  * the requested locale is "en_US_CALIFORNIA",
 329  * the valid locale is "en_US" (most specific locale supported by ICU)
 330  * and the actual locale is "root" (the collation data comes unmodified
 331  * from the UCA)
 332  * The locale is considered supported by ICU if there is a core ICU bundle
 333  * for that locale (although it may be empty).
 334  * @stable ICU 2.1
 335  */
 336 typedef enum {
 337   /** This is locale the data actually comes from
 338    * @stable ICU 2.1
 339    */
 340   ULOC_ACTUAL_LOCALE    = 0,
 341   /** This is the most specific locale supported by ICU
 342    * @stable ICU 2.1
 343    */
 344   ULOC_VALID_LOCALE    = 1,
 345
 346 #ifndef U_HIDE_DEPRECATED_API
 347   /** This is the requested locale
 348    *  @deprecated ICU 2.8
 349    */
 350   ULOC_REQUESTED_LOCALE = 2,
 351 #endif /* U_HIDE_DEPRECATED_API */
 352
 353   ULOC_DATA_LOCALE_TYPE_LIMIT = 3
 354 } ULocDataLocaleType ;
 355
 356 #ifndef U_HIDE_SYSTEM_API
 357 /**
 358  * Gets ICU's default locale.
 359  * The returned string is a snapshot in time, and will remain valid
 360  *   and unchanged even when uloc_setDefault() is called.
 361  *   The returned storage is owned by ICU, and must not be altered or deleted
 362  *   by the caller.
 363  *
 364  * @return the ICU default locale
 365  * @system
 366  * @stable ICU 2.0
 367  */
 368 U_STABLE const char* U_EXPORT2
 369 uloc_getDefault(void);
 370
 371 /**
 372  * Sets ICU's default locale.
 373  *    By default (without calling this function), ICU's default locale will be based
 374  *    on information obtained from the underlying system environment.
 375  *    <p>
 376  *    Changes to ICU's default locale do not propagate back to the
 377  *    system environment.
 378  *    <p>
 379  *    Changes to ICU's default locale to not affect any ICU services that
 380  *    may already be open based on the previous default locale value.
 381  *
 382  * @param localeID the new ICU default locale. A value of NULL will try to get
 383  *                 the system's default locale.
 384  * @param status the error information if the setting of default locale fails
 385  * @system
 386  * @stable ICU 2.0
 387  */
 388 U_STABLE void U_EXPORT2
 389 uloc_setDefault(const char* localeID,
 390         UErrorCode*       status);
 391 #endif  /* U_HIDE_SYSTEM_API */
 392
 393 /**
 394  * Gets the language code for the specified locale.
 395  *
 396  * @param localeID the locale to get the ISO language code with
 397  * @param language the language code for localeID
 398  * @param languageCapacity the size of the language buffer to store the
 399  * language code with
 400  * @param err error information if retrieving the language code failed
 401  * @return the actual buffer size needed for the language code.  If it's greater
 402  * than languageCapacity, the returned language code will be truncated.
 403  * @stable ICU 2.0
 404  */
 405 U_STABLE int32_t U_EXPORT2
 406 uloc_getLanguage(const char*    localeID,
 407          char* language,
 408          int32_t languageCapacity,
 409          UErrorCode* err);
 410
 411 /**
 412  * Gets the script code for the specified locale.
 413  *
 414  * @param localeID the locale to get the ISO language code with
 415  * @param script the language code for localeID
 416  * @param scriptCapacity the size of the language buffer to store the
 417  * language code with
 418  * @param err error information if retrieving the language code failed
 419  * @return the actual buffer size needed for the language code.  If it's greater
 420  * than scriptCapacity, the returned language code will be truncated.
 421  * @stable ICU 2.8
 422  */
 423 U_STABLE int32_t U_EXPORT2
 424 uloc_getScript(const char*    localeID,
 425          char* script,
 426          int32_t scriptCapacity,
 427          UErrorCode* err);
 428
 429 /**
 430  * Gets the  country code for the specified locale.
 431  *
 432  * @param localeID the locale to get the country code with
 433  * @param country the country code for localeID
 434  * @param countryCapacity the size of the country buffer to store the
 435  * country code with
 436  * @param err error information if retrieving the country code failed
 437  * @return the actual buffer size needed for the country code.  If it's greater
 438  * than countryCapacity, the returned country code will be truncated.
 439  * @stable ICU 2.0
 440  */
 441 U_STABLE int32_t U_EXPORT2
 442 uloc_getCountry(const char*    localeID,
 443         char* country,
 444         int32_t countryCapacity,
 445         UErrorCode* err);
 446
 447 /**
 448  * Gets the variant code for the specified locale.
 449  *
 450  * @param localeID the locale to get the variant code with
 451  * @param variant the variant code for localeID
 452  * @param variantCapacity the size of the variant buffer to store the
 453  * variant code with
 454  * @param err error information if retrieving the variant code failed
 455  * @return the actual buffer size needed for the variant code.  If it's greater
 456  * than variantCapacity, the returned variant code will be truncated.
 457  * @stable ICU 2.0
 458  */
 459 U_STABLE int32_t U_EXPORT2
 460 uloc_getVariant(const char*    localeID,
 461         char* variant,
 462         int32_t variantCapacity,
 463         UErrorCode* err);
 464
 465
 466 /**
 467  * Gets the full name for the specified locale.
 468  * Note: This has the effect of 'canonicalizing' the ICU locale ID to
 469  * a certain extent. Upper and lower case are set as needed.
 470  * It does NOT map aliased names in any way.
 471  * See the top of this header file.
 472  * This API supports preflighting.
 473  *
 474  * @param localeID the locale to get the full name with
 475  * @param name fill in buffer for the name without keywords.
 476  * @param nameCapacity capacity of the fill in buffer.
 477  * @param err error information if retrieving the full name failed
 478  * @return the actual buffer size needed for the full name.  If it's greater
 479  * than nameCapacity, the returned full name will be truncated.
 480  * @stable ICU 2.0
 481  */
 482 U_STABLE int32_t U_EXPORT2
 483 uloc_getName(const char*    localeID,
 484          char* name,
 485          int32_t nameCapacity,
 486          UErrorCode* err);
 487
 488 /**
 489  * Gets the full name for the specified locale.
 490  * Note: This has the effect of 'canonicalizing' the string to
 491  * a certain extent. Upper and lower case are set as needed,
 492  * and if the components were in 'POSIX' format they are changed to
 493  * ICU format.  It does NOT map aliased names in any way.
 494  * See the top of this header file.
 495  *
 496  * @param localeID the locale to get the full name with
 497  * @param name the full name for localeID
 498  * @param nameCapacity the size of the name buffer to store the
 499  * full name with
 500  * @param err error information if retrieving the full name failed
 501  * @return the actual buffer size needed for the full name.  If it's greater
 502  * than nameCapacity, the returned full name will be truncated.
 503  * @stable ICU 2.8
 504  */
 505 U_STABLE int32_t U_EXPORT2
 506 uloc_canonicalize(const char*    localeID,
 507          char* name,
 508          int32_t nameCapacity,
 509          UErrorCode* err);
 510
 511 /**
 512  * Gets the ISO language code for the specified locale.
 513  *
 514  * @param localeID the locale to get the ISO language code with
 515  * @return language the ISO language code for localeID
 516  * @stable ICU 2.0
 517  */
 518 U_STABLE const char* U_EXPORT2
 519 uloc_getISO3Language(const char* localeID);
 520
 521
 522 /**
 523  * Gets the ISO country code for the specified locale.
 524  *
 525  * @param localeID the locale to get the ISO country code with
 526  * @return country the ISO country code for localeID
 527  * @stable ICU 2.0
 528  */
 529 U_STABLE const char* U_EXPORT2
 530 uloc_getISO3Country(const char* localeID);
 531
 532 /**
 533  * Gets the Win32 LCID value for the specified locale.
 534  * If the ICU locale is not recognized by Windows, 0 will be returned.
 535  *
 536  * @param localeID the locale to get the Win32 LCID value with
 537  * @return country the Win32 LCID for localeID
 538  * @stable ICU 2.0
 539  */
 540 U_STABLE uint32_t U_EXPORT2
 541 uloc_getLCID(const char* localeID);
 542
 543 /**
 544  * Gets the language name suitable for display for the specified locale.
 545  *
 546  * @param locale the locale to get the ISO language code with
 547  * @param displayLocale Specifies the locale to be used to display the name.  In other words,
 548  *                 if the locale's language code is "en", passing Locale::getFrench() for
 549  *                 inLocale would result in "Anglais", while passing Locale::getGerman()
 550  *                 for inLocale would result in "Englisch".
 551  * @param language the displayable language code for localeID
 552  * @param languageCapacity the size of the language buffer to store the
 553  * displayable language code with
 554  * @param status error information if retrieving the displayable language code failed
 555  * @return the actual buffer size needed for the displayable language code.  If it's greater
 556  * than languageCapacity, the returned language code will be truncated.
 557  * @stable ICU 2.0
 558  */
 559 U_STABLE int32_t U_EXPORT2
 560 uloc_getDisplayLanguage(const char* locale,
 561             const char* displayLocale,
 562             UChar* language,
 563             int32_t languageCapacity,
 564             UErrorCode* status);
 565
 566 /**
 567  * Gets the script name suitable for display for the specified locale.
 568  *
 569  * @param locale the locale to get the displayable script code with. NULL may be used to specify the default.
 570  * @param displayLocale Specifies the locale to be used to display the name.  In other words,
 571  *                 if the locale's language code is "en", passing Locale::getFrench() for
 572  *                 inLocale would result in "", while passing Locale::getGerman()
 573  *                 for inLocale would result in "". NULL may be used to specify the default.
 574  * @param script the displayable country code for localeID
 575  * @param scriptCapacity the size of the script buffer to store the
 576  * displayable script code with
 577  * @param status error information if retrieving the displayable script code failed
 578  * @return the actual buffer size needed for the displayable script code.  If it's greater
 579  * than scriptCapacity, the returned displayable script code will be truncated.
 580  * @stable ICU 2.8
 581  */
 582 U_STABLE int32_t U_EXPORT2
 583 uloc_getDisplayScript(const char* locale,
 584             const char* displayLocale,
 585             UChar* script,
 586             int32_t scriptCapacity,
 587             UErrorCode* status);
 588
 589 /**
 590  * Gets the country name suitable for display for the specified locale.
 591  * Warning: this is for the region part of a valid locale ID; it cannot just be the region code (like "FR").
 592  * To get the display name for a region alone, or for other options, use ULocaleDisplayNames instead.
 593  *
 594  * @param locale the locale to get the displayable country code with. NULL may be used to specify the default.
 595  * @param displayLocale Specifies the locale to be used to display the name.  In other words,
 596  *                 if the locale's language code is "en", passing Locale::getFrench() for
 597  *                 inLocale would result in "Anglais", while passing Locale::getGerman()
 598  *                 for inLocale would result in "Englisch". NULL may be used to specify the default.
 599  * @param country the displayable country code for localeID
 600  * @param countryCapacity the size of the country buffer to store the
 601  * displayable country code with
 602  * @param status error information if retrieving the displayable country code failed
 603  * @return the actual buffer size needed for the displayable country code.  If it's greater
 604  * than countryCapacity, the returned displayable country code will be truncated.
 605  * @stable ICU 2.0
 606  */
 607 U_STABLE int32_t U_EXPORT2
 608 uloc_getDisplayCountry(const char* locale,
 609                        const char* displayLocale,
 610                        UChar* country,
 611                        int32_t countryCapacity,
 612                        UErrorCode* status);
 613
 614
 615 /**
 616  * Gets the variant name suitable for display for the specified locale.
 617  *
 618  * @param locale the locale to get the displayable variant code with. NULL may be used to specify the default.
 619  * @param displayLocale Specifies the locale to be used to display the name.  In other words,
 620  *                 if the locale's language code is "en", passing Locale::getFrench() for
 621  *                 inLocale would result in "Anglais", while passing Locale::getGerman()
 622  *                 for inLocale would result in "Englisch". NULL may be used to specify the default.
 623  * @param variant the displayable variant code for localeID
 624  * @param variantCapacity the size of the variant buffer to store the
 625  * displayable variant code with
 626  * @param status error information if retrieving the displayable variant code failed
 627  * @return the actual buffer size needed for the displayable variant code.  If it's greater
 628  * than variantCapacity, the returned displayable variant code will be truncated.
 629  * @stable ICU 2.0
 630  */
 631 U_STABLE int32_t U_EXPORT2
 632 uloc_getDisplayVariant(const char* locale,
 633                        const char* displayLocale,
 634                        UChar* variant,
 635                        int32_t variantCapacity,
 636                        UErrorCode* status);
 637
 638 /**
 639  * Gets the keyword name suitable for display for the specified locale.
 640  * E.g: for the locale string de_DE\@collation=PHONEBOOK, this API gets the display
 641  * string for the keyword collation.
 642  * Usage:
 643  * <code>
 644  *    UErrorCode status = U_ZERO_ERROR;
 645  *    const char* keyword =NULL;
 646  *    int32_t keywordLen = 0;
 647  *    int32_t keywordCount = 0;
 648  *    UChar displayKeyword[256];
 649  *    int32_t displayKeywordLen = 0;
 650  *    UEnumeration* keywordEnum = uloc_openKeywords("de_DE@collation=PHONEBOOK;calendar=TRADITIONAL", &status);
 651  *    for(keywordCount = uenum_count(keywordEnum, &status); keywordCount > 0 ; keywordCount--){
 652  *          if(U_FAILURE(status)){
 653  *              ...something went wrong so handle the error...
 654  *              break;
 655  *          }
 656  *          // the uenum_next returns NUL terminated string
 657  *          keyword = uenum_next(keywordEnum, &keywordLen, &status);
 658  *          displayKeywordLen = uloc_getDisplayKeyword(keyword, "en_US", displayKeyword, 256);
 659  *          ... do something interesting .....
 660  *    }
 661  *    uenum_close(keywordEnum);
 662  * </code>
 663  * @param keyword           The keyword whose display string needs to be returned.
 664  * @param displayLocale     Specifies the locale to be used to display the name.  In other words,
 665  *                          if the locale's language code is "en", passing Locale::getFrench() for
 666  *                          inLocale would result in "Anglais", while passing Locale::getGerman()
 667  *                          for inLocale would result in "Englisch". NULL may be used to specify the default.
 668  * @param dest              the buffer to which the displayable keyword should be written.
 669  * @param destCapacity      The size of the buffer (number of UChars). If it is 0, then
 670  *                          dest may be NULL and the function will only return the length of the
 671  *                          result without writing any of the result string (pre-flighting).
 672  * @param status            error information if retrieving the displayable string failed.
 673  *                          Should not be NULL and should not indicate failure on entry.
 674  * @return the actual buffer size needed for the displayable variant code.
 675  * @see #uloc_openKeywords
 676  * @stable ICU 2.8
 677  */
 678 U_STABLE int32_t U_EXPORT2
 679 uloc_getDisplayKeyword(const char* keyword,
 680                        const char* displayLocale,
 681                        UChar* dest,
 682                        int32_t destCapacity,
 683                        UErrorCode* status);
 684 /**
 685  * Gets the value of the keyword suitable for display for the specified locale.
 686  * E.g: for the locale string de_DE\@collation=PHONEBOOK, this API gets the display
 687  * string for PHONEBOOK, in the display locale, when "collation" is specified as the keyword.
 688  *
 689  * @param locale            The locale to get the displayable variant code with. NULL may be used to specify the default.
 690  * @param keyword           The keyword for whose value should be used.
 691  * @param displayLocale     Specifies the locale to be used to display the name.  In other words,
 692  *                          if the locale's language code is "en", passing Locale::getFrench() for
 693  *                          inLocale would result in "Anglais", while passing Locale::getGerman()
 694  *                          for inLocale would result in "Englisch". NULL may be used to specify the default.
 695  * @param dest              the buffer to which the displayable keyword should be written.
 696  * @param destCapacity      The size of the buffer (number of UChars). If it is 0, then
 697  *                          dest may be NULL and the function will only return the length of the
 698  *                          result without writing any of the result string (pre-flighting).
 699  * @param status            error information if retrieving the displayable string failed.
 700  *                          Should not be NULL and must not indicate failure on entry.
 701  * @return the actual buffer size needed for the displayable variant code.
 702  * @stable ICU 2.8
 703  */
 704 U_STABLE int32_t U_EXPORT2
 705 uloc_getDisplayKeywordValue(   const char* locale,
 706                                const char* keyword,
 707                                const char* displayLocale,
 708                                UChar* dest,
 709                                int32_t destCapacity,
 710                                UErrorCode* status);
 711 /**
 712  * Gets the full name suitable for display for the specified locale.
 713  *
 714  * @param localeID the locale to get the displayable name with. NULL may be used to specify the default.
 715  * @param inLocaleID Specifies the locale to be used to display the name.  In other words,
 716  *                   if the locale's language code is "en", passing Locale::getFrench() for
 717  *                   inLocale would result in "Anglais", while passing Locale::getGerman()
 718  *                   for inLocale would result in "Englisch". NULL may be used to specify the default.
 719  * @param result the displayable name for localeID
 720  * @param maxResultSize the size of the name buffer to store the
 721  * displayable full name with
 722  * @param err error information if retrieving the displayable name failed
 723  * @return the actual buffer size needed for the displayable name.  If it's greater
 724  * than maxResultSize, the returned displayable name will be truncated.
 725  * @stable ICU 2.0
 726  */
 727 U_STABLE int32_t U_EXPORT2
 728 uloc_getDisplayName(const char* localeID,
 729             const char* inLocaleID,
 730             UChar* result,
 731             int32_t maxResultSize,
 732             UErrorCode* err);
 733
 734
 735 /**
 736  * Gets the specified locale from a list of all available locales.
 737  * The return value is a pointer to an item of
 738  * a locale name array.  Both this array and the pointers
 739  * it contains are owned by ICU and should not be deleted or written through
 740  * by the caller.  The locale name is terminated by a null pointer.
 741  * @param n the specific locale name index of the available locale list
 742  * @return a specified locale name of all available locales
 743  * @stable ICU 2.0
 744  */
 745 U_STABLE const char* U_EXPORT2
 746 uloc_getAvailable(int32_t n);
 747
 748 /**
 749  * Gets the size of the all available locale list.
 750  *
 751  * @return the size of the locale list
 752  * @stable ICU 2.0
 753  */
 754 U_STABLE int32_t U_EXPORT2 uloc_countAvailable(void);
 755
 756 /**
 757  *
 758  * Gets a list of all available 2-letter language codes defined in ISO 639,
 759  * plus additional 3-letter codes determined to be useful for locale generation as
 760  * defined by Unicode CLDR. This is a pointer
 761  * to an array of pointers to arrays of char.  All of these pointers are owned
 762  * by ICU-- do not delete them, and do not write through them.  The array is
 763  * terminated with a null pointer.
 764  * @return a list of all available language codes
 765  * @stable ICU 2.0
 766  */
 767 U_STABLE const char* const* U_EXPORT2
 768 uloc_getISOLanguages(void);
 769
 770 /**
 771  *
 772  * Gets a list of all available 2-letter country codes which are valid regular
 773  * region codes in CLDR; these are based on the non-deprecated alpha-2 region
 774  * codes in ISO 3166-1. The return value is a pointer to an array of pointers
 775  * C strings.  All of these pointers are owned by ICU; do not delete them, and
 776  * do not write through them.  The array is terminated with a null pointer.
 777  * @return a list of all available country codes
 778  * @stable ICU 2.0
 779  */
 780 U_STABLE const char* const* U_EXPORT2
 781 uloc_getISOCountries(void);
 782
 783 /**
 784  * Truncate the locale ID string to get the parent locale ID.
 785  * Copies the part of the string before the last underscore.
 786  * The parent locale ID will be an empty string if there is no
 787  * underscore, or if there is only one underscore at localeID[0].
 788  *
 789  * @param localeID Input locale ID string.
 790  * @param parent   Output string buffer for the parent locale ID.
 791  * @param parentCapacity Size of the output buffer.
 792  * @param err A UErrorCode value.
 793  * @return The length of the parent locale ID.
 794  * @stable ICU 2.0
 795  */
 796 U_STABLE int32_t U_EXPORT2
 797 uloc_getParent(const char*    localeID,
 798                  char* parent,
 799                  int32_t parentCapacity,
 800                  UErrorCode* err);
 801
 802
 803
 804
 805 /**
 806  * Gets the full name for the specified locale, like uloc_getName(),
 807  * but without keywords.
 808  *
 809  * Note: This has the effect of 'canonicalizing' the string to
 810  * a certain extent. Upper and lower case are set as needed,
 811  * and if the components were in 'POSIX' format they are changed to
 812  * ICU format.  It does NOT map aliased names in any way.
 813  * See the top of this header file.
 814  *
 815  * This API strips off the keyword part, so "de_DE\@collation=phonebook"
 816  * will become "de_DE".
 817  * This API supports preflighting.
 818  *
 819  * @param localeID the locale to get the full name with
 820  * @param name fill in buffer for the name without keywords.
 821  * @param nameCapacity capacity of the fill in buffer.
 822  * @param err error information if retrieving the full name failed
 823  * @return the actual buffer size needed for the full name.  If it's greater
 824  * than nameCapacity, the returned full name will be truncated.
 825  * @stable ICU 2.8
 826  */
 827 U_STABLE int32_t U_EXPORT2
 828 uloc_getBaseName(const char*    localeID,
 829          char* name,
 830          int32_t nameCapacity,
 831          UErrorCode* err);
 832
 833 /**
 834  * Gets an enumeration of keywords for the specified locale. Enumeration
 835  * must get disposed of by the client using uenum_close function.
 836  *
 837  * @param localeID the locale to get the variant code with
 838  * @param status error information if retrieving the keywords failed
 839  * @return enumeration of keywords or NULL if there are no keywords.
 840  * @stable ICU 2.8
 841  */
 842 U_STABLE UEnumeration* U_EXPORT2
 843 uloc_openKeywords(const char* localeID,
 844                         UErrorCode* status);
 845
 846 /**
 847  * Get the value for a keyword. Locale name does not need to be normalized.
 848  *
 849  * @param localeID locale name containing the keyword ("de_DE@currency=EURO;collation=PHONEBOOK")
 850  * @param keywordName name of the keyword for which we want the value. Case insensitive.
 851  * @param buffer receiving buffer
 852  * @param bufferCapacity capacity of receiving buffer
 853  * @param status containing error code - buffer not big enough.
 854  * @return the length of keyword value
 855  * @stable ICU 2.8
 856  */
 857 U_STABLE int32_t U_EXPORT2
 858 uloc_getKeywordValue(const char* localeID,
 859                      const char* keywordName,
 860                      char* buffer, int32_t bufferCapacity,
 861                      UErrorCode* status);
 862
 863
 864 /**
 865  * Sets or removes the value of the specified keyword.
 866  *
 867  * For removing all keywords, use uloc_getBaseName().
 868  *
 869  * NOTE: Unlike almost every other ICU function which takes a
 870  * buffer, this function will NOT truncate the output text. If a
 871  * BUFFER_OVERFLOW_ERROR is received, it means that the original
 872  * buffer is untouched. This is done to prevent incorrect or possibly
 873  * even malformed locales from being generated and used.
 874  *
 875  * @param keywordName name of the keyword to be set. Case insensitive.
 876  * @param keywordValue value of the keyword to be set. If 0-length or
 877  *  NULL, will result in the keyword being removed. No error is given if
 878  *  that keyword does not exist.
 879  * @param buffer input buffer containing locale to be modified.
 880  * @param bufferCapacity capacity of receiving buffer
 881  * @param status containing error code - buffer not big enough.
 882  * @return the length needed for the buffer
 883  * @see uloc_getKeywordValue
 884  * @stable ICU 3.2
 885  */
 886 U_STABLE int32_t U_EXPORT2
 887 uloc_setKeywordValue(const char* keywordName,
 888                      const char* keywordValue,
 889                      char* buffer, int32_t bufferCapacity,
 890                      UErrorCode* status);
 891
 892 /**
 893  * Returns whether the locale's script is written right-to-left.
 894  * If there is no script subtag, then the likely script is used, see uloc_addLikelySubtags().
 895  * If no likely script is known, then FALSE is returned.
 896  *
 897  * A script is right-to-left according to the CLDR script metadata
 898  * which corresponds to whether the script's letters have Bidi_Class=R or AL.
 899  *
 900  * Returns TRUE for "ar" and "en-Hebr", FALSE for "zh" and "fa-Cyrl".
 901  *
 902  * @param locale input locale ID
 903  * @return TRUE if the locale's script is written right-to-left
 904  * @stable ICU 54
 905  */
 906 U_STABLE UBool U_EXPORT2
 907 uloc_isRightToLeft(const char *locale);
 908
 909 /**
 910  * enums for the  return value for the character and line orientation
 911  * functions.
 912  * @stable ICU 4.0
 913  */
 914 typedef enum {
 915   ULOC_LAYOUT_LTR   = 0,  /* left-to-right. */
 916   ULOC_LAYOUT_RTL    = 1,  /* right-to-left. */
 917   ULOC_LAYOUT_TTB    = 2,  /* top-to-bottom. */
 918   ULOC_LAYOUT_BTT    = 3,   /* bottom-to-top. */
 919   ULOC_LAYOUT_UNKNOWN
 920 } ULayoutType;
 921
 922 /**
 923  * Get the layout character orientation for the specified locale.
 924  *
 925  * @param localeId locale name
 926  * @param status Error status
 927  * @return an enum indicating the layout orientation for characters.
 928  * @stable ICU 4.0
 929  */
 930 U_STABLE ULayoutType U_EXPORT2
 931 uloc_getCharacterOrientation(const char* localeId,
 932                              UErrorCode *status);
 933
 934 /**
 935  * Get the layout line orientation for the specified locale.
 936  *
 937  * @param localeId locale name
 938  * @param status Error status
 939  * @return an enum indicating the layout orientation for lines.
 940  * @stable ICU 4.0
 941  */
 942 U_STABLE ULayoutType U_EXPORT2
 943 uloc_getLineOrientation(const char* localeId,
 944                         UErrorCode *status);
 945
 946 /**
 947  * enums for the 'outResult' parameter return value
 948  * @see uloc_acceptLanguageFromHTTP
 949  * @see uloc_acceptLanguage
 950  * @stable ICU 3.2
 951  */
 952 typedef enum {
 953   ULOC_ACCEPT_FAILED   = 0,  /* No exact match was found. */
 954   ULOC_ACCEPT_VALID    = 1,  /* An exact match was found. */
 955   ULOC_ACCEPT_FALLBACK = 2   /* A fallback was found, for example,
 956                                 Accept list contained 'ja_JP'
 957                                 which matched available locale 'ja'. */
 958 } UAcceptResult;
 959
 960
 961 /**
 962  * Based on a HTTP header from a web browser and a list of available locales,
 963  * determine an acceptable locale for the user.
 964  * @param result - buffer to accept the result locale
 965  * @param resultAvailable the size of the result buffer.
 966  * @param outResult - An out parameter that contains the fallback status
 967  * @param httpAcceptLanguage - "Accept-Language:" header as per HTTP.
 968  * @param availableLocales - list of available locales to match
 969  * @param status Error status, may be BUFFER_OVERFLOW_ERROR
 970  * @return length needed for the locale.
 971  * @stable ICU 3.2
 972  */
 973 U_STABLE int32_t U_EXPORT2
 974 uloc_acceptLanguageFromHTTP(char *result, int32_t resultAvailable,
 975                             UAcceptResult *outResult,
 976                             const char *httpAcceptLanguage,
 977                             UEnumeration* availableLocales,
 978                             UErrorCode *status);
 979
 980 /**
 981  * Based on a list of available locales,
 982  * determine an acceptable locale for the user.
 983  * @param result - buffer to accept the result locale
 984  * @param resultAvailable the size of the result buffer.
 985  * @param outResult - An out parameter that contains the fallback status
 986  * @param acceptList - list of acceptable languages
 987  * @param acceptListCount - count of acceptList items
 988  * @param availableLocales - list of available locales to match
 989  * @param status Error status, may be BUFFER_OVERFLOW_ERROR
 990  * @return length needed for the locale.
 991  * @stable ICU 3.2
 992  */
 993 U_STABLE int32_t U_EXPORT2
 994 uloc_acceptLanguage(char *result, int32_t resultAvailable,
 995                     UAcceptResult *outResult, const char **acceptList,
 996                     int32_t acceptListCount,
 997                     UEnumeration* availableLocales,
 998                     UErrorCode *status);
 999
1000
1001 /**
1002  * Gets the ICU locale ID for the specified Win32 LCID value.
1003  *
1004  * @param hostID the Win32 LCID to translate
1005  * @param locale the output buffer for the ICU locale ID, which will be NUL-terminated
1006  *  if there is room.
1007  * @param localeCapacity the size of the output buffer
1008  * @param status an error is returned if the LCID is unrecognized or the output buffer
1009  *  is too small
1010  * @return actual the actual size of the locale ID, not including NUL-termination
1011  * @stable ICU 3.8
1012  */
1013 U_STABLE int32_t U_EXPORT2
1014 uloc_getLocaleForLCID(uint32_t hostID, char *locale, int32_t localeCapacity,
1015                     UErrorCode *status);
1016
1017
1018 /**
1019  * Add the likely subtags for a provided locale ID, per the algorithm described
1020  * in the following CLDR technical report:
1021  *
1022  *   http://www.unicode.org/reports/tr35/#Likely_Subtags
1023  *
1024  * If localeID is already in the maximal form, or there is no data available
1025  * for maximization, it will be copied to the output buffer.  For example,
1026  * "und-Zzzz" cannot be maximized, since there is no reasonable maximization.
1027  *
1028  * Examples:
1029  *
1030  * "en" maximizes to "en_Latn_US"
1031  *
1032  * "de" maximizes to "de_Latn_US"
1033  *
1034  * "sr" maximizes to "sr_Cyrl_RS"
1035  *
1036  * "sh" maximizes to "sr_Latn_RS" (Note this will not reverse.)
1037  *
1038  * "zh_Hani" maximizes to "zh_Hans_CN" (Note this will not reverse.)
1039  *
1040  * @param localeID The locale to maximize
1041  * @param maximizedLocaleID The maximized locale
1042  * @param maximizedLocaleIDCapacity The capacity of the maximizedLocaleID buffer
1043  * @param err Error information if maximizing the locale failed.  If the length
1044  * of the localeID and the null-terminator is greater than the maximum allowed size,
1045  * or the localeId is not well-formed, the error code is U_ILLEGAL_ARGUMENT_ERROR.
1046  * @return The actual buffer size needed for the maximized locale.  If it's
1047  * greater than maximizedLocaleIDCapacity, the returned ID will be truncated.
1048  * On error, the return value is -1.
1049  * @stable ICU 4.0
1050  */
1051 U_STABLE int32_t U_EXPORT2
1052 uloc_addLikelySubtags(const char*    localeID,
1053          char* maximizedLocaleID,
1054          int32_t maximizedLocaleIDCapacity,
1055          UErrorCode* err);
1056
1057
1058 /**
1059  * Minimize the subtags for a provided locale ID, per the algorithm described
1060  * in the following CLDR technical report:
1061  *
1062  *   http://www.unicode.org/reports/tr35/#Likely_Subtags
1063  *
1064  * If localeID is already in the minimal form, or there is no data available
1065  * for minimization, it will be copied to the output buffer.  Since the
1066  * minimization algorithm relies on proper maximization, see the comments
1067  * for uloc_addLikelySubtags for reasons why there might not be any data.
1068  *
1069  * Examples:
1070  *
1071  * "en_Latn_US" minimizes to "en"
1072  *
1073  * "de_Latn_US" minimizes to "de"
1074  *
1075  * "sr_Cyrl_RS" minimizes to "sr"
1076  *
1077  * "zh_Hant_TW" minimizes to "zh_TW" (The region is preferred to the
1078  * script, and minimizing to "zh" would imply "zh_Hans_CN".)
1079  *
1080  * @param localeID The locale to minimize
1081  * @param minimizedLocaleID The minimized locale
1082  * @param minimizedLocaleIDCapacity The capacity of the minimizedLocaleID buffer
1083  * @param err Error information if minimizing the locale failed.  If the length
1084  * of the localeID and the null-terminator is greater than the maximum allowed size,
1085  * or the localeId is not well-formed, the error code is U_ILLEGAL_ARGUMENT_ERROR.
1086  * @return The actual buffer size needed for the minimized locale.  If it's
1087  * greater than minimizedLocaleIDCapacity, the returned ID will be truncated.
1088  * On error, the return value is -1.
1089  * @stable ICU 4.0
1090  */
1091 U_STABLE int32_t U_EXPORT2
1092 uloc_minimizeSubtags(const char*    localeID,
1093          char* minimizedLocaleID,
1094          int32_t minimizedLocaleIDCapacity,
1095          UErrorCode* err);
1096
1097 /**
1098  * Returns a locale ID for the specified BCP47 language tag string.
1099  * If the specified language tag contains any ill-formed subtags,
1100  * the first such subtag and all following subtags are ignored.
1101  * <p>
1102  * This implements the 'Language-Tag' production of BCP47, and so
1103  * supports grandfathered (regular and irregular) as well as private
1104  * use language tags.  Private use tags are represented as 'x-whatever',
1105  * and grandfathered tags are converted to their canonical replacements
1106  * where they exist.  Note that a few grandfathered tags have no modern
1107  * replacement, these will be converted using the fallback described in
1108  * the first paragraph, so some information might be lost.
1109  * @param langtag   the input BCP47 language tag.
1110  * @param localeID  the output buffer receiving a locale ID for the
1111  *                  specified BCP47 language tag.
1112  * @param localeIDCapacity  the size of the locale ID output buffer.
1113  * @param parsedLength  if not NULL, successfully parsed length
1114  *                      for the input language tag is set.
1115  * @param err       error information if receiving the locald ID
1116  *                  failed.
1117  * @return          the length of the locale ID.
1118  * @stable ICU 4.2
1119  */
1120 U_STABLE int32_t U_EXPORT2
1121 uloc_forLanguageTag(const char* langtag,
1122                     char* localeID,
1123                     int32_t localeIDCapacity,
1124                     int32_t* parsedLength,
1125                     UErrorCode* err);
1126
1127 /**
1128  * Returns a well-formed language tag for this locale ID.
1129  * <p>
1130  * <b>Note</b>: When <code>strict</code> is FALSE, any locale
1131  * fields which do not satisfy the BCP47 syntax requirement will
1132  * be omitted from the result.  When <code>strict</code> is
1133  * TRUE, this function sets U_ILLEGAL_ARGUMENT_ERROR to the
1134  * <code>err</code> if any locale fields do not satisfy the
1135  * BCP47 syntax requirement.
1136  * @param localeID  the input locale ID
1137  * @param langtag   the output buffer receiving BCP47 language
1138  *                  tag for the locale ID.
1139  * @param langtagCapacity   the size of the BCP47 language tag
1140  *                          output buffer.
1141  * @param strict    boolean value indicating if the function returns
1142  *                  an error for an ill-formed input locale ID.
1143  * @param err       error information if receiving the language
1144  *                  tag failed.
1145  * @return          The length of the BCP47 language tag.
1146  * @stable ICU 4.2
1147  */
1148 U_STABLE int32_t U_EXPORT2
1149 uloc_toLanguageTag(const char* localeID,
1150                    char* langtag,
1151                    int32_t langtagCapacity,
1152                    UBool strict,
1153                    UErrorCode* err);
1154
1155 /**
1156  * Converts the specified keyword (legacy key, or BCP 47 Unicode locale
1157  * extension key) to the equivalent BCP 47 Unicode locale extension key.
1158  * For example, BCP 47 Unicode locale extension key "co" is returned for
1159  * the input keyword "collation".
1160  * <p>
1161  * When the specified keyword is unknown, but satisfies the BCP syntax,
1162  * then the pointer to the input keyword itself will be returned.
1163  * For example,
1164  * <code>uloc_toUnicodeLocaleKey("ZZ")</code> returns "ZZ".
1165  *
1166  * @param keyword       the input locale keyword (either legacy key
1167  *                      such as "collation" or BCP 47 Unicode locale extension
1168  *                      key such as "co").
1169  * @return              the well-formed BCP 47 Unicode locale extension key,
1170  *                      or NULL if the specified locale keyword cannot be
1171  *                      mapped to a well-formed BCP 47 Unicode locale extension
1172  *                      key.
1173  * @see uloc_toLegacyKey
1174  * @stable ICU 54
1175  */
1176 U_STABLE const char* U_EXPORT2
1177 uloc_toUnicodeLocaleKey(const char* keyword);
1178
1179 /**
1180  * Converts the specified keyword value (legacy type, or BCP 47
1181  * Unicode locale extension type) to the well-formed BCP 47 Unicode locale
1182  * extension type for the specified keyword (category). For example, BCP 47
1183  * Unicode locale extension type "phonebk" is returned for the input
1184  * keyword value "phonebook", with the keyword "collation" (or "co").
1185  * <p>
1186  * When the specified keyword is not recognized, but the specified value
1187  * satisfies the syntax of the BCP 47 Unicode locale extension type,
1188  * or when the specified keyword allows 'variable' type and the specified
1189  * value satisfies the syntax,  then the pointer to the input type value itself
1190  * will be returned.
1191  * For example,
1192  * <code>uloc_toUnicodeLocaleType("Foo", "Bar")</code> returns "Bar",
1193  * <code>uloc_toUnicodeLocaleType("variableTop", "00A4")</code> returns "00A4".
1194  *
1195  * @param keyword       the locale keyword (either legacy key such as
1196  *                      "collation" or BCP 47 Unicode locale extension
1197  *                      key such as "co").
1198  * @param value         the locale keyword value (either legacy type
1199  *                      such as "phonebook" or BCP 47 Unicode locale extension
1200  *                      type such as "phonebk").
1201  * @return              the well-formed BCP47 Unicode locale extension type,
1202  *                      or NULL if the locale keyword value cannot be mapped to
1203  *                      a well-formed BCP 47 Unicode locale extension type.
1204  * @see uloc_toLegacyType
1205  * @stable ICU 54
1206  */
1207 U_STABLE const char* U_EXPORT2
1208 uloc_toUnicodeLocaleType(const char* keyword, const char* value);
1209
1210 /**
1211  * Converts the specified keyword (BCP 47 Unicode locale extension key, or
1212  * legacy key) to the legacy key. For example, legacy key "collation" is
1213  * returned for the input BCP 47 Unicode locale extension key "co".
1214  *
1215  * @param keyword       the input locale keyword (either BCP 47 Unicode locale
1216  *                      extension key or legacy key).
1217  * @return              the well-formed legacy key, or NULL if the specified
1218  *                      keyword cannot be mapped to a well-formed legacy key.
1219  * @see toUnicodeLocaleKey
1220  * @stable ICU 54
1221  */
1222 U_STABLE const char* U_EXPORT2
1223 uloc_toLegacyKey(const char* keyword);
1224
1225 /**
1226  * Converts the specified keyword value (BCP 47 Unicode locale extension type,
1227  * or legacy type or type alias) to the canonical legacy type. For example,
1228  * the legacy type "phonebook" is returned for the input BCP 47 Unicode
1229  * locale extension type "phonebk" with the keyword "collation" (or "co").
1230  * <p>
1231  * When the specified keyword is not recognized, but the specified value
1232  * satisfies the syntax of legacy key, or when the specified keyword
1233  * allows 'variable' type and the specified value satisfies the syntax,
1234  * then the pointer to the input type value itself will be returned.
1235  * For example,
1236  * <code>uloc_toLegacyType("Foo", "Bar")</code> returns "Bar",
1237  * <code>uloc_toLegacyType("vt", "00A4")</code> returns "00A4".
1238  *
1239  * @param keyword       the locale keyword (either legacy keyword such as
1240  *                      "collation" or BCP 47 Unicode locale extension
1241  *                      key such as "co").
1242  * @param value         the locale keyword value (either BCP 47 Unicode locale
1243  *                      extension type such as "phonebk" or legacy keyword value
1244  *                      such as "phonebook").
1245  * @return              the well-formed legacy type, or NULL if the specified
1246  *                      keyword value cannot be mapped to a well-formed legacy
1247  *                      type.
1248  * @see toUnicodeLocaleType
1249  * @stable ICU 54
1250  */
1251 U_STABLE const char* U_EXPORT2
1252 uloc_toLegacyType(const char* keyword, const char* value);
1253
1254 #endif /*_ULOC*/