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// License & terms of use: http://www.unicode.org/copyright.html
/*
******************************************************************************
*
*   Copyright (C) 1997-2014, International Business Machines
*   Corporation and others.  All Rights Reserved.
*
******************************************************************************
*
*  FILE NAME : putil.h
*
*   Date        Name        Description
*   05/14/98    nos         Creation (content moved here from utypes.h).
*   06/17/99    erm         Added IEEE_754
*   07/22/98    stephen     Added IEEEremainder, max, min, trunc
*   08/13/98    stephen     Added isNegativeInfinity, isPositiveInfinity
*   08/24/98    stephen     Added longBitsFromDouble
*   03/02/99    stephen     Removed openFile().  Added AS400 support.
*   04/15/99    stephen     Converted to C
*   11/15/99    helena      Integrated S/390 changes for IEEE support.
*   01/11/00    helena      Added u_getVersion.
******************************************************************************
*/

#ifndef PUTIL_H
#define PUTIL_H

#include "unicode/utypes.h"
 /**
  * \file
  * \brief C API: Platform Utilities
  */

/*==========================================================================*/
/* Platform utilities                                                       */
/*==========================================================================*/

/**
 * Platform utilities isolates the platform dependencies of the
 * library.  For each platform which this code is ported to, these
 * functions may have to be re-implemented.
 */

/**
 * Return the ICU data directory. 
 * The data directory is where common format ICU data files (.dat files)
 *   are loaded from.  Note that normal use of the built-in ICU
 *   facilities does not require loading of an external data file;
 *   unless you are adding custom data to ICU, the data directory
 *   does not need to be set.
 *
 * The data directory is determined as follows:
 *    If u_setDataDirectory() has been called, that is it, otherwise
 *    if the ICU_DATA environment variable is set, use that, otherwise
 *    If a data directory was specified at ICU build time
 *      <code>
 * \code
 *        #define ICU_DATA_DIR "path" 
 * \endcode
 * </code> use that,
 *    otherwise no data directory is available.
 *
 * @return the data directory, or an empty string ("") if no data directory has
 *         been specified.
 *   
 * @stable ICU 2.0
 */
U_STABLE const char* U_EXPORT2 u_getDataDirectory(void);


/** 
 * Set the ICU data directory. 
 * The data directory is where common format ICU data files (.dat files)
 *   are loaded from.  Note that normal use of the built-in ICU
 *   facilities does not require loading of an external data file;
 *   unless you are adding custom data to ICU, the data directory
 *   does not need to be set.
 *
 * This function should be called at most once in a process, before the
 * first ICU operation (e.g., u_init()) that will require the loading of an
 * ICU data file.
 * This function is not thread-safe. Use it before calling ICU APIs from
 * multiple threads.
 *
 * @param directory The directory to be set.
 *
 * @see u_init
 * @stable ICU 2.0
 */
U_STABLE void U_EXPORT2 u_setDataDirectory(const char *directory);

#ifndef U_HIDE_INTERNAL_API
/**
  * Return the time zone files override directory, or an empty string if
  * no directory was specified. Certain time zone resources will be preferentially
  * loaded from individual files in this directory.
  *
  * @return the time zone data override directory.
  * @internal
  */ 
U_INTERNAL const char * U_EXPORT2 u_getTimeZoneFilesDirectory(UErrorCode *status);

/**
  * Set the time zone files override directory.
  * This function is not thread safe; it must not be called concurrently with
  *   u_getTimeZoneFilesDirectory() or any other use of ICU time zone functions.
  * This function should only be called before using any ICU service that
  *   wi