280 lines
9.3 KiB
C
280 lines
9.3 KiB
C
/*
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******************************************************************************
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*
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* Copyright (C) 1997-2005, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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******************************************************************************
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*
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* FILE NAME : putilimp.h
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*
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* Date Name Description
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* 10/17/04 grhoten Move internal functions from putil.h to this file.
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******************************************************************************
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*/
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#ifndef PUTILIMP_H
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#define PUTILIMP_H
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#include "unicode/utypes.h"
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#include "unicode/putil.h"
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/*==========================================================================*/
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/* Platform utilities */
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/*==========================================================================*/
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/**
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* Platform utilities isolates the platform dependencies of the
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* libarary. For each platform which this code is ported to, these
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* functions may have to be re-implemented.
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*/
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/**
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* Floating point utility to determine if a double is Not a Number (NaN).
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* @internal
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*/
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U_INTERNAL UBool U_EXPORT2 uprv_isNaN(double d);
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/**
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* Floating point utility to determine if a double has an infinite value.
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* @internal
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*/
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U_INTERNAL UBool U_EXPORT2 uprv_isInfinite(double d);
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/**
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* Floating point utility to determine if a double has a positive infinite value.
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* @internal
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*/
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U_INTERNAL UBool U_EXPORT2 uprv_isPositiveInfinity(double d);
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/**
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* Floating point utility to determine if a double has a negative infinite value.
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* @internal
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*/
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U_INTERNAL UBool U_EXPORT2 uprv_isNegativeInfinity(double d);
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/**
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* Floating point utility that returns a Not a Number (NaN) value.
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* @internal
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*/
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U_INTERNAL double U_EXPORT2 uprv_getNaN(void);
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/**
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* Floating point utility that returns an infinite value.
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* @internal
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*/
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U_INTERNAL double U_EXPORT2 uprv_getInfinity(void);
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/**
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* Floating point utility to truncate a double.
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* @internal
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*/
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U_INTERNAL double U_EXPORT2 uprv_trunc(double d);
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/**
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* Floating point utility to calculate the floor of a double.
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* @internal
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*/
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U_INTERNAL double U_EXPORT2 uprv_floor(double d);
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/**
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* Floating point utility to calculate the ceiling of a double.
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* @internal
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*/
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U_INTERNAL double U_EXPORT2 uprv_ceil(double d);
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/**
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* Floating point utility to calculate the absolute value of a double.
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* @internal
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*/
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U_INTERNAL double U_EXPORT2 uprv_fabs(double d);
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/**
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* Floating point utility to calculate the fractional and integer parts of a double.
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* @internal
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*/
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U_INTERNAL double U_EXPORT2 uprv_modf(double d, double* pinteger);
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/**
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* Floating point utility to calculate the remainder of a double divided by another double.
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* @internal
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*/
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U_INTERNAL double U_EXPORT2 uprv_fmod(double d, double y);
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/**
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* Floating point utility to calculate d to the power of exponent (d^exponent).
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* @internal
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*/
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U_INTERNAL double U_EXPORT2 uprv_pow(double d, double exponent);
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/**
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* Floating point utility to calculate 10 to the power of exponent (10^exponent).
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* @internal
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*/
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U_INTERNAL double U_EXPORT2 uprv_pow10(int32_t exponent);
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/**
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* Floating point utility to calculate the maximum value of two doubles.
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* @internal
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*/
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U_INTERNAL double U_EXPORT2 uprv_fmax(double d, double y);
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/**
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* Floating point utility to calculate the minimum value of two doubles.
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* @internal
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*/
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U_INTERNAL double U_EXPORT2 uprv_fmin(double d, double y);
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/**
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* Private utility to calculate the maximum value of two integers.
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* @internal
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*/
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U_INTERNAL int32_t U_EXPORT2 uprv_max(int32_t d, int32_t y);
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/**
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* Private utility to calculate the minimum value of two integers.
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* @internal
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*/
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U_INTERNAL int32_t U_EXPORT2 uprv_min(int32_t d, int32_t y);
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#if U_IS_BIG_ENDIAN
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# define uprv_isNegative(number) (*((signed char *)&(number))<0)
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#else
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# define uprv_isNegative(number) (*((signed char *)&(number)+sizeof(number)-1)<0)
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#endif
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/**
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* Return the largest positive number that can be represented by an integer
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* type of arbitrary bit length.
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* @internal
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*/
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U_INTERNAL double U_EXPORT2 uprv_maxMantissa(void);
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/**
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* Return the floor of the log base 10 of a given double.
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* This method compensates for inaccuracies which arise naturally when
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* computing logs, and always gives the correct value. The parameter
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* must be positive and finite.
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* (Thanks to Alan Liu for supplying this function.)
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*
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* @param d the double value to apply the common log function for.
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* @return the log of value d.
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* @internal
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*/
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U_INTERNAL int16_t U_EXPORT2 uprv_log10(double d);
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/**
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* Floating point utility to calculate the logarithm of a double.
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* @internal
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*/
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U_INTERNAL double U_EXPORT2 uprv_log(double d);
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/**
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* Does common notion of rounding e.g. uprv_floor(x + 0.5);
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* @param x the double number
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* @return the rounded double
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* @internal
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*/
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U_INTERNAL double U_EXPORT2 uprv_round(double x);
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#if 0
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/**
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* Returns the number of digits after the decimal point in a double number x.
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*
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* @param x the double number
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* @return the number of digits after the decimal point in a double number x.
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* @internal
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*/
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/*U_INTERNAL int32_t U_EXPORT2 uprv_digitsAfterDecimal(double x);*/
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#endif
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/**
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* Time zone utilities
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*
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* Wrappers for C runtime library functions relating to timezones.
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* The t_tzset() function (similar to tzset) uses the current setting
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* of the environment variable TZ to assign values to three global
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* variables: daylight, timezone, and tzname. These variables have the
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* following meanings, and are declared in <time.h>.
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*
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* daylight Nonzero if daylight-saving-time zone (DST) is specified
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* in TZ; otherwise, 0. Default value is 1.
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* timezone Difference in seconds between coordinated universal
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* time and local time. E.g., -28,800 for PST (GMT-8hrs)
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* tzname(0) Three-letter time-zone name derived from TZ environment
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* variable. E.g., "PST".
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* tzname(1) Three-letter DST zone name derived from TZ environment
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* variable. E.g., "PDT". If DST zone is omitted from TZ,
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* tzname(1) is an empty string.
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*
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* Notes: For example, to set the TZ environment variable to correspond
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* to the current time zone in Germany, you can use one of the
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* following statements:
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*
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* set TZ=GST1GDT
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* set TZ=GST+1GDT
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*
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* If the TZ value is not set, t_tzset() attempts to use the time zone
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* information specified by the operating system. Under Windows NT
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* and Windows 95, this information is specified in the Control Panel's
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* Date/Time application.
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* @internal
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*/
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U_INTERNAL void U_EXPORT2 uprv_tzset(void);
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/**
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* Difference in seconds between coordinated universal
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* time and local time. E.g., -28,800 for PST (GMT-8hrs)
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* @return the difference in seconds between coordinated universal time and local time.
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* @internal
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*/
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U_INTERNAL int32_t U_EXPORT2 uprv_timezone(void);
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/**
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* tzname(0) Three-letter time-zone name derived from TZ environment
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* variable. E.g., "PST".
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* tzname(1) Three-letter DST zone name derived from TZ environment
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* variable. E.g., "PDT". If DST zone is omitted from TZ,
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* tzname(1) is an empty string.
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* @internal
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*/
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U_INTERNAL const char* U_EXPORT2 uprv_tzname(int n);
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/**
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* Get UTC (GMT) time measured in milliseconds since 0:00 on 1/1/1970.
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* @return the UTC time measured in milliseconds
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* @internal
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*/
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U_INTERNAL UDate U_EXPORT2 uprv_getUTCtime(void);
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/**
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* Determine whether a pathname is absolute or not, as defined by the platform.
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* @param path Pathname to test
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* @return TRUE if the path is absolute
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* @internal (ICU 3.0)
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*/
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U_INTERNAL UBool U_EXPORT2 uprv_pathIsAbsolute(const char *path);
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/**
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* Maximum value of a (void*) - use to indicate the limit of an 'infinite' buffer.
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* In fact, buffer sizes must not exceed 2GB so that the difference between
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* the buffer limit and the buffer start can be expressed in an int32_t.
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*
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* The definition of U_MAX_PTR must fulfill the following conditions:
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* - return the largest possible pointer greater than base
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* - return a valid pointer according to the machine architecture (AS/400, 64-bit, etc.)
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* - avoid wrapping around at high addresses
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* - make sure that the returned pointer is not farther from base than 0x7fffffff
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*
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* @param base The beginning of a buffer to find the maximum offset from
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* @internal
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*/
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#ifndef U_MAX_PTR
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# if defined(OS390) && !defined(_LP64)
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/* We have 31-bit pointers. */
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# define U_MAX_PTR(base) ((void *)0x7fffffff)
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# elif defined(OS400)
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/*
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* With the provided macro we should never be out of range of a given segment
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* (a traditional/typical segment that is). Our segments have 5 bytes for the id
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* and 3 bytes for the offset. The key is that the casting takes care of only
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* retrieving the offset portion minus x1000. Hence, the smallest offset seen in
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* a program is x001000 and when casted to an int would be 0. That's why we can
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* only add 0xffefff. Otherwise, we would exceed the segment.
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*
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* Currently, 16MB is the current addressing limitation on as/400. This macro
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* may eventually be changed to use 2GB addressability for the newer version of
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* as/400 machines.
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*/
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# define U_MAX_PTR(base) ((void *)(((char *)base)-((int32_t)(base))+((int32_t)0xffefff)))
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# else
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# define U_MAX_PTR(base) ((void *)(((char *)(base)+0x7fffffffu) > (char *)(base) ? ((char *)(base)+0x7fffffffu) : (char *)-1))
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# endif
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#endif
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#endif
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