345 lines
13 KiB
C
345 lines
13 KiB
C
/*
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******************************************************************************
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*
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* Copyright (C) 1997-2001, 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 : putil.h
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*
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* Date Name Description
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* 05/14/98 nos Creation (content moved here from utypes.h).
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* 06/17/99 erm Added IEEE_754
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* 07/22/98 stephen Added IEEEremainder, max, min, trunc
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* 08/13/98 stephen Added isNegativeInfinity, isPositiveInfinity
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* 08/24/98 stephen Added longBitsFromDouble
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* 03/02/99 stephen Removed openFile(). Added AS400 support.
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* 04/15/99 stephen Converted to C
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* 11/15/99 helena Integrated S/390 changes for IEEE support.
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* 01/11/00 helena Added u_getVersion.
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******************************************************************************
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*/
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#ifndef PUTIL_H
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#define PUTIL_H
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#include "unicode/utypes.h"
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/* Define this to 1 if your platform supports IEEE 754 floating point,
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to 0 if it does not. */
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#ifndef IEEE_754
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# define IEEE_754 1
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#endif
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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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/* Floating point utilities
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*/
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U_CAPI UBool U_EXPORT2 uprv_isNaN(double);
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U_CAPI UBool U_EXPORT2 uprv_isInfinite(double);
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U_CAPI UBool U_EXPORT2 uprv_isPositiveInfinity(double);
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U_CAPI UBool U_EXPORT2 uprv_isNegativeInfinity(double);
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U_CAPI double U_EXPORT2 uprv_getNaN(void);
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U_CAPI double U_EXPORT2 uprv_getInfinity(void);
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U_CAPI double U_EXPORT2 uprv_trunc(double d);
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U_CAPI double U_EXPORT2 uprv_floor(double x);
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U_CAPI double U_EXPORT2 uprv_ceil(double x);
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U_CAPI double U_EXPORT2 uprv_fabs(double x);
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U_CAPI double U_EXPORT2 uprv_modf(double x, double* y);
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U_CAPI double U_EXPORT2 uprv_fmod(double x, double y);
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U_CAPI double U_EXPORT2 uprv_pow(double x, double y);
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U_CAPI double U_EXPORT2 uprv_pow10(int32_t x);
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U_CAPI double U_EXPORT2 uprv_fmax(double x, double y);
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U_CAPI double U_EXPORT2 uprv_fmin(double x, double y);
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U_CAPI int32_t U_EXPORT2 uprv_max(int32_t x, int32_t y);
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U_CAPI int32_t U_EXPORT2 uprv_min(int32_t x, 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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*/
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U_CAPI 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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*/
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U_CAPI int16_t U_EXPORT2 uprv_log10(double d);
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U_CAPI double U_EXPORT2 uprv_log(double d);
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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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*/
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U_CAPI double U_EXPORT2 uprv_round(double x);
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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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*/
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U_CAPI int32_t U_EXPORT2 uprv_digitsAfterDecimal(double x);
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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<65>s
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* Date/Time application.
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* @stable
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*/
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U_CAPI 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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*/
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U_CAPI 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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*/
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U_CAPI char* U_EXPORT2 uprv_tzname(int n);
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/**
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* Get UTC (GMT) time measured in seconds since 0:00 on 1/1/70.
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* @return the UTC time measured in seconds
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* @stable
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*/
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U_CAPI int32_t U_EXPORT2 uprv_getUTCtime(void);
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/**
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* Return the ICU data directory.
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* The data directory is where common format ICU data files (.dat files)
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* are loaded from. Note that normal use of the built-in ICU
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* facilities does not require loading of an external data file;
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* unless you are adding custom data to ICU, the data directory
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* does not need to be set.
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*
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* The data directory is determined as follows:
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* If u_setDataDirectory() has been called, that is it, otherwise
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* if the ICU_DATA environment variable is set, use that, otherwise
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* On Windows, if the SOFTWARE\ICU\Unicode\Data registry entry exists, use that
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* (use of the registry in this way is not recommended.) otherwise
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* If a data directory was specifed at ICU build time, use that
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* otherwise no data directory is available.
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*
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* @return the data directory, or an empty string ("") if no data directory has
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* been specified.
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*
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* @stable
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*/
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U_CAPI const char* U_EXPORT2 u_getDataDirectory(void);
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/**
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* Set the ICU data directory.
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* The data directory is where common format ICU data files (.dat files)
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* are loaded from. Note that normal use of the built-in ICU
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* facilities does not require loading of an external data file;
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* unless you are adding custom data to ICU, the data directory
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* does not need to be set.
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*
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* This function should be called at most once in a process, before the
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* first ICU operation that will require the loading of an ICU data file.
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* @param disrectory The directory to be set.
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* @stable
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*/
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U_CAPI void U_EXPORT2 u_setDataDirectory(const char *directory);
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/**
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* Return the default codepage for this platform and locale.
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* This function can call setlocale() on Unix platforms. Please read the
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* platform documentation on setlocale() before calling this function.
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* @return the default codepage for this platform
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* @stable
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*/
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U_CAPI const char* U_EXPORT2 uprv_getDefaultCodepage(void);
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/**
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* Return the default locale ID string by querying ths system, or
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* zero if one cannot be found.
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* This function can call setlocale() on Unix platforms. Please read the
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* platform documentation on setlocale() before calling this function.
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* @return the default locale ID string
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* @stable
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*/
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U_CAPI const char* U_EXPORT2 uprv_getDefaultLocaleID(void);
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#ifdef ICU_NEXTDOUBLE_USE_DEPRECATES
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/*
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* Finds the least double greater than d (if positive == true),
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* or the greatest double less than d (if positive == false).
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*
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* This is a special purpose function defined by the ChoiceFormat API
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* documentation.
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* It is not a general purpose function and not defined for NaN or Infinity
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* @return the least double greater than d (if positive == true),
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* or the greatest double less than d (if positive == false).
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* @deprecated This will be removed after 2002-Jun-30. Use the ChoiceFormat closures API instead.
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*/
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U_CAPI double U_EXPORT2 uprv_nextDouble(double d, UBool positive);
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#endif /* ICU_NEXTDOUBLE_USE_DEPRECATES */
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/**
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* Filesystem file and path separator characters.
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* Example: '/' and ':' on Unix, '\\' and ';' on Windows.
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* @stable
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*/
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#ifdef XP_MAC
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# define U_FILE_SEP_CHAR ':'
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# define U_PATH_SEP_CHAR ';'
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# define U_FILE_SEP_STRING ":"
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# define U_PATH_SEP_STRING ";"
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#elif defined(WIN32) || defined(OS2)
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# define U_FILE_SEP_CHAR '\\'
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# define U_PATH_SEP_CHAR ';'
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# define U_FILE_SEP_STRING "\\"
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# define U_PATH_SEP_STRING ";"
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#else
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# define U_FILE_SEP_CHAR '/'
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# define U_PATH_SEP_CHAR ':'
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# define U_FILE_SEP_STRING "/"
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# define U_PATH_SEP_STRING ":"
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#endif
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/**
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* Convert char characters to UChar characters.
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* This utility function is useful only for "invariant characters"
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* that are encoded in the platform default encoding.
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* They are a small, constant subset of the encoding and include
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* just the latin letters, digits, and some punctuation.
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* For details, see utypes.h .
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*
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* @param cs Input string, points to <code>length</code>
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* character bytes from a subset of the platform encoding.
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* @param us Output string, points to memory for <code>length</code>
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* Unicode characters.
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* @param length The number of characters to convert; this may
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* include the terminating <code>NUL</code>.
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* @stable
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*/
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U_CAPI void U_EXPORT2
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u_charsToUChars(const char *cs, UChar *us, int32_t length);
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/**
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* Convert UChar characters to char characters.
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* This utility function is useful only for "invariant characters"
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* that can be encoded in the platform default encoding.
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* They are a small, constant subset of the encoding and include
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* just the latin letters, digits, and some punctuation.
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* For details, see utypes.h .
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*
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* @param us Input string, points to <code>length</code>
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* Unicode characters that can be encoded with the
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* codepage-invariant subset of the platform encoding.
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* @param cs Output string, points to memory for <code>length</code>
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* character bytes.
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* @param length The number of characters to convert; this may
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* include the terminating <code>NUL</code>.
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* @stable
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*/
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U_CAPI void U_EXPORT2
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u_UCharsToChars(const UChar *us, char *cs, int32_t length);
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/* Define U_UPPER_ORDINAL */
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#if U_CHARSET_FAMILY==U_ASCII_FAMILY
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# define U_UPPER_ORDINAL(x) ((x)-'A')
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#elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY
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# define U_UPPER_ORDINAL(x) (((x) < 'J') ? ((x)-'A') : \
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(((x) < 'S') ? ((x)-'J'+9) : \
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((x)-'S'+18)))
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#else
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# error Unknown charset family!
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#endif
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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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# ifdef OS390
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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)+0x7fffffff) > (char *)(base) ? ((char *)(base)+0x7fffffff) : (char *)-1))
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# endif
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#endif
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#endif
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