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616 lines
19 KiB
616 lines
19 KiB
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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******************************************************************************
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*
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* Copyright (C) 1997-2016, 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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* \def U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC
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* Nearly all CPUs and compilers implement a right-shift of a signed integer
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* as an Arithmetic Shift Right which copies the sign bit (the Most Significant Bit (MSB))
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* into the vacated bits (sign extension).
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* For example, (int32_t)0xfff5fff3>>4 becomes 0xffff5fff and -1>>1=-1.
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*
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* This can be useful for storing a signed value in the upper bits
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* and another bit field in the lower bits.
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* The signed value can be retrieved by simple right-shifting.
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*
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* This is consistent with the Java language.
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*
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* However, the C standard allows compilers to implement a right-shift of a signed integer
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* as a Logical Shift Right which copies a 0 into the vacated bits.
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* For example, (int32_t)0xfff5fff3>>4 becomes 0x0fff5fff and -1>>1=0x7fffffff.
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*
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* Code that depends on the natural behavior should be guarded with this macro,
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* with an alternate path for unusual platforms.
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* @internal
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*/
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#ifdef U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC
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/* Use the predefined value. */
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#else
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/*
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* Nearly all CPUs & compilers implement a right-shift of a signed integer
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* as an Arithmetic Shift Right (with sign extension).
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*/
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# define U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC 1
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#endif
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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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* uintptr_t is an optional part of the standard definitions in stdint.h.
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* The opengroup.org documentation for stdint.h says
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* "On XSI-conformant systems, the intptr_t and uintptr_t types are required;
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* otherwise, they are optional."
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* We assume that when uintptr_t is defined, UINTPTR_MAX is defined as well.
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*
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* Do not use ptrdiff_t since it is signed. size_t is unsigned.
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*/
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/* TODO: This check fails on some z environments. Filed a ticket #9357 for this. */
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#if !defined(__intptr_t_defined) && !defined(UINTPTR_MAX) && (U_PLATFORM != U_PF_OS390)
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typedef size_t uintptr_t;
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#endif
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/*===========================================================================*/
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/** @{ Information about POSIX support */
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/*===========================================================================*/
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#ifdef U_HAVE_NL_LANGINFO_CODESET
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/* Use the predefined value. */
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#elif U_PLATFORM_USES_ONLY_WIN32_API || U_PLATFORM == U_PF_ANDROID || U_PLATFORM == U_PF_QNX
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# define U_HAVE_NL_LANGINFO_CODESET 0
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#else
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# define U_HAVE_NL_LANGINFO_CODESET 1
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#endif
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#ifdef U_NL_LANGINFO_CODESET
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/* Use the predefined value. */
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#elif !U_HAVE_NL_LANGINFO_CODESET
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# define U_NL_LANGINFO_CODESET -1
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#elif U_PLATFORM == U_PF_OS400
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/* not defined */
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#else
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# define U_NL_LANGINFO_CODESET CODESET
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#endif
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#if defined(U_TZSET) || defined(U_HAVE_TZSET)
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/* Use the predefined value. */
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#elif U_PLATFORM_USES_ONLY_WIN32_API
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// UWP doesn't support tzset or environment variables for tz
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#if U_PLATFORM_HAS_WINUWP_API == 0
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# define U_TZSET _tzset
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#endif
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#elif U_PLATFORM == U_PF_OS400
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/* not defined */
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#else
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# define U_TZSET tzset
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#endif
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#if defined(U_TIMEZONE) || defined(U_HAVE_TIMEZONE)
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/* Use the predefined value. */
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#elif U_PLATFORM == U_PF_ANDROID
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# define U_TIMEZONE timezone
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#elif defined(__UCLIBC__)
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// uClibc does not have __timezone or _timezone.
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#elif defined(_NEWLIB_VERSION)
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# define U_TIMEZONE _timezone
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#elif defined(__GLIBC__)
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// glibc
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# define U_TIMEZONE __timezone
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#elif U_PLATFORM_IS_LINUX_BASED
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// not defined
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#elif U_PLATFORM_USES_ONLY_WIN32_API
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# define U_TIMEZONE _timezone
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#elif U_PLATFORM == U_PF_BSD && !defined(__NetBSD__)
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/* not defined */
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#elif U_PLATFORM == U_PF_OS400
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/* not defined */
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#elif U_PLATFORM == U_PF_IPHONE
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/* not defined */
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#else
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# define U_TIMEZONE timezone
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#endif
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#if defined(U_TZNAME) || defined(U_HAVE_TZNAME)
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/* Use the predefined value. */
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#elif U_PLATFORM_USES_ONLY_WIN32_API
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/* not usable on all windows platforms */
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#if U_PLATFORM_HAS_WINUWP_API == 0
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# define U_TZNAME _tzname
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#endif
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#elif U_PLATFORM == U_PF_OS400
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/* not defined */
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#else
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# define U_TZNAME tzname
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#endif
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#ifdef U_HAVE_MMAP
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/* Use the predefined value. */
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#elif U_PLATFORM_USES_ONLY_WIN32_API
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# define U_HAVE_MMAP 0
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#else
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# define U_HAVE_MMAP 1
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#endif
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#ifdef U_HAVE_POPEN
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/* Use the predefined value. */
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#elif U_PLATFORM_USES_ONLY_WIN32_API
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# define U_HAVE_POPEN 0
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#elif U_PLATFORM == U_PF_OS400
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# define U_HAVE_POPEN 0
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#else
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# define U_HAVE_POPEN 1
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#endif
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/**
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* \def U_HAVE_DIRENT_H
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* Defines whether dirent.h is available.
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* @internal
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*/
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#ifdef U_HAVE_DIRENT_H
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/* Use the predefined value. */
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#elif U_PLATFORM_USES_ONLY_WIN32_API
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# define U_HAVE_DIRENT_H 0
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#else
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# define U_HAVE_DIRENT_H 1
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#endif
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/** @} */
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/*===========================================================================*/
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/** @{ Programs used by ICU code */
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/*===========================================================================*/
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/**
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* \def U_MAKE_IS_NMAKE
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* Defines whether the "make" program is Windows nmake.
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*/
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#ifdef U_MAKE_IS_NMAKE
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/* Use the predefined value. */
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#elif U_PLATFORM == U_PF_WINDOWS
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# define U_MAKE_IS_NMAKE 1
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#else
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# define U_MAKE_IS_NMAKE 0
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#endif
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/** @} */
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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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* library. 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_CAPI 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_CAPI 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_CAPI 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_CAPI 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_CAPI 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_CAPI 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_CAPI 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_CAPI 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_CAPI 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_CAPI 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_CAPI 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_CAPI 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_CAPI 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_CAPI 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_CAPI 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_CAPI 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_CAPI 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_CAPI 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_CAPI double U_EXPORT2 uprv_maxMantissa(void);
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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_CAPI 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_CAPI double U_EXPORT2 uprv_round(double x);
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/**
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* Adds the signed integers a and b, storing the result in res.
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* Checks for signed integer overflow.
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* Similar to the GCC/Clang extension __builtin_add_overflow
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*
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* @param a The first operand.
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* @param b The second operand.
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* @param res a + b
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* @return true if overflow occurred; false if no overflow occurred.
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* @internal
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*/
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U_CAPI UBool U_EXPORT2 uprv_add32_overflow(int32_t a, int32_t b, int32_t* res);
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/**
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* Multiplies the signed integers a and b, storing the result in res.
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* Checks for signed integer overflow.
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* Similar to the GCC/Clang extension __builtin_mul_overflow
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*
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* @param a The first multiplicand.
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* @param b The second multiplicand.
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* @param res a * b
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* @return true if overflow occurred; false if no overflow occurred.
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* @internal
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*/
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U_CAPI UBool U_EXPORT2 uprv_mul32_overflow(int32_t a, int32_t b, int32_t* res);
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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_CAPI int32_t U_EXPORT2 uprv_digitsAfterDecimal(double x);*/
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#endif
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#if !U_CHARSET_IS_UTF8
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/**
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* Please use ucnv_getDefaultName() instead.
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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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* @internal
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*/
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U_CAPI const char* U_EXPORT2 uprv_getDefaultCodepage(void);
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#endif
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/**
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* Please use uloc_getDefault() instead.
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* Return the default locale ID string by querying the 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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* @internal
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*/
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U_CAPI const char* U_EXPORT2 uprv_getDefaultLocaleID(void);
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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_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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* @internal
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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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* @internal
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*/
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U_CAPI const char* U_EXPORT2 uprv_tzname(int n);
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/**
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* Reset the global tzname cache.
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* @internal
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*/
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U_CAPI void uprv_tzname_clear_cache(void);
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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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* This function is affected by 'faketime' and should be the bottleneck for all user-visible ICU time functions.
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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_CAPI UDate U_EXPORT2 uprv_getUTCtime(void);
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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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* This function is not affected by 'faketime', so it should only be used by low level test functions- not by anything that
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* exposes time to the end user.
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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_CAPI UDate U_EXPORT2 uprv_getRawUTCtime(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_CAPI UBool U_EXPORT2 uprv_pathIsAbsolute(const char *path);
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/**
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* Use U_MAX_PTR instead of this function.
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* @param void pointer to test
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* @return the largest possible pointer greater than the base
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* @internal (ICU 3.8)
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*/
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U_CAPI void * U_EXPORT2 uprv_maximumPtr(void *base);
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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 bytes
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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 U_PLATFORM == U_PF_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 U_PLATFORM == U_PF_OS400
|
|
# define U_MAX_PTR(base) uprv_maximumPtr((void *)base)
|
|
# elif 0
|
|
/*
|
|
* For platforms where pointers are scalar values (which is normal, but unlike i5/OS)
|
|
* but that do not define uintptr_t.
|
|
*
|
|
* However, this does not work on modern compilers:
|
|
* The C++ standard does not define pointer overflow, and allows compilers to
|
|
* assume that p+u>p for any pointer p and any integer u>0.
|
|
* Thus, modern compilers optimize away the ">" comparison.
|
|
* (See ICU tickets #7187 and #8096.)
|
|
*/
|
|
# define U_MAX_PTR(base) \
|
|
((void *)(((char *)(base)+0x7fffffffu) > (char *)(base) \
|
|
? ((char *)(base)+0x7fffffffu) \
|
|
: (char *)-1))
|
|
# else
|
|
/* Default version. C++ standard compliant for scalar pointers. */
|
|
# define U_MAX_PTR(base) \
|
|
((void *)(((uintptr_t)(base)+0x7fffffffu) > (uintptr_t)(base) \
|
|
? ((uintptr_t)(base)+0x7fffffffu) \
|
|
: (uintptr_t)-1))
|
|
# endif
|
|
#endif
|
|
|
|
|
|
#ifdef __cplusplus
|
|
/**
|
|
* Pin a buffer capacity such that doing pointer arithmetic
|
|
* on the destination pointer and capacity cannot overflow.
|
|
*
|
|
* The pinned capacity must fulfill the following conditions (for positive capacities):
|
|
* - dest + capacity is a valid pointer according to the machine arcitecture (AS/400, 64-bit, etc.)
|
|
* - (dest + capacity) >= dest
|
|
* - The size (in bytes) of T[capacity] does not exceed 0x7fffffff
|
|
*
|
|
* @param dest the destination buffer pointer.
|
|
* @param capacity the requested buffer capacity, in units of type T.
|
|
* @return the pinned capacity.
|
|
* @internal
|
|
*/
|
|
template <typename T>
|
|
inline int32_t pinCapacity(T *dest, int32_t capacity) {
|
|
if (capacity <= 0) { return capacity; }
|
|
|
|
uintptr_t destInt = (uintptr_t)dest;
|
|
uintptr_t maxInt;
|
|
|
|
# if U_PLATFORM == U_PF_OS390 && !defined(_LP64)
|
|
// We have 31-bit pointers.
|
|
maxInt = 0x7fffffff;
|
|
# elif U_PLATFORM == U_PF_OS400
|
|
maxInt = (uintptr_t)uprv_maximumPtr((void *)dest);
|
|
# else
|
|
maxInt = destInt + 0x7fffffffu;
|
|
if (maxInt < destInt) {
|
|
// Less than 2GB to the end of the address space.
|
|
// Pin to that to prevent address overflow.
|
|
maxInt = (uintptr_t)-1;
|
|
}
|
|
# endif
|
|
|
|
uintptr_t maxBytes = maxInt - destInt; // max. 2GB
|
|
int32_t maxCapacity = (int32_t)(maxBytes / sizeof(T));
|
|
return capacity <= maxCapacity ? capacity : maxCapacity;
|
|
}
|
|
#endif // __cplusplus
|
|
|
|
/* Dynamic Library Functions */
|
|
|
|
typedef void (UVoidFunction)(void);
|
|
|
|
#if U_ENABLE_DYLOAD
|
|
/**
|
|
* Load a library
|
|
* @internal (ICU 4.4)
|
|
*/
|
|
U_CAPI void * U_EXPORT2 uprv_dl_open(const char *libName, UErrorCode *status);
|
|
|
|
/**
|
|
* Close a library
|
|
* @internal (ICU 4.4)
|
|
*/
|
|
U_CAPI void U_EXPORT2 uprv_dl_close( void *lib, UErrorCode *status);
|
|
|
|
/**
|
|
* Extract a symbol from a library (function)
|
|
* @internal (ICU 4.8)
|
|
*/
|
|
U_CAPI UVoidFunction* U_EXPORT2 uprv_dlsym_func( void *lib, const char *symbolName, UErrorCode *status);
|
|
|
|
/**
|
|
* Extract a symbol from a library (function)
|
|
* Not implemented, no clients.
|
|
* @internal
|
|
*/
|
|
/* U_CAPI void * U_EXPORT2 uprv_dlsym_data( void *lib, const char *symbolName, UErrorCode *status); */
|
|
|
|
#endif
|
|
|
|
/**
|
|
* Define malloc and related functions
|
|
* @internal
|
|
*/
|
|
#if U_PLATFORM == U_PF_OS400
|
|
# define uprv_default_malloc(x) _C_TS_malloc(x)
|
|
# define uprv_default_realloc(x,y) _C_TS_realloc(x,y)
|
|
# define uprv_default_free(x) _C_TS_free(x)
|
|
/* also _C_TS_calloc(x) */
|
|
#else
|
|
/* C defaults */
|
|
# define uprv_default_malloc(x) malloc(x)
|
|
# define uprv_default_realloc(x,y) realloc(x,y)
|
|
# define uprv_default_free(x) free(x)
|
|
#endif
|
|
|
|
|
|
#endif
|