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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
******************************************************************************
*
* Copyright (C) 1997-2016, International Business Machines
* Corporation and others. All Rights Reserved.
*
******************************************************************************
*
* FILE NAME : putilimp.h
*
* Date Name Description
* 10/17/04 grhoten Move internal functions from putil.h to this file.
******************************************************************************
*/
#ifndef PUTILIMP_H
#define PUTILIMP_H
#include "unicode/utypes.h"
#include "unicode/putil.h"
/**
* \def U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC
* Nearly all CPUs and compilers implement a right-shift of a signed integer
* as an Arithmetic Shift Right which copies the sign bit (the Most Significant Bit (MSB))
* into the vacated bits (sign extension).
* For example, (int32_t)0xfff5fff3>>4 becomes 0xffff5fff and -1>>1=-1.
*
* This can be useful for storing a signed value in the upper bits
* and another bit field in the lower bits.
* The signed value can be retrieved by simple right-shifting.
*
* This is consistent with the Java language.
*
* However, the C standard allows compilers to implement a right-shift of a signed integer
* as a Logical Shift Right which copies a 0 into the vacated bits.
* For example, (int32_t)0xfff5fff3>>4 becomes 0x0fff5fff and -1>>1=0x7fffffff.
*
* Code that depends on the natural behavior should be guarded with this macro,
* with an alternate path for unusual platforms.
* @internal
*/
#ifdef U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC
/* Use the predefined value. */
#else
/*
* Nearly all CPUs & compilers implement a right-shift of a signed integer
* as an Arithmetic Shift Right (with sign extension).
*/
# define U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC 1
#endif
/** Define this to 1 if your platform supports IEEE 754 floating point,
to 0 if it does not. */
#ifndef IEEE_754
# define IEEE_754 1
#endif
/**
* uintptr_t is an optional part of the standard definitions in stdint.h.
* The opengroup.org documentation for stdint.h says
* "On XSI-conformant systems, the intptr_t and uintptr_t types are required;
* otherwise, they are optional."
* We assume that when uintptr_t is defined, UINTPTR_MAX is defined as well.
*
* Do not use ptrdiff_t since it is signed. size_t is unsigned.
*/
/* TODO: This check fails on some z environments. Filed a ticket #9357 for this. */
#if !defined(__intptr_t_defined) && !defined(UINTPTR_MAX) && (U_PLATFORM != U_PF_OS390)
typedef size_t uintptr_t;
#endif
/*===========================================================================*/
/** @{ Information about POSIX support */
/*===========================================================================*/
#ifdef U_HAVE_NL_LANGINFO_CODESET
/* Use the predefined value. */
#elif U_PLATFORM_USES_ONLY_WIN32_API || U_PLATFORM == U_PF_ANDROID || U_PLATFORM == U_PF_QNX
# define U_HAVE_NL_LANGINFO_CODESET 0
#else
# define U_HAVE_NL_LANGINFO_CODESET 1
#endif
#ifdef U_NL_LANGINFO_CODESET
/* Use the predefined value. */
#elif !U_HAVE_NL_LANGINFO_CODESET
# define U_NL_LANGINFO_CODESET -1
#elif U_PLATFORM == U_PF_OS400
/* not defined */
#else
# define U_NL_LANGINFO_CODESET CODESET
#endif
#if defined(U_TZSET) || defined(U_HAVE_TZSET)
/* Use the predefined value. */
#elif U_PLATFORM_USES_ONLY_WIN32_API
// UWP doesn't support tzset or environment variables for tz
#if U_PLATFORM_HAS_WINUWP_API == 0
# define U_TZSET _tzset
#endif
#elif U_PLATFORM == U_PF_OS400
/* not defined */
#else
# define U_TZSET tzset
#endif
#if defined(U_TIMEZONE) || defined(U_HAVE_TIMEZONE)
/* Use the predefined value. */
#elif U_PLATFORM == U_PF_ANDROID
# define U_TIMEZONE timezone
#elif defined(__UCLIBC__)
// uClibc does not have __timezone or _timezone.
#elif defined(_NEWLIB_VERSION)
# define U_TIMEZONE _timezone
#elif defined(__GLIBC__)
// glibc
# define U_TIMEZONE __timezone
#elif U_PLATFORM_IS_LINUX_BASED
// not defined
#elif U_PLATFORM_USES_ONLY_WIN32_API
# define U_TIMEZONE _timezone
#elif U_PLATFORM == U_PF_BSD && !defined(__NetBSD__)
/* not defined */
#elif U_PLATFORM == U_PF_OS400
/* not defined */
#elif U_PLATFORM == U_PF_IPHONE
/* not defined */
#else
# define U_TIMEZONE timezone
#endif
#if defined(U_TZNAME) || defined(U_HAVE_TZNAME)
/* Use the predefined value. */
#elif U_PLATFORM_USES_ONLY_WIN32_API
/* not usable on all windows platforms */
#if U_PLATFORM_HAS_WINUWP_API == 0
# define U_TZNAME _tzname
#endif
#elif U_PLATFORM == U_PF_OS400
/* not defined */
#else
# define U_TZNAME tzname
#endif
#ifdef U_HAVE_MMAP
/* Use the predefined value. */
#elif U_PLATFORM_USES_ONLY_WIN32_API
# define U_HAVE_MMAP 0
#else
# define U_HAVE_MMAP 1
#endif
#ifdef U_HAVE_POPEN
/* Use the predefined value. */
#elif U_PLATFORM_USES_ONLY_WIN32_API
# define U_HAVE_POPEN 0
#elif U_PLATFORM == U_PF_OS400
# define U_HAVE_POPEN 0
#else
# define U_HAVE_POPEN 1
#endif
/**
* \def U_HAVE_DIRENT_H
* Defines whether dirent.h is available.
* @internal
*/
#ifdef U_HAVE_DIRENT_H
/* Use the predefined value. */
#elif U_PLATFORM_USES_ONLY_WIN32_API
# define U_HAVE_DIRENT_H 0
#else
# define U_HAVE_DIRENT_H 1
#endif
/** @} */
/*===========================================================================*/
/** @{ GCC built in functions for atomic memory operations */
/*===========================================================================*/
/**
* \def U_HAVE_GCC_ATOMICS
* @internal
*/
#ifdef U_HAVE_GCC_ATOMICS
/* Use the predefined value. */
#elif U_PLATFORM == U_PF_MINGW
#define U_HAVE_GCC_ATOMICS 0
#elif U_GCC_MAJOR_MINOR >= 404 || defined(__clang__)
/* TODO: Intel icc and IBM xlc on AIX also support gcc atomics. (Intel originated them.)
* Add them for these compilers.
* Note: Clang sets __GNUC__ defines for version 4.2, so misses the 4.4 test here.
*/
# define U_HAVE_GCC_ATOMICS 1
#else
# define U_HAVE_GCC_ATOMICS 0
#endif
/** @} */
/**
* \def U_HAVE_STD_ATOMICS
* Defines whether to use the standard C++11 <atomic> functions
* If false, ICU will fall back to compiler or platform specific alternatives.
* Note: support for these fall back options for atomics will be removed in a future version
* of ICU, and the use of C++ 11 atomics will be required.
* @internal
*/
#ifdef U_HAVE_STD_ATOMICS
/* Use the predefined value. */
#else
# define U_HAVE_STD_ATOMICS 1
#endif
/**
* \def U_HAVE_CLANG_ATOMICS
* Defines whether Clang c11 style built-in atomics are available.
* These are used in preference to gcc atomics when both are available.
*/
#ifdef U_HAVE_CLANG_ATOMICS
/* Use the predefined value. */
#elif __has_builtin(__c11_atomic_load) && \
__has_builtin(__c11_atomic_store) && \
__has_builtin(__c11_atomic_fetch_add) && \
__has_builtin(__c11_atomic_fetch_sub)
# define U_HAVE_CLANG_ATOMICS 1
#else
# define U_HAVE_CLANG_ATOMICS 0
#endif
/*===========================================================================*/
/** @{ Programs used by ICU code */
/*===========================================================================*/
/**
* \def U_MAKE_IS_NMAKE
* Defines whether the "make" program is Windows nmake.
*/
#ifdef U_MAKE_IS_NMAKE
/* Use the predefined value. */
#elif U_PLATFORM == U_PF_WINDOWS
# define U_MAKE_IS_NMAKE 1
#else
# define U_MAKE_IS_NMAKE 0
#endif
/** @} */
/*==========================================================================*/
/* Platform utilities */
/*==========================================================================*/
/**
* Platform utilities isolates the platform dependencies of the
* library. For each platform which this code is ported to, these
* functions may have to be re-implemented.
*/
/**
* Floating point utility to determine if a double is Not a Number (NaN).
* @internal
*/
U_INTERNAL UBool U_EXPORT2 uprv_isNaN(double d);
/**
* Floating point utility to determine if a double has an infinite value.
* @internal
*/
U_INTERNAL UBool U_EXPORT2 uprv_isInfinite(double d);
/**
* Floating point utility to determine if a double has a positive infinite value.
* @internal
*/
U_INTERNAL UBool U_EXPORT2 uprv_isPositiveInfinity(double d);
/**
* Floating point utility to determine if a double has a negative infinite value.
* @internal
*/
U_INTERNAL UBool U_EXPORT2 uprv_isNegativeInfinity(double d);
/**
* Floating point utility that returns a Not a Number (NaN) value.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_getNaN(void);
/**
* Floating point utility that returns an infinite value.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_getInfinity(void);
/**
* Floating point utility to truncate a double.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_trunc(double d);
/**
* Floating point utility to calculate the floor of a double.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_floor(double d);
/**
* Floating point utility to calculate the ceiling of a double.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_ceil(double d);
/**
* Floating point utility to calculate the absolute value of a double.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_fabs(double d);
/**
* Floating point utility to calculate the fractional and integer parts of a double.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_modf(double d, double* pinteger);
/**
* Floating point utility to calculate the remainder of a double divided by another double.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_fmod(double d, double y);
/**
* Floating point utility to calculate d to the power of exponent (d^exponent).
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_pow(double d, double exponent);
/**
* Floating point utility to calculate 10 to the power of exponent (10^exponent).
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_pow10(int32_t exponent);
/**
* Floating point utility to calculate the maximum value of two doubles.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_fmax(double d, double y);
/**
* Floating point utility to calculate the minimum value of two doubles.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_fmin(double d, double y);
/**
* Private utility to calculate the maximum value of two integers.
* @internal
*/
U_INTERNAL int32_t U_EXPORT2 uprv_max(int32_t d, int32_t y);
/**
* Private utility to calculate the minimum value of two integers.
* @internal
*/
U_INTERNAL int32_t U_EXPORT2 uprv_min(int32_t d, int32_t y);
#if U_IS_BIG_ENDIAN
# define uprv_isNegative(number) (*((signed char *)&(number))<0)
#else
# define uprv_isNegative(number) (*((signed char *)&(number)+sizeof(number)-1)<0)
#endif
/**
* Return the largest positive number that can be represented by an integer
* type of arbitrary bit length.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_maxMantissa(void);
/**
* Floating point utility to calculate the logarithm of a double.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_log(double d);
/**
* Does common notion of rounding e.g. uprv_floor(x + 0.5);
* @param x the double number
* @return the rounded double
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_round(double x);
/**
* Adds the signed integers a and b, storing the result in res.
* Checks for signed integer overflow.
* Similar to the GCC/Clang extension __builtin_add_overflow
*
* @param a The first operand.
* @param b The second operand.
* @param res a + b
* @return true if overflow occurred; false if no overflow occurred.
* @internal
*/
U_INTERNAL UBool U_EXPORT2 uprv_add32_overflow(int32_t a, int32_t b, int32_t* res);
/**
* Multiplies the signed integers a and b, storing the result in res.
* Checks for signed integer overflow.
* Similar to the GCC/Clang extension __builtin_mul_overflow
*
* @param a The first multiplicand.
* @param b The second multiplicand.
* @param res a * b
* @return true if overflow occurred; false if no overflow occurred.
* @internal
*/
U_INTERNAL UBool U_EXPORT2 uprv_mul32_overflow(int32_t a, int32_t b, int32_t* res);
#if 0
/**
* Returns the number of digits after the decimal point in a double number x.
*
* @param x the double number
* @return the number of digits after the decimal point in a double number x.
* @internal
*/
/*U_INTERNAL int32_t U_EXPORT2 uprv_digitsAfterDecimal(double x);*/
#endif
#if !U_CHARSET_IS_UTF8
/**
* Please use ucnv_getDefaultName() instead.
* Return the default codepage for this platform and locale.
* This function can call setlocale() on Unix platforms. Please read the
* platform documentation on setlocale() before calling this function.
* @return the default codepage for this platform
* @internal
*/
U_INTERNAL const char* U_EXPORT2 uprv_getDefaultCodepage(void);
#endif
/**
* Please use uloc_getDefault() instead.
* Return the default locale ID string by querying the system, or
* zero if one cannot be found.
* This function can call setlocale() on Unix platforms. Please read the
* platform documentation on setlocale() before calling this function.
* @return the default locale ID string
* @internal
*/
U_INTERNAL const char* U_EXPORT2 uprv_getDefaultLocaleID(void);
/**
* Time zone utilities
*
* Wrappers for C runtime library functions relating to timezones.
* The t_tzset() function (similar to tzset) uses the current setting
* of the environment variable TZ to assign values to three global
* variables: daylight, timezone, and tzname. These variables have the
* following meanings, and are declared in &lt;time.h&gt;.
*
* daylight Nonzero if daylight-saving-time zone (DST) is specified
* in TZ; otherwise, 0. Default value is 1.
* timezone Difference in seconds between coordinated universal
* time and local time. E.g., -28,800 for PST (GMT-8hrs)
* tzname(0) Three-letter time-zone name derived from TZ environment
* variable. E.g., "PST".
* tzname(1) Three-letter DST zone name derived from TZ environment
* variable. E.g., "PDT". If DST zone is omitted from TZ,
* tzname(1) is an empty string.
*
* Notes: For example, to set the TZ environment variable to correspond
* to the current time zone in Germany, you can use one of the
* following statements:
*
* set TZ=GST1GDT
* set TZ=GST+1GDT
*
* If the TZ value is not set, t_tzset() attempts to use the time zone
* information specified by the operating system. Under Windows NT
* and Windows 95, this information is specified in the Control Panel's
* Date/Time application.
* @internal
*/
U_INTERNAL void U_EXPORT2 uprv_tzset(void);
/**
* Difference in seconds between coordinated universal
* time and local time. E.g., -28,800 for PST (GMT-8hrs)
* @return the difference in seconds between coordinated universal time and local time.
* @internal
*/
U_INTERNAL int32_t U_EXPORT2 uprv_timezone(void);
/**
* tzname(0) Three-letter time-zone name derived from TZ environment
* variable. E.g., "PST".
* tzname(1) Three-letter DST zone name derived from TZ environment
* variable. E.g., "PDT". If DST zone is omitted from TZ,
* tzname(1) is an empty string.
* @internal
*/
U_INTERNAL const char* U_EXPORT2 uprv_tzname(int n);
/**
* Reset the global tzname cache.
* @internal
*/
U_INTERNAL void uprv_tzname_clear_cache();
/**
* Get UTC (GMT) time measured in milliseconds since 0:00 on 1/1/1970.
* This function is affected by 'faketime' and should be the bottleneck for all user-visible ICU time functions.
* @return the UTC time measured in milliseconds
* @internal
*/
U_INTERNAL UDate U_EXPORT2 uprv_getUTCtime(void);
/**
* Get UTC (GMT) time measured in milliseconds since 0:00 on 1/1/1970.
* This function is not affected by 'faketime', so it should only be used by low level test functions- not by anything that
* exposes time to the end user.
* @return the UTC time measured in milliseconds
* @internal
*/
U_INTERNAL UDate U_EXPORT2 uprv_getRawUTCtime(void);
/**
* Determine whether a pathname is absolute or not, as defined by the platform.
* @param path Pathname to test
* @return TRUE if the path is absolute
* @internal (ICU 3.0)
*/
U_INTERNAL UBool U_EXPORT2 uprv_pathIsAbsolute(const char *path);
/**
* Use U_MAX_PTR instead of this function.
* @param void pointer to test
* @return the largest possible pointer greater than the base
* @internal (ICU 3.8)
*/
U_INTERNAL void * U_EXPORT2 uprv_maximumPtr(void *base);
/**
* Maximum value of a (void*) - use to indicate the limit of an 'infinite' buffer.
* In fact, buffer sizes must not exceed 2GB so that the difference between
* the buffer limit and the buffer start can be expressed in an int32_t.
*
* The definition of U_MAX_PTR must fulfill the following conditions:
* - return the largest possible pointer greater than base
* - return a valid pointer according to the machine architecture (AS/400, 64-bit, etc.)
* - avoid wrapping around at high addresses
* - make sure that the returned pointer is not farther from base than 0x7fffffff bytes
*
* @param base The beginning of a buffer to find the maximum offset from
* @internal
*/
#ifndef U_MAX_PTR
# if U_PLATFORM == U_PF_OS390 && !defined(_LP64)
/* We have 31-bit pointers. */
# define U_MAX_PTR(base) ((void *)0x7fffffff)
# 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_INTERNAL void * U_EXPORT2 uprv_dl_open(const char *libName, UErrorCode *status);
/**
* Close a library
* @internal (ICU 4.4)
*/
U_INTERNAL void U_EXPORT2 uprv_dl_close( void *lib, UErrorCode *status);
/**
* Extract a symbol from a library (function)
* @internal (ICU 4.8)
*/
U_INTERNAL 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_INTERNAL 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