michael@0: /*
michael@0: ******************************************************************************
michael@0: *
michael@0: *   Copyright (C) 1997-2013, International Business Machines
michael@0: *   Corporation and others.  All Rights Reserved.
michael@0: *
michael@0: ******************************************************************************
michael@0: *
michael@0: *  FILE NAME : putilimp.h
michael@0: *
michael@0: *   Date        Name        Description
michael@0: *   10/17/04    grhoten     Move internal functions from putil.h to this file.
michael@0: ******************************************************************************
michael@0: */
michael@0: 
michael@0: #ifndef PUTILIMP_H
michael@0: #define PUTILIMP_H
michael@0: 
michael@0: #include "unicode/utypes.h"
michael@0: #include "unicode/putil.h"
michael@0: 
michael@0: /**
michael@0:  * \def U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC
michael@0:  * Nearly all CPUs and compilers implement a right-shift of a signed integer
michael@0:  * as an Arithmetic Shift Right which copies the sign bit (the Most Significant Bit (MSB))
michael@0:  * into the vacated bits (sign extension).
michael@0:  * For example, (int32_t)0xfff5fff3>>4 becomes 0xffff5fff and -1>>1=-1.
michael@0:  *
michael@0:  * This can be useful for storing a signed value in the upper bits
michael@0:  * and another bit field in the lower bits.
michael@0:  * The signed value can be retrieved by simple right-shifting.
michael@0:  *
michael@0:  * This is consistent with the Java language.
michael@0:  *
michael@0:  * However, the C standard allows compilers to implement a right-shift of a signed integer
michael@0:  * as a Logical Shift Right which copies a 0 into the vacated bits.
michael@0:  * For example, (int32_t)0xfff5fff3>>4 becomes 0x0fff5fff and -1>>1=0x7fffffff.
michael@0:  *
michael@0:  * Code that depends on the natural behavior should be guarded with this macro,
michael@0:  * with an alternate path for unusual platforms.
michael@0:  * @internal
michael@0:  */
michael@0: #ifdef U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC
michael@0:     /* Use the predefined value. */
michael@0: #else
michael@0:     /*
michael@0:      * Nearly all CPUs & compilers implement a right-shift of a signed integer
michael@0:      * as an Arithmetic Shift Right (with sign extension).
michael@0:      */
michael@0: #   define U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC 1
michael@0: #endif
michael@0: 
michael@0: /** Define this to 1 if your platform supports IEEE 754 floating point,
michael@0:    to 0 if it does not. */
michael@0: #ifndef IEEE_754
michael@0: #   define IEEE_754 1
michael@0: #endif
michael@0: 
michael@0: /**
michael@0:  * uintptr_t is an optional part of the standard definitions in stdint.h.
michael@0:  * The opengroup.org documentation for stdint.h says
michael@0:  * "On XSI-conformant systems, the intptr_t and uintptr_t types are required;
michael@0:  * otherwise, they are optional."
michael@0:  * We assume that when uintptr_t is defined, UINTPTR_MAX is defined as well.
michael@0:  *
michael@0:  * Do not use ptrdiff_t since it is signed. size_t is unsigned.
michael@0:  */
michael@0: /* TODO: This check fails on some z environments. Filed a ticket #9357 for this. */
michael@0: #if !defined(__intptr_t_defined) && !defined(UINTPTR_MAX) && (U_PLATFORM != U_PF_OS390)
michael@0: typedef size_t uintptr_t;
michael@0: #endif
michael@0: 
michael@0: /**
michael@0:  * \def U_HAVE_MSVC_2003_OR_EARLIER
michael@0:  * Flag for workaround of MSVC 2003 optimization bugs
michael@0:  * @internal
michael@0:  */
michael@0: #if !defined(U_HAVE_MSVC_2003_OR_EARLIER) && defined(_MSC_VER) && (_MSC_VER < 1400)
michael@0: #define U_HAVE_MSVC_2003_OR_EARLIER
michael@0: #endif
michael@0: 
michael@0: /*===========================================================================*/
michael@0: /** @{ Information about POSIX support                                       */
michael@0: /*===========================================================================*/
michael@0: 
michael@0: #ifdef U_HAVE_NL_LANGINFO_CODESET
michael@0:     /* Use the predefined value. */
michael@0: #elif U_PLATFORM_HAS_WIN32_API
michael@0: #   define U_HAVE_NL_LANGINFO_CODESET 0
michael@0: #else
michael@0: #   define U_HAVE_NL_LANGINFO_CODESET 1
michael@0: #endif
michael@0: 
michael@0: #ifdef U_NL_LANGINFO_CODESET
michael@0:     /* Use the predefined value. */
michael@0: #elif !U_HAVE_NL_LANGINFO_CODESET
michael@0: #   define U_NL_LANGINFO_CODESET -1
michael@0: #elif U_PLATFORM == U_PF_OS400
michael@0:    /* not defined */
michael@0: #else
michael@0: #   define U_NL_LANGINFO_CODESET CODESET
michael@0: #endif
michael@0: 
michael@0: #ifdef U_TZSET
michael@0:     /* Use the predefined value. */
michael@0: #elif U_PLATFORM_USES_ONLY_WIN32_API
michael@0: #   define U_TZSET _tzset
michael@0: #elif U_PLATFORM == U_PF_OS400
michael@0:    /* not defined */
michael@0: #else
michael@0: #   define U_TZSET tzset
michael@0: #endif
michael@0: 
michael@0: #if defined(U_TIMEZONE) || defined(U_HAVE_TIMEZONE)
michael@0:     /* Use the predefined value. */
michael@0: #elif U_PLATFORM == U_PF_ANDROID
michael@0: #   define U_TIMEZONE timezone
michael@0: #elif U_PLATFORM_IS_LINUX_BASED
michael@0: #   if !defined(__UCLIBC__)
michael@0:     /* __timezone is only available in glibc */
michael@0: #       define U_TIMEZONE __timezone
michael@0: #   endif
michael@0: #elif U_PLATFORM_USES_ONLY_WIN32_API
michael@0: #   define U_TIMEZONE _timezone
michael@0: #elif U_PLATFORM == U_PF_BSD && !defined(__NetBSD__)
michael@0:    /* not defined */
michael@0: #elif U_PLATFORM == U_PF_OS400
michael@0:    /* not defined */
michael@0: #elif U_PLATFORM == U_PF_IPHONE
michael@0:    /* not defined */
michael@0: #else
michael@0: #   define U_TIMEZONE timezone
michael@0: #endif
michael@0: 
michael@0: #ifdef U_TZNAME
michael@0:     /* Use the predefined value. */
michael@0: #elif U_PLATFORM_USES_ONLY_WIN32_API
michael@0: #   define U_TZNAME _tzname
michael@0: #elif U_PLATFORM == U_PF_OS400
michael@0:    /* not defined */
michael@0: #else
michael@0: #   define U_TZNAME tzname
michael@0: #endif
michael@0: 
michael@0: #ifdef U_HAVE_MMAP
michael@0:     /* Use the predefined value. */
michael@0: #elif U_PLATFORM_HAS_WIN32_API
michael@0: #   define U_HAVE_MMAP 0
michael@0: #else
michael@0: #   define U_HAVE_MMAP 1
michael@0: #endif
michael@0: 
michael@0: #ifdef U_HAVE_POPEN
michael@0:     /* Use the predefined value. */
michael@0: #elif U_PLATFORM_USES_ONLY_WIN32_API
michael@0: #   define U_HAVE_POPEN 0
michael@0: #elif U_PLATFORM == U_PF_OS400
michael@0: #   define U_HAVE_POPEN 0
michael@0: #else
michael@0: #   define U_HAVE_POPEN 1
michael@0: #endif
michael@0: 
michael@0: /**
michael@0:  * \def U_HAVE_DIRENT_H
michael@0:  * Defines whether dirent.h is available.
michael@0:  * @internal
michael@0:  */
michael@0: #ifdef U_HAVE_DIRENT_H
michael@0:     /* Use the predefined value. */
michael@0: #elif U_PLATFORM_HAS_WIN32_API
michael@0: #   define U_HAVE_DIRENT_H 0
michael@0: #else
michael@0: #   define U_HAVE_DIRENT_H 1
michael@0: #endif
michael@0: 
michael@0: /** @} */
michael@0: 
michael@0: /*===========================================================================*/
michael@0: /** @{ GCC built in functions for atomic memory operations                   */
michael@0: /*===========================================================================*/
michael@0: 
michael@0: /**
michael@0:  * \def U_HAVE_GCC_ATOMICS
michael@0:  * @internal
michael@0:  */
michael@0: #ifdef U_HAVE_GCC_ATOMICS
michael@0:     /* Use the predefined value. */
michael@0: #elif U_PLATFORM == U_PF_MINGW
michael@0:     #define U_HAVE_GCC_ATOMICS 0
michael@0: #elif U_GCC_MAJOR_MINOR >= 404 || defined(__clang__)
michael@0:     /* TODO: Intel icc and IBM xlc on AIX also support gcc atomics.  (Intel originated them.)
michael@0:      *       Add them for these compilers.
michael@0:      * Note: Clang sets __GNUC__ defines for version 4.2, so misses the 4.4 test here.
michael@0:      */
michael@0: #   define U_HAVE_GCC_ATOMICS 1
michael@0: #else
michael@0: #   define U_HAVE_GCC_ATOMICS 0
michael@0: #endif
michael@0: 
michael@0: /** @} */
michael@0: 
michael@0: /**
michael@0:  * \def U_HAVE_STD_ATOMICS
michael@0:  * Defines whether the standard C++11 <atomic> is available.
michael@0:  * ICU will use this when avialable,
michael@0:  * otherwise will fall back to compiler or platform specific alternatives.
michael@0:  * @internal
michael@0:  */
michael@0: #ifdef U_HAVE_STD_ATOMICS
michael@0:     /* Use the predefined value. */
michael@0: #elif !defined(__cplusplus) || __cplusplus<201103L
michael@0:     /* Not C++11, disable use of atomics */
michael@0: #   define U_HAVE_STD_ATOMICS 0
michael@0: #elif __clang__ && __clang_major__==3 && __clang_minor__<=1
michael@0:     /* Clang 3.1, has atomic variable initializer bug. */
michael@0: #   define U_HAVE_STD_ATOMICS 0
michael@0: #else 
michael@0:     /* U_HAVE_ATOMIC is typically set by an autoconf test of #include <atomic>  */
michael@0:     /*   Can be set manually, or left undefined, on platforms without autoconf. */
michael@0: #   if defined(U_HAVE_ATOMIC) &&  U_HAVE_ATOMIC 
michael@0: #      define U_HAVE_STD_ATOMICS 1
michael@0: #   else
michael@0: #      define U_HAVE_STD_ATOMICS 0
michael@0: #   endif
michael@0: #endif
michael@0: 
michael@0: 
michael@0: /*===========================================================================*/
michael@0: /** @{ Code alignment                                                        */
michael@0: /*===========================================================================*/
michael@0: 
michael@0: /**
michael@0:  * \def U_ALIGN_CODE
michael@0:  * This is used to align code fragments to a specific byte boundary.
michael@0:  * This is useful for getting consistent performance test results.
michael@0:  * @internal
michael@0:  */
michael@0: #ifdef U_ALIGN_CODE
michael@0:     /* Use the predefined value. */
michael@0: #elif defined(_MSC_VER) && defined(_M_IX86) && !defined(_MANAGED)
michael@0: #   define U_ALIGN_CODE(boundarySize) __asm  align boundarySize
michael@0: #else
michael@0: #   define U_ALIGN_CODE(boundarySize) 
michael@0: #endif
michael@0: 
michael@0: /** @} */
michael@0: 
michael@0: /*===========================================================================*/
michael@0: /** @{ Programs used by ICU code                                             */
michael@0: /*===========================================================================*/
michael@0: 
michael@0: /**
michael@0:  * \def U_MAKE_IS_NMAKE
michael@0:  * Defines whether the "make" program is Windows nmake.
michael@0:  */
michael@0: #ifdef U_MAKE_IS_NMAKE
michael@0:     /* Use the predefined value. */
michael@0: #elif U_PLATFORM == U_PF_WINDOWS
michael@0: #   define U_MAKE_IS_NMAKE 1
michael@0: #else
michael@0: #   define U_MAKE_IS_NMAKE 0
michael@0: #endif
michael@0: 
michael@0: /** @} */
michael@0: 
michael@0: /*==========================================================================*/
michael@0: /* Platform utilities                                                       */
michael@0: /*==========================================================================*/
michael@0: 
michael@0: /**
michael@0:  * Platform utilities isolates the platform dependencies of the
michael@0:  * libarary.  For each platform which this code is ported to, these
michael@0:  * functions may have to be re-implemented.
michael@0:  */
michael@0: 
michael@0: /**
michael@0:  * Floating point utility to determine if a double is Not a Number (NaN).
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL UBool   U_EXPORT2 uprv_isNaN(double d);
michael@0: /**
michael@0:  * Floating point utility to determine if a double has an infinite value.
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL UBool   U_EXPORT2 uprv_isInfinite(double d);
michael@0: /**
michael@0:  * Floating point utility to determine if a double has a positive infinite value.
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL UBool   U_EXPORT2 uprv_isPositiveInfinity(double d);
michael@0: /**
michael@0:  * Floating point utility to determine if a double has a negative infinite value.
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL UBool   U_EXPORT2 uprv_isNegativeInfinity(double d);
michael@0: /**
michael@0:  * Floating point utility that returns a Not a Number (NaN) value.
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL double  U_EXPORT2 uprv_getNaN(void);
michael@0: /**
michael@0:  * Floating point utility that returns an infinite value.
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL double  U_EXPORT2 uprv_getInfinity(void);
michael@0: 
michael@0: /**
michael@0:  * Floating point utility to truncate a double.
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL double  U_EXPORT2 uprv_trunc(double d);
michael@0: /**
michael@0:  * Floating point utility to calculate the floor of a double.
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL double  U_EXPORT2 uprv_floor(double d);
michael@0: /**
michael@0:  * Floating point utility to calculate the ceiling of a double.
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL double  U_EXPORT2 uprv_ceil(double d);
michael@0: /**
michael@0:  * Floating point utility to calculate the absolute value of a double.
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL double  U_EXPORT2 uprv_fabs(double d);
michael@0: /**
michael@0:  * Floating point utility to calculate the fractional and integer parts of a double.
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL double  U_EXPORT2 uprv_modf(double d, double* pinteger);
michael@0: /**
michael@0:  * Floating point utility to calculate the remainder of a double divided by another double.
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL double  U_EXPORT2 uprv_fmod(double d, double y);
michael@0: /**
michael@0:  * Floating point utility to calculate d to the power of exponent (d^exponent).
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL double  U_EXPORT2 uprv_pow(double d, double exponent);
michael@0: /**
michael@0:  * Floating point utility to calculate 10 to the power of exponent (10^exponent).
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL double  U_EXPORT2 uprv_pow10(int32_t exponent);
michael@0: /**
michael@0:  * Floating point utility to calculate the maximum value of two doubles.
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL double  U_EXPORT2 uprv_fmax(double d, double y);
michael@0: /**
michael@0:  * Floating point utility to calculate the minimum value of two doubles.
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL double  U_EXPORT2 uprv_fmin(double d, double y);
michael@0: /**
michael@0:  * Private utility to calculate the maximum value of two integers.
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL int32_t U_EXPORT2 uprv_max(int32_t d, int32_t y);
michael@0: /**
michael@0:  * Private utility to calculate the minimum value of two integers.
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL int32_t U_EXPORT2 uprv_min(int32_t d, int32_t y);
michael@0: 
michael@0: #if U_IS_BIG_ENDIAN
michael@0: #   define uprv_isNegative(number) (*((signed char *)&(number))<0)
michael@0: #else
michael@0: #   define uprv_isNegative(number) (*((signed char *)&(number)+sizeof(number)-1)<0)
michael@0: #endif
michael@0: 
michael@0: /**
michael@0:  * Return the largest positive number that can be represented by an integer
michael@0:  * type of arbitrary bit length.
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL double  U_EXPORT2 uprv_maxMantissa(void);
michael@0: 
michael@0: /**
michael@0:  * Floating point utility to calculate the logarithm of a double.
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL double  U_EXPORT2 uprv_log(double d);
michael@0: 
michael@0: /**
michael@0:  * Does common notion of rounding e.g. uprv_floor(x + 0.5);
michael@0:  * @param x the double number
michael@0:  * @return the rounded double
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL double  U_EXPORT2 uprv_round(double x);
michael@0: 
michael@0: #if 0
michael@0: /**
michael@0:  * Returns the number of digits after the decimal point in a double number x.
michael@0:  *
michael@0:  * @param x the double number
michael@0:  * @return the number of digits after the decimal point in a double number x.
michael@0:  * @internal
michael@0:  */
michael@0: /*U_INTERNAL int32_t  U_EXPORT2 uprv_digitsAfterDecimal(double x);*/
michael@0: #endif
michael@0: 
michael@0: #if !U_CHARSET_IS_UTF8
michael@0: /**
michael@0:  * Please use ucnv_getDefaultName() instead.
michael@0:  * Return the default codepage for this platform and locale.
michael@0:  * This function can call setlocale() on Unix platforms. Please read the
michael@0:  * platform documentation on setlocale() before calling this function.
michael@0:  * @return the default codepage for this platform 
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL const char*  U_EXPORT2 uprv_getDefaultCodepage(void);
michael@0: #endif
michael@0: 
michael@0: /**
michael@0:  * Please use uloc_getDefault() instead.
michael@0:  * Return the default locale ID string by querying ths system, or
michael@0:  *     zero if one cannot be found. 
michael@0:  * This function can call setlocale() on Unix platforms. Please read the
michael@0:  * platform documentation on setlocale() before calling this function.
michael@0:  * @return the default locale ID string
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL const char*  U_EXPORT2 uprv_getDefaultLocaleID(void);
michael@0: 
michael@0: /**
michael@0:  * Time zone utilities
michael@0:  *
michael@0:  * Wrappers for C runtime library functions relating to timezones.
michael@0:  * The t_tzset() function (similar to tzset) uses the current setting
michael@0:  * of the environment variable TZ to assign values to three global
michael@0:  * variables: daylight, timezone, and tzname. These variables have the
michael@0:  * following meanings, and are declared in &lt;time.h&gt;.
michael@0:  *
michael@0:  *   daylight   Nonzero if daylight-saving-time zone (DST) is specified
michael@0:  *              in TZ; otherwise, 0. Default value is 1.
michael@0:  *   timezone   Difference in seconds between coordinated universal
michael@0:  *              time and local time. E.g., -28,800 for PST (GMT-8hrs)
michael@0:  *   tzname(0)  Three-letter time-zone name derived from TZ environment
michael@0:  *              variable. E.g., "PST".
michael@0:  *   tzname(1)  Three-letter DST zone name derived from TZ environment
michael@0:  *              variable.  E.g., "PDT". If DST zone is omitted from TZ,
michael@0:  *              tzname(1) is an empty string.
michael@0:  *
michael@0:  * Notes: For example, to set the TZ environment variable to correspond
michael@0:  * to the current time zone in Germany, you can use one of the
michael@0:  * following statements:
michael@0:  *
michael@0:  *   set TZ=GST1GDT
michael@0:  *   set TZ=GST+1GDT
michael@0:  *
michael@0:  * If the TZ value is not set, t_tzset() attempts to use the time zone
michael@0:  * information specified by the operating system. Under Windows NT
michael@0:  * and Windows 95, this information is specified in the Control Panel's
michael@0:  * Date/Time application.
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL void     U_EXPORT2 uprv_tzset(void);
michael@0: 
michael@0: /**
michael@0:  * Difference in seconds between coordinated universal
michael@0:  * time and local time. E.g., -28,800 for PST (GMT-8hrs)
michael@0:  * @return the difference in seconds between coordinated universal time and local time.
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL int32_t  U_EXPORT2 uprv_timezone(void);
michael@0: 
michael@0: /**
michael@0:  *   tzname(0)  Three-letter time-zone name derived from TZ environment
michael@0:  *              variable. E.g., "PST".
michael@0:  *   tzname(1)  Three-letter DST zone name derived from TZ environment
michael@0:  *              variable.  E.g., "PDT". If DST zone is omitted from TZ,
michael@0:  *              tzname(1) is an empty string.
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL const char* U_EXPORT2 uprv_tzname(int n);
michael@0: 
michael@0: /**
michael@0:  * Get UTC (GMT) time measured in milliseconds since 0:00 on 1/1/1970.
michael@0:  * This function is affected by 'faketime' and should be the bottleneck for all user-visible ICU time functions.
michael@0:  * @return the UTC time measured in milliseconds
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL UDate U_EXPORT2 uprv_getUTCtime(void);
michael@0: 
michael@0: /**
michael@0:  * Get UTC (GMT) time measured in milliseconds since 0:00 on 1/1/1970.
michael@0:  * This function is not affected by 'faketime', so it should only be used by low level test functions- not by anything that
michael@0:  * exposes time to the end user.
michael@0:  * @return the UTC time measured in milliseconds
michael@0:  * @internal
michael@0:  */
michael@0: U_INTERNAL UDate U_EXPORT2 uprv_getRawUTCtime(void);
michael@0: 
michael@0: /**
michael@0:  * Determine whether a pathname is absolute or not, as defined by the platform.
michael@0:  * @param path Pathname to test
michael@0:  * @return TRUE if the path is absolute
michael@0:  * @internal (ICU 3.0)
michael@0:  */
michael@0: U_INTERNAL UBool U_EXPORT2 uprv_pathIsAbsolute(const char *path);
michael@0: 
michael@0: /**
michael@0:  * Use U_MAX_PTR instead of this function.
michael@0:  * @param void pointer to test
michael@0:  * @return the largest possible pointer greater than the base
michael@0:  * @internal (ICU 3.8)
michael@0:  */
michael@0: U_INTERNAL void * U_EXPORT2 uprv_maximumPtr(void *base);
michael@0: 
michael@0: /**
michael@0:  * Maximum value of a (void*) - use to indicate the limit of an 'infinite' buffer.
michael@0:  * In fact, buffer sizes must not exceed 2GB so that the difference between
michael@0:  * the buffer limit and the buffer start can be expressed in an int32_t.
michael@0:  *
michael@0:  * The definition of U_MAX_PTR must fulfill the following conditions:
michael@0:  * - return the largest possible pointer greater than base
michael@0:  * - return a valid pointer according to the machine architecture (AS/400, 64-bit, etc.)
michael@0:  * - avoid wrapping around at high addresses
michael@0:  * - make sure that the returned pointer is not farther from base than 0x7fffffff bytes
michael@0:  *
michael@0:  * @param base The beginning of a buffer to find the maximum offset from
michael@0:  * @internal
michael@0:  */
michael@0: #ifndef U_MAX_PTR
michael@0: #  if U_PLATFORM == U_PF_OS390 && !defined(_LP64)
michael@0:     /* We have 31-bit pointers. */
michael@0: #    define U_MAX_PTR(base) ((void *)0x7fffffff)
michael@0: #  elif U_PLATFORM == U_PF_OS400
michael@0: #    define U_MAX_PTR(base) uprv_maximumPtr((void *)base)
michael@0: #  elif 0
michael@0:     /*
michael@0:      * For platforms where pointers are scalar values (which is normal, but unlike i5/OS)
michael@0:      * but that do not define uintptr_t.
michael@0:      *
michael@0:      * However, this does not work on modern compilers:
michael@0:      * The C++ standard does not define pointer overflow, and allows compilers to
michael@0:      * assume that p+u>p for any pointer p and any integer u>0.
michael@0:      * Thus, modern compilers optimize away the ">" comparison.
michael@0:      * (See ICU tickets #7187 and #8096.)
michael@0:      */
michael@0: #    define U_MAX_PTR(base) \
michael@0:     ((void *)(((char *)(base)+0x7fffffffu) > (char *)(base) \
michael@0:         ? ((char *)(base)+0x7fffffffu) \
michael@0:         : (char *)-1))
michael@0: #  else
michael@0:     /* Default version. C++ standard compliant for scalar pointers. */
michael@0: #    define U_MAX_PTR(base) \
michael@0:     ((void *)(((uintptr_t)(base)+0x7fffffffu) > (uintptr_t)(base) \
michael@0:         ? ((uintptr_t)(base)+0x7fffffffu) \
michael@0:         : (uintptr_t)-1))
michael@0: #  endif
michael@0: #endif
michael@0: 
michael@0: /*  Dynamic Library Functions */
michael@0: 
michael@0: typedef void (UVoidFunction)(void);
michael@0: 
michael@0: #if U_ENABLE_DYLOAD
michael@0: /**
michael@0:  * Load a library
michael@0:  * @internal (ICU 4.4)
michael@0:  */
michael@0: U_INTERNAL void * U_EXPORT2 uprv_dl_open(const char *libName, UErrorCode *status);
michael@0: 
michael@0: /**
michael@0:  * Close a library
michael@0:  * @internal (ICU 4.4)
michael@0:  */
michael@0: U_INTERNAL void U_EXPORT2 uprv_dl_close( void *lib, UErrorCode *status);
michael@0: 
michael@0: /**
michael@0:  * Extract a symbol from a library (function)
michael@0:  * @internal (ICU 4.8)
michael@0:  */
michael@0: U_INTERNAL UVoidFunction* U_EXPORT2 uprv_dlsym_func( void *lib, const char *symbolName, UErrorCode *status);
michael@0: 
michael@0: /**
michael@0:  * Extract a symbol from a library (function)
michael@0:  * Not implemented, no clients.
michael@0:  * @internal
michael@0:  */
michael@0: /* U_INTERNAL void * U_EXPORT2 uprv_dlsym_data( void *lib, const char *symbolName, UErrorCode *status); */
michael@0: 
michael@0: #endif
michael@0: 
michael@0: /**
michael@0:  * Define malloc and related functions
michael@0:  * @internal
michael@0:  */
michael@0: #if U_PLATFORM == U_PF_OS400
michael@0: # define uprv_default_malloc(x) _C_TS_malloc(x)
michael@0: # define uprv_default_realloc(x,y) _C_TS_realloc(x,y)
michael@0: # define uprv_default_free(x) _C_TS_free(x)
michael@0: /* also _C_TS_calloc(x) */
michael@0: #else
michael@0: /* C defaults */
michael@0: # define uprv_default_malloc(x) malloc(x)
michael@0: # define uprv_default_realloc(x,y) realloc(x,y)
michael@0: # define uprv_default_free(x) free(x)
michael@0: #endif
michael@0: 
michael@0: 
michael@0: #endif