icuSources/common/putilimp.h

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /*
   4 ******************************************************************************
   5 *
   6 *   Copyright (C) 1997-2016, International Business Machines
   7 *   Corporation and others.  All Rights Reserved.
   8 *
   9 ******************************************************************************
  10 *
  11 *  FILE NAME : putilimp.h
  12 *
  13 *   Date        Name        Description
  14 *   10/17/04    grhoten     Move internal functions from putil.h to this file.
  15 ******************************************************************************
  16 */
  17
  18 #ifndef PUTILIMP_H
  19 #define PUTILIMP_H
  20
  21 #include "unicode/utypes.h"
  22 #include "unicode/putil.h"
  23
  24 /**
  25  * \def U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC
  26  * Nearly all CPUs and compilers implement a right-shift of a signed integer
  27  * as an Arithmetic Shift Right which copies the sign bit (the Most Significant Bit (MSB))
  28  * into the vacated bits (sign extension).
  29  * For example, (int32_t)0xfff5fff3>>4 becomes 0xffff5fff and -1>>1=-1.
  30  *
  31  * This can be useful for storing a signed value in the upper bits
  32  * and another bit field in the lower bits.
  33  * The signed value can be retrieved by simple right-shifting.
  34  *
  35  * This is consistent with the Java language.
  36  *
  37  * However, the C standard allows compilers to implement a right-shift of a signed integer
  38  * as a Logical Shift Right which copies a 0 into the vacated bits.
  39  * For example, (int32_t)0xfff5fff3>>4 becomes 0x0fff5fff and -1>>1=0x7fffffff.
  40  *
  41  * Code that depends on the natural behavior should be guarded with this macro,
  42  * with an alternate path for unusual platforms.
  43  * @internal
  44  */
  45 #ifdef U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC
  46     /* Use the predefined value. */
  47 #else
  48     /*
  49      * Nearly all CPUs & compilers implement a right-shift of a signed integer
  50      * as an Arithmetic Shift Right (with sign extension).
  51      */
  52 #   define U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC 1
  53 #endif
  54
  55 /** Define this to 1 if your platform supports IEEE 754 floating point,
  56    to 0 if it does not. */
  57 #ifndef IEEE_754
  58 #   define IEEE_754 1
  59 #endif
  60
  61 /**
  62  * uintptr_t is an optional part of the standard definitions in stdint.h.
  63  * The opengroup.org documentation for stdint.h says
  64  * "On XSI-conformant systems, the intptr_t and uintptr_t types are required;
  65  * otherwise, they are optional."
  66  * We assume that when uintptr_t is defined, UINTPTR_MAX is defined as well.
  67  *
  68  * Do not use ptrdiff_t since it is signed. size_t is unsigned.
  69  */
  70 /* TODO: This check fails on some z environments. Filed a ticket #9357 for this. */
  71 #if !defined(__intptr_t_defined) && !defined(UINTPTR_MAX) && (U_PLATFORM != U_PF_OS390)
  72 typedef size_t uintptr_t;
  73 #endif
  74
  75 /*===========================================================================*/
  76 /** @{ Information about POSIX support                                       */
  77 /*===========================================================================*/
  78
  79 #ifdef U_HAVE_NL_LANGINFO_CODESET
  80     /* Use the predefined value. */
  81 #elif U_PLATFORM_USES_ONLY_WIN32_API || U_PLATFORM == U_PF_ANDROID || U_PLATFORM == U_PF_QNX
  82 #   define U_HAVE_NL_LANGINFO_CODESET 0
  83 #else
  84 #   define U_HAVE_NL_LANGINFO_CODESET 1
  85 #endif
  86
  87 #ifdef U_NL_LANGINFO_CODESET
  88     /* Use the predefined value. */
  89 #elif !U_HAVE_NL_LANGINFO_CODESET
  90 #   define U_NL_LANGINFO_CODESET -1
  91 #elif U_PLATFORM == U_PF_OS400
  92    /* not defined */
  93 #else
  94 #   define U_NL_LANGINFO_CODESET CODESET
  95 #endif
  96
  97 #ifdef U_TZSET
  98     /* Use the predefined value. */
  99 #elif U_PLATFORM_USES_ONLY_WIN32_API
 100     // UWP doesn't support tzset or environment variables for tz
 101 #if U_PLATFORM_HAS_WINUWP_API == 0
 102 #   define U_TZSET _tzset
 103 #endif
 104 #elif U_PLATFORM == U_PF_OS400
 105    /* not defined */
 106 #else
 107 #   define U_TZSET tzset
 108 #endif
 109
 110 #if defined(U_TIMEZONE) || defined(U_HAVE_TIMEZONE)
 111     /* Use the predefined value. */
 112 #elif U_PLATFORM == U_PF_ANDROID
 113 #   define U_TIMEZONE timezone
 114 #elif defined(__UCLIBC__)
 115     // uClibc does not have __timezone or _timezone.
 116 #elif defined(_NEWLIB_VERSION)
 117 #   define U_TIMEZONE _timezone
 118 #elif defined(__GLIBC__)
 119     // glibc
 120 #   define U_TIMEZONE __timezone
 121 #elif U_PLATFORM_IS_LINUX_BASED
 122     // not defined
 123 #elif U_PLATFORM_USES_ONLY_WIN32_API
 124 #   define U_TIMEZONE _timezone
 125 #elif U_PLATFORM == U_PF_BSD && !defined(__NetBSD__)
 126    /* not defined */
 127 #elif U_PLATFORM == U_PF_OS400
 128    /* not defined */
 129 #elif U_PLATFORM == U_PF_IPHONE
 130    /* not defined */
 131 #else
 132 #   define U_TIMEZONE timezone
 133 #endif
 134
 135 #ifdef U_TZNAME
 136     /* Use the predefined value. */
 137 #elif U_PLATFORM_USES_ONLY_WIN32_API
 138     /* not usable on all windows platforms */
 139 #if U_PLATFORM_HAS_WINUWP_API == 0
 140 #   define U_TZNAME _tzname
 141 #endif
 142 #elif U_PLATFORM == U_PF_OS400
 143    /* not defined */
 144 #else
 145 #   define U_TZNAME tzname
 146 #endif
 147
 148 #ifdef U_HAVE_MMAP
 149     /* Use the predefined value. */
 150 #elif U_PLATFORM_USES_ONLY_WIN32_API
 151 #   define U_HAVE_MMAP 0
 152 #else
 153 #   define U_HAVE_MMAP 1
 154 #endif
 155
 156 #ifdef U_HAVE_POPEN
 157     /* Use the predefined value. */
 158 #elif U_PLATFORM_USES_ONLY_WIN32_API
 159 #   define U_HAVE_POPEN 0
 160 #elif U_PLATFORM == U_PF_OS400
 161 #   define U_HAVE_POPEN 0
 162 #else
 163 #   define U_HAVE_POPEN 1
 164 #endif
 165
 166 /**
 167  * \def U_HAVE_DIRENT_H
 168  * Defines whether dirent.h is available.
 169  * @internal
 170  */
 171 #ifdef U_HAVE_DIRENT_H
 172     /* Use the predefined value. */
 173 #elif U_PLATFORM_USES_ONLY_WIN32_API
 174 #   define U_HAVE_DIRENT_H 0
 175 #else
 176 #   define U_HAVE_DIRENT_H 1
 177 #endif
 178
 179 /** @} */
 180
 181 /*===========================================================================*/
 182 /** @{ GCC built in functions for atomic memory operations                   */
 183 /*===========================================================================*/
 184
 185 /**
 186  * \def U_HAVE_GCC_ATOMICS
 187  * @internal
 188  */
 189 #ifdef U_HAVE_GCC_ATOMICS
 190     /* Use the predefined value. */
 191 #elif U_PLATFORM == U_PF_MINGW
 192     #define U_HAVE_GCC_ATOMICS 0
 193 #elif U_GCC_MAJOR_MINOR >= 404 || defined(__clang__)
 194     /* TODO: Intel icc and IBM xlc on AIX also support gcc atomics.  (Intel originated them.)
 195      *       Add them for these compilers.
 196      * Note: Clang sets __GNUC__ defines for version 4.2, so misses the 4.4 test here.
 197      */
 198 #   define U_HAVE_GCC_ATOMICS 1
 199 #else
 200 #   define U_HAVE_GCC_ATOMICS 0
 201 #endif
 202
 203 /** @} */
 204
 205 /**
 206  * \def U_HAVE_STD_ATOMICS
 207  * Defines whether the standard C++11 <atomic> is available.
 208  * ICU will use this when available,
 209  * otherwise will fall back to compiler or platform specific alternatives.
 210  * @internal
 211  */
 212 #ifdef U_HAVE_STD_ATOMICS
 213     /* Use the predefined value. */
 214 #elif U_CPLUSPLUS_VERSION < 11
 215     /* Not C++11, disable use of atomics */
 216 #   define U_HAVE_STD_ATOMICS 0
 217 #elif __clang__ && __clang_major__==3 && __clang_minor__<=1
 218     /* Clang 3.1, has atomic variable initializer bug. */
 219 #   define U_HAVE_STD_ATOMICS 0
 220 #else
 221     /* U_HAVE_ATOMIC is typically set by an autoconf test of #include <atomic>  */
 222     /*   Can be set manually, or left undefined, on platforms without autoconf. */
 223 #   if defined(U_HAVE_ATOMIC) &&  U_HAVE_ATOMIC
 224 #      define U_HAVE_STD_ATOMICS 1
 225 #   else
 226 #      define U_HAVE_STD_ATOMICS 0
 227 #   endif
 228 #endif
 229
 230
 231 /**
 232  *  \def U_HAVE_CLANG_ATOMICS
 233  *  Defines whether Clang c11 style built-in atomics are available.
 234  *  These are used in preference to gcc atomics when both are available.
 235  */
 236 #ifdef U_HAVE_CLANG_ATOMICS
 237     /* Use the predefined value. */
 238 #elif __has_builtin(__c11_atomic_load) && \
 239     __has_builtin(__c11_atomic_store) && \
 240     __has_builtin(__c11_atomic_fetch_add) && \
 241     __has_builtin(__c11_atomic_fetch_sub)
 242 #    define U_HAVE_CLANG_ATOMICS 1
 243 #else
 244 #    define U_HAVE_CLANG_ATOMICS 0
 245 #endif
 246
 247 /*===========================================================================*/
 248 /** @{ Programs used by ICU code                                             */
 249 /*===========================================================================*/
 250
 251 /**
 252  * \def U_MAKE_IS_NMAKE
 253  * Defines whether the "make" program is Windows nmake.
 254  */
 255 #ifdef U_MAKE_IS_NMAKE
 256     /* Use the predefined value. */
 257 #elif U_PLATFORM == U_PF_WINDOWS
 258 #   define U_MAKE_IS_NMAKE 1
 259 #else
 260 #   define U_MAKE_IS_NMAKE 0
 261 #endif
 262
 263 /** @} */
 264
 265 /*==========================================================================*/
 266 /* Platform utilities                                                       */
 267 /*==========================================================================*/
 268
 269 /**
 270  * Platform utilities isolates the platform dependencies of the
 271  * library.  For each platform which this code is ported to, these
 272  * functions may have to be re-implemented.
 273  */
 274
 275 /**
 276  * Floating point utility to determine if a double is Not a Number (NaN).
 277  * @internal
 278  */
 279 U_INTERNAL UBool   U_EXPORT2 uprv_isNaN(double d);
 280 /**
 281  * Floating point utility to determine if a double has an infinite value.
 282  * @internal
 283  */
 284 U_INTERNAL UBool   U_EXPORT2 uprv_isInfinite(double d);
 285 /**
 286  * Floating point utility to determine if a double has a positive infinite value.
 287  * @internal
 288  */
 289 U_INTERNAL UBool   U_EXPORT2 uprv_isPositiveInfinity(double d);
 290 /**
 291  * Floating point utility to determine if a double has a negative infinite value.
 292  * @internal
 293  */
 294 U_INTERNAL UBool   U_EXPORT2 uprv_isNegativeInfinity(double d);
 295 /**
 296  * Floating point utility that returns a Not a Number (NaN) value.
 297  * @internal
 298  */
 299 U_INTERNAL double  U_EXPORT2 uprv_getNaN(void);
 300 /**
 301  * Floating point utility that returns an infinite value.
 302  * @internal
 303  */
 304 U_INTERNAL double  U_EXPORT2 uprv_getInfinity(void);
 305
 306 /**
 307  * Floating point utility to truncate a double.
 308  * @internal
 309  */
 310 U_INTERNAL double  U_EXPORT2 uprv_trunc(double d);
 311 /**
 312  * Floating point utility to calculate the floor of a double.
 313  * @internal
 314  */
 315 U_INTERNAL double  U_EXPORT2 uprv_floor(double d);
 316 /**
 317  * Floating point utility to calculate the ceiling of a double.
 318  * @internal
 319  */
 320 U_INTERNAL double  U_EXPORT2 uprv_ceil(double d);
 321 /**
 322  * Floating point utility to calculate the absolute value of a double.
 323  * @internal
 324  */
 325 U_INTERNAL double  U_EXPORT2 uprv_fabs(double d);
 326 /**
 327  * Floating point utility to calculate the fractional and integer parts of a double.
 328  * @internal
 329  */
 330 U_INTERNAL double  U_EXPORT2 uprv_modf(double d, double* pinteger);
 331 /**
 332  * Floating point utility to calculate the remainder of a double divided by another double.
 333  * @internal
 334  */
 335 U_INTERNAL double  U_EXPORT2 uprv_fmod(double d, double y);
 336 /**
 337  * Floating point utility to calculate d to the power of exponent (d^exponent).
 338  * @internal
 339  */
 340 U_INTERNAL double  U_EXPORT2 uprv_pow(double d, double exponent);
 341 /**
 342  * Floating point utility to calculate 10 to the power of exponent (10^exponent).
 343  * @internal
 344  */
 345 U_INTERNAL double  U_EXPORT2 uprv_pow10(int32_t exponent);
 346 /**
 347  * Floating point utility to calculate the maximum value of two doubles.
 348  * @internal
 349  */
 350 U_INTERNAL double  U_EXPORT2 uprv_fmax(double d, double y);
 351 /**
 352  * Floating point utility to calculate the minimum value of two doubles.
 353  * @internal
 354  */
 355 U_INTERNAL double  U_EXPORT2 uprv_fmin(double d, double y);
 356 /**
 357  * Private utility to calculate the maximum value of two integers.
 358  * @internal
 359  */
 360 U_INTERNAL int32_t U_EXPORT2 uprv_max(int32_t d, int32_t y);
 361 /**
 362  * Private utility to calculate the minimum value of two integers.
 363  * @internal
 364  */
 365 U_INTERNAL int32_t U_EXPORT2 uprv_min(int32_t d, int32_t y);
 366
 367 #if U_IS_BIG_ENDIAN
 368 #   define uprv_isNegative(number) (*((signed char *)&(number))<0)
 369 #else
 370 #   define uprv_isNegative(number) (*((signed char *)&(number)+sizeof(number)-1)<0)
 371 #endif
 372
 373 /**
 374  * Return the largest positive number that can be represented by an integer
 375  * type of arbitrary bit length.
 376  * @internal
 377  */
 378 U_INTERNAL double  U_EXPORT2 uprv_maxMantissa(void);
 379
 380 /**
 381  * Floating point utility to calculate the logarithm of a double.
 382  * @internal
 383  */
 384 U_INTERNAL double  U_EXPORT2 uprv_log(double d);
 385
 386 /**
 387  * Does common notion of rounding e.g. uprv_floor(x + 0.5);
 388  * @param x the double number
 389  * @return the rounded double
 390  * @internal
 391  */
 392 U_INTERNAL double  U_EXPORT2 uprv_round(double x);
 393
 394 /**
 395  * Adds the signed integers a and b, storing the result in res.
 396  * Checks for signed integer overflow.
 397  * Similar to the GCC/Clang extension __builtin_add_overflow
 398  *
 399  * @param a The first operand.
 400  * @param b The second operand.
 401  * @param res a + b
 402  * @return true if overflow occurred; false if no overflow occurred.
 403  * @internal
 404  */
 405 U_INTERNAL UBool U_EXPORT2 uprv_add32_overflow(int32_t a, int32_t b, int32_t* res);
 406
 407 /**
 408  * Multiplies the signed integers a and b, storing the result in res.
 409  * Checks for signed integer overflow.
 410  * Similar to the GCC/Clang extension __builtin_mul_overflow
 411  *
 412  * @param a The first multiplicand.
 413  * @param b The second multiplicand.
 414  * @param res a * b
 415  * @return true if overflow occurred; false if no overflow occurred.
 416  * @internal
 417  */
 418 U_INTERNAL UBool U_EXPORT2 uprv_mul32_overflow(int32_t a, int32_t b, int32_t* res);
 419
 420 #if 0
 421 /**
 422  * Returns the number of digits after the decimal point in a double number x.
 423  *
 424  * @param x the double number
 425  * @return the number of digits after the decimal point in a double number x.
 426  * @internal
 427  */
 428 /*U_INTERNAL int32_t  U_EXPORT2 uprv_digitsAfterDecimal(double x);*/
 429 #endif
 430
 431 #if !U_CHARSET_IS_UTF8
 432 /**
 433  * Please use ucnv_getDefaultName() instead.
 434  * Return the default codepage for this platform and locale.
 435  * This function can call setlocale() on Unix platforms. Please read the
 436  * platform documentation on setlocale() before calling this function.
 437  * @return the default codepage for this platform
 438  * @internal
 439  */
 440 U_INTERNAL const char*  U_EXPORT2 uprv_getDefaultCodepage(void);
 441 #endif
 442
 443 /**
 444  * Please use uloc_getDefault() instead.
 445  * Return the default locale ID string by querying the system, or
 446  *     zero if one cannot be found.
 447  * This function can call setlocale() on Unix platforms. Please read the
 448  * platform documentation on setlocale() before calling this function.
 449  * @return the default locale ID string
 450  * @internal
 451  */
 452 U_INTERNAL const char*  U_EXPORT2 uprv_getDefaultLocaleID(void);
 453
 454 /**
 455  * Time zone utilities
 456  *
 457  * Wrappers for C runtime library functions relating to timezones.
 458  * The t_tzset() function (similar to tzset) uses the current setting
 459  * of the environment variable TZ to assign values to three global
 460  * variables: daylight, timezone, and tzname. These variables have the
 461  * following meanings, and are declared in &lt;time.h&gt;.
 462  *
 463  *   daylight   Nonzero if daylight-saving-time zone (DST) is specified
 464  *              in TZ; otherwise, 0. Default value is 1.
 465  *   timezone   Difference in seconds between coordinated universal
 466  *              time and local time. E.g., -28,800 for PST (GMT-8hrs)
 467  *   tzname(0)  Three-letter time-zone name derived from TZ environment
 468  *              variable. E.g., "PST".
 469  *   tzname(1)  Three-letter DST zone name derived from TZ environment
 470  *              variable.  E.g., "PDT". If DST zone is omitted from TZ,
 471  *              tzname(1) is an empty string.
 472  *
 473  * Notes: For example, to set the TZ environment variable to correspond
 474  * to the current time zone in Germany, you can use one of the
 475  * following statements:
 476  *
 477  *   set TZ=GST1GDT
 478  *   set TZ=GST+1GDT
 479  *
 480  * If the TZ value is not set, t_tzset() attempts to use the time zone
 481  * information specified by the operating system. Under Windows NT
 482  * and Windows 95, this information is specified in the Control Panel's
 483  * Date/Time application.
 484  * @internal
 485  */
 486 U_INTERNAL void     U_EXPORT2 uprv_tzset(void);
 487
 488 /**
 489  * Difference in seconds between coordinated universal
 490  * time and local time. E.g., -28,800 for PST (GMT-8hrs)
 491  * @return the difference in seconds between coordinated universal time and local time.
 492  * @internal
 493  */
 494 U_INTERNAL int32_t  U_EXPORT2 uprv_timezone(void);
 495
 496 /**
 497  *   tzname(0)  Three-letter time-zone name derived from TZ environment
 498  *              variable. E.g., "PST".
 499  *   tzname(1)  Three-letter DST zone name derived from TZ environment
 500  *              variable.  E.g., "PDT". If DST zone is omitted from TZ,
 501  *              tzname(1) is an empty string.
 502  * @internal
 503  */
 504 U_INTERNAL const char* U_EXPORT2 uprv_tzname(int n);
 505
 506 /**
 507  * Reset the global tzname cache.
 508  * @internal
 509  */
 510 U_INTERNAL void uprv_tzname_clear_cache();
 511
 512 /**
 513  * Get UTC (GMT) time measured in milliseconds since 0:00 on 1/1/1970.
 514  * This function is affected by 'faketime' and should be the bottleneck for all user-visible ICU time functions.
 515  * @return the UTC time measured in milliseconds
 516  * @internal
 517  */
 518 U_INTERNAL UDate U_EXPORT2 uprv_getUTCtime(void);
 519
 520 /**
 521  * Get UTC (GMT) time measured in milliseconds since 0:00 on 1/1/1970.
 522  * This function is not affected by 'faketime', so it should only be used by low level test functions- not by anything that
 523  * exposes time to the end user.
 524  * @return the UTC time measured in milliseconds
 525  * @internal
 526  */
 527 U_INTERNAL UDate U_EXPORT2 uprv_getRawUTCtime(void);
 528
 529 /**
 530  * Determine whether a pathname is absolute or not, as defined by the platform.
 531  * @param path Pathname to test
 532  * @return TRUE if the path is absolute
 533  * @internal (ICU 3.0)
 534  */
 535 U_INTERNAL UBool U_EXPORT2 uprv_pathIsAbsolute(const char *path);
 536
 537 /**
 538  * Use U_MAX_PTR instead of this function.
 539  * @param void pointer to test
 540  * @return the largest possible pointer greater than the base
 541  * @internal (ICU 3.8)
 542  */
 543 U_INTERNAL void * U_EXPORT2 uprv_maximumPtr(void *base);
 544
 545 /**
 546  * Maximum value of a (void*) - use to indicate the limit of an 'infinite' buffer.
 547  * In fact, buffer sizes must not exceed 2GB so that the difference between
 548  * the buffer limit and the buffer start can be expressed in an int32_t.
 549  *
 550  * The definition of U_MAX_PTR must fulfill the following conditions:
 551  * - return the largest possible pointer greater than base
 552  * - return a valid pointer according to the machine architecture (AS/400, 64-bit, etc.)
 553  * - avoid wrapping around at high addresses
 554  * - make sure that the returned pointer is not farther from base than 0x7fffffff bytes
 555  *
 556  * @param base The beginning of a buffer to find the maximum offset from
 557  * @internal
 558  */
 559 #ifndef U_MAX_PTR
 560 #  if U_PLATFORM == U_PF_OS390 && !defined(_LP64)
 561     /* We have 31-bit pointers. */
 562 #    define U_MAX_PTR(base) ((void *)0x7fffffff)
 563 #  elif U_PLATFORM == U_PF_OS400
 564 #    define U_MAX_PTR(base) uprv_maximumPtr((void *)base)
 565 #  elif 0
 566     /*
 567      * For platforms where pointers are scalar values (which is normal, but unlike i5/OS)
 568      * but that do not define uintptr_t.
 569      *
 570      * However, this does not work on modern compilers:
 571      * The C++ standard does not define pointer overflow, and allows compilers to
 572      * assume that p+u>p for any pointer p and any integer u>0.
 573      * Thus, modern compilers optimize away the ">" comparison.
 574      * (See ICU tickets #7187 and #8096.)
 575      */
 576 #    define U_MAX_PTR(base) \
 577     ((void *)(((char *)(base)+0x7fffffffu) > (char *)(base) \
 578         ? ((char *)(base)+0x7fffffffu) \
 579         : (char *)-1))
 580 #  else
 581     /* Default version. C++ standard compliant for scalar pointers. */
 582 #    define U_MAX_PTR(base) \
 583     ((void *)(((uintptr_t)(base)+0x7fffffffu) > (uintptr_t)(base) \
 584         ? ((uintptr_t)(base)+0x7fffffffu) \
 585         : (uintptr_t)-1))
 586 #  endif
 587 #endif
 588
 589 /*  Dynamic Library Functions */
 590
 591 typedef void (UVoidFunction)(void);
 592
 593 #if U_ENABLE_DYLOAD
 594 /**
 595  * Load a library
 596  * @internal (ICU 4.4)
 597  */
 598 U_INTERNAL void * U_EXPORT2 uprv_dl_open(const char *libName, UErrorCode *status);
 599
 600 /**
 601  * Close a library
 602  * @internal (ICU 4.4)
 603  */
 604 U_INTERNAL void U_EXPORT2 uprv_dl_close( void *lib, UErrorCode *status);
 605
 606 /**
 607  * Extract a symbol from a library (function)
 608  * @internal (ICU 4.8)
 609  */
 610 U_INTERNAL UVoidFunction* U_EXPORT2 uprv_dlsym_func( void *lib, const char *symbolName, UErrorCode *status);
 611
 612 /**
 613  * Extract a symbol from a library (function)
 614  * Not implemented, no clients.
 615  * @internal
 616  */
 617 /* U_INTERNAL void * U_EXPORT2 uprv_dlsym_data( void *lib, const char *symbolName, UErrorCode *status); */
 618
 619 #endif
 620
 621 /**
 622  * Define malloc and related functions
 623  * @internal
 624  */
 625 #if U_PLATFORM == U_PF_OS400
 626 # define uprv_default_malloc(x) _C_TS_malloc(x)
 627 # define uprv_default_realloc(x,y) _C_TS_realloc(x,y)
 628 # define uprv_default_free(x) _C_TS_free(x)
 629 /* also _C_TS_calloc(x) */
 630 #else
 631 /* C defaults */
 632 # define uprv_default_malloc(x) malloc(x)
 633 # define uprv_default_realloc(x,y) realloc(x,y)
 634 # define uprv_default_free(x) free(x)
 635 #endif
 636
 637
 638 #endif