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comparison: intl/icu/source/common/putilimp.h

intl/icu/source/common/putilimp.h

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1 /*
2 ******************************************************************************
3 *
4 * Copyright (C) 1997-2013, International Business Machines
5 * Corporation and others. All Rights Reserved.
6 *
7 ******************************************************************************
8 *
9 * FILE NAME : putilimp.h
10 *
11 * Date Name Description
12 * 10/17/04 grhoten Move internal functions from putil.h to this file.
13 ******************************************************************************
14 */
15
16 #ifndef PUTILIMP_H
17 #define PUTILIMP_H
18
19 #include "unicode/utypes.h"
20 #include "unicode/putil.h"
21
22 /**
23 * \def U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC
24 * Nearly all CPUs and compilers implement a right-shift of a signed integer
25 * as an Arithmetic Shift Right which copies the sign bit (the Most Significant Bit (MSB))
26 * into the vacated bits (sign extension).
27 * For example, (int32_t)0xfff5fff3>>4 becomes 0xffff5fff and -1>>1=-1.
28 *
29 * This can be useful for storing a signed value in the upper bits
30 * and another bit field in the lower bits.
31 * The signed value can be retrieved by simple right-shifting.
32 *
33 * This is consistent with the Java language.
34 *
35 * However, the C standard allows compilers to implement a right-shift of a signed integer
36 * as a Logical Shift Right which copies a 0 into the vacated bits.
37 * For example, (int32_t)0xfff5fff3>>4 becomes 0x0fff5fff and -1>>1=0x7fffffff.
38 *
39 * Code that depends on the natural behavior should be guarded with this macro,
40 * with an alternate path for unusual platforms.
41 * @internal
42 */
43 #ifdef U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC
44 /* Use the predefined value. */
45 #else
46 /*
47 * Nearly all CPUs & compilers implement a right-shift of a signed integer
48 * as an Arithmetic Shift Right (with sign extension).
49 */
50 # define U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC 1
51 #endif
52
53 /** Define this to 1 if your platform supports IEEE 754 floating point,
54 to 0 if it does not. */
55 #ifndef IEEE_754
56 # define IEEE_754 1
57 #endif
58
59 /**
60 * uintptr_t is an optional part of the standard definitions in stdint.h.
61 * The opengroup.org documentation for stdint.h says
62 * "On XSI-conformant systems, the intptr_t and uintptr_t types are required;
63 * otherwise, they are optional."
64 * We assume that when uintptr_t is defined, UINTPTR_MAX is defined as well.
65 *
66 * Do not use ptrdiff_t since it is signed. size_t is unsigned.
67 */
68 /* TODO: This check fails on some z environments. Filed a ticket #9357 for this. */
69 #if !defined(__intptr_t_defined) && !defined(UINTPTR_MAX) && (U_PLATFORM != U_PF_OS390)
70 typedef size_t uintptr_t;
71 #endif
72
73 /**
74 * \def U_HAVE_MSVC_2003_OR_EARLIER
75 * Flag for workaround of MSVC 2003 optimization bugs
76 * @internal
77 */
78 #if !defined(U_HAVE_MSVC_2003_OR_EARLIER) && defined(_MSC_VER) && (_MSC_VER < 1400)
79 #define U_HAVE_MSVC_2003_OR_EARLIER
80 #endif
81
82 /*===========================================================================*/
83 /** @{ Information about POSIX support */
84 /*===========================================================================*/
85
86 #ifdef U_HAVE_NL_LANGINFO_CODESET
87 /* Use the predefined value. */
88 #elif U_PLATFORM_HAS_WIN32_API
89 # define U_HAVE_NL_LANGINFO_CODESET 0
90 #else
91 # define U_HAVE_NL_LANGINFO_CODESET 1
92 #endif
93
94 #ifdef U_NL_LANGINFO_CODESET
95 /* Use the predefined value. */
96 #elif !U_HAVE_NL_LANGINFO_CODESET
97 # define U_NL_LANGINFO_CODESET -1
98 #elif U_PLATFORM == U_PF_OS400
99 /* not defined */
100 #else
101 # define U_NL_LANGINFO_CODESET CODESET
102 #endif
103
104 #ifdef U_TZSET
105 /* Use the predefined value. */
106 #elif U_PLATFORM_USES_ONLY_WIN32_API
107 # define U_TZSET _tzset
108 #elif U_PLATFORM == U_PF_OS400
109 /* not defined */
110 #else
111 # define U_TZSET tzset
112 #endif
113
114 #if defined(U_TIMEZONE) || defined(U_HAVE_TIMEZONE)
115 /* Use the predefined value. */
116 #elif U_PLATFORM == U_PF_ANDROID
117 # define U_TIMEZONE timezone
118 #elif U_PLATFORM_IS_LINUX_BASED
119 # if !defined(__UCLIBC__)
120 /* __timezone is only available in glibc */
121 # define U_TIMEZONE __timezone
122 # endif
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 # define U_TZNAME _tzname
139 #elif U_PLATFORM == U_PF_OS400
140 /* not defined */
141 #else
142 # define U_TZNAME tzname
143 #endif
144
145 #ifdef U_HAVE_MMAP
146 /* Use the predefined value. */
147 #elif U_PLATFORM_HAS_WIN32_API
148 # define U_HAVE_MMAP 0
149 #else
150 # define U_HAVE_MMAP 1
151 #endif
152
153 #ifdef U_HAVE_POPEN
154 /* Use the predefined value. */
155 #elif U_PLATFORM_USES_ONLY_WIN32_API
156 # define U_HAVE_POPEN 0
157 #elif U_PLATFORM == U_PF_OS400
158 # define U_HAVE_POPEN 0
159 #else
160 # define U_HAVE_POPEN 1
161 #endif
162
163 /**
164 * \def U_HAVE_DIRENT_H
165 * Defines whether dirent.h is available.
166 * @internal
167 */
168 #ifdef U_HAVE_DIRENT_H
169 /* Use the predefined value. */
170 #elif U_PLATFORM_HAS_WIN32_API
171 # define U_HAVE_DIRENT_H 0
172 #else
173 # define U_HAVE_DIRENT_H 1
174 #endif
175
176 /** @} */
177
178 /*===========================================================================*/
179 /** @{ GCC built in functions for atomic memory operations */
180 /*===========================================================================*/
181
182 /**
183 * \def U_HAVE_GCC_ATOMICS
184 * @internal
185 */
186 #ifdef U_HAVE_GCC_ATOMICS
187 /* Use the predefined value. */
188 #elif U_PLATFORM == U_PF_MINGW
189 #define U_HAVE_GCC_ATOMICS 0
190 #elif U_GCC_MAJOR_MINOR >= 404 || defined(__clang__)
191 /* TODO: Intel icc and IBM xlc on AIX also support gcc atomics. (Intel originated them.)
192 * Add them for these compilers.
193 * Note: Clang sets __GNUC__ defines for version 4.2, so misses the 4.4 test here.
194 */
195 # define U_HAVE_GCC_ATOMICS 1
196 #else
197 # define U_HAVE_GCC_ATOMICS 0
198 #endif
199
200 /** @} */
201
202 /**
203 * \def U_HAVE_STD_ATOMICS
204 * Defines whether the standard C++11 <atomic> is available.
205 * ICU will use this when avialable,
206 * otherwise will fall back to compiler or platform specific alternatives.
207 * @internal
208 */
209 #ifdef U_HAVE_STD_ATOMICS
210 /* Use the predefined value. */
211 #elif !defined(__cplusplus) || __cplusplus<201103L
212 /* Not C++11, disable use of atomics */
213 # define U_HAVE_STD_ATOMICS 0
214 #elif __clang__ && __clang_major__==3 && __clang_minor__<=1
215 /* Clang 3.1, has atomic variable initializer bug. */
216 # define U_HAVE_STD_ATOMICS 0
217 #else
218 /* U_HAVE_ATOMIC is typically set by an autoconf test of #include <atomic> */
219 /* Can be set manually, or left undefined, on platforms without autoconf. */
220 # if defined(U_HAVE_ATOMIC) && U_HAVE_ATOMIC
221 # define U_HAVE_STD_ATOMICS 1
222 # else
223 # define U_HAVE_STD_ATOMICS 0
224 # endif
225 #endif
226
227
228 /*===========================================================================*/
229 /** @{ Code alignment */
230 /*===========================================================================*/
231
232 /**
233 * \def U_ALIGN_CODE
234 * This is used to align code fragments to a specific byte boundary.
235 * This is useful for getting consistent performance test results.
236 * @internal
237 */
238 #ifdef U_ALIGN_CODE
239 /* Use the predefined value. */
240 #elif defined(_MSC_VER) && defined(_M_IX86) && !defined(_MANAGED)
241 # define U_ALIGN_CODE(boundarySize) __asm align boundarySize
242 #else
243 # define U_ALIGN_CODE(boundarySize)
244 #endif
245
246 /** @} */
247
248 /*===========================================================================*/
249 /** @{ Programs used by ICU code */
250 /*===========================================================================*/
251
252 /**
253 * \def U_MAKE_IS_NMAKE
254 * Defines whether the "make" program is Windows nmake.
255 */
256 #ifdef U_MAKE_IS_NMAKE
257 /* Use the predefined value. */
258 #elif U_PLATFORM == U_PF_WINDOWS
259 # define U_MAKE_IS_NMAKE 1
260 #else
261 # define U_MAKE_IS_NMAKE 0
262 #endif
263
264 /** @} */
265
266 /*==========================================================================*/
267 /* Platform utilities */
268 /*==========================================================================*/
269
270 /**
271 * Platform utilities isolates the platform dependencies of the
272 * libarary. For each platform which this code is ported to, these
273 * functions may have to be re-implemented.
274 */
275
276 /**
277 * Floating point utility to determine if a double is Not a Number (NaN).
278 * @internal
279 */
280 U_INTERNAL UBool U_EXPORT2 uprv_isNaN(double d);
281 /**
282 * Floating point utility to determine if a double has an infinite value.
283 * @internal
284 */
285 U_INTERNAL UBool U_EXPORT2 uprv_isInfinite(double d);
286 /**
287 * Floating point utility to determine if a double has a positive infinite value.
288 * @internal
289 */
290 U_INTERNAL UBool U_EXPORT2 uprv_isPositiveInfinity(double d);
291 /**
292 * Floating point utility to determine if a double has a negative infinite value.
293 * @internal
294 */
295 U_INTERNAL UBool U_EXPORT2 uprv_isNegativeInfinity(double d);
296 /**
297 * Floating point utility that returns a Not a Number (NaN) value.
298 * @internal
299 */
300 U_INTERNAL double U_EXPORT2 uprv_getNaN(void);
301 /**
302 * Floating point utility that returns an infinite value.
303 * @internal
304 */
305 U_INTERNAL double U_EXPORT2 uprv_getInfinity(void);
306
307 /**
308 * Floating point utility to truncate a double.
309 * @internal
310 */
311 U_INTERNAL double U_EXPORT2 uprv_trunc(double d);
312 /**
313 * Floating point utility to calculate the floor of a double.
314 * @internal
315 */
316 U_INTERNAL double U_EXPORT2 uprv_floor(double d);
317 /**
318 * Floating point utility to calculate the ceiling of a double.
319 * @internal
320 */
321 U_INTERNAL double U_EXPORT2 uprv_ceil(double d);
322 /**
323 * Floating point utility to calculate the absolute value of a double.
324 * @internal
325 */
326 U_INTERNAL double U_EXPORT2 uprv_fabs(double d);
327 /**
328 * Floating point utility to calculate the fractional and integer parts of a double.
329 * @internal
330 */
331 U_INTERNAL double U_EXPORT2 uprv_modf(double d, double* pinteger);
332 /**
333 * Floating point utility to calculate the remainder of a double divided by another double.
334 * @internal
335 */
336 U_INTERNAL double U_EXPORT2 uprv_fmod(double d, double y);
337 /**
338 * Floating point utility to calculate d to the power of exponent (d^exponent).
339 * @internal
340 */
341 U_INTERNAL double U_EXPORT2 uprv_pow(double d, double exponent);
342 /**
343 * Floating point utility to calculate 10 to the power of exponent (10^exponent).
344 * @internal
345 */
346 U_INTERNAL double U_EXPORT2 uprv_pow10(int32_t exponent);
347 /**
348 * Floating point utility to calculate the maximum value of two doubles.
349 * @internal
350 */
351 U_INTERNAL double U_EXPORT2 uprv_fmax(double d, double y);
352 /**
353 * Floating point utility to calculate the minimum value of two doubles.
354 * @internal
355 */
356 U_INTERNAL double U_EXPORT2 uprv_fmin(double d, double y);
357 /**
358 * Private utility to calculate the maximum value of two integers.
359 * @internal
360 */
361 U_INTERNAL int32_t U_EXPORT2 uprv_max(int32_t d, int32_t y);
362 /**
363 * Private utility to calculate the minimum value of two integers.
364 * @internal
365 */
366 U_INTERNAL int32_t U_EXPORT2 uprv_min(int32_t d, int32_t y);
367
368 #if U_IS_BIG_ENDIAN
369 # define uprv_isNegative(number) (*((signed char *)&(number))<0)
370 #else
371 # define uprv_isNegative(number) (*((signed char *)&(number)+sizeof(number)-1)<0)
372 #endif
373
374 /**
375 * Return the largest positive number that can be represented by an integer
376 * type of arbitrary bit length.
377 * @internal
378 */
379 U_INTERNAL double U_EXPORT2 uprv_maxMantissa(void);
380
381 /**
382 * Floating point utility to calculate the logarithm of a double.
383 * @internal
384 */
385 U_INTERNAL double U_EXPORT2 uprv_log(double d);
386
387 /**
388 * Does common notion of rounding e.g. uprv_floor(x + 0.5);
389 * @param x the double number
390 * @return the rounded double
391 * @internal
392 */
393 U_INTERNAL double U_EXPORT2 uprv_round(double x);
394
395 #if 0
396 /**
397 * Returns the number of digits after the decimal point in a double number x.
398 *
399 * @param x the double number
400 * @return the number of digits after the decimal point in a double number x.
401 * @internal
402 */
403 /*U_INTERNAL int32_t U_EXPORT2 uprv_digitsAfterDecimal(double x);*/
404 #endif
405
406 #if !U_CHARSET_IS_UTF8
407 /**
408 * Please use ucnv_getDefaultName() instead.
409 * Return the default codepage for this platform and locale.
410 * This function can call setlocale() on Unix platforms. Please read the
411 * platform documentation on setlocale() before calling this function.
412 * @return the default codepage for this platform
413 * @internal
414 */
415 U_INTERNAL const char* U_EXPORT2 uprv_getDefaultCodepage(void);
416 #endif
417
418 /**
419 * Please use uloc_getDefault() instead.
420 * Return the default locale ID string by querying ths system, or
421 * zero if one cannot be found.
422 * This function can call setlocale() on Unix platforms. Please read the
423 * platform documentation on setlocale() before calling this function.
424 * @return the default locale ID string
425 * @internal
426 */
427 U_INTERNAL const char* U_EXPORT2 uprv_getDefaultLocaleID(void);
428
429 /**
430 * Time zone utilities
431 *
432 * Wrappers for C runtime library functions relating to timezones.
433 * The t_tzset() function (similar to tzset) uses the current setting
434 * of the environment variable TZ to assign values to three global
435 * variables: daylight, timezone, and tzname. These variables have the
436 * following meanings, and are declared in &lt;time.h&gt;.
437 *
438 * daylight Nonzero if daylight-saving-time zone (DST) is specified
439 * in TZ; otherwise, 0. Default value is 1.
440 * timezone Difference in seconds between coordinated universal
441 * time and local time. E.g., -28,800 for PST (GMT-8hrs)
442 * tzname(0) Three-letter time-zone name derived from TZ environment
443 * variable. E.g., "PST".
444 * tzname(1) Three-letter DST zone name derived from TZ environment
445 * variable. E.g., "PDT". If DST zone is omitted from TZ,
446 * tzname(1) is an empty string.
447 *
448 * Notes: For example, to set the TZ environment variable to correspond
449 * to the current time zone in Germany, you can use one of the
450 * following statements:
451 *
452 * set TZ=GST1GDT
453 * set TZ=GST+1GDT
454 *
455 * If the TZ value is not set, t_tzset() attempts to use the time zone
456 * information specified by the operating system. Under Windows NT
457 * and Windows 95, this information is specified in the Control Panel's
458 * Date/Time application.
459 * @internal
460 */
461 U_INTERNAL void U_EXPORT2 uprv_tzset(void);
462
463 /**
464 * Difference in seconds between coordinated universal
465 * time and local time. E.g., -28,800 for PST (GMT-8hrs)
466 * @return the difference in seconds between coordinated universal time and local time.
467 * @internal
468 */
469 U_INTERNAL int32_t U_EXPORT2 uprv_timezone(void);
470
471 /**
472 * tzname(0) Three-letter time-zone name derived from TZ environment
473 * variable. E.g., "PST".
474 * tzname(1) Three-letter DST zone name derived from TZ environment
475 * variable. E.g., "PDT". If DST zone is omitted from TZ,
476 * tzname(1) is an empty string.
477 * @internal
478 */
479 U_INTERNAL const char* U_EXPORT2 uprv_tzname(int n);
480
481 /**
482 * Get UTC (GMT) time measured in milliseconds since 0:00 on 1/1/1970.
483 * This function is affected by 'faketime' and should be the bottleneck for all user-visible ICU time functions.
484 * @return the UTC time measured in milliseconds
485 * @internal
486 */
487 U_INTERNAL UDate U_EXPORT2 uprv_getUTCtime(void);
488
489 /**
490 * Get UTC (GMT) time measured in milliseconds since 0:00 on 1/1/1970.
491 * This function is not affected by 'faketime', so it should only be used by low level test functions- not by anything that
492 * exposes time to the end user.
493 * @return the UTC time measured in milliseconds
494 * @internal
495 */
496 U_INTERNAL UDate U_EXPORT2 uprv_getRawUTCtime(void);
497
498 /**
499 * Determine whether a pathname is absolute or not, as defined by the platform.
500 * @param path Pathname to test
501 * @return TRUE if the path is absolute
502 * @internal (ICU 3.0)
503 */
504 U_INTERNAL UBool U_EXPORT2 uprv_pathIsAbsolute(const char *path);
505
506 /**
507 * Use U_MAX_PTR instead of this function.
508 * @param void pointer to test
509 * @return the largest possible pointer greater than the base
510 * @internal (ICU 3.8)
511 */
512 U_INTERNAL void * U_EXPORT2 uprv_maximumPtr(void *base);
513
514 /**
515 * Maximum value of a (void*) - use to indicate the limit of an 'infinite' buffer.
516 * In fact, buffer sizes must not exceed 2GB so that the difference between
517 * the buffer limit and the buffer start can be expressed in an int32_t.
518 *
519 * The definition of U_MAX_PTR must fulfill the following conditions:
520 * - return the largest possible pointer greater than base
521 * - return a valid pointer according to the machine architecture (AS/400, 64-bit, etc.)
522 * - avoid wrapping around at high addresses
523 * - make sure that the returned pointer is not farther from base than 0x7fffffff bytes
524 *
525 * @param base The beginning of a buffer to find the maximum offset from
526 * @internal
527 */
528 #ifndef U_MAX_PTR
529 # if U_PLATFORM == U_PF_OS390 && !defined(_LP64)
530 /* We have 31-bit pointers. */
531 # define U_MAX_PTR(base) ((void *)0x7fffffff)
532 # elif U_PLATFORM == U_PF_OS400
533 # define U_MAX_PTR(base) uprv_maximumPtr((void *)base)
534 # elif 0
535 /*
536 * For platforms where pointers are scalar values (which is normal, but unlike i5/OS)
537 * but that do not define uintptr_t.
538 *
539 * However, this does not work on modern compilers:
540 * The C++ standard does not define pointer overflow, and allows compilers to
541 * assume that p+u>p for any pointer p and any integer u>0.
542 * Thus, modern compilers optimize away the ">" comparison.
543 * (See ICU tickets #7187 and #8096.)
544 */
545 # define U_MAX_PTR(base) \
546 ((void *)(((char *)(base)+0x7fffffffu) > (char *)(base) \
547 ? ((char *)(base)+0x7fffffffu) \
548 : (char *)-1))
549 # else
550 /* Default version. C++ standard compliant for scalar pointers. */
551 # define U_MAX_PTR(base) \
552 ((void *)(((uintptr_t)(base)+0x7fffffffu) > (uintptr_t)(base) \
553 ? ((uintptr_t)(base)+0x7fffffffu) \
554 : (uintptr_t)-1))
555 # endif
556 #endif
557
558 /* Dynamic Library Functions */
559
560 typedef void (UVoidFunction)(void);
561
562 #if U_ENABLE_DYLOAD
563 /**
564 * Load a library
565 * @internal (ICU 4.4)
566 */
567 U_INTERNAL void * U_EXPORT2 uprv_dl_open(const char *libName, UErrorCode *status);
568
569 /**
570 * Close a library
571 * @internal (ICU 4.4)
572 */
573 U_INTERNAL void U_EXPORT2 uprv_dl_close( void *lib, UErrorCode *status);
574
575 /**
576 * Extract a symbol from a library (function)
577 * @internal (ICU 4.8)
578 */
579 U_INTERNAL UVoidFunction* U_EXPORT2 uprv_dlsym_func( void *lib, const char *symbolName, UErrorCode *status);
580
581 /**
582 * Extract a symbol from a library (function)
583 * Not implemented, no clients.
584 * @internal
585 */
586 /* U_INTERNAL void * U_EXPORT2 uprv_dlsym_data( void *lib, const char *symbolName, UErrorCode *status); */
587
588 #endif
589
590 /**
591 * Define malloc and related functions
592 * @internal
593 */
594 #if U_PLATFORM == U_PF_OS400
595 # define uprv_default_malloc(x) _C_TS_malloc(x)
596 # define uprv_default_realloc(x,y) _C_TS_realloc(x,y)
597 # define uprv_default_free(x) _C_TS_free(x)
598 /* also _C_TS_calloc(x) */
599 #else
600 /* C defaults */
601 # define uprv_default_malloc(x) malloc(x)
602 # define uprv_default_realloc(x,y) realloc(x,y)
603 # define uprv_default_free(x) free(x)
604 #endif
605
606
607 #endif

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