/src/icu/source/common/putilimp.h
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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 | | #if defined(U_TZSET) || defined(U_HAVE_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 | 0 | # 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 | 0 | # 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 | | #if defined(U_TZNAME) || defined(U_HAVE_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 | 0 | # 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 | | /** @{ Programs used by ICU code */ |
183 | | /*===========================================================================*/ |
184 | | |
185 | | /** |
186 | | * \def U_MAKE_IS_NMAKE |
187 | | * Defines whether the "make" program is Windows nmake. |
188 | | */ |
189 | | #ifdef U_MAKE_IS_NMAKE |
190 | | /* Use the predefined value. */ |
191 | | #elif U_PLATFORM == U_PF_WINDOWS |
192 | | # define U_MAKE_IS_NMAKE 1 |
193 | | #else |
194 | | # define U_MAKE_IS_NMAKE 0 |
195 | | #endif |
196 | | |
197 | | /** @} */ |
198 | | |
199 | | /*==========================================================================*/ |
200 | | /* Platform utilities */ |
201 | | /*==========================================================================*/ |
202 | | |
203 | | /** |
204 | | * Platform utilities isolates the platform dependencies of the |
205 | | * library. For each platform which this code is ported to, these |
206 | | * functions may have to be re-implemented. |
207 | | */ |
208 | | |
209 | | /** |
210 | | * Floating point utility to determine if a double is Not a Number (NaN). |
211 | | * @internal |
212 | | */ |
213 | | U_CAPI UBool U_EXPORT2 uprv_isNaN(double d); |
214 | | /** |
215 | | * Floating point utility to determine if a double has an infinite value. |
216 | | * @internal |
217 | | */ |
218 | | U_CAPI UBool U_EXPORT2 uprv_isInfinite(double d); |
219 | | /** |
220 | | * Floating point utility to determine if a double has a positive infinite value. |
221 | | * @internal |
222 | | */ |
223 | | U_CAPI UBool U_EXPORT2 uprv_isPositiveInfinity(double d); |
224 | | /** |
225 | | * Floating point utility to determine if a double has a negative infinite value. |
226 | | * @internal |
227 | | */ |
228 | | U_CAPI UBool U_EXPORT2 uprv_isNegativeInfinity(double d); |
229 | | /** |
230 | | * Floating point utility that returns a Not a Number (NaN) value. |
231 | | * @internal |
232 | | */ |
233 | | U_CAPI double U_EXPORT2 uprv_getNaN(void); |
234 | | /** |
235 | | * Floating point utility that returns an infinite value. |
236 | | * @internal |
237 | | */ |
238 | | U_CAPI double U_EXPORT2 uprv_getInfinity(void); |
239 | | |
240 | | /** |
241 | | * Floating point utility to truncate a double. |
242 | | * @internal |
243 | | */ |
244 | | U_CAPI double U_EXPORT2 uprv_trunc(double d); |
245 | | /** |
246 | | * Floating point utility to calculate the floor of a double. |
247 | | * @internal |
248 | | */ |
249 | | U_CAPI double U_EXPORT2 uprv_floor(double d); |
250 | | /** |
251 | | * Floating point utility to calculate the ceiling of a double. |
252 | | * @internal |
253 | | */ |
254 | | U_CAPI double U_EXPORT2 uprv_ceil(double d); |
255 | | /** |
256 | | * Floating point utility to calculate the absolute value of a double. |
257 | | * @internal |
258 | | */ |
259 | | U_CAPI double U_EXPORT2 uprv_fabs(double d); |
260 | | /** |
261 | | * Floating point utility to calculate the fractional and integer parts of a double. |
262 | | * @internal |
263 | | */ |
264 | | U_CAPI double U_EXPORT2 uprv_modf(double d, double* pinteger); |
265 | | /** |
266 | | * Floating point utility to calculate the remainder of a double divided by another double. |
267 | | * @internal |
268 | | */ |
269 | | U_CAPI double U_EXPORT2 uprv_fmod(double d, double y); |
270 | | /** |
271 | | * Floating point utility to calculate d to the power of exponent (d^exponent). |
272 | | * @internal |
273 | | */ |
274 | | U_CAPI double U_EXPORT2 uprv_pow(double d, double exponent); |
275 | | /** |
276 | | * Floating point utility to calculate 10 to the power of exponent (10^exponent). |
277 | | * @internal |
278 | | */ |
279 | | U_CAPI double U_EXPORT2 uprv_pow10(int32_t exponent); |
280 | | /** |
281 | | * Floating point utility to calculate the maximum value of two doubles. |
282 | | * @internal |
283 | | */ |
284 | | U_CAPI double U_EXPORT2 uprv_fmax(double d, double y); |
285 | | /** |
286 | | * Floating point utility to calculate the minimum value of two doubles. |
287 | | * @internal |
288 | | */ |
289 | | U_CAPI double U_EXPORT2 uprv_fmin(double d, double y); |
290 | | /** |
291 | | * Private utility to calculate the maximum value of two integers. |
292 | | * @internal |
293 | | */ |
294 | | U_CAPI int32_t U_EXPORT2 uprv_max(int32_t d, int32_t y); |
295 | | /** |
296 | | * Private utility to calculate the minimum value of two integers. |
297 | | * @internal |
298 | | */ |
299 | | U_CAPI int32_t U_EXPORT2 uprv_min(int32_t d, int32_t y); |
300 | | |
301 | | #if U_IS_BIG_ENDIAN |
302 | | # define uprv_isNegative(number) (*((signed char *)&(number))<0) |
303 | | #else |
304 | | # define uprv_isNegative(number) (*((signed char *)&(number)+sizeof(number)-1)<0) |
305 | | #endif |
306 | | |
307 | | /** |
308 | | * Return the largest positive number that can be represented by an integer |
309 | | * type of arbitrary bit length. |
310 | | * @internal |
311 | | */ |
312 | | U_CAPI double U_EXPORT2 uprv_maxMantissa(void); |
313 | | |
314 | | /** |
315 | | * Floating point utility to calculate the logarithm of a double. |
316 | | * @internal |
317 | | */ |
318 | | U_CAPI double U_EXPORT2 uprv_log(double d); |
319 | | |
320 | | /** |
321 | | * Does common notion of rounding e.g. uprv_floor(x + 0.5); |
322 | | * @param x the double number |
323 | | * @return the rounded double |
324 | | * @internal |
325 | | */ |
326 | | U_CAPI double U_EXPORT2 uprv_round(double x); |
327 | | |
328 | | /** |
329 | | * Adds the signed integers a and b, storing the result in res. |
330 | | * Checks for signed integer overflow. |
331 | | * Similar to the GCC/Clang extension __builtin_add_overflow |
332 | | * |
333 | | * @param a The first operand. |
334 | | * @param b The second operand. |
335 | | * @param res a + b |
336 | | * @return true if overflow occurred; false if no overflow occurred. |
337 | | * @internal |
338 | | */ |
339 | | U_CAPI UBool U_EXPORT2 uprv_add32_overflow(int32_t a, int32_t b, int32_t* res); |
340 | | |
341 | | /** |
342 | | * Multiplies the signed integers a and b, storing the result in res. |
343 | | * Checks for signed integer overflow. |
344 | | * Similar to the GCC/Clang extension __builtin_mul_overflow |
345 | | * |
346 | | * @param a The first multiplicand. |
347 | | * @param b The second multiplicand. |
348 | | * @param res a * b |
349 | | * @return true if overflow occurred; false if no overflow occurred. |
350 | | * @internal |
351 | | */ |
352 | | U_CAPI UBool U_EXPORT2 uprv_mul32_overflow(int32_t a, int32_t b, int32_t* res); |
353 | | |
354 | | #if 0 |
355 | | /** |
356 | | * Returns the number of digits after the decimal point in a double number x. |
357 | | * |
358 | | * @param x the double number |
359 | | * @return the number of digits after the decimal point in a double number x. |
360 | | * @internal |
361 | | */ |
362 | | /*U_CAPI int32_t U_EXPORT2 uprv_digitsAfterDecimal(double x);*/ |
363 | | #endif |
364 | | |
365 | | #if !U_CHARSET_IS_UTF8 |
366 | | /** |
367 | | * Please use ucnv_getDefaultName() instead. |
368 | | * Return the default codepage for this platform and locale. |
369 | | * This function can call setlocale() on Unix platforms. Please read the |
370 | | * platform documentation on setlocale() before calling this function. |
371 | | * @return the default codepage for this platform |
372 | | * @internal |
373 | | */ |
374 | | U_CAPI const char* U_EXPORT2 uprv_getDefaultCodepage(void); |
375 | | #endif |
376 | | |
377 | | /** |
378 | | * Please use uloc_getDefault() instead. |
379 | | * Return the default locale ID string by querying the system, or |
380 | | * zero if one cannot be found. |
381 | | * This function can call setlocale() on Unix platforms. Please read the |
382 | | * platform documentation on setlocale() before calling this function. |
383 | | * @return the default locale ID string |
384 | | * @internal |
385 | | */ |
386 | | U_CAPI const char* U_EXPORT2 uprv_getDefaultLocaleID(void); |
387 | | |
388 | | /** |
389 | | * Time zone utilities |
390 | | * |
391 | | * Wrappers for C runtime library functions relating to timezones. |
392 | | * The t_tzset() function (similar to tzset) uses the current setting |
393 | | * of the environment variable TZ to assign values to three global |
394 | | * variables: daylight, timezone, and tzname. These variables have the |
395 | | * following meanings, and are declared in <time.h>. |
396 | | * |
397 | | * daylight Nonzero if daylight-saving-time zone (DST) is specified |
398 | | * in TZ; otherwise, 0. Default value is 1. |
399 | | * timezone Difference in seconds between coordinated universal |
400 | | * time and local time. E.g., -28,800 for PST (GMT-8hrs) |
401 | | * tzname(0) Three-letter time-zone name derived from TZ environment |
402 | | * variable. E.g., "PST". |
403 | | * tzname(1) Three-letter DST zone name derived from TZ environment |
404 | | * variable. E.g., "PDT". If DST zone is omitted from TZ, |
405 | | * tzname(1) is an empty string. |
406 | | * |
407 | | * Notes: For example, to set the TZ environment variable to correspond |
408 | | * to the current time zone in Germany, you can use one of the |
409 | | * following statements: |
410 | | * |
411 | | * set TZ=GST1GDT |
412 | | * set TZ=GST+1GDT |
413 | | * |
414 | | * If the TZ value is not set, t_tzset() attempts to use the time zone |
415 | | * information specified by the operating system. Under Windows NT |
416 | | * and Windows 95, this information is specified in the Control Panel's |
417 | | * Date/Time application. |
418 | | * @internal |
419 | | */ |
420 | | U_CAPI void U_EXPORT2 uprv_tzset(void); |
421 | | |
422 | | /** |
423 | | * Difference in seconds between coordinated universal |
424 | | * time and local time. E.g., -28,800 for PST (GMT-8hrs) |
425 | | * @return the difference in seconds between coordinated universal time and local time. |
426 | | * @internal |
427 | | */ |
428 | | U_CAPI int32_t U_EXPORT2 uprv_timezone(void); |
429 | | |
430 | | /** |
431 | | * tzname(0) Three-letter time-zone name derived from TZ environment |
432 | | * variable. E.g., "PST". |
433 | | * tzname(1) Three-letter DST zone name derived from TZ environment |
434 | | * variable. E.g., "PDT". If DST zone is omitted from TZ, |
435 | | * tzname(1) is an empty string. |
436 | | * @internal |
437 | | */ |
438 | | U_CAPI const char* U_EXPORT2 uprv_tzname(int n); |
439 | | |
440 | | /** |
441 | | * Reset the global tzname cache. |
442 | | * @internal |
443 | | */ |
444 | | U_CAPI void uprv_tzname_clear_cache(void); |
445 | | |
446 | | /** |
447 | | * Get UTC (GMT) time measured in milliseconds since 0:00 on 1/1/1970. |
448 | | * This function is affected by 'faketime' and should be the bottleneck for all user-visible ICU time functions. |
449 | | * @return the UTC time measured in milliseconds |
450 | | * @internal |
451 | | */ |
452 | | U_CAPI UDate U_EXPORT2 uprv_getUTCtime(void); |
453 | | |
454 | | /** |
455 | | * Get UTC (GMT) time measured in milliseconds since 0:00 on 1/1/1970. |
456 | | * This function is not affected by 'faketime', so it should only be used by low level test functions- not by anything that |
457 | | * exposes time to the end user. |
458 | | * @return the UTC time measured in milliseconds |
459 | | * @internal |
460 | | */ |
461 | | U_CAPI UDate U_EXPORT2 uprv_getRawUTCtime(void); |
462 | | |
463 | | /** |
464 | | * Determine whether a pathname is absolute or not, as defined by the platform. |
465 | | * @param path Pathname to test |
466 | | * @return true if the path is absolute |
467 | | * @internal (ICU 3.0) |
468 | | */ |
469 | | U_CAPI UBool U_EXPORT2 uprv_pathIsAbsolute(const char *path); |
470 | | |
471 | | /** |
472 | | * Use U_MAX_PTR instead of this function. |
473 | | * @param void pointer to test |
474 | | * @return the largest possible pointer greater than the base |
475 | | * @internal (ICU 3.8) |
476 | | */ |
477 | | U_CAPI void * U_EXPORT2 uprv_maximumPtr(void *base); |
478 | | |
479 | | /** |
480 | | * Maximum value of a (void*) - use to indicate the limit of an 'infinite' buffer. |
481 | | * In fact, buffer sizes must not exceed 2GB so that the difference between |
482 | | * the buffer limit and the buffer start can be expressed in an int32_t. |
483 | | * |
484 | | * The definition of U_MAX_PTR must fulfill the following conditions: |
485 | | * - return the largest possible pointer greater than base |
486 | | * - return a valid pointer according to the machine architecture (AS/400, 64-bit, etc.) |
487 | | * - avoid wrapping around at high addresses |
488 | | * - make sure that the returned pointer is not farther from base than 0x7fffffff bytes |
489 | | * |
490 | | * @param base The beginning of a buffer to find the maximum offset from |
491 | | * @internal |
492 | | */ |
493 | | #ifndef U_MAX_PTR |
494 | | # if U_PLATFORM == U_PF_OS390 && !defined(_LP64) |
495 | | /* We have 31-bit pointers. */ |
496 | | # define U_MAX_PTR(base) ((void *)0x7fffffff) |
497 | | # elif U_PLATFORM == U_PF_OS400 |
498 | | # define U_MAX_PTR(base) uprv_maximumPtr((void *)base) |
499 | | # elif 0 |
500 | | /* |
501 | | * For platforms where pointers are scalar values (which is normal, but unlike i5/OS) |
502 | | * but that do not define uintptr_t. |
503 | | * |
504 | | * However, this does not work on modern compilers: |
505 | | * The C++ standard does not define pointer overflow, and allows compilers to |
506 | | * assume that p+u>p for any pointer p and any integer u>0. |
507 | | * Thus, modern compilers optimize away the ">" comparison. |
508 | | * (See ICU tickets #7187 and #8096.) |
509 | | */ |
510 | | # define U_MAX_PTR(base) \ |
511 | | ((void *)(((char *)(base)+0x7fffffffu) > (char *)(base) \ |
512 | | ? ((char *)(base)+0x7fffffffu) \ |
513 | | : (char *)-1)) |
514 | | # else |
515 | | /* Default version. C++ standard compliant for scalar pointers. */ |
516 | | # define U_MAX_PTR(base) \ |
517 | 0 | ((void *)(((uintptr_t)(base)+0x7fffffffu) > (uintptr_t)(base) \ |
518 | 0 | ? ((uintptr_t)(base)+0x7fffffffu) \ |
519 | 0 | : (uintptr_t)-1)) |
520 | | # endif |
521 | | #endif |
522 | | |
523 | | |
524 | | #ifdef __cplusplus |
525 | | /** |
526 | | * Pin a buffer capacity such that doing pointer arithmetic |
527 | | * on the destination pointer and capacity cannot overflow. |
528 | | * |
529 | | * The pinned capacity must fulfill the following conditions (for positive capacities): |
530 | | * - dest + capacity is a valid pointer according to the machine architecture (AS/400, 64-bit, etc.) |
531 | | * - (dest + capacity) >= dest |
532 | | * - The size (in bytes) of T[capacity] does not exceed 0x7fffffff |
533 | | * |
534 | | * @param dest the destination buffer pointer. |
535 | | * @param capacity the requested buffer capacity, in units of type T. |
536 | | * @return the pinned capacity. |
537 | | * @internal |
538 | | */ |
539 | | template <typename T> |
540 | 0 | inline int32_t pinCapacity(T *dest, int32_t capacity) { |
541 | 0 | if (capacity <= 0) { return capacity; } |
542 | | |
543 | 0 | uintptr_t destInt = (uintptr_t)dest; |
544 | 0 | uintptr_t maxInt; |
545 | |
|
546 | | # if U_PLATFORM == U_PF_OS390 && !defined(_LP64) |
547 | | // We have 31-bit pointers. |
548 | | maxInt = 0x7fffffff; |
549 | | # elif U_PLATFORM == U_PF_OS400 |
550 | | maxInt = (uintptr_t)uprv_maximumPtr((void *)dest); |
551 | | # else |
552 | 0 | maxInt = destInt + 0x7fffffffu; |
553 | 0 | if (maxInt < destInt) { |
554 | | // Less than 2GB to the end of the address space. |
555 | | // Pin to that to prevent address overflow. |
556 | 0 | maxInt = (uintptr_t)-1; |
557 | 0 | } |
558 | 0 | # endif |
559 | |
|
560 | 0 | uintptr_t maxBytes = maxInt - destInt; // max. 2GB |
561 | 0 | int32_t maxCapacity = (int32_t)(maxBytes / sizeof(T)); |
562 | 0 | return capacity <= maxCapacity ? capacity : maxCapacity; |
563 | 0 | } Unexecuted instantiation: int pinCapacity<char>(char*, int) Unexecuted instantiation: int pinCapacity<char16_t>(char16_t*, int) |
564 | | #endif // __cplusplus |
565 | | |
566 | | /* Dynamic Library Functions */ |
567 | | |
568 | | typedef void (UVoidFunction)(void); |
569 | | |
570 | | #if U_ENABLE_DYLOAD |
571 | | /** |
572 | | * Load a library |
573 | | * @internal (ICU 4.4) |
574 | | */ |
575 | | U_CAPI void * U_EXPORT2 uprv_dl_open(const char *libName, UErrorCode *status); |
576 | | |
577 | | /** |
578 | | * Close a library |
579 | | * @internal (ICU 4.4) |
580 | | */ |
581 | | U_CAPI void U_EXPORT2 uprv_dl_close( void *lib, UErrorCode *status); |
582 | | |
583 | | /** |
584 | | * Extract a symbol from a library (function) |
585 | | * @internal (ICU 4.8) |
586 | | */ |
587 | | U_CAPI UVoidFunction* U_EXPORT2 uprv_dlsym_func( void *lib, const char *symbolName, UErrorCode *status); |
588 | | |
589 | | /** |
590 | | * Extract a symbol from a library (function) |
591 | | * Not implemented, no clients. |
592 | | * @internal |
593 | | */ |
594 | | /* U_CAPI void * U_EXPORT2 uprv_dlsym_data( void *lib, const char *symbolName, UErrorCode *status); */ |
595 | | |
596 | | #endif |
597 | | |
598 | | /** |
599 | | * Define malloc and related functions |
600 | | * @internal |
601 | | */ |
602 | | #if U_PLATFORM == U_PF_OS400 |
603 | | # define uprv_default_malloc(x) _C_TS_malloc(x) |
604 | | # define uprv_default_realloc(x,y) _C_TS_realloc(x,y) |
605 | | # define uprv_default_free(x) _C_TS_free(x) |
606 | | /* also _C_TS_calloc(x) */ |
607 | | #else |
608 | | /* C defaults */ |
609 | 4 | # define uprv_default_malloc(x) malloc(x) |
610 | 0 | # define uprv_default_realloc(x,y) realloc(x,y) |
611 | 0 | # define uprv_default_free(x) free(x) |
612 | | #endif |
613 | | |
614 | | |
615 | | #endif |