+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
/*
******************************************************************************
*
-* Copyright (C) 1997-2006, International Business Machines
+* Copyright (C) 1997-2016, International Business Machines
* Corporation and others. All Rights Reserved.
*
******************************************************************************
#include "unicode/utypes.h"
#include "unicode/putil.h"
+/**
+ * \def U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC
+ * Nearly all CPUs and compilers implement a right-shift of a signed integer
+ * as an Arithmetic Shift Right which copies the sign bit (the Most Significant Bit (MSB))
+ * into the vacated bits (sign extension).
+ * For example, (int32_t)0xfff5fff3>>4 becomes 0xffff5fff and -1>>1=-1.
+ *
+ * This can be useful for storing a signed value in the upper bits
+ * and another bit field in the lower bits.
+ * The signed value can be retrieved by simple right-shifting.
+ *
+ * This is consistent with the Java language.
+ *
+ * However, the C standard allows compilers to implement a right-shift of a signed integer
+ * as a Logical Shift Right which copies a 0 into the vacated bits.
+ * For example, (int32_t)0xfff5fff3>>4 becomes 0x0fff5fff and -1>>1=0x7fffffff.
+ *
+ * Code that depends on the natural behavior should be guarded with this macro,
+ * with an alternate path for unusual platforms.
+ * @internal
+ */
+#ifdef U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC
+ /* Use the predefined value. */
+#else
+ /*
+ * Nearly all CPUs & compilers implement a right-shift of a signed integer
+ * as an Arithmetic Shift Right (with sign extension).
+ */
+# define U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC 1
+#endif
+
+/** Define this to 1 if your platform supports IEEE 754 floating point,
+ to 0 if it does not. */
+#ifndef IEEE_754
+# define IEEE_754 1
+#endif
+
+/**
+ * uintptr_t is an optional part of the standard definitions in stdint.h.
+ * The opengroup.org documentation for stdint.h says
+ * "On XSI-conformant systems, the intptr_t and uintptr_t types are required;
+ * otherwise, they are optional."
+ * We assume that when uintptr_t is defined, UINTPTR_MAX is defined as well.
+ *
+ * Do not use ptrdiff_t since it is signed. size_t is unsigned.
+ */
+/* TODO: This check fails on some z environments. Filed a ticket #9357 for this. */
+#if !defined(__intptr_t_defined) && !defined(UINTPTR_MAX) && (U_PLATFORM != U_PF_OS390)
+typedef size_t uintptr_t;
+#endif
+
+/*===========================================================================*/
+/** @{ Information about POSIX support */
+/*===========================================================================*/
+
+#ifdef U_HAVE_NL_LANGINFO_CODESET
+ /* Use the predefined value. */
+#elif U_PLATFORM_USES_ONLY_WIN32_API || U_PLATFORM == U_PF_ANDROID || U_PLATFORM == U_PF_QNX
+# define U_HAVE_NL_LANGINFO_CODESET 0
+#else
+# define U_HAVE_NL_LANGINFO_CODESET 1
+#endif
+
+#ifdef U_NL_LANGINFO_CODESET
+ /* Use the predefined value. */
+#elif !U_HAVE_NL_LANGINFO_CODESET
+# define U_NL_LANGINFO_CODESET -1
+#elif U_PLATFORM == U_PF_OS400
+ /* not defined */
+#else
+# define U_NL_LANGINFO_CODESET CODESET
+#endif
+
+#if defined(U_TZSET) || defined(U_HAVE_TZSET)
+ /* Use the predefined value. */
+#elif U_PLATFORM_USES_ONLY_WIN32_API
+ // UWP doesn't support tzset or environment variables for tz
+#if U_PLATFORM_HAS_WINUWP_API == 0
+# define U_TZSET _tzset
+#endif
+#elif U_PLATFORM == U_PF_OS400
+ /* not defined */
+#else
+# define U_TZSET tzset
+#endif
+
+#if defined(U_TIMEZONE) || defined(U_HAVE_TIMEZONE)
+ /* Use the predefined value. */
+#elif U_PLATFORM == U_PF_ANDROID
+# define U_TIMEZONE timezone
+#elif defined(__UCLIBC__)
+ // uClibc does not have __timezone or _timezone.
+#elif defined(_NEWLIB_VERSION)
+# define U_TIMEZONE _timezone
+#elif defined(__GLIBC__)
+ // glibc
+# define U_TIMEZONE __timezone
+#elif U_PLATFORM_IS_LINUX_BASED
+ // not defined
+#elif U_PLATFORM_USES_ONLY_WIN32_API
+# define U_TIMEZONE _timezone
+#elif U_PLATFORM == U_PF_BSD && !defined(__NetBSD__)
+ /* not defined */
+#elif U_PLATFORM == U_PF_OS400
+ /* not defined */
+#elif U_PLATFORM == U_PF_IPHONE
+ /* not defined */
+#else
+# define U_TIMEZONE timezone
+#endif
+
+#if defined(U_TZNAME) || defined(U_HAVE_TZNAME)
+ /* Use the predefined value. */
+#elif U_PLATFORM_USES_ONLY_WIN32_API
+ /* not usable on all windows platforms */
+#if U_PLATFORM_HAS_WINUWP_API == 0
+# define U_TZNAME _tzname
+#endif
+#elif U_PLATFORM == U_PF_OS400
+ /* not defined */
+#else
+# define U_TZNAME tzname
+#endif
+
+#ifdef U_HAVE_MMAP
+ /* Use the predefined value. */
+#elif U_PLATFORM_USES_ONLY_WIN32_API
+# define U_HAVE_MMAP 0
+#else
+# define U_HAVE_MMAP 1
+#endif
+
+#ifdef U_HAVE_POPEN
+ /* Use the predefined value. */
+#elif U_PLATFORM_USES_ONLY_WIN32_API
+# define U_HAVE_POPEN 0
+#elif U_PLATFORM == U_PF_OS400
+# define U_HAVE_POPEN 0
+#else
+# define U_HAVE_POPEN 1
+#endif
+
+/**
+ * \def U_HAVE_DIRENT_H
+ * Defines whether dirent.h is available.
+ * @internal
+ */
+#ifdef U_HAVE_DIRENT_H
+ /* Use the predefined value. */
+#elif U_PLATFORM_USES_ONLY_WIN32_API
+# define U_HAVE_DIRENT_H 0
+#else
+# define U_HAVE_DIRENT_H 1
+#endif
+
+/** @} */
+
+/*===========================================================================*/
+/** @{ GCC built in functions for atomic memory operations */
+/*===========================================================================*/
+
+/**
+ * \def U_HAVE_GCC_ATOMICS
+ * @internal
+ */
+#ifdef U_HAVE_GCC_ATOMICS
+ /* Use the predefined value. */
+#elif U_PLATFORM == U_PF_MINGW
+ #define U_HAVE_GCC_ATOMICS 0
+#elif U_GCC_MAJOR_MINOR >= 404 || defined(__clang__)
+ /* TODO: Intel icc and IBM xlc on AIX also support gcc atomics. (Intel originated them.)
+ * Add them for these compilers.
+ * Note: Clang sets __GNUC__ defines for version 4.2, so misses the 4.4 test here.
+ */
+# define U_HAVE_GCC_ATOMICS 1
+#else
+# define U_HAVE_GCC_ATOMICS 0
+#endif
+
+/** @} */
+
+/**
+ * \def U_HAVE_STD_ATOMICS
+ * Defines whether to use the C++11 std::atomic functions.
+ * If false, ICU will fall back to compiler or platform specific alternatives.
+ * Note: support for these fall back options for atomics will be removed in a future version
+ * of ICU, and the use of C++ 11 atomics will be required.
+ * @internal
+ */
+#ifdef U_HAVE_STD_ATOMICS
+ /* Use the predefined value. */
+#else
+# define U_HAVE_STD_ATOMICS 1
+#endif
+
+/**
+ * \def U_HAVE_CLANG_ATOMICS
+ * Defines whether Clang c11 style built-in atomics are available.
+ * These are used in preference to gcc atomics when both are available.
+ */
+#ifdef U_HAVE_CLANG_ATOMICS
+ /* Use the predefined value. */
+#elif __has_builtin(__c11_atomic_load) && \
+ __has_builtin(__c11_atomic_store) && \
+ __has_builtin(__c11_atomic_fetch_add) && \
+ __has_builtin(__c11_atomic_fetch_sub)
+# define U_HAVE_CLANG_ATOMICS 1
+#else
+# define U_HAVE_CLANG_ATOMICS 0
+#endif
+
+
+/**
+ * \def U_HAVE_STD_MUTEX
+ * Defines whether to use the C++11 std::mutex functions.
+ * If false, ICU will fall back to compiler or platform specific alternatives.
+ * std::mutex is preferred, and used by default unless this setting is overridden.
+ * Note: support for other options for mutexes will be removed in a future version
+ * of ICU, and the use of std::mutex will be required.
+ * @internal
+ */
+#ifdef U_HAVE_STD_MUTEX
+ /* Use the predefined value. */
+#else
+# define U_HAVE_STD_MUTEX 1
+#endif
+
+/*===========================================================================*/
+/** @{ Programs used by ICU code */
+/*===========================================================================*/
+
+/**
+ * \def U_MAKE_IS_NMAKE
+ * Defines whether the "make" program is Windows nmake.
+ */
+#ifdef U_MAKE_IS_NMAKE
+ /* Use the predefined value. */
+#elif U_PLATFORM == U_PF_WINDOWS
+# define U_MAKE_IS_NMAKE 1
+#else
+# define U_MAKE_IS_NMAKE 0
+#endif
+
+/** @} */
+
/*==========================================================================*/
/* Platform utilities */
/*==========================================================================*/
/**
* Platform utilities isolates the platform dependencies of the
- * libarary. For each platform which this code is ported to, these
+ * library. For each platform which this code is ported to, these
* functions may have to be re-implemented.
*/
*/
U_INTERNAL double U_EXPORT2 uprv_round(double x);
+/**
+ * Adds the signed integers a and b, storing the result in res.
+ * Checks for signed integer overflow.
+ * Similar to the GCC/Clang extension __builtin_add_overflow
+ *
+ * @param a The first operand.
+ * @param b The second operand.
+ * @param res a + b
+ * @return true if overflow occurred; false if no overflow occurred.
+ * @internal
+ */
+U_INTERNAL UBool U_EXPORT2 uprv_add32_overflow(int32_t a, int32_t b, int32_t* res);
+
+/**
+ * Multiplies the signed integers a and b, storing the result in res.
+ * Checks for signed integer overflow.
+ * Similar to the GCC/Clang extension __builtin_mul_overflow
+ *
+ * @param a The first multiplicand.
+ * @param b The second multiplicand.
+ * @param res a * b
+ * @return true if overflow occurred; false if no overflow occurred.
+ * @internal
+ */
+U_INTERNAL UBool U_EXPORT2 uprv_mul32_overflow(int32_t a, int32_t b, int32_t* res);
+
#if 0
/**
* Returns the number of digits after the decimal point in a double number x.
/*U_INTERNAL int32_t U_EXPORT2 uprv_digitsAfterDecimal(double x);*/
#endif
+#if !U_CHARSET_IS_UTF8
+/**
+ * Please use ucnv_getDefaultName() instead.
+ * Return the default codepage for this platform and locale.
+ * This function can call setlocale() on Unix platforms. Please read the
+ * platform documentation on setlocale() before calling this function.
+ * @return the default codepage for this platform
+ * @internal
+ */
+U_INTERNAL const char* U_EXPORT2 uprv_getDefaultCodepage(void);
+#endif
+
+/**
+ * Please use uloc_getDefault() instead.
+ * Return the default locale ID string by querying the system, or
+ * zero if one cannot be found.
+ * This function can call setlocale() on Unix platforms. Please read the
+ * platform documentation on setlocale() before calling this function.
+ * @return the default locale ID string
+ * @internal
+ */
+U_INTERNAL const char* U_EXPORT2 uprv_getDefaultLocaleID(void);
+
/**
* Time zone utilities
*
* Wrappers for C runtime library functions relating to timezones.
- * The t_tzset() function (similar to tzset) uses the current setting
- * of the environment variable TZ to assign values to three global
- * variables: daylight, timezone, and tzname. These variables have the
+ * The t_tzset() function (similar to tzset) uses the current setting
+ * of the environment variable TZ to assign values to three global
+ * variables: daylight, timezone, and tzname. These variables have the
* following meanings, and are declared in <time.h>.
*
* daylight Nonzero if daylight-saving-time zone (DST) is specified
*/
U_INTERNAL const char* U_EXPORT2 uprv_tzname(int n);
+/**
+ * Reset the global tzname cache.
+ * @internal
+ */
+U_INTERNAL void uprv_tzname_clear_cache();
+
/**
* Get UTC (GMT) time measured in milliseconds since 0:00 on 1/1/1970.
- * @return the UTC time measured in milliseconds
+ * This function is affected by 'faketime' and should be the bottleneck for all user-visible ICU time functions.
+ * @return the UTC time measured in milliseconds
* @internal
*/
U_INTERNAL UDate U_EXPORT2 uprv_getUTCtime(void);
+/**
+ * Get UTC (GMT) time measured in milliseconds since 0:00 on 1/1/1970.
+ * This function is not affected by 'faketime', so it should only be used by low level test functions- not by anything that
+ * exposes time to the end user.
+ * @return the UTC time measured in milliseconds
+ * @internal
+ */
+U_INTERNAL UDate U_EXPORT2 uprv_getRawUTCtime(void);
+
/**
* Determine whether a pathname is absolute or not, as defined by the platform.
* @param path Pathname to test
*/
U_INTERNAL UBool U_EXPORT2 uprv_pathIsAbsolute(const char *path);
+/**
+ * Use U_MAX_PTR instead of this function.
+ * @param void pointer to test
+ * @return the largest possible pointer greater than the base
+ * @internal (ICU 3.8)
+ */
+U_INTERNAL void * U_EXPORT2 uprv_maximumPtr(void *base);
+
/**
* Maximum value of a (void*) - use to indicate the limit of an 'infinite' buffer.
* In fact, buffer sizes must not exceed 2GB so that the difference between
* - return the largest possible pointer greater than base
* - return a valid pointer according to the machine architecture (AS/400, 64-bit, etc.)
* - avoid wrapping around at high addresses
- * - make sure that the returned pointer is not farther from base than 0x7fffffff
+ * - make sure that the returned pointer is not farther from base than 0x7fffffff bytes
*
* @param base The beginning of a buffer to find the maximum offset from
* @internal
*/
#ifndef U_MAX_PTR
-# if defined(OS390) && !defined(_LP64)
+# if U_PLATFORM == U_PF_OS390 && !defined(_LP64)
/* We have 31-bit pointers. */
# define U_MAX_PTR(base) ((void *)0x7fffffff)
-# elif defined(OS400)
-/*
- * With the provided macro we should never be out of range of a given segment
- * (a traditional/typical segment that is). Our segments have 5 bytes for the
- * id and 3 bytes for the offset. The key is that the casting takes care of
- * only retrieving the offset portion minus x1000. Hence, the smallest offset
- * seen in a program is x001000 and when casted to an int would be 0.
- * That's why we can only add 0xffefff. Otherwise, we would exceed the segment.
- *
- * Currently, 16MB is the current addressing limitation on as/400. This macro
- * may eventually be changed to use 2GB addressability for the newer version of
- * as/400 machines.
- */
-# define U_MAX_PTR(base) ((void *)(((char *)base)-((int32_t)(base))+((int32_t)0xffefff)))
-# elif defined(__GNUC__) && __GNUC__ >= 4
-/*
- * Due to a compiler optimization bug, gcc 4 causes test failures when doing
- * this math arithmetic on pointers on some platforms. It seems like the
- * pointers are considered signed instead of unsigned. The uintptr_t type
- * isn't available on all platforms (i.e MSVC 6) and pointers aren't always
- * a scalar value (i.e. i5/OS in the lines above).
- */
+# elif U_PLATFORM == U_PF_OS400
+# define U_MAX_PTR(base) uprv_maximumPtr((void *)base)
+# elif 0
+ /*
+ * For platforms where pointers are scalar values (which is normal, but unlike i5/OS)
+ * but that do not define uintptr_t.
+ *
+ * However, this does not work on modern compilers:
+ * The C++ standard does not define pointer overflow, and allows compilers to
+ * assume that p+u>p for any pointer p and any integer u>0.
+ * Thus, modern compilers optimize away the ">" comparison.
+ * (See ICU tickets #7187 and #8096.)
+ */
+# define U_MAX_PTR(base) \
+ ((void *)(((char *)(base)+0x7fffffffu) > (char *)(base) \
+ ? ((char *)(base)+0x7fffffffu) \
+ : (char *)-1))
+# else
+ /* Default version. C++ standard compliant for scalar pointers. */
# define U_MAX_PTR(base) \
((void *)(((uintptr_t)(base)+0x7fffffffu) > (uintptr_t)(base) \
? ((uintptr_t)(base)+0x7fffffffu) \
: (uintptr_t)-1))
+# endif
+#endif
+
+
+#ifdef __cplusplus
+/**
+ * Pin a buffer capacity such that doing pointer arithmetic
+ * on the destination pointer and capacity cannot overflow.
+ *
+ * The pinned capacity must fulfill the following conditions (for positive capacities):
+ * - dest + capacity is a valid pointer according to the machine arcitecture (AS/400, 64-bit, etc.)
+ * - (dest + capacity) >= dest
+ * - The size (in bytes) of T[capacity] does not exceed 0x7fffffff
+ *
+ * @param dest the destination buffer pointer.
+ * @param capacity the requested buffer capacity, in units of type T.
+ * @return the pinned capacity.
+ * @internal
+ */
+template <typename T>
+inline int32_t pinCapacity(T *dest, int32_t capacity) {
+ if (capacity <= 0) { return capacity; }
+
+ uintptr_t destInt = (uintptr_t)dest;
+ uintptr_t maxInt;
+
+# if U_PLATFORM == U_PF_OS390 && !defined(_LP64)
+ // We have 31-bit pointers.
+ maxInt = 0x7fffffff;
+# elif U_PLATFORM == U_PF_OS400
+ maxInt = (uintptr_t)uprv_maximumPtr((void *)dest);
# else
-# define U_MAX_PTR(base) \
- ((char *)(((char *)(base)+0x7fffffffu) > (char *)(base) \
- ? ((char *)(base)+0x7fffffffu) \
- : (char *)-1))
+ maxInt = destInt + 0x7fffffffu;
+ if (maxInt < destInt) {
+ // Less than 2GB to the end of the address space.
+ // Pin to that to prevent address overflow.
+ maxInt = (uintptr_t)-1;
+ }
# endif
+
+ uintptr_t maxBytes = maxInt - destInt; // max. 2GB
+ int32_t maxCapacity = (int32_t)(maxBytes / sizeof(T));
+ return capacity <= maxCapacity ? capacity : maxCapacity;
+}
+#endif // __cplusplus
+
+/* Dynamic Library Functions */
+
+typedef void (UVoidFunction)(void);
+
+#if U_ENABLE_DYLOAD
+/**
+ * Load a library
+ * @internal (ICU 4.4)
+ */
+U_INTERNAL void * U_EXPORT2 uprv_dl_open(const char *libName, UErrorCode *status);
+
+/**
+ * Close a library
+ * @internal (ICU 4.4)
+ */
+U_INTERNAL void U_EXPORT2 uprv_dl_close( void *lib, UErrorCode *status);
+
+/**
+ * Extract a symbol from a library (function)
+ * @internal (ICU 4.8)
+ */
+U_INTERNAL UVoidFunction* U_EXPORT2 uprv_dlsym_func( void *lib, const char *symbolName, UErrorCode *status);
+
+/**
+ * Extract a symbol from a library (function)
+ * Not implemented, no clients.
+ * @internal
+ */
+/* U_INTERNAL void * U_EXPORT2 uprv_dlsym_data( void *lib, const char *symbolName, UErrorCode *status); */
+
#endif
+/**
+ * Define malloc and related functions
+ * @internal
+ */
+#if U_PLATFORM == U_PF_OS400
+# define uprv_default_malloc(x) _C_TS_malloc(x)
+# define uprv_default_realloc(x,y) _C_TS_realloc(x,y)
+# define uprv_default_free(x) _C_TS_free(x)
+/* also _C_TS_calloc(x) */
+#else
+/* C defaults */
+# define uprv_default_malloc(x) malloc(x)
+# define uprv_default_realloc(x,y) realloc(x,y)
+# define uprv_default_free(x) free(x)
+#endif
+
+
#endif
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