| /* |
| ****************************************************************************** |
| * |
| * Copyright (C) 1997-2006, International Business Machines |
| * Corporation and others. All Rights Reserved. |
| * |
| ****************************************************************************** |
| * |
| * FILE NAME : putilimp.h |
| * |
| * Date Name Description |
| * 10/17/04 grhoten Move internal functions from putil.h to this file. |
| ****************************************************************************** |
| */ |
| |
| #ifndef PUTILIMP_H |
| #define PUTILIMP_H |
| |
| #include "unicode/utypes.h" |
| #include "unicode/putil.h" |
| |
| /*==========================================================================*/ |
| /* Platform utilities */ |
| /*==========================================================================*/ |
| |
| /** |
| * Platform utilities isolates the platform dependencies of the |
| * libarary. For each platform which this code is ported to, these |
| * functions may have to be re-implemented. |
| */ |
| |
| /** |
| * Floating point utility to determine if a double is Not a Number (NaN). |
| * @internal |
| */ |
| U_INTERNAL UBool U_EXPORT2 uprv_isNaN(double d); |
| /** |
| * Floating point utility to determine if a double has an infinite value. |
| * @internal |
| */ |
| U_INTERNAL UBool U_EXPORT2 uprv_isInfinite(double d); |
| /** |
| * Floating point utility to determine if a double has a positive infinite value. |
| * @internal |
| */ |
| U_INTERNAL UBool U_EXPORT2 uprv_isPositiveInfinity(double d); |
| /** |
| * Floating point utility to determine if a double has a negative infinite value. |
| * @internal |
| */ |
| U_INTERNAL UBool U_EXPORT2 uprv_isNegativeInfinity(double d); |
| /** |
| * Floating point utility that returns a Not a Number (NaN) value. |
| * @internal |
| */ |
| U_INTERNAL double U_EXPORT2 uprv_getNaN(void); |
| /** |
| * Floating point utility that returns an infinite value. |
| * @internal |
| */ |
| U_INTERNAL double U_EXPORT2 uprv_getInfinity(void); |
| |
| /** |
| * Floating point utility to truncate a double. |
| * @internal |
| */ |
| U_INTERNAL double U_EXPORT2 uprv_trunc(double d); |
| /** |
| * Floating point utility to calculate the floor of a double. |
| * @internal |
| */ |
| U_INTERNAL double U_EXPORT2 uprv_floor(double d); |
| /** |
| * Floating point utility to calculate the ceiling of a double. |
| * @internal |
| */ |
| U_INTERNAL double U_EXPORT2 uprv_ceil(double d); |
| /** |
| * Floating point utility to calculate the absolute value of a double. |
| * @internal |
| */ |
| U_INTERNAL double U_EXPORT2 uprv_fabs(double d); |
| /** |
| * Floating point utility to calculate the fractional and integer parts of a double. |
| * @internal |
| */ |
| U_INTERNAL double U_EXPORT2 uprv_modf(double d, double* pinteger); |
| /** |
| * Floating point utility to calculate the remainder of a double divided by another double. |
| * @internal |
| */ |
| U_INTERNAL double U_EXPORT2 uprv_fmod(double d, double y); |
| /** |
| * Floating point utility to calculate d to the power of exponent (d^exponent). |
| * @internal |
| */ |
| U_INTERNAL double U_EXPORT2 uprv_pow(double d, double exponent); |
| /** |
| * Floating point utility to calculate 10 to the power of exponent (10^exponent). |
| * @internal |
| */ |
| U_INTERNAL double U_EXPORT2 uprv_pow10(int32_t exponent); |
| /** |
| * Floating point utility to calculate the maximum value of two doubles. |
| * @internal |
| */ |
| U_INTERNAL double U_EXPORT2 uprv_fmax(double d, double y); |
| /** |
| * Floating point utility to calculate the minimum value of two doubles. |
| * @internal |
| */ |
| U_INTERNAL double U_EXPORT2 uprv_fmin(double d, double y); |
| /** |
| * Private utility to calculate the maximum value of two integers. |
| * @internal |
| */ |
| U_INTERNAL int32_t U_EXPORT2 uprv_max(int32_t d, int32_t y); |
| /** |
| * Private utility to calculate the minimum value of two integers. |
| * @internal |
| */ |
| U_INTERNAL int32_t U_EXPORT2 uprv_min(int32_t d, int32_t y); |
| |
| #if U_IS_BIG_ENDIAN |
| # define uprv_isNegative(number) (*((signed char *)&(number))<0) |
| #else |
| # define uprv_isNegative(number) (*((signed char *)&(number)+sizeof(number)-1)<0) |
| #endif |
| |
| /** |
| * Return the largest positive number that can be represented by an integer |
| * type of arbitrary bit length. |
| * @internal |
| */ |
| U_INTERNAL double U_EXPORT2 uprv_maxMantissa(void); |
| |
| /** |
| * Floating point utility to calculate the logarithm of a double. |
| * @internal |
| */ |
| U_INTERNAL double U_EXPORT2 uprv_log(double d); |
| |
| /** |
| * Does common notion of rounding e.g. uprv_floor(x + 0.5); |
| * @param x the double number |
| * @return the rounded double |
| * @internal |
| */ |
| U_INTERNAL double U_EXPORT2 uprv_round(double x); |
| |
| #if 0 |
| /** |
| * Returns the number of digits after the decimal point in a double number x. |
| * |
| * @param x the double number |
| * @return the number of digits after the decimal point in a double number x. |
| * @internal |
| */ |
| /*U_INTERNAL int32_t U_EXPORT2 uprv_digitsAfterDecimal(double x);*/ |
| #endif |
| |
| /** |
| * 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 |
| * following meanings, and are declared in <time.h>. |
| * |
| * daylight Nonzero if daylight-saving-time zone (DST) is specified |
| * in TZ; otherwise, 0. Default value is 1. |
| * timezone Difference in seconds between coordinated universal |
| * time and local time. E.g., -28,800 for PST (GMT-8hrs) |
| * tzname(0) Three-letter time-zone name derived from TZ environment |
| * variable. E.g., "PST". |
| * tzname(1) Three-letter DST zone name derived from TZ environment |
| * variable. E.g., "PDT". If DST zone is omitted from TZ, |
| * tzname(1) is an empty string. |
| * |
| * Notes: For example, to set the TZ environment variable to correspond |
| * to the current time zone in Germany, you can use one of the |
| * following statements: |
| * |
| * set TZ=GST1GDT |
| * set TZ=GST+1GDT |
| * |
| * If the TZ value is not set, t_tzset() attempts to use the time zone |
| * information specified by the operating system. Under Windows NT |
| * and Windows 95, this information is specified in the Control Panel's |
| * Date/Time application. |
| * @internal |
| */ |
| U_INTERNAL void U_EXPORT2 uprv_tzset(void); |
| |
| /** |
| * Difference in seconds between coordinated universal |
| * time and local time. E.g., -28,800 for PST (GMT-8hrs) |
| * @return the difference in seconds between coordinated universal time and local time. |
| * @internal |
| */ |
| U_INTERNAL int32_t U_EXPORT2 uprv_timezone(void); |
| |
| /** |
| * tzname(0) Three-letter time-zone name derived from TZ environment |
| * variable. E.g., "PST". |
| * tzname(1) Three-letter DST zone name derived from TZ environment |
| * variable. E.g., "PDT". If DST zone is omitted from TZ, |
| * tzname(1) is an empty string. |
| * @internal |
| */ |
| U_INTERNAL const char* U_EXPORT2 uprv_tzname(int n); |
| |
| /** |
| * Get UTC (GMT) time measured in milliseconds since 0:00 on 1/1/1970. |
| * @return the UTC time measured in milliseconds |
| * @internal |
| */ |
| U_INTERNAL UDate U_EXPORT2 uprv_getUTCtime(void); |
| |
| /** |
| * Determine whether a pathname is absolute or not, as defined by the platform. |
| * @param path Pathname to test |
| * @return TRUE if the path is absolute |
| * @internal (ICU 3.0) |
| */ |
| U_INTERNAL UBool U_EXPORT2 uprv_pathIsAbsolute(const char *path); |
| |
| /** |
| * 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 |
| * the buffer limit and the buffer start can be expressed in an int32_t. |
| * |
| * The definition of U_MAX_PTR must fulfill the following conditions: |
| * - 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 |
| * |
| * @param base The beginning of a buffer to find the maximum offset from |
| * @internal |
| */ |
| #ifndef U_MAX_PTR |
| # if defined(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))) |
| # else |
| # define U_MAX_PTR(base) ((void *)(((char *)(base)+0x7fffffffu) > (char *)(base) ? ((char *)(base)+0x7fffffffu) : (char *)-1)) |
| # endif |
| #endif |
| |
| #endif |