+/*
+******************************************************************************
+*
+* Copyright (C) 1997-2004, 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);
+
+/**
+ * Return the floor of the log base 10 of a given double.
+ * This method compensates for inaccuracies which arise naturally when
+ * computing logs, and always gives the correct value. The parameter
+ * must be positive and finite.
+ * (Thanks to Alan Liu for supplying this function.)
+ *
+ * @param d the double value to apply the common log function for.
+ * @return the log of value d.
+ * @internal
+ */
+U_INTERNAL int16_t U_EXPORT2 uprv_log10(double d);
+
+/**
+ * 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
+# ifdef OS390
+# 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
projects / apple / icu.git / blobdiff