| /* |
| ****************************************************************************** |
| * |
| * Copyright (C) 1997-2001, International Business Machines |
| * Corporation and others. All Rights Reserved. |
| * |
| ****************************************************************************** |
| * |
| * FILE NAME : putil.h |
| * |
| * Date Name Description |
| * 05/14/98 nos Creation (content moved here from utypes.h). |
| * 06/17/99 erm Added IEEE_754 |
| * 07/22/98 stephen Added IEEEremainder, max, min, trunc |
| * 08/13/98 stephen Added isNegativeInfinity, isPositiveInfinity |
| * 08/24/98 stephen Added longBitsFromDouble |
| * 03/02/99 stephen Removed openFile(). Added AS400 support. |
| * 04/15/99 stephen Converted to C |
| * 11/15/99 helena Integrated S/390 changes for IEEE support. |
| * 01/11/00 helena Added u_getVersion. |
| ****************************************************************************** |
| */ |
| |
| #ifndef PUTIL_H |
| #define PUTIL_H |
| |
| #include "unicode/utypes.h" |
| |
| /* 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 |
| |
| /*==========================================================================*/ |
| /* 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 utilities |
| */ |
| U_CAPI UBool U_EXPORT2 uprv_isNaN(double); |
| U_CAPI UBool U_EXPORT2 uprv_isInfinite(double); |
| U_CAPI UBool U_EXPORT2 uprv_isPositiveInfinity(double); |
| U_CAPI UBool U_EXPORT2 uprv_isNegativeInfinity(double); |
| U_CAPI double U_EXPORT2 uprv_getNaN(void); |
| U_CAPI double U_EXPORT2 uprv_getInfinity(void); |
| |
| U_CAPI double U_EXPORT2 uprv_trunc(double d); |
| U_CAPI double U_EXPORT2 uprv_floor(double x); |
| U_CAPI double U_EXPORT2 uprv_ceil(double x); |
| U_CAPI double U_EXPORT2 uprv_fabs(double x); |
| U_CAPI double U_EXPORT2 uprv_modf(double x, double* y); |
| U_CAPI double U_EXPORT2 uprv_fmod(double x, double y); |
| U_CAPI double U_EXPORT2 uprv_pow(double x, double y); |
| U_CAPI double U_EXPORT2 uprv_pow10(int32_t x); |
| U_CAPI double U_EXPORT2 uprv_fmax(double x, double y); |
| U_CAPI double U_EXPORT2 uprv_fmin(double x, double y); |
| U_CAPI int32_t U_EXPORT2 uprv_max(int32_t x, int32_t y); |
| U_CAPI int32_t U_EXPORT2 uprv_min(int32_t x, 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. |
| */ |
| U_CAPI 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. |
| */ |
| U_CAPI int16_t U_EXPORT2 uprv_log10(double d); |
| |
| U_CAPI double U_EXPORT2 uprv_log(double d); |
| |
| /** Does common notion of rounding e.g. uprv_floor(x + 0.5); */ |
| U_CAPI double U_EXPORT2 uprv_round(double x); |
| |
| /** |
| * Returns the number of digits after the decimal point in a double number x. |
| * |
| * @param x the double number |
| */ |
| U_CAPI int32_t U_EXPORT2 uprv_digitsAfterDecimal(double x); |
| |
| /** |
| * 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 Panels |
| * Date/Time application. |
| * @stable |
| */ |
| U_CAPI void U_EXPORT2 uprv_tzset(void); |
| |
| /** |
| * Difference in seconds between coordinated universal |
| * time and local time. E.g., -28,800 for PST (GMT-8hrs) |
| */ |
| U_CAPI 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. |
| */ |
| U_CAPI char* U_EXPORT2 uprv_tzname(int n); |
| |
| /** |
| * Get UTC (GMT) time measured in seconds since 0:00 on 1/1/70. |
| * @stable |
| */ |
| U_CAPI int32_t U_EXPORT2 uprv_getUTCtime(void); |
| |
| /** |
| * Return the ICU data directory. |
| * The data directory is where common format ICU data files (.dat files) |
| * are loaded from. Note that normal use of the built-in ICU |
| * facilities does not require loading of an external data file; |
| * unless you are adding custom data to ICU, the data directory |
| * does not need to be set. |
| * |
| * The data directory is determined as follows: |
| * If u_setDataDirectory() has been called, that is it, otherwise |
| * if the ICU_DATA environment variable is set, use that, otherwise |
| * On Windows, if the SOFTWARE\ICU\Unicode\Data registry entry exists, use that |
| * (use of the registry in this way is not recommended.) otherwise |
| * If a data directory was specifed at ICU build time, use that |
| * otherwise no data directory is available. |
| * |
| * @return the data directory, or an empty string ("") if no data directory has |
| * been specified. |
| * |
| * @stable |
| */ |
| U_CAPI const char* U_EXPORT2 u_getDataDirectory(void); |
| |
| /** |
| * Set the ICU data directory. |
| * The data directory is where common format ICU data files (.dat files) |
| * are loaded from. Note that normal use of the built-in ICU |
| * facilities does not require loading of an external data file; |
| * unless you are adding custom data to ICU, the data directory |
| * does not need to be set. |
| * |
| * This function should be called at most once in a process, before the |
| * first ICU operation that will require the loading of an ICU data file. |
| * |
| * @stable |
| */ |
| U_CAPI void U_EXPORT2 u_setDataDirectory(const char *directory); |
| |
| /** |
| * Return the default codepage for this platform and locale |
| * @stable |
| */ |
| U_CAPI const char* U_EXPORT2 uprv_getDefaultCodepage(void); |
| |
| /** |
| * Return the default locale ID string by querying ths system, or |
| * zero if one cannot be found. |
| * @stable |
| */ |
| U_CAPI const char* U_EXPORT2 uprv_getDefaultLocaleID(void); |
| |
| /* |
| * Finds the least double greater than d (if positive == true), |
| * or the greatest double less than d (if positive == false). |
| * |
| * This is a special purpose function defined by the ChoiceFormat API |
| * documentation. |
| * It is not a general purpose function and not defined for NaN or Infinity |
| * @deprecated This will be removed after 2002-Jun-30. Use the ChoiceFormat closures API instead. |
| */ |
| U_CAPI double U_EXPORT2 uprv_nextDouble(double d, UBool positive); |
| |
| /** |
| * Filesystem file and path separator characters. |
| * Example: '/' and ':' on Unix, '\\' and ';' on Windows. |
| * @stable |
| */ |
| #ifdef XP_MAC |
| # define U_FILE_SEP_CHAR ':' |
| # define U_PATH_SEP_CHAR ';' |
| # define U_FILE_SEP_STRING ":" |
| # define U_PATH_SEP_STRING ";" |
| #elif defined(WIN32) || defined(OS2) |
| # define U_FILE_SEP_CHAR '\\' |
| # define U_PATH_SEP_CHAR ';' |
| # define U_FILE_SEP_STRING "\\" |
| # define U_PATH_SEP_STRING ";" |
| #else |
| # define U_FILE_SEP_CHAR '/' |
| # define U_PATH_SEP_CHAR ':' |
| # define U_FILE_SEP_STRING "/" |
| # define U_PATH_SEP_STRING ":" |
| #endif |
| |
| /** |
| * Convert char characters to UChar characters. |
| * This utility function is useful only for "invariant characters" |
| * that are encoded in the platform default encoding. |
| * They are a small, constant subset of the encoding and include |
| * just the latin letters, digits, and some punctuation. |
| * For details, see utypes.h . |
| * |
| * @param cs Input string, points to <code>length</code> |
| * character bytes from a subset of the platform encoding. |
| * @param us Output string, points to memory for <code>length</code> |
| * Unicode characters. |
| * @param length The number of characters to convert; this may |
| * include the terminating <code>NUL</code>. |
| * @stable |
| */ |
| U_CAPI void U_EXPORT2 |
| u_charsToUChars(const char *cs, UChar *us, UTextOffset length); |
| |
| /** |
| * Convert UChar characters to char characters. |
| * This utility function is useful only for "invariant characters" |
| * that can be encoded in the platform default encoding. |
| * They are a small, constant subset of the encoding and include |
| * just the latin letters, digits, and some punctuation. |
| * For details, see utypes.h . |
| * |
| * @param us Input string, points to <code>length</code> |
| * Unicode characters that can be encoded with the |
| * codepage-invariant subset of the platform encoding. |
| * @param cs Output string, points to memory for <code>length</code> |
| * character bytes. |
| * @param length The number of characters to convert; this may |
| * include the terminating <code>NUL</code>. |
| * @stable |
| */ |
| U_CAPI void U_EXPORT2 |
| u_UCharsToChars(const UChar *us, char *cs, UTextOffset length); |
| |
| /* Define U_UPPER_ORDINAL */ |
| #if U_CHARSET_FAMILY==U_ASCII_FAMILY |
| # define U_UPPER_ORDINAL(x) ((x)-'A') |
| #elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY |
| # define U_UPPER_ORDINAL(x) (((x) < 'J') ? ((x)-'A') : \ |
| (((x) < 'S') ? ((x)-'J'+9) : \ |
| ((x)-'S'+18))) |
| #else |
| # error Unknown charset family! |
| #endif |
| |
| /** |
| * 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)+0x7fffffff) > (char *)(base) ? ((char *)(base)+0x7fffffff) : (char *)-1)) |
| # endif |
| #endif |
| |
| #endif |
