| // © 2016 and later: Unicode, Inc. and others. | |
| // License & terms of use: http://www.unicode.org/copyright.html | |
| /* ------------------------------------------------------------------ */ | |
| /* Decimal Context module header */ | |
| /* ------------------------------------------------------------------ */ | |
| /* Copyright (c) IBM Corporation, 2000-2011. All rights reserved. */ | |
| /* */ | |
| /* This software is made available under the terms of the */ | |
| /* ICU License -- ICU 1.8.1 and later. */ | |
| /* */ | |
| /* The description and User's Guide ("The decNumber C Library") for */ | |
| /* this software is called decNumber.pdf. This document is */ | |
| /* available, together with arithmetic and format specifications, */ | |
| /* testcases, and Web links, on the General Decimal Arithmetic page. */ | |
| /* */ | |
| /* Please send comments, suggestions, and corrections to the author: */ | |
| /* mfc@uk.ibm.com */ | |
| /* Mike Cowlishaw, IBM Fellow */ | |
| /* IBM UK, PO Box 31, Birmingham Road, Warwick CV34 5JL, UK */ | |
| /* ------------------------------------------------------------------ */ | |
| /* Modified version, for use from within ICU. | |
| * Renamed public functions, to avoid an unwanted export of the | |
| * standard names from the ICU library. | |
| * | |
| * Use ICU's uprv_malloc() and uprv_free() | |
| * | |
| * Revert comment syntax to plain C | |
| * | |
| * Remove a few compiler warnings. | |
| */ | |
| #include "unicode/utypes.h" | |
| #include "putilimp.h" | |
| /* */ | |
| /* Context variables must always have valid values: */ | |
| /* */ | |
| /* status -- [any bits may be cleared, but not set, by user] */ | |
| /* round -- must be one of the enumerated rounding modes */ | |
| /* */ | |
| /* The following variables are implied for fixed size formats (i.e., */ | |
| /* they are ignored) but should still be set correctly in case used */ | |
| /* with decNumber functions: */ | |
| /* */ | |
| /* clamp -- must be either 0 or 1 */ | |
| /* digits -- must be in the range 1 through 999999999 */ | |
| /* emax -- must be in the range 0 through 999999999 */ | |
| /* emin -- must be in the range 0 through -999999999 */ | |
| /* extended -- must be either 0 or 1 [present only if DECSUBSET] */ | |
| /* traps -- only defined bits may be set */ | |
| /* */ | |
| /* ------------------------------------------------------------------ */ | |
| #if !defined(DECCONTEXT) | |
| #define DECCONTEXT | |
| #define DECCNAME "decContext" /* Short name */ | |
| #define DECCFULLNAME "Decimal Context Descriptor" /* Verbose name */ | |
| #define DECCAUTHOR "Mike Cowlishaw" /* Who to blame */ | |
| #if !defined(int32_t) | |
| /* #include <stdint.h> */ /* C99 standard integers */ | |
| #endif | |
| #include <stdio.h> /* for printf, etc. */ | |
| #include <signal.h> /* for traps */ | |
| /* Extended flags setting -- set this to 0 to use only IEEE flags */ | |
| #if !defined(DECEXTFLAG) | |
| #define DECEXTFLAG 1 /* 1=enable extended flags */ | |
| #endif | |
| /* Conditional code flag -- set this to 0 for best performance */ | |
| #if !defined(DECSUBSET) | |
| #define DECSUBSET 0 /* 1=enable subset arithmetic */ | |
| #endif | |
| /* Context for operations, with associated constants */ | |
| enum rounding { | |
| DEC_ROUND_CEILING, /* round towards +infinity */ | |
| DEC_ROUND_UP, /* round away from 0 */ | |
| DEC_ROUND_HALF_UP, /* 0.5 rounds up */ | |
| DEC_ROUND_HALF_EVEN, /* 0.5 rounds to nearest even */ | |
| DEC_ROUND_HALF_DOWN, /* 0.5 rounds down */ | |
| DEC_ROUND_DOWN, /* round towards 0 (truncate) */ | |
| DEC_ROUND_FLOOR, /* round towards -infinity */ | |
| DEC_ROUND_05UP, /* round for reround */ | |
| DEC_ROUND_MAX /* enum must be less than this */ | |
| }; | |
| #define DEC_ROUND_DEFAULT DEC_ROUND_HALF_EVEN; | |
| typedef struct { | |
| int32_t digits; /* working precision */ | |
| int32_t emax; /* maximum positive exponent */ | |
| int32_t emin; /* minimum negative exponent */ | |
| enum rounding round; /* rounding mode */ | |
| uint32_t traps; /* trap-enabler flags */ | |
| uint32_t status; /* status flags */ | |
| uint8_t clamp; /* flag: apply IEEE exponent clamp */ | |
| #if DECSUBSET | |
| uint8_t extended; /* flag: special-values allowed */ | |
| #endif | |
| } decContext; | |
| /* Maxima and Minima for context settings */ | |
| #define DEC_MAX_DIGITS 999999999 | |
| #define DEC_MIN_DIGITS 1 | |
| #define DEC_MAX_EMAX 999999999 | |
| #define DEC_MIN_EMAX 0 | |
| #define DEC_MAX_EMIN 0 | |
| #define DEC_MIN_EMIN -999999999 | |
| #define DEC_MAX_MATH 999999 /* max emax, etc., for math funcs. */ | |
| /* Classifications for decimal numbers, aligned with 754 (note that */ | |
| /* 'normal' and 'subnormal' are meaningful only with a decContext */ | |
| /* or a fixed size format). */ | |
| enum decClass { | |
| DEC_CLASS_SNAN, | |
| DEC_CLASS_QNAN, | |
| DEC_CLASS_NEG_INF, | |
| DEC_CLASS_NEG_NORMAL, | |
| DEC_CLASS_NEG_SUBNORMAL, | |
| DEC_CLASS_NEG_ZERO, | |
| DEC_CLASS_POS_ZERO, | |
| DEC_CLASS_POS_SUBNORMAL, | |
| DEC_CLASS_POS_NORMAL, | |
| DEC_CLASS_POS_INF | |
| }; | |
| /* Strings for the decClasses */ | |
| #define DEC_ClassString_SN "sNaN" | |
| #define DEC_ClassString_QN "NaN" | |
| #define DEC_ClassString_NI "-Infinity" | |
| #define DEC_ClassString_NN "-Normal" | |
| #define DEC_ClassString_NS "-Subnormal" | |
| #define DEC_ClassString_NZ "-Zero" | |
| #define DEC_ClassString_PZ "+Zero" | |
| #define DEC_ClassString_PS "+Subnormal" | |
| #define DEC_ClassString_PN "+Normal" | |
| #define DEC_ClassString_PI "+Infinity" | |
| #define DEC_ClassString_UN "Invalid" | |
| /* Trap-enabler and Status flags (exceptional conditions), and */ | |
| /* their names. The top byte is reserved for internal use */ | |
| #if DECEXTFLAG | |
| /* Extended flags */ | |
| #define DEC_Conversion_syntax 0x00000001 | |
| #define DEC_Division_by_zero 0x00000002 | |
| #define DEC_Division_impossible 0x00000004 | |
| #define DEC_Division_undefined 0x00000008 | |
| #define DEC_Insufficient_storage 0x00000010 /* [when malloc fails] */ | |
| #define DEC_Inexact 0x00000020 | |
| #define DEC_Invalid_context 0x00000040 | |
| #define DEC_Invalid_operation 0x00000080 | |
| #if DECSUBSET | |
| #define DEC_Lost_digits 0x00000100 | |
| #endif | |
| #define DEC_Overflow 0x00000200 | |
| #define DEC_Clamped 0x00000400 | |
| #define DEC_Rounded 0x00000800 | |
| #define DEC_Subnormal 0x00001000 | |
| #define DEC_Underflow 0x00002000 | |
| #else | |
| /* IEEE flags only */ | |
| #define DEC_Conversion_syntax 0x00000010 | |
| #define DEC_Division_by_zero 0x00000002 | |
| #define DEC_Division_impossible 0x00000010 | |
| #define DEC_Division_undefined 0x00000010 | |
| #define DEC_Insufficient_storage 0x00000010 /* [when malloc fails] */ | |
| #define DEC_Inexact 0x00000001 | |
| #define DEC_Invalid_context 0x00000010 | |
| #define DEC_Invalid_operation 0x00000010 | |
| #if DECSUBSET | |
| #define DEC_Lost_digits 0x00000000 | |
| #endif | |
| #define DEC_Overflow 0x00000008 | |
| #define DEC_Clamped 0x00000000 | |
| #define DEC_Rounded 0x00000000 | |
| #define DEC_Subnormal 0x00000000 | |
| #define DEC_Underflow 0x00000004 | |
| #endif | |
| /* IEEE 754 groupings for the flags */ | |
| /* [DEC_Clamped, DEC_Lost_digits, DEC_Rounded, and DEC_Subnormal */ | |
| /* are not in IEEE 754] */ | |
| #define DEC_IEEE_754_Division_by_zero (DEC_Division_by_zero) | |
| #if DECSUBSET | |
| #define DEC_IEEE_754_Inexact (DEC_Inexact | DEC_Lost_digits) | |
| #else | |
| #define DEC_IEEE_754_Inexact (DEC_Inexact) | |
| #endif | |
| #define DEC_IEEE_754_Invalid_operation (DEC_Conversion_syntax | \ | |
| DEC_Division_impossible | \ | |
| DEC_Division_undefined | \ | |
| DEC_Insufficient_storage | \ | |
| DEC_Invalid_context | \ | |
| DEC_Invalid_operation) | |
| #define DEC_IEEE_754_Overflow (DEC_Overflow) | |
| #define DEC_IEEE_754_Underflow (DEC_Underflow) | |
| /* flags which are normally errors (result is qNaN, infinite, or 0) */ | |
| #define DEC_Errors (DEC_IEEE_754_Division_by_zero | \ | |
| DEC_IEEE_754_Invalid_operation | \ | |
| DEC_IEEE_754_Overflow | DEC_IEEE_754_Underflow) | |
| /* flags which cause a result to become qNaN */ | |
| #define DEC_NaNs DEC_IEEE_754_Invalid_operation | |
| /* flags which are normally for information only (finite results) */ | |
| #if DECSUBSET | |
| #define DEC_Information (DEC_Clamped | DEC_Rounded | DEC_Inexact \ | |
| | DEC_Lost_digits) | |
| #else | |
| #define DEC_Information (DEC_Clamped | DEC_Rounded | DEC_Inexact) | |
| #endif | |
| /* IEEE 854 names (for compatibility with older decNumber versions) */ | |
| #define DEC_IEEE_854_Division_by_zero DEC_IEEE_754_Division_by_zero | |
| #define DEC_IEEE_854_Inexact DEC_IEEE_754_Inexact | |
| #define DEC_IEEE_854_Invalid_operation DEC_IEEE_754_Invalid_operation | |
| #define DEC_IEEE_854_Overflow DEC_IEEE_754_Overflow | |
| #define DEC_IEEE_854_Underflow DEC_IEEE_754_Underflow | |
| /* Name strings for the exceptional conditions */ | |
| #define DEC_Condition_CS "Conversion syntax" | |
| #define DEC_Condition_DZ "Division by zero" | |
| #define DEC_Condition_DI "Division impossible" | |
| #define DEC_Condition_DU "Division undefined" | |
| #define DEC_Condition_IE "Inexact" | |
| #define DEC_Condition_IS "Insufficient storage" | |
| #define DEC_Condition_IC "Invalid context" | |
| #define DEC_Condition_IO "Invalid operation" | |
| #if DECSUBSET | |
| #define DEC_Condition_LD "Lost digits" | |
| #endif | |
| #define DEC_Condition_OV "Overflow" | |
| #define DEC_Condition_PA "Clamped" | |
| #define DEC_Condition_RO "Rounded" | |
| #define DEC_Condition_SU "Subnormal" | |
| #define DEC_Condition_UN "Underflow" | |
| #define DEC_Condition_ZE "No status" | |
| #define DEC_Condition_MU "Multiple status" | |
| #define DEC_Condition_Length 21 /* length of the longest string, */ | |
| /* including terminator */ | |
| /* Initialization descriptors, used by decContextDefault */ | |
| #define DEC_INIT_BASE 0 | |
| #define DEC_INIT_DECIMAL32 32 | |
| #define DEC_INIT_DECIMAL64 64 | |
| #define DEC_INIT_DECIMAL128 128 | |
| /* Synonyms */ | |
| #define DEC_INIT_DECSINGLE DEC_INIT_DECIMAL32 | |
| #define DEC_INIT_DECDOUBLE DEC_INIT_DECIMAL64 | |
| #define DEC_INIT_DECQUAD DEC_INIT_DECIMAL128 | |
| /* decContext routines */ | |
| U_INTERNAL decContext * U_EXPORT2 uprv_decContextClearStatus(decContext *, uint32_t); | |
| U_INTERNAL decContext * U_EXPORT2 uprv_decContextDefault(decContext *, int32_t); | |
| U_INTERNAL enum rounding U_EXPORT2 uprv_decContextGetRounding(decContext *); | |
| U_INTERNAL uint32_t U_EXPORT2 uprv_decContextGetStatus(decContext *); | |
| U_INTERNAL decContext * U_EXPORT2 uprv_decContextRestoreStatus(decContext *, uint32_t, uint32_t); | |
| U_INTERNAL uint32_t U_EXPORT2 uprv_decContextSaveStatus(decContext *, uint32_t); | |
| U_INTERNAL decContext * U_EXPORT2 uprv_decContextSetRounding(decContext *, enum rounding); | |
| U_INTERNAL decContext * U_EXPORT2 uprv_decContextSetStatus(decContext *, uint32_t); | |
| U_INTERNAL decContext * U_EXPORT2 uprv_decContextSetStatusFromString(decContext *, const char *); | |
| U_INTERNAL decContext * U_EXPORT2 uprv_decContextSetStatusFromStringQuiet(decContext *, const char *); | |
| U_INTERNAL decContext * U_EXPORT2 uprv_decContextSetStatusQuiet(decContext *, uint32_t); | |
| U_INTERNAL const char * U_EXPORT2 uprv_decContextStatusToString(const decContext *); | |
| U_INTERNAL int32_t U_EXPORT2 uprv_decContextTestEndian(uint8_t); | |
| U_INTERNAL uint32_t U_EXPORT2 uprv_decContextTestSavedStatus(uint32_t, uint32_t); | |
| U_INTERNAL uint32_t U_EXPORT2 uprv_decContextTestStatus(decContext *, uint32_t); | |
| U_INTERNAL decContext * U_EXPORT2 uprv_decContextZeroStatus(decContext *); | |
| #endif |