/* IBM_PROLOG_BEGIN_TAG */ /* This is an automatically generated prolog. */ /* */ /* bos72Q src/bos/usr/ccs/lib/libdecNumber/decContext.h 1.4.1.1 */ /* */ /* Licensed Materials - Property of IBM */ /* */ /* COPYRIGHT International Business Machines Corp. 2006,2019 */ /* All Rights Reserved */ /* */ /* US Government Users Restricted Rights - Use, duplication or */ /* disclosure restricted by GSA ADP Schedule Contract with IBM Corp. */ /* */ /* IBM_PROLOG_END_TAG */ /* @(#)95 1.4.1.1 src/bos/usr/ccs/lib/libdecNumber/decContext.h, libdecNumber, bos72Q, q2019_13A4 2/4/19 10:18:14 */ /* ------------------------------------------------------------------ */ /* Decimal Context module header */ /* ------------------------------------------------------------------ */ /* Copyright (c) IBM Corporation, 2000, 2007. 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, at: http://www2.hursley.ibm.com/decimal */ /* */ /* 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 */ /* ------------------------------------------------------------------ */ /* */ /* 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 /* C99 standard integers */ #endif #include /* for printf, etc. */ #include /* for traps */ #ifdef __cplusplus extern "C" { #endif /* 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 754r (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 854 groupings for the flags */ /* [DEC_Clamped, DEC_Lost_digits, DEC_Rounded, and DEC_Subnormal */ /* are not in IEEE 854] */ #define DEC_IEEE_854_Division_by_zero (DEC_Division_by_zero) #if DECSUBSET #define DEC_IEEE_854_Inexact (DEC_Inexact | DEC_Lost_digits) #else #define DEC_IEEE_854_Inexact (DEC_Inexact) #endif #define DEC_IEEE_854_Invalid_operation (DEC_Conversion_syntax | \ DEC_Division_impossible | \ DEC_Division_undefined | \ DEC_Insufficient_storage | \ DEC_Invalid_context | \ DEC_Invalid_operation) #define DEC_IEEE_854_Overflow (DEC_Overflow) #define DEC_IEEE_854_Underflow (DEC_Underflow) /* flags which are normally errors (result is qNaN, infinite, or 0) */ #define DEC_Errors (DEC_IEEE_854_Division_by_zero | \ DEC_IEEE_854_Invalid_operation | \ DEC_IEEE_854_Overflow | DEC_IEEE_854_Underflow) /* flags which cause a result to become qNaN */ #define DEC_NaNs DEC_IEEE_854_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 /* 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 */ extern decContext * decContextClearStatus(decContext *, uint32_t); extern decContext * decContextDefault(decContext *, int32_t); extern enum rounding decContextGetRounding(decContext *); extern uint32_t decContextGetStatus(decContext *); extern decContext * decContextRestoreStatus(decContext *, uint32_t, uint32_t); extern uint32_t decContextSaveStatus(decContext *, uint32_t); extern decContext * decContextSetRounding(decContext *, enum rounding); extern decContext * decContextSetStatus(decContext *, uint32_t); extern decContext * decContextSetStatusFromString(decContext *, const char *); extern decContext * decContextSetStatusFromStringQuiet(decContext *, const char *); extern decContext * decContextSetStatusQuiet(decContext *, uint32_t); extern const char * decContextStatusToString(const decContext *); extern int32_t decContextTestEndian(uint8_t); extern uint32_t decContextTestSavedStatus(uint32_t, uint32_t); extern uint32_t decContextTestStatus(decContext *, uint32_t); extern decContext * decContextZeroStatus(decContext *); #ifdef __cplusplus } #endif #endif