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comparison: intl/icu/source/i18n/decContext.h
intl/icu/source/i18n/decContext.h
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| -1:000000000000 | 0:5298f69de12e |
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| 1 /* ------------------------------------------------------------------ */ | |
| 2 /* Decimal Context module header */ | |
| 3 /* ------------------------------------------------------------------ */ | |
| 4 /* Copyright (c) IBM Corporation, 2000-2011. All rights reserved. */ | |
| 5 /* */ | |
| 6 /* This software is made available under the terms of the */ | |
| 7 /* ICU License -- ICU 1.8.1 and later. */ | |
| 8 /* */ | |
| 9 /* The description and User's Guide ("The decNumber C Library") for */ | |
| 10 /* this software is called decNumber.pdf. This document is */ | |
| 11 /* available, together with arithmetic and format specifications, */ | |
| 12 /* testcases, and Web links, on the General Decimal Arithmetic page. */ | |
| 13 /* */ | |
| 14 /* Please send comments, suggestions, and corrections to the author: */ | |
| 15 /* mfc@uk.ibm.com */ | |
| 16 /* Mike Cowlishaw, IBM Fellow */ | |
| 17 /* IBM UK, PO Box 31, Birmingham Road, Warwick CV34 5JL, UK */ | |
| 18 /* ------------------------------------------------------------------ */ | |
| 19 | |
| 20 /* Modified version, for use from within ICU. | |
| 21 * Renamed public functions, to avoid an unwanted export of the | |
| 22 * standard names from the ICU library. | |
| 23 * | |
| 24 * Use ICU's uprv_malloc() and uprv_free() | |
| 25 * | |
| 26 * Revert comment syntax to plain C | |
| 27 * | |
| 28 * Remove a few compiler warnings. | |
| 29 */ | |
| 30 #include "unicode/utypes.h" | |
| 31 #include "putilimp.h" | |
| 32 | |
| 33 /* */ | |
| 34 /* Context variables must always have valid values: */ | |
| 35 /* */ | |
| 36 /* status -- [any bits may be cleared, but not set, by user] */ | |
| 37 /* round -- must be one of the enumerated rounding modes */ | |
| 38 /* */ | |
| 39 /* The following variables are implied for fixed size formats (i.e., */ | |
| 40 /* they are ignored) but should still be set correctly in case used */ | |
| 41 /* with decNumber functions: */ | |
| 42 /* */ | |
| 43 /* clamp -- must be either 0 or 1 */ | |
| 44 /* digits -- must be in the range 1 through 999999999 */ | |
| 45 /* emax -- must be in the range 0 through 999999999 */ | |
| 46 /* emin -- must be in the range 0 through -999999999 */ | |
| 47 /* extended -- must be either 0 or 1 [present only if DECSUBSET] */ | |
| 48 /* traps -- only defined bits may be set */ | |
| 49 /* */ | |
| 50 /* ------------------------------------------------------------------ */ | |
| 51 | |
| 52 #if !defined(DECCONTEXT) | |
| 53 #define DECCONTEXT | |
| 54 #define DECCNAME "decContext" /* Short name */ | |
| 55 #define DECCFULLNAME "Decimal Context Descriptor" /* Verbose name */ | |
| 56 #define DECCAUTHOR "Mike Cowlishaw" /* Who to blame */ | |
| 57 | |
| 58 #if !defined(int32_t) | |
| 59 /* #include <stdint.h> */ /* C99 standard integers */ | |
| 60 #endif | |
| 61 #include <stdio.h> /* for printf, etc. */ | |
| 62 #include <signal.h> /* for traps */ | |
| 63 | |
| 64 /* Extended flags setting -- set this to 0 to use only IEEE flags */ | |
| 65 #if !defined(DECEXTFLAG) | |
| 66 #define DECEXTFLAG 1 /* 1=enable extended flags */ | |
| 67 #endif | |
| 68 | |
| 69 /* Conditional code flag -- set this to 0 for best performance */ | |
| 70 #if !defined(DECSUBSET) | |
| 71 #define DECSUBSET 0 /* 1=enable subset arithmetic */ | |
| 72 #endif | |
| 73 | |
| 74 /* Context for operations, with associated constants */ | |
| 75 enum rounding { | |
| 76 DEC_ROUND_CEILING, /* round towards +infinity */ | |
| 77 DEC_ROUND_UP, /* round away from 0 */ | |
| 78 DEC_ROUND_HALF_UP, /* 0.5 rounds up */ | |
| 79 DEC_ROUND_HALF_EVEN, /* 0.5 rounds to nearest even */ | |
| 80 DEC_ROUND_HALF_DOWN, /* 0.5 rounds down */ | |
| 81 DEC_ROUND_DOWN, /* round towards 0 (truncate) */ | |
| 82 DEC_ROUND_FLOOR, /* round towards -infinity */ | |
| 83 DEC_ROUND_05UP, /* round for reround */ | |
| 84 DEC_ROUND_MAX /* enum must be less than this */ | |
| 85 }; | |
| 86 #define DEC_ROUND_DEFAULT DEC_ROUND_HALF_EVEN; | |
| 87 | |
| 88 typedef struct { | |
| 89 int32_t digits; /* working precision */ | |
| 90 int32_t emax; /* maximum positive exponent */ | |
| 91 int32_t emin; /* minimum negative exponent */ | |
| 92 enum rounding round; /* rounding mode */ | |
| 93 uint32_t traps; /* trap-enabler flags */ | |
| 94 uint32_t status; /* status flags */ | |
| 95 uint8_t clamp; /* flag: apply IEEE exponent clamp */ | |
| 96 #if DECSUBSET | |
| 97 uint8_t extended; /* flag: special-values allowed */ | |
| 98 #endif | |
| 99 } decContext; | |
| 100 | |
| 101 /* Maxima and Minima for context settings */ | |
| 102 #define DEC_MAX_DIGITS 999999999 | |
| 103 #define DEC_MIN_DIGITS 1 | |
| 104 #define DEC_MAX_EMAX 999999999 | |
| 105 #define DEC_MIN_EMAX 0 | |
| 106 #define DEC_MAX_EMIN 0 | |
| 107 #define DEC_MIN_EMIN -999999999 | |
| 108 #define DEC_MAX_MATH 999999 /* max emax, etc., for math funcs. */ | |
| 109 | |
| 110 /* Classifications for decimal numbers, aligned with 754 (note that */ | |
| 111 /* 'normal' and 'subnormal' are meaningful only with a decContext */ | |
| 112 /* or a fixed size format). */ | |
| 113 enum decClass { | |
| 114 DEC_CLASS_SNAN, | |
| 115 DEC_CLASS_QNAN, | |
| 116 DEC_CLASS_NEG_INF, | |
| 117 DEC_CLASS_NEG_NORMAL, | |
| 118 DEC_CLASS_NEG_SUBNORMAL, | |
| 119 DEC_CLASS_NEG_ZERO, | |
| 120 DEC_CLASS_POS_ZERO, | |
| 121 DEC_CLASS_POS_SUBNORMAL, | |
| 122 DEC_CLASS_POS_NORMAL, | |
| 123 DEC_CLASS_POS_INF | |
| 124 }; | |
| 125 /* Strings for the decClasses */ | |
| 126 #define DEC_ClassString_SN "sNaN" | |
| 127 #define DEC_ClassString_QN "NaN" | |
| 128 #define DEC_ClassString_NI "-Infinity" | |
| 129 #define DEC_ClassString_NN "-Normal" | |
| 130 #define DEC_ClassString_NS "-Subnormal" | |
| 131 #define DEC_ClassString_NZ "-Zero" | |
| 132 #define DEC_ClassString_PZ "+Zero" | |
| 133 #define DEC_ClassString_PS "+Subnormal" | |
| 134 #define DEC_ClassString_PN "+Normal" | |
| 135 #define DEC_ClassString_PI "+Infinity" | |
| 136 #define DEC_ClassString_UN "Invalid" | |
| 137 | |
| 138 /* Trap-enabler and Status flags (exceptional conditions), and */ | |
| 139 /* their names. The top byte is reserved for internal use */ | |
| 140 #if DECEXTFLAG | |
| 141 /* Extended flags */ | |
| 142 #define DEC_Conversion_syntax 0x00000001 | |
| 143 #define DEC_Division_by_zero 0x00000002 | |
| 144 #define DEC_Division_impossible 0x00000004 | |
| 145 #define DEC_Division_undefined 0x00000008 | |
| 146 #define DEC_Insufficient_storage 0x00000010 /* [when malloc fails] */ | |
| 147 #define DEC_Inexact 0x00000020 | |
| 148 #define DEC_Invalid_context 0x00000040 | |
| 149 #define DEC_Invalid_operation 0x00000080 | |
| 150 #if DECSUBSET | |
| 151 #define DEC_Lost_digits 0x00000100 | |
| 152 #endif | |
| 153 #define DEC_Overflow 0x00000200 | |
| 154 #define DEC_Clamped 0x00000400 | |
| 155 #define DEC_Rounded 0x00000800 | |
| 156 #define DEC_Subnormal 0x00001000 | |
| 157 #define DEC_Underflow 0x00002000 | |
| 158 #else | |
| 159 /* IEEE flags only */ | |
| 160 #define DEC_Conversion_syntax 0x00000010 | |
| 161 #define DEC_Division_by_zero 0x00000002 | |
| 162 #define DEC_Division_impossible 0x00000010 | |
| 163 #define DEC_Division_undefined 0x00000010 | |
| 164 #define DEC_Insufficient_storage 0x00000010 /* [when malloc fails] */ | |
| 165 #define DEC_Inexact 0x00000001 | |
| 166 #define DEC_Invalid_context 0x00000010 | |
| 167 #define DEC_Invalid_operation 0x00000010 | |
| 168 #if DECSUBSET | |
| 169 #define DEC_Lost_digits 0x00000000 | |
| 170 #endif | |
| 171 #define DEC_Overflow 0x00000008 | |
| 172 #define DEC_Clamped 0x00000000 | |
| 173 #define DEC_Rounded 0x00000000 | |
| 174 #define DEC_Subnormal 0x00000000 | |
| 175 #define DEC_Underflow 0x00000004 | |
| 176 #endif | |
| 177 | |
| 178 /* IEEE 754 groupings for the flags */ | |
| 179 /* [DEC_Clamped, DEC_Lost_digits, DEC_Rounded, and DEC_Subnormal */ | |
| 180 /* are not in IEEE 754] */ | |
| 181 #define DEC_IEEE_754_Division_by_zero (DEC_Division_by_zero) | |
| 182 #if DECSUBSET | |
| 183 #define DEC_IEEE_754_Inexact (DEC_Inexact | DEC_Lost_digits) | |
| 184 #else | |
| 185 #define DEC_IEEE_754_Inexact (DEC_Inexact) | |
| 186 #endif | |
| 187 #define DEC_IEEE_754_Invalid_operation (DEC_Conversion_syntax | \ | |
| 188 DEC_Division_impossible | \ | |
| 189 DEC_Division_undefined | \ | |
| 190 DEC_Insufficient_storage | \ | |
| 191 DEC_Invalid_context | \ | |
| 192 DEC_Invalid_operation) | |
| 193 #define DEC_IEEE_754_Overflow (DEC_Overflow) | |
| 194 #define DEC_IEEE_754_Underflow (DEC_Underflow) | |
| 195 | |
| 196 /* flags which are normally errors (result is qNaN, infinite, or 0) */ | |
| 197 #define DEC_Errors (DEC_IEEE_754_Division_by_zero | \ | |
| 198 DEC_IEEE_754_Invalid_operation | \ | |
| 199 DEC_IEEE_754_Overflow | DEC_IEEE_754_Underflow) | |
| 200 /* flags which cause a result to become qNaN */ | |
| 201 #define DEC_NaNs DEC_IEEE_754_Invalid_operation | |
| 202 | |
| 203 /* flags which are normally for information only (finite results) */ | |
| 204 #if DECSUBSET | |
| 205 #define DEC_Information (DEC_Clamped | DEC_Rounded | DEC_Inexact \ | |
| 206 | DEC_Lost_digits) | |
| 207 #else | |
| 208 #define DEC_Information (DEC_Clamped | DEC_Rounded | DEC_Inexact) | |
| 209 #endif | |
| 210 | |
| 211 /* IEEE 854 names (for compatibility with older decNumber versions) */ | |
| 212 #define DEC_IEEE_854_Division_by_zero DEC_IEEE_754_Division_by_zero | |
| 213 #define DEC_IEEE_854_Inexact DEC_IEEE_754_Inexact | |
| 214 #define DEC_IEEE_854_Invalid_operation DEC_IEEE_754_Invalid_operation | |
| 215 #define DEC_IEEE_854_Overflow DEC_IEEE_754_Overflow | |
| 216 #define DEC_IEEE_854_Underflow DEC_IEEE_754_Underflow | |
| 217 | |
| 218 /* Name strings for the exceptional conditions */ | |
| 219 #define DEC_Condition_CS "Conversion syntax" | |
| 220 #define DEC_Condition_DZ "Division by zero" | |
| 221 #define DEC_Condition_DI "Division impossible" | |
| 222 #define DEC_Condition_DU "Division undefined" | |
| 223 #define DEC_Condition_IE "Inexact" | |
| 224 #define DEC_Condition_IS "Insufficient storage" | |
| 225 #define DEC_Condition_IC "Invalid context" | |
| 226 #define DEC_Condition_IO "Invalid operation" | |
| 227 #if DECSUBSET | |
| 228 #define DEC_Condition_LD "Lost digits" | |
| 229 #endif | |
| 230 #define DEC_Condition_OV "Overflow" | |
| 231 #define DEC_Condition_PA "Clamped" | |
| 232 #define DEC_Condition_RO "Rounded" | |
| 233 #define DEC_Condition_SU "Subnormal" | |
| 234 #define DEC_Condition_UN "Underflow" | |
| 235 #define DEC_Condition_ZE "No status" | |
| 236 #define DEC_Condition_MU "Multiple status" | |
| 237 #define DEC_Condition_Length 21 /* length of the longest string, */ | |
| 238 /* including terminator */ | |
| 239 | |
| 240 /* Initialization descriptors, used by decContextDefault */ | |
| 241 #define DEC_INIT_BASE 0 | |
| 242 #define DEC_INIT_DECIMAL32 32 | |
| 243 #define DEC_INIT_DECIMAL64 64 | |
| 244 #define DEC_INIT_DECIMAL128 128 | |
| 245 /* Synonyms */ | |
| 246 #define DEC_INIT_DECSINGLE DEC_INIT_DECIMAL32 | |
| 247 #define DEC_INIT_DECDOUBLE DEC_INIT_DECIMAL64 | |
| 248 #define DEC_INIT_DECQUAD DEC_INIT_DECIMAL128 | |
| 249 | |
| 250 /* decContext routines */ | |
| 251 U_INTERNAL decContext * U_EXPORT2 uprv_decContextClearStatus(decContext *, uint32_t); | |
| 252 U_INTERNAL decContext * U_EXPORT2 uprv_decContextDefault(decContext *, int32_t); | |
| 253 U_INTERNAL enum rounding U_EXPORT2 uprv_decContextGetRounding(decContext *); | |
| 254 U_INTERNAL uint32_t U_EXPORT2 uprv_decContextGetStatus(decContext *); | |
| 255 U_INTERNAL decContext * U_EXPORT2 uprv_decContextRestoreStatus(decContext *, uint32_t, uint32_t); | |
| 256 U_INTERNAL uint32_t U_EXPORT2 uprv_decContextSaveStatus(decContext *, uint32_t); | |
| 257 U_INTERNAL decContext * U_EXPORT2 uprv_decContextSetRounding(decContext *, enum rounding); | |
| 258 U_INTERNAL decContext * U_EXPORT2 uprv_decContextSetStatus(decContext *, uint32_t); | |
| 259 U_INTERNAL decContext * U_EXPORT2 uprv_decContextSetStatusFromString(decContext *, const char *); | |
| 260 U_INTERNAL decContext * U_EXPORT2 uprv_decContextSetStatusFromStringQuiet(decContext *, const char *); | |
| 261 U_INTERNAL decContext * U_EXPORT2 uprv_decContextSetStatusQuiet(decContext *, uint32_t); | |
| 262 U_INTERNAL const char * U_EXPORT2 uprv_decContextStatusToString(const decContext *); | |
| 263 U_INTERNAL int32_t U_EXPORT2 uprv_decContextTestEndian(uint8_t); | |
| 264 U_INTERNAL uint32_t U_EXPORT2 uprv_decContextTestSavedStatus(uint32_t, uint32_t); | |
| 265 U_INTERNAL uint32_t U_EXPORT2 uprv_decContextTestStatus(decContext *, uint32_t); | |
| 266 U_INTERNAL decContext * U_EXPORT2 uprv_decContextZeroStatus(decContext *); | |
| 267 | |
| 268 #endif |
