1 /* Decimal number arithmetic module header for the decNumber C Library.
2 Copyright (C) 2005-2023 Free Software Foundation, Inc.
3 Contributed by IBM Corporation. Author Mike Cowlishaw.
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
10 version.
11
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
16
17 Under Section 7 of GPL version 3, you are granted additional
18 permissions described in the GCC Runtime Library Exception, version
19 3.1, as published by the Free Software Foundation.
20
21 You should have received a copy of the GNU General Public License and
22 a copy of the GCC Runtime Library Exception along with this program;
23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
24 <http://www.gnu.org/licenses/>. */
25
26 /* ------------------------------------------------------------------ */
27 /* Decimal Number arithmetic module header */
28 /* ------------------------------------------------------------------ */
29
30 #if !defined(DECNUMBER)
31 #define DECNUMBER
32 #define DECNAME "decNumber" /* Short name */
33 #define DECFULLNAME "Decimal Number Module" /* Verbose name */
34 #define DECAUTHOR "Mike Cowlishaw" /* Who to blame */
35
36 #if !defined(DECCONTEXT)
37 #include "decContext.h"
38 #endif
39
40 /* Bit settings for decNumber.bits */
41 #define DECNEG 0x80 /* Sign; 1=negative, 0=positive or zero */
42 #define DECINF 0x40 /* 1=Infinity */
43 #define DECNAN 0x20 /* 1=NaN */
44 #define DECSNAN 0x10 /* 1=sNaN */
45 /* The remaining bits are reserved; they must be 0 */
46 #define DECSPECIAL (DECINF|DECNAN|DECSNAN) /* any special value */
47
48 /* Define the decNumber data structure. The size and shape of the */
49 /* units array in the structure is determined by the following */
50 /* constant. This must not be changed without recompiling the */
51 /* decNumber library modules. */
52
53 #define DECDPUN 3 /* DECimal Digits Per UNit [must be >0 */
54 /* and <10; 3 or powers of 2 are best]. */
55
56 /* DECNUMDIGITS is the default number of digits that can be held in */
57 /* the structure. If undefined, 1 is assumed and it is assumed */
58 /* that the structure will be immediately followed by extra space, */
59 /* as required. DECNUMDIGITS is always >0. */
60 #if !defined(DECNUMDIGITS)
61 #define DECNUMDIGITS 1
62 #endif
63
64 /* The size (integer data type) of each unit is determined by the */
65 /* number of digits it will hold. */
66 #if DECDPUN<=2
67 #define decNumberUnit uint8_t
68 #elif DECDPUN<=4
69 #define decNumberUnit uint16_t
70 #else
71 #define decNumberUnit uint32_t
72 #endif
73 /* The number of units needed is ceil(DECNUMDIGITS/DECDPUN) */
74 #define DECNUMUNITS ((DECNUMDIGITS+DECDPUN-1)/DECDPUN)
75
76 /* The data structure... */
77 typedef struct {
78 int32_t digits; /* Count of digits in the coefficient; >0 */
79 int32_t exponent; /* Unadjusted exponent, unbiased, in */
80 /* range: -1999999997 through 999999999 */
81 uint8_t bits; /* Indicator bits (see above) */
82 /* Coefficient, from least significant unit */
83 decNumberUnit lsu[DECNUMUNITS];
84 } decNumber;
85
86 /* Notes: */
87 /* 1. If digits is > DECDPUN then there will one or more */
88 /* decNumberUnits immediately following the first element of lsu.*/
89 /* These contain the remaining (more significant) digits of the */
90 /* number, and may be in the lsu array, or may be guaranteed by */
91 /* some other mechanism (such as being contained in another */
92 /* structure, or being overlaid on dynamically allocated */
93 /* storage). */
94 /* */
95 /* Each integer of the coefficient (except potentially the last) */
96 /* contains DECDPUN digits (e.g., a value in the range 0 through */
97 /* 99999999 if DECDPUN is 8, or 0 through 999 if DECDPUN is 3). */
98 /* */
99 /* 2. A decNumber converted to a string may need up to digits+14 */
100 /* characters. The worst cases (non-exponential and exponential */
101 /* formats) are -0.00000{9...}# and -9.{9...}E+999999999# */
102 /* (where # is '\0') */
103
104
105 /* ---------------------------------------------------------------- */
106 /* decNumber public functions and macros */
107 /* ---------------------------------------------------------------- */
108
109 #include "decNumberSymbols.h"
110
111 #ifdef __cplusplus
112 extern "C" {
113 #endif
114
115 /* Conversions */
116 decNumber * decNumberFromInt32(decNumber *, int32_t);
117 decNumber * decNumberFromUInt32(decNumber *, uint32_t);
118 decNumber * decNumberFromString(decNumber *, const char *, decContext *);
119 char * decNumberToString(const decNumber *, char *);
120 char * decNumberToEngString(const decNumber *, char *);
121 uint32_t decNumberToUInt32(const decNumber *, decContext *);
122 int32_t decNumberToInt32(const decNumber *, decContext *);
123 uint8_t * decNumberGetBCD(const decNumber *, uint8_t *);
124 decNumber * decNumberSetBCD(decNumber *, const uint8_t *, uint32_t);
125
126 /* Operators and elementary functions */
127 decNumber * decNumberAbs(decNumber *, const decNumber *, decContext *);
128 decNumber * decNumberAdd(decNumber *, const decNumber *, const decNumber *, decContext *);
129 decNumber * decNumberAnd(decNumber *, const decNumber *, const decNumber *, decContext *);
130 decNumber * decNumberCompare(decNumber *, const decNumber *, const decNumber *, decContext *);
131 decNumber * decNumberCompareSignal(decNumber *, const decNumber *, const decNumber *, decContext *);
132 decNumber * decNumberCompareTotal(decNumber *, const decNumber *, const decNumber *, decContext *);
133 decNumber * decNumberCompareTotalMag(decNumber *, const decNumber *, const decNumber *, decContext *);
134 decNumber * decNumberDivide(decNumber *, const decNumber *, const decNumber *, decContext *);
135 decNumber * decNumberDivideInteger(decNumber *, const decNumber *, const decNumber *, decContext *);
136 decNumber * decNumberExp(decNumber *, const decNumber *, decContext *);
137 decNumber * decNumberFMA(decNumber *, const decNumber *, const decNumber *, const decNumber *, decContext *);
138 decNumber * decNumberInvert(decNumber *, const decNumber *, decContext *);
139 decNumber * decNumberLn(decNumber *, const decNumber *, decContext *);
140 decNumber * decNumberLogB(decNumber *, const decNumber *, decContext *);
141 decNumber * decNumberLog10(decNumber *, const decNumber *, decContext *);
142 decNumber * decNumberMax(decNumber *, const decNumber *, const decNumber *, decContext *);
143 decNumber * decNumberMaxMag(decNumber *, const decNumber *, const decNumber *, decContext *);
144 decNumber * decNumberMin(decNumber *, const decNumber *, const decNumber *, decContext *);
145 decNumber * decNumberMinMag(decNumber *, const decNumber *, const decNumber *, decContext *);
146 decNumber * decNumberMinus(decNumber *, const decNumber *, decContext *);
147 decNumber * decNumberMultiply(decNumber *, const decNumber *, const decNumber *, decContext *);
148 decNumber * decNumberNormalize(decNumber *, const decNumber *, decContext *);
149 decNumber * decNumberOr(decNumber *, const decNumber *, const decNumber *, decContext *);
150 decNumber * decNumberPlus(decNumber *, const decNumber *, decContext *);
151 decNumber * decNumberPower(decNumber *, const decNumber *, const decNumber *, decContext *);
152 decNumber * decNumberQuantize(decNumber *, const decNumber *, const decNumber *, decContext *);
153 decNumber * decNumberReduce(decNumber *, const decNumber *, decContext *);
154 decNumber * decNumberRemainder(decNumber *, const decNumber *, const decNumber *, decContext *);
155 decNumber * decNumberRemainderNear(decNumber *, const decNumber *, const decNumber *, decContext *);
156 decNumber * decNumberRescale(decNumber *, const decNumber *, const decNumber *, decContext *);
157 decNumber * decNumberRotate(decNumber *, const decNumber *, const decNumber *, decContext *);
158 decNumber * decNumberSameQuantum(decNumber *, const decNumber *, const decNumber *);
159 decNumber * decNumberScaleB(decNumber *, const decNumber *, const decNumber *, decContext *);
160 decNumber * decNumberShift(decNumber *, const decNumber *, const decNumber *, decContext *);
161 decNumber * decNumberSquareRoot(decNumber *, const decNumber *, decContext *);
162 decNumber * decNumberSubtract(decNumber *, const decNumber *, const decNumber *, decContext *);
163 decNumber * decNumberToIntegralExact(decNumber *, const decNumber *, decContext *);
164 decNumber * decNumberToIntegralValue(decNumber *, const decNumber *, decContext *);
165 decNumber * decNumberXor(decNumber *, const decNumber *, const decNumber *, decContext *);
166
167 /* Utilities */
168 enum decClass decNumberClass(const decNumber *, decContext *);
169 const char * decNumberClassToString(enum decClass);
170 decNumber * decNumberCopy(decNumber *, const decNumber *);
171 decNumber * decNumberCopyAbs(decNumber *, const decNumber *);
172 decNumber * decNumberCopyNegate(decNumber *, const decNumber *);
173 decNumber * decNumberCopySign(decNumber *, const decNumber *, const decNumber *);
174 decNumber * decNumberNextMinus(decNumber *, const decNumber *, decContext *);
175 decNumber * decNumberNextPlus(decNumber *, const decNumber *, decContext *);
176 decNumber * decNumberNextToward(decNumber *, const decNumber *, const decNumber *, decContext *);
177 decNumber * decNumberTrim(decNumber *);
178 const char * decNumberVersion(void);
179 decNumber * decNumberZero(decNumber *);
180
181 /* Functions for testing decNumbers (normality depends on context) */
182 int32_t decNumberIsNormal(const decNumber *, decContext *);
183 int32_t decNumberIsSubnormal(const decNumber *, decContext *);
184
185 /* Macros for testing decNumber *dn */
186 #define decNumberIsCanonical(dn) (1) /* All decNumbers are saintly */
187 #define decNumberIsFinite(dn) (((dn)->bits&DECSPECIAL)==0)
188 #define decNumberIsInfinite(dn) (((dn)->bits&DECINF)!=0)
189 #define decNumberIsNaN(dn) (((dn)->bits&(DECNAN|DECSNAN))!=0)
190 #define decNumberIsNegative(dn) (((dn)->bits&DECNEG)!=0)
191 #define decNumberIsQNaN(dn) (((dn)->bits&(DECNAN))!=0)
192 #define decNumberIsSNaN(dn) (((dn)->bits&(DECSNAN))!=0)
193 #define decNumberIsSpecial(dn) (((dn)->bits&DECSPECIAL)!=0)
194 #define decNumberIsZero(dn) (*(dn)->lsu==0 \
195 && (dn)->digits==1 \
196 && (((dn)->bits&DECSPECIAL)==0))
197 #define decNumberRadix(dn) (10)
198
199 #ifdef __cplusplus
200 }
201 #endif
202
203 #endif