--- /dev/null
+/* Decimal context header module for the decNumber C Library.
+ Copyright (C) 2005, 2007, 2009 Free Software Foundation, Inc.
+ Contributed by IBM Corporation. Author Mike Cowlishaw.
+
+ This file is part of GCC.
+
+ GCC is free software; you can redistribute it and/or modify it under
+ the terms of the GNU General Public License as published by the Free
+ Software Foundation; either version 3, or (at your option) any later
+ version.
+
+ GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+<http://www.gnu.org/licenses/>. */
+
+/* ------------------------------------------------------------------ */
+/* Decimal Context module header */
+/* ------------------------------------------------------------------ */
+/* */
+/* 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 */
+
+ #include "gstdint.h" /* C99 standard integers */
+ #include <stdio.h> /* for printf, etc. */
+ #include <signal.h> /* for traps */
+
+ /* Extended flags setting -- set this to 0 to use only IEEE flags */
+ #define DECEXTFLAG 1 /* 1=enable extended flags */
+
+ /* Conditional code flag -- set this to 0 for best performance */
+ #define DECSUBSET 0 /* 1=enable subset arithmetic */
+
+ /* 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 */
+
+ #include "decContextSymbols.h"
+
+ 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 uint32_t decContextTestSavedStatus(uint32_t, uint32_t);
+ extern uint32_t decContextTestStatus(decContext *, uint32_t);
+ extern decContext * decContextZeroStatus(decContext *);
+
+#endif
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