/* Decimal context header module for the decNumber C Library.
  Copyright (C) 2005-2018 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   */
 #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                                              */

 #include "decContextSymbols.h"

 #ifdef __cplusplus
 extern "C" {
 #endif

 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

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