/src/icu/icu4c/source/i18n/decContext.cpp

Source (jump to first uncovered line)
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/* ------------------------------------------------------------------ */
/* Decimal Context module                                             */
/* ------------------------------------------------------------------ */
/* Copyright (c) IBM Corporation, 2000-2012.  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, on the General Decimal Arithmetic page.  */
/*                                                                    */
/* 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         */
/* ------------------------------------------------------------------ */
/* This module comprises the routines for handling arithmetic         */
/* context structures.                                                */
/* ------------------------------------------------------------------ */

#include <string.h>           /* for strcmp  */
#include <stdio.h>            /* for printf if DECCHECK  */
#include "decContext.h"       /* context and base types  */
#include "decNumberLocal.h"   /* decNumber local types, etc.  */

#if 0  /* ICU: No need to test endianness at runtime. */
/* compile-time endian tester [assumes sizeof(Int)>1] */
static  const  Int mfcone=1;                 /* constant 1  */
static  const  Flag *mfctop=(Flag *)&mfcone; /* -> top byte  */
#define LITEND *mfctop             /* named flag; 1=little-endian  */
#endif

/* ------------------------------------------------------------------ */
/* decContextClearStatus -- clear bits in current status              */
/*                                                                    */
/*  context is the context structure to be queried                    */
/*  mask indicates the bits to be cleared (the status bit that        */
/*    corresponds to each 1 bit in the mask is cleared)               */
/*  returns context                                                   */
/*                                                                    */
/* No error is possible.                                              */
/* ------------------------------------------------------------------ */
U_CAPI decContext * U_EXPORT2 uprv_decContextClearStatus(decContext *context, uInt mask) {
  context->status&=~mask;
  return context;
  } /* decContextClearStatus  */

/* ------------------------------------------------------------------ */
/* decContextDefault -- initialize a context structure                */
/*                                                                    */
/*  context is the structure to be initialized                        */
/*  kind selects the required set of default values, one of:          */
/*      DEC_INIT_BASE       -- select ANSI X3-274 defaults            */
/*      DEC_INIT_DECIMAL32  -- select IEEE 754 defaults, 32-bit       */
/*      DEC_INIT_DECIMAL64  -- select IEEE 754 defaults, 64-bit       */
/*      DEC_INIT_DECIMAL128 -- select IEEE 754 defaults, 128-bit      */
/*      For any other value a valid context is returned, but with     */
/*      Invalid_operation set in the status field.                    */
/*  returns a context structure with the appropriate initial values.  */
/* ------------------------------------------------------------------ */
U_CAPI decContext *  U_EXPORT2 uprv_decContextDefault(decContext *context, Int kind) {
  /* set defaults...  */
  context->digits=9;                         /* 9 digits  */
  context->emax=DEC_MAX_EMAX;                /* 9-digit exponents  */
  context->emin=DEC_MIN_EMIN;                /* .. balanced  */
  context->round=DEC_ROUND_HALF_UP;          /* 0.5 rises  */
  context->traps=DEC_Errors;                 /* all but informational  */
  context->status=0;                         /* cleared  */
  context->clamp=0;                          /* no clamping  */
  #if DECSUBSET
  context->extended=0;                       /* cleared  */
  #endif
  switch (kind) {
    case DEC_INIT_BASE:
      /* [use defaults]  */
      break;
    case DEC_INIT_DECIMAL32:
      context->digits=7;                     /* digits  */
      context->emax=96;                      /* Emax  */
      context->emin=-95;                     /* Emin  */
      context->round=DEC_ROUND_HALF_EVEN;    /* 0.5 to nearest even  */
      context->traps=0;                      /* no traps set  */
      context->clamp=1;                      /* clamp exponents  */
      #if DECSUBSET
      context->extended=1;                   /* set  */
      #endif
      break;
    case DEC_INIT_DECIMAL64:
      context->digits=16;                    /* digits  */
      context->emax=384;                     /* Emax  */
      context->emin=-383;                    /* Emin  */
      context->round=DEC_ROUND_HALF_EVEN;    /* 0.5 to nearest even  */
      context->traps=0;                      /* no traps set  */
      context->clamp=1;                      /* clamp exponents  */
      #if DECSUBSET
      context->extended=1;                   /* set  */
      #endif
      break;
    case DEC_INIT_DECIMAL128:
      context->digits=34;                    /* digits  */
      context->emax=6144;                    /* Emax  */
      context->emin=-6143;                   /* Emin  */
      context->round=DEC_ROUND_HALF_EVEN;    /* 0.5 to nearest even  */
      context->traps=0;                      /* no traps set  */
      context->clamp=1;                      /* clamp exponents  */
      #if DECSUBSET
      context->extended=1;                   /* set  */
      #endif
      break;

    default:                                 /* invalid Kind  */
      /* use defaults, and ..  */
      uprv_decContextSetStatus(context, DEC_Invalid_operation); /* trap  */
    }

  return context;} /* decContextDefault  */

/* ------------------------------------------------------------------ */
/* decContextGetRounding -- return current rounding mode              */
/*                                                                    */
/*  context is the context structure to be queried                    */
/*  returns the rounding mode                                         */
/*                                                                    */
/* No error is possible.                                              */
/* ------------------------------------------------------------------ */
U_CAPI enum rounding  U_EXPORT2 uprv_decContextGetRounding(decContext *context) {
  return context->round;
  } /* decContextGetRounding  */

/* ------------------------------------------------------------------ */
/* decContextGetStatus -- return current status                       */
/*                                                                    */
/*  context is the context structure to be queried                    */
/*  returns status                                                    */
/*                                                                    */
/* No error is possible.                                              */
/* ------------------------------------------------------------------ */
U_CAPI uInt  U_EXPORT2 uprv_decContextGetStatus(decContext *context) {
  return context->status;
  } /* decContextGetStatus  */

/* ------------------------------------------------------------------ */
/* decContextRestoreStatus -- restore bits in current status          */
/*                                                                    */
/*  context is the context structure to be updated                    */
/*  newstatus is the source for the bits to be restored               */
/*  mask indicates the bits to be restored (the status bit that       */
/*    corresponds to each 1 bit in the mask is set to the value of    */
/*    the corresponding bit in newstatus)                              */
/*  returns context                                                   */
/*                                                                    */
/* No error is possible.                                              */
/* ------------------------------------------------------------------ */
U_CAPI decContext * U_EXPORT2 uprv_decContextRestoreStatus(decContext *context,
                                    uInt newstatus, uInt mask) {
  context->status&=~mask;               /* clear the selected bits  */
  context->status|=(mask&newstatus);    /* or in the new bits  */
  return context;
  } /* decContextRestoreStatus  */

/* ------------------------------------------------------------------ */
/* decContextSaveStatus -- save bits in current status                */
/*                                                                    */
/*  context is the context structure to be queried                    */
/*  mask indicates the bits to be saved (the status bits that         */
/*    correspond to each 1 bit in the mask are saved)                 */
/*  returns the AND of the mask and the current status                */
/*                                                                    */
/* No error is possible.                                              */
/* ------------------------------------------------------------------ */
U_CAPI uInt  U_EXPORT2 uprv_decContextSaveStatus(decContext *context, uInt mask) {
  return context->status&mask;
  } /* decContextSaveStatus  */

/* ------------------------------------------------------------------ */
/* decContextSetRounding -- set current rounding mode                 */
/*                                                                    */
/*  context is the context structure to be updated                    */
/*  newround is the value which will replace the current mode         */
/*  returns context                                                   */
/*                                                                    */
/* No error is possible.                                              */
/* ------------------------------------------------------------------ */
U_CAPI decContext * U_EXPORT2 uprv_decContextSetRounding(decContext *context,
                                  enum rounding newround) {
  context->round=newround;
  return context;
  } /* decContextSetRounding  */

/* ------------------------------------------------------------------ */
/* decContextSetStatus -- set status and raise trap if appropriate    */
/*                                                                    */
/*  context is the context structure to be updated                    */
/*  status  is the DEC_ exception code                                */
/*  returns the context structure                                     */
/*                                                                    */
/* Control may never return from this routine, if there is a signal   */
/* handler and it takes a long jump.                                  */
/* ------------------------------------------------------------------ */
U_CAPI decContext *  U_EXPORT2 uprv_decContextSetStatus(decContext *context, uInt status) {
  context->status|=status;
#if 0  /* ICU: Do not raise signals. */
  if (status & context->traps) raise(SIGFPE);
#endif
  return context;} /* decContextSetStatus  */

/* ------------------------------------------------------------------ */
/* decContextSetStatusFromString -- set status from a string + trap   */
/*                                                                    */
/*  context is the context structure to be updated                    */
/*  string is a string exactly equal to one that might be returned    */
/*            by decContextStatusToString                             */
/*                                                                    */
/*  The status bit corresponding to the string is set, and a trap     */
/*  is raised if appropriate.                                         */
/*                                                                    */
/*  returns the context structure, unless the string is equal to      */
/*    DEC_Condition_MU or is not recognized.  In these cases nullptr is  */
/*    returned.                                                       */
/* ------------------------------------------------------------------ */
U_CAPI decContext *  U_EXPORT2 uprv_decContextSetStatusFromString(decContext *context,
                                           const char *string) {
  if (strcmp(string, DEC_Condition_CS)==0)
    return uprv_decContextSetStatus(context, DEC_Conversion_syntax);
  if (strcmp(string, DEC_Condition_DZ)==0)
    return uprv_decContextSetStatus(context, DEC_Division_by_zero);
  if (strcmp(string, DEC_Condition_DI)==0)
    return uprv_decContextSetStatus(context, DEC_Division_impossible);
  if (strcmp(string, DEC_Condition_DU)==0)
    return uprv_decContextSetStatus(context, DEC_Division_undefined);
  if (strcmp(string, DEC_Condition_IE)==0)
    return uprv_decContextSetStatus(context, DEC_Inexact);
  if (strcmp(string, DEC_Condition_IS)==0)
    return uprv_decContextSetStatus(context, DEC_Insufficient_storage);
  if (strcmp(string, DEC_Condition_IC)==0)
    return uprv_decContextSetStatus(context, DEC_Invalid_context);
  if (strcmp(string, DEC_Condition_IO)==0)
    return uprv_decContextSetStatus(context, DEC_Invalid_operation);
  #if DECSUBSET
  if (strcmp(string, DEC_Condition_LD)==0)
    return uprv_decContextSetStatus(context, DEC_Lost_digits);
  #endif
  if (strcmp(string, DEC_Condition_OV)==0)
    return uprv_decContextSetStatus(context, DEC_Overflow);
  if (strcmp(string, DEC_Condition_PA)==0)
    return uprv_decContextSetStatus(context, DEC_Clamped);
  if (strcmp(string, DEC_Condition_RO)==0)
    return uprv_decContextSetStatus(context, DEC_Rounded);
  if (strcmp(string, DEC_Condition_SU)==0)
    return uprv_decContextSetStatus(context, DEC_Subnormal);
  if (strcmp(string, DEC_Condition_UN)==0)
    return uprv_decContextSetStatus(context, DEC_Underflow);
  if (strcmp(string, DEC_Condition_ZE)==0)
    return context;
  return nullptr;  /* Multiple status, or unknown  */
  } /* decContextSetStatusFromString  */

/* ------------------------------------------------------------------ */
/* decContextSetStatusFromStringQuiet -- set status from a string     */
/*                                                                    */
/*  context is the context structure to be updated                    */
/*  string is a string exactly equal to one that might be returned    */
/*            by decContextStatusToString                             */
/*                                                                    */
/*  The status bit corresponding to the string is set; no trap is     */
/*  raised.                                                           */
/*                                                                    */
/*  returns the context structure, unless the string is equal to      */
/*    DEC_Condition_MU or is not recognized.  In these cases nullptr is  */
/*    returned.                                                       */
/* ------------------------------------------------------------------ */
U_CAPI decContext *  U_EXPORT2 uprv_decContextSetStatusFromStringQuiet(decContext *context,
                                                const char *string) {
  if (strcmp(string, DEC_Condition_CS)==0)
    return uprv_decContextSetStatusQuiet(context, DEC_Conversion_syntax);
  if (strcmp(string, DEC_Condition_DZ)==0)
    return uprv_decContextSetStatusQuiet(context, DEC_Division_by_zero);
  if (strcmp(string, DEC_Condition_DI)==0)
    return uprv_decContextSetStatusQuiet(context, DEC_Division_impossible);
  if (strcmp(string, DEC_Condition_DU)==0)
    return uprv_decContextSetStatusQuiet(context, DEC_Division_undefined);
  if (strcmp(string, DEC_Condition_IE)==0)
    return uprv_decContextSetStatusQuiet(context, DEC_Inexact);
  if (strcmp(string, DEC_Condition_IS)==0)
    return uprv_decContextSetStatusQuiet(context, DEC_Insufficient_storage);
  if (strcmp(string, DEC_Condition_IC)==0)
    return uprv_decContextSetStatusQuiet(context, DEC_Invalid_context);
  if (strcmp(string, DEC_Condition_IO)==0)
    return uprv_decContextSetStatusQuiet(context, DEC_Invalid_operation);
  #if DECSUBSET
  if (strcmp(string, DEC_Condition_LD)==0)
    return uprv_decContextSetStatusQuiet(context, DEC_Lost_digits);
  #endif
  if (strcmp(string, DEC_Condition_OV)==0)
    return uprv_decContextSetStatusQuiet(context, DEC_Overflow);
  if (strcmp(string, DEC_Condition_PA)==0)
    return uprv_decContextSetStatusQuiet(context, DEC_Clamped);
  if (strcmp(string, DEC_Condition_RO)==0)
    return uprv_decContextSetStatusQuiet(context, DEC_Rounded);
  if (strcmp(string, DEC_Condition_SU)==0)
    return uprv_decContextSetStatusQuiet(context, DEC_Subnormal);
  if (strcmp(string, DEC_Condition_UN)==0)
    return uprv_decContextSetStatusQuiet(context, DEC_Underflow);
  if (strcmp(string, DEC_Condition_ZE)==0)
    return context;
  return nullptr;  /* Multiple status, or unknown  */
  } /* decContextSetStatusFromStringQuiet  */

/* ------------------------------------------------------------------ */
/* decContextSetStatusQuiet -- set status without trap                */
/*                                                                    */
/*  context is the context structure to be updated                    */
/*  status  is the DEC_ exception code                                */
/*  returns the context structure                                     */
/*                                                                    */
/* No error is possible.                                              */
/* ------------------------------------------------------------------ */
U_CAPI decContext *  U_EXPORT2 uprv_decContextSetStatusQuiet(decContext *context, uInt status) {
  context->status|=status;
  return context;} /* decContextSetStatusQuiet  */

/* ------------------------------------------------------------------ */
/* decContextStatusToString -- convert status flags to a string       */
/*                                                                    */
/*  context is a context with valid status field                      */
/*                                                                    */
/*  returns a constant string describing the condition.  If multiple  */
/*    (or no) flags are set, a generic constant message is returned.  */
/* ------------------------------------------------------------------ */
U_CAPI const char * U_EXPORT2 uprv_decContextStatusToString(const decContext *context) {
  Int status=context->status;

  /* test the five IEEE first, as some of the others are ambiguous when  */
  /* DECEXTFLAG=0  */
  if (status==DEC_Invalid_operation    ) return DEC_Condition_IO;
  if (status==DEC_Division_by_zero     ) return DEC_Condition_DZ;
  if (status==DEC_Overflow             ) return DEC_Condition_OV;
  if (status==DEC_Underflow            ) return DEC_Condition_UN;
  if (status==DEC_Inexact              ) return DEC_Condition_IE;

  if (status==DEC_Division_impossible  ) return DEC_Condition_DI;
  if (status==DEC_Division_undefined   ) return DEC_Condition_DU;
  if (status==DEC_Rounded              ) return DEC_Condition_RO;
  if (status==DEC_Clamped              ) return DEC_Condition_PA;
  if (status==DEC_Subnormal            ) return DEC_Condition_SU;
  if (status==DEC_Conversion_syntax    ) return DEC_Condition_CS;
  if (status==DEC_Insufficient_storage ) return DEC_Condition_IS;
  if (status==DEC_Invalid_context      ) return DEC_Condition_IC;
  #if DECSUBSET
  if (status==DEC_Lost_digits          ) return DEC_Condition_LD;
  #endif
  if (status==0                        ) return DEC_Condition_ZE;
  return DEC_Condition_MU;  /* Multiple errors  */
  } /* decContextStatusToString  */

/* ------------------------------------------------------------------ */
/* decContextTestEndian -- test whether DECLITEND is set correctly    */
/*                                                                    */
/*  quiet is 1 to suppress message; 0 otherwise                       */
/*  returns 0 if DECLITEND is correct                                 */
/*          1 if DECLITEND is incorrect and should be 1               */
/*         -1 if DECLITEND is incorrect and should be 0               */
/*                                                                    */
/* A message is displayed if the return value is not 0 and quiet==0.  */
/*                                                                    */
/* No error is possible.                                              */
/* ------------------------------------------------------------------ */
#if 0  /* ICU: Unused function. Anyway, do not call printf(). */
U_CAPI Int  U_EXPORT2 uprv_decContextTestEndian(Flag quiet) {
  Int res=0;                  /* optimist  */
  uInt dle=(uInt)DECLITEND;   /* unsign  */
  if (dle>1) dle=1;           /* ensure 0 or 1  */

  if (LITEND!=DECLITEND) {
    const char *adj;
    if (!quiet) {
      if (LITEND) adj="little";
             else adj="big";
      printf("Warning: DECLITEND is set to %d, but this computer appears to be %s-endian\n",
             DECLITEND, adj);
      }
    res=(Int)LITEND-dle;
    }
  return res;
  } /* decContextTestEndian  */
#endif

/* ------------------------------------------------------------------ */
/* decContextTestSavedStatus -- test bits in saved status             */
/*                                                                    */
/*  oldstatus is the status word to be tested                         */
/*  mask indicates the bits to be tested (the oldstatus bits that     */
/*    correspond to each 1 bit in the mask are tested)                */
/*  returns 1 if any of the tested bits are 1, or 0 otherwise         */
/*                                                                    */
/* No error is possible.                                              */
/* ------------------------------------------------------------------ */
U_CAPI  uInt U_EXPORT2 uprv_decContextTestSavedStatus(uInt oldstatus, uInt mask) {
  return (oldstatus&mask)!=0;
  } /* decContextTestSavedStatus  */

/* ------------------------------------------------------------------ */
/* decContextTestStatus -- test bits in current status                */
/*                                                                    */
/*  context is the context structure to be updated                    */
/*  mask indicates the bits to be tested (the status bits that        */
/*    correspond to each 1 bit in the mask are tested)                */
/*  returns 1 if any of the tested bits are 1, or 0 otherwise         */
/*                                                                    */
/* No error is possible.                                              */
/* ------------------------------------------------------------------ */
U_CAPI uInt  U_EXPORT2 uprv_decContextTestStatus(decContext *context, uInt mask) {
  return (context->status&mask)!=0;
  } /* decContextTestStatus  */

/* ------------------------------------------------------------------ */
/* decContextZeroStatus -- clear all status bits                      */
/*                                                                    */
/*  context is the context structure to be updated                    */
/*  returns context                                                   */
/*                                                                    */
/* No error is possible.                                              */
/* ------------------------------------------------------------------ */
U_CAPI decContext * U_EXPORT2 uprv_decContextZeroStatus(decContext *context) {
  context->status=0;
  return context;
  } /* decContextZeroStatus  */


Coverage Report

Created: 2025-06-13 06:34

Line	Count	Source (jump to first uncovered line)
1		// © 2016 and later: Unicode, Inc. and others.
2		// License & terms of use: http://www.unicode.org/copyright.html
3		/* ------------------------------------------------------------------ */
4		/* Decimal Context module */
5		/* ------------------------------------------------------------------ */
6		/* Copyright (c) IBM Corporation, 2000-2012. All rights reserved. */
7		/* */
8		/* This software is made available under the terms of the */
9		/* ICU License -- ICU 1.8.1 and later. */
10		/* */
11		/* The description and User's Guide ("The decNumber C Library") for */
12		/* this software is called decNumber.pdf. This document is */
13		/* available, together with arithmetic and format specifications, */
14		/* testcases, and Web links, on the General Decimal Arithmetic page. */
15		/* */
16		/* Please send comments, suggestions, and corrections to the author: */
17		/* mfc@uk.ibm.com */
18		/* Mike Cowlishaw, IBM Fellow */
19		/* IBM UK, PO Box 31, Birmingham Road, Warwick CV34 5JL, UK */
20		/* ------------------------------------------------------------------ */
21		/* This module comprises the routines for handling arithmetic */
22		/* context structures. */
23		/* ------------------------------------------------------------------ */
24
25		#include <string.h> /* for strcmp */
26		#include <stdio.h> /* for printf if DECCHECK */
27		#include "decContext.h" /* context and base types */
28		#include "decNumberLocal.h" /* decNumber local types, etc. */
29
30		#if 0 /* ICU: No need to test endianness at runtime. */
31		/* compile-time endian tester [assumes sizeof(Int)>1] */
32		static const Int mfcone=1; /* constant 1 */
33		static const Flag mfctop=(Flag )&mfcone; /* -> top byte */
34		#define LITEND mfctop / named flag; 1=little-endian */
35		#endif
36
37		/* ------------------------------------------------------------------ */
38		/* decContextClearStatus -- clear bits in current status */
39		/* */
40		/* context is the context structure to be queried */
41		/* mask indicates the bits to be cleared (the status bit that */
42		/* corresponds to each 1 bit in the mask is cleared) */
43		/* returns context */
44		/* */
45		/* No error is possible. */
46		/* ------------------------------------------------------------------ */
47	0	U_CAPI decContext * U_EXPORT2 uprv_decContextClearStatus(decContext *context, uInt mask) {
48	0	context->status&=~mask;
49	0	return context;
50	0	} /* decContextClearStatus */
51
52		/* ------------------------------------------------------------------ */
53		/* decContextDefault -- initialize a context structure */
54		/* */
55		/* context is the structure to be initialized */
56		/* kind selects the required set of default values, one of: */
57		/* DEC_INIT_BASE -- select ANSI X3-274 defaults */
58		/* DEC_INIT_DECIMAL32 -- select IEEE 754 defaults, 32-bit */
59		/* DEC_INIT_DECIMAL64 -- select IEEE 754 defaults, 64-bit */
60		/* DEC_INIT_DECIMAL128 -- select IEEE 754 defaults, 128-bit */
61		/* For any other value a valid context is returned, but with */
62		/* Invalid_operation set in the status field. */
63		/* returns a context structure with the appropriate initial values. */
64		/* ------------------------------------------------------------------ */
65	0	U_CAPI decContext * U_EXPORT2 uprv_decContextDefault(decContext *context, Int kind) {
66		/* set defaults... */
67	0	context->digits=9; /* 9 digits */
68	0	context->emax=DEC_MAX_EMAX; /* 9-digit exponents */
69	0	context->emin=DEC_MIN_EMIN; /* .. balanced */
70	0	context->round=DEC_ROUND_HALF_UP; /* 0.5 rises */
71	0	context->traps=DEC_Errors; /* all but informational */
72	0	context->status=0; /* cleared */
73	0	context->clamp=0; /* no clamping */
74		#if DECSUBSET
75		context->extended=0; /* cleared */
76		#endif
77	0	switch (kind) {
78	0	case DEC_INIT_BASE:
79		/* [use defaults] */
80	0	break;
81	0	case DEC_INIT_DECIMAL32:
82	0	context->digits=7; /* digits */
83	0	context->emax=96; /* Emax */
84	0	context->emin=-95; /* Emin */
85	0	context->round=DEC_ROUND_HALF_EVEN; /* 0.5 to nearest even */
86	0	context->traps=0; /* no traps set */
87	0	context->clamp=1; /* clamp exponents */
88		#if DECSUBSET
89		context->extended=1; /* set */
90		#endif
91	0	break;
92	0	case DEC_INIT_DECIMAL64:
93	0	context->digits=16; /* digits */
94	0	context->emax=384; /* Emax */
95	0	context->emin=-383; /* Emin */
96	0	context->round=DEC_ROUND_HALF_EVEN; /* 0.5 to nearest even */
97	0	context->traps=0; /* no traps set */
98	0	context->clamp=1; /* clamp exponents */
99		#if DECSUBSET
100		context->extended=1; /* set */
101		#endif
102	0	break;
103	0	case DEC_INIT_DECIMAL128:
104	0	context->digits=34; /* digits */
105	0	context->emax=6144; /* Emax */
106	0	context->emin=-6143; /* Emin */
107	0	context->round=DEC_ROUND_HALF_EVEN; /* 0.5 to nearest even */
108	0	context->traps=0; /* no traps set */
109	0	context->clamp=1; /* clamp exponents */
110		#if DECSUBSET
111		context->extended=1; /* set */
112		#endif
113	0	break;
114
115	0	default: /* invalid Kind */
116		/* use defaults, and .. */
117	0	uprv_decContextSetStatus(context, DEC_Invalid_operation); /* trap */
118	0	}
119
120	0	return context;} /* decContextDefault */
121
122		/* ------------------------------------------------------------------ */
123		/* decContextGetRounding -- return current rounding mode */
124		/* */
125		/* context is the context structure to be queried */
126		/* returns the rounding mode */
127		/* */
128		/* No error is possible. */
129		/* ------------------------------------------------------------------ */
130	0	U_CAPI enum rounding U_EXPORT2 uprv_decContextGetRounding(decContext *context) {
131	0	return context->round;
132	0	} /* decContextGetRounding */
133
134		/* ------------------------------------------------------------------ */
135		/* decContextGetStatus -- return current status */
136		/* */
137		/* context is the context structure to be queried */
138		/* returns status */
139		/* */
140		/* No error is possible. */
141		/* ------------------------------------------------------------------ */
142	0	U_CAPI uInt U_EXPORT2 uprv_decContextGetStatus(decContext *context) {
143	0	return context->status;
144	0	} /* decContextGetStatus */
145
146		/* ------------------------------------------------------------------ */
147		/* decContextRestoreStatus -- restore bits in current status */
148		/* */
149		/* context is the context structure to be updated */
150		/* newstatus is the source for the bits to be restored */
151		/* mask indicates the bits to be restored (the status bit that */
152		/* corresponds to each 1 bit in the mask is set to the value of */
153		/* the corresponding bit in newstatus) */
154		/* returns context */
155		/* */
156		/* No error is possible. */
157		/* ------------------------------------------------------------------ */
158		U_CAPI decContext * U_EXPORT2 uprv_decContextRestoreStatus(decContext *context,
159	0	uInt newstatus, uInt mask) {
160	0	context->status&=~mask; /* clear the selected bits */
161	0	context->status\|=(mask&newstatus); /* or in the new bits */
162	0	return context;
163	0	} /* decContextRestoreStatus */
164
165		/* ------------------------------------------------------------------ */
166		/* decContextSaveStatus -- save bits in current status */
167		/* */
168		/* context is the context structure to be queried */
169		/* mask indicates the bits to be saved (the status bits that */
170		/* correspond to each 1 bit in the mask are saved) */
171		/* returns the AND of the mask and the current status */
172		/* */
173		/* No error is possible. */
174		/* ------------------------------------------------------------------ */
175	0	U_CAPI uInt U_EXPORT2 uprv_decContextSaveStatus(decContext *context, uInt mask) {
176	0	return context->status&mask;
177	0	} /* decContextSaveStatus */
178
179		/* ------------------------------------------------------------------ */
180		/* decContextSetRounding -- set current rounding mode */
181		/* */
182		/* context is the context structure to be updated */
183		/* newround is the value which will replace the current mode */
184		/* returns context */
185		/* */
186		/* No error is possible. */
187		/* ------------------------------------------------------------------ */
188		U_CAPI decContext * U_EXPORT2 uprv_decContextSetRounding(decContext *context,
189	0	enum rounding newround) {
190	0	context->round=newround;
191	0	return context;
192	0	} /* decContextSetRounding */
193
194		/* ------------------------------------------------------------------ */
195		/* decContextSetStatus -- set status and raise trap if appropriate */
196		/* */
197		/* context is the context structure to be updated */
198		/* status is the DEC_ exception code */
199		/* returns the context structure */
200		/* */
201		/* Control may never return from this routine, if there is a signal */
202		/* handler and it takes a long jump. */
203		/* ------------------------------------------------------------------ */
204	0	U_CAPI decContext * U_EXPORT2 uprv_decContextSetStatus(decContext *context, uInt status) {
205	0	context->status\|=status;
206		#if 0 /* ICU: Do not raise signals. */
207		if (status & context->traps) raise(SIGFPE);
208		#endif
209	0	return context;} /* decContextSetStatus */
210
211		/* ------------------------------------------------------------------ */
212		/* decContextSetStatusFromString -- set status from a string + trap */
213		/* */
214		/* context is the context structure to be updated */
215		/* string is a string exactly equal to one that might be returned */
216		/* by decContextStatusToString */
217		/* */
218		/* The status bit corresponding to the string is set, and a trap */
219		/* is raised if appropriate. */
220		/* */
221		/* returns the context structure, unless the string is equal to */
222		/* DEC_Condition_MU or is not recognized. In these cases nullptr is */
223		/* returned. */
224		/* ------------------------------------------------------------------ */
225		U_CAPI decContext * U_EXPORT2 uprv_decContextSetStatusFromString(decContext *context,
226	0	const char *string) {
227	0	if (strcmp(string, DEC_Condition_CS)==0)
228	0	return uprv_decContextSetStatus(context, DEC_Conversion_syntax);
229	0	if (strcmp(string, DEC_Condition_DZ)==0)
230	0	return uprv_decContextSetStatus(context, DEC_Division_by_zero);
231	0	if (strcmp(string, DEC_Condition_DI)==0)
232	0	return uprv_decContextSetStatus(context, DEC_Division_impossible);
233	0	if (strcmp(string, DEC_Condition_DU)==0)
234	0	return uprv_decContextSetStatus(context, DEC_Division_undefined);
235	0	if (strcmp(string, DEC_Condition_IE)==0)
236	0	return uprv_decContextSetStatus(context, DEC_Inexact);
237	0	if (strcmp(string, DEC_Condition_IS)==0)
238	0	return uprv_decContextSetStatus(context, DEC_Insufficient_storage);
239	0	if (strcmp(string, DEC_Condition_IC)==0)
240	0	return uprv_decContextSetStatus(context, DEC_Invalid_context);
241	0	if (strcmp(string, DEC_Condition_IO)==0)
242	0	return uprv_decContextSetStatus(context, DEC_Invalid_operation);
243		#if DECSUBSET
244		if (strcmp(string, DEC_Condition_LD)==0)
245		return uprv_decContextSetStatus(context, DEC_Lost_digits);
246		#endif
247	0	if (strcmp(string, DEC_Condition_OV)==0)
248	0	return uprv_decContextSetStatus(context, DEC_Overflow);
249	0	if (strcmp(string, DEC_Condition_PA)==0)
250	0	return uprv_decContextSetStatus(context, DEC_Clamped);
251	0	if (strcmp(string, DEC_Condition_RO)==0)
252	0	return uprv_decContextSetStatus(context, DEC_Rounded);
253	0	if (strcmp(string, DEC_Condition_SU)==0)
254	0	return uprv_decContextSetStatus(context, DEC_Subnormal);
255	0	if (strcmp(string, DEC_Condition_UN)==0)
256	0	return uprv_decContextSetStatus(context, DEC_Underflow);
257	0	if (strcmp(string, DEC_Condition_ZE)==0)
258	0	return context;
259	0	return nullptr; /* Multiple status, or unknown */
260	0	} /* decContextSetStatusFromString */
261
262		/* ------------------------------------------------------------------ */
263		/* decContextSetStatusFromStringQuiet -- set status from a string */
264		/* */
265		/* context is the context structure to be updated */
266		/* string is a string exactly equal to one that might be returned */
267		/* by decContextStatusToString */
268		/* */
269		/* The status bit corresponding to the string is set; no trap is */
270		/* raised. */
271		/* */
272		/* returns the context structure, unless the string is equal to */
273		/* DEC_Condition_MU or is not recognized. In these cases nullptr is */
274		/* returned. */
275		/* ------------------------------------------------------------------ */
276		U_CAPI decContext * U_EXPORT2 uprv_decContextSetStatusFromStringQuiet(decContext *context,
277	0	const char *string) {
278	0	if (strcmp(string, DEC_Condition_CS)==0)
279	0	return uprv_decContextSetStatusQuiet(context, DEC_Conversion_syntax);
280	0	if (strcmp(string, DEC_Condition_DZ)==0)
281	0	return uprv_decContextSetStatusQuiet(context, DEC_Division_by_zero);
282	0	if (strcmp(string, DEC_Condition_DI)==0)
283	0	return uprv_decContextSetStatusQuiet(context, DEC_Division_impossible);
284	0	if (strcmp(string, DEC_Condition_DU)==0)
285	0	return uprv_decContextSetStatusQuiet(context, DEC_Division_undefined);
286	0	if (strcmp(string, DEC_Condition_IE)==0)
287	0	return uprv_decContextSetStatusQuiet(context, DEC_Inexact);
288	0	if (strcmp(string, DEC_Condition_IS)==0)
289	0	return uprv_decContextSetStatusQuiet(context, DEC_Insufficient_storage);
290	0	if (strcmp(string, DEC_Condition_IC)==0)
291	0	return uprv_decContextSetStatusQuiet(context, DEC_Invalid_context);
292	0	if (strcmp(string, DEC_Condition_IO)==0)
293	0	return uprv_decContextSetStatusQuiet(context, DEC_Invalid_operation);
294		#if DECSUBSET
295		if (strcmp(string, DEC_Condition_LD)==0)
296		return uprv_decContextSetStatusQuiet(context, DEC_Lost_digits);
297		#endif
298	0	if (strcmp(string, DEC_Condition_OV)==0)
299	0	return uprv_decContextSetStatusQuiet(context, DEC_Overflow);
300	0	if (strcmp(string, DEC_Condition_PA)==0)
301	0	return uprv_decContextSetStatusQuiet(context, DEC_Clamped);
302	0	if (strcmp(string, DEC_Condition_RO)==0)
303	0	return uprv_decContextSetStatusQuiet(context, DEC_Rounded);
304	0	if (strcmp(string, DEC_Condition_SU)==0)
305	0	return uprv_decContextSetStatusQuiet(context, DEC_Subnormal);
306	0	if (strcmp(string, DEC_Condition_UN)==0)
307	0	return uprv_decContextSetStatusQuiet(context, DEC_Underflow);
308	0	if (strcmp(string, DEC_Condition_ZE)==0)
309	0	return context;
310	0	return nullptr; /* Multiple status, or unknown */
311	0	} /* decContextSetStatusFromStringQuiet */
312
313		/* ------------------------------------------------------------------ */
314		/* decContextSetStatusQuiet -- set status without trap */
315		/* */
316		/* context is the context structure to be updated */
317		/* status is the DEC_ exception code */
318		/* returns the context structure */
319		/* */
320		/* No error is possible. */
321		/* ------------------------------------------------------------------ */
322	0	U_CAPI decContext * U_EXPORT2 uprv_decContextSetStatusQuiet(decContext *context, uInt status) {
323	0	context->status\|=status;
324	0	return context;} /* decContextSetStatusQuiet */
325
326		/* ------------------------------------------------------------------ */
327		/* decContextStatusToString -- convert status flags to a string */
328		/* */
329		/* context is a context with valid status field */
330		/* */
331		/* returns a constant string describing the condition. If multiple */
332		/* (or no) flags are set, a generic constant message is returned. */
333		/* ------------------------------------------------------------------ */
334	0	U_CAPI const char * U_EXPORT2 uprv_decContextStatusToString(const decContext *context) {
335	0	Int status=context->status;
336
337		/* test the five IEEE first, as some of the others are ambiguous when */
338		/* DECEXTFLAG=0 */
339	0	if (status==DEC_Invalid_operation ) return DEC_Condition_IO;
340	0	if (status==DEC_Division_by_zero ) return DEC_Condition_DZ;
341	0	if (status==DEC_Overflow ) return DEC_Condition_OV;
342	0	if (status==DEC_Underflow ) return DEC_Condition_UN;
343	0	if (status==DEC_Inexact ) return DEC_Condition_IE;
344
345	0	if (status==DEC_Division_impossible ) return DEC_Condition_DI;
346	0	if (status==DEC_Division_undefined ) return DEC_Condition_DU;
347	0	if (status==DEC_Rounded ) return DEC_Condition_RO;
348	0	if (status==DEC_Clamped ) return DEC_Condition_PA;
349	0	if (status==DEC_Subnormal ) return DEC_Condition_SU;
350	0	if (status==DEC_Conversion_syntax ) return DEC_Condition_CS;
351	0	if (status==DEC_Insufficient_storage ) return DEC_Condition_IS;
352	0	if (status==DEC_Invalid_context ) return DEC_Condition_IC;
353		#if DECSUBSET
354		if (status==DEC_Lost_digits ) return DEC_Condition_LD;
355		#endif
356	0	if (status==0 ) return DEC_Condition_ZE;
357	0	return DEC_Condition_MU; /* Multiple errors */
358	0	} /* decContextStatusToString */
359
360		/* ------------------------------------------------------------------ */
361		/* decContextTestEndian -- test whether DECLITEND is set correctly */
362		/* */
363		/* quiet is 1 to suppress message; 0 otherwise */
364		/* returns 0 if DECLITEND is correct */
365		/* 1 if DECLITEND is incorrect and should be 1 */
366		/* -1 if DECLITEND is incorrect and should be 0 */
367		/* */
368		/* A message is displayed if the return value is not 0 and quiet==0. */
369		/* */
370		/* No error is possible. */
371		/* ------------------------------------------------------------------ */
372		#if 0 /* ICU: Unused function. Anyway, do not call printf(). */
373		U_CAPI Int U_EXPORT2 uprv_decContextTestEndian(Flag quiet) {
374		Int res=0; /* optimist */
375		uInt dle=(uInt)DECLITEND; /* unsign */
376		if (dle>1) dle=1; /* ensure 0 or 1 */
377
378		if (LITEND!=DECLITEND) {
379		const char *adj;
380		if (!quiet) {
381		if (LITEND) adj="little";
382		else adj="big";
383		printf("Warning: DECLITEND is set to %d, but this computer appears to be %s-endian\n",
384		DECLITEND, adj);
385		}
386		res=(Int)LITEND-dle;
387		}
388		return res;
389		} /* decContextTestEndian */
390		#endif
391
392		/* ------------------------------------------------------------------ */
393		/* decContextTestSavedStatus -- test bits in saved status */
394		/* */
395		/* oldstatus is the status word to be tested */
396		/* mask indicates the bits to be tested (the oldstatus bits that */
397		/* correspond to each 1 bit in the mask are tested) */
398		/* returns 1 if any of the tested bits are 1, or 0 otherwise */
399		/* */
400		/* No error is possible. */
401		/* ------------------------------------------------------------------ */
402	0	U_CAPI uInt U_EXPORT2 uprv_decContextTestSavedStatus(uInt oldstatus, uInt mask) {
403	0	return (oldstatus&mask)!=0;
404	0	} /* decContextTestSavedStatus */
405
406		/* ------------------------------------------------------------------ */
407		/* decContextTestStatus -- test bits in current status */
408		/* */
409		/* context is the context structure to be updated */
410		/* mask indicates the bits to be tested (the status bits that */
411		/* correspond to each 1 bit in the mask are tested) */
412		/* returns 1 if any of the tested bits are 1, or 0 otherwise */
413		/* */
414		/* No error is possible. */
415		/* ------------------------------------------------------------------ */
416	0	U_CAPI uInt U_EXPORT2 uprv_decContextTestStatus(decContext *context, uInt mask) {
417	0	return (context->status&mask)!=0;
418	0	} /* decContextTestStatus */
419
420		/* ------------------------------------------------------------------ */
421		/* decContextZeroStatus -- clear all status bits */
422		/* */
423		/* context is the context structure to be updated */
424		/* returns context */
425		/* */
426		/* No error is possible. */
427		/* ------------------------------------------------------------------ */
428	0	U_CAPI decContext * U_EXPORT2 uprv_decContextZeroStatus(decContext *context) {
429	0	context->status=0;
430	0	return context;
431	0	} /* decContextZeroStatus */
432