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icu46/source/i18n/decContext.c

Index: icu46/source/i18n/decContext.c
===================================================================
--- icu46/source/i18n/decContext.c	(revision 0)
+++ icu46/source/i18n/decContext.c	(revision 0)
@@ -0,0 +1,435 @@
+/* ------------------------------------------------------------------ */
+/* Decimal Context module                                             */
+/* ------------------------------------------------------------------ */
+/* Copyright (c) IBM Corporation, 2000-2010.  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.  */
+
+/* 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  */
+
+/* ------------------------------------------------------------------ */
+/* round-for-reround digits                                           */
+/* ------------------------------------------------------------------ */
+const uByte DECSTICKYTAB[10]={1,1,2,3,4,6,6,7,8,9}; /* used if sticky */
+
+/* ------------------------------------------------------------------ */
+/* Powers of ten (powers[n]==10**n, 0<=n<=9)                          */
+/* ------------------------------------------------------------------ */
+const uInt DECPOWERS[10]={1, 10, 100, 1000, 10000, 100000, 1000000,
+                          10000000, 100000000, 1000000000};
+
+/* ------------------------------------------------------------------ */
+/* 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 correspnding 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 (status & context->traps) raise(SIGFPE);
+  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 NULL 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 NULL;  /* 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 NULL 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 NULL;  /* 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.                                              */
+/* ------------------------------------------------------------------ */
+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  */
+
+/* ------------------------------------------------------------------ */
+/* 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  */
+
Property changes on: icu46/source/i18n/decContext.c
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