[thirdparty/gcc.git] / libdecnumber / dpd / decimal128.c

/* Decimal 128-bit format module from the decNumber C Library.
   Copyright (C) 2005 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 2, or (at your option) any later
   version.

   In addition to the permissions in the GNU General Public License,
   the Free Software Foundation gives you unlimited permission to link
   the compiled version of this file into combinations with other
   programs, and to distribute those combinations without any
   restriction coming from the use of this file.  (The General Public
   License restrictions do apply in other respects; for example, they
   cover modification of the file, and distribution when not linked
   into a combine executable.)

   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.

   You should have received a copy of the GNU General Public License
   along with GCC; see the file COPYING.  If not, write to the Free
   Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301, USA.  */

/* ------------------------------------------------------------------ */
/* This module comprises the routines for decimal128 format numbers.  */
/* Conversions are supplied to and from decNumber and String.         */
/*                                                                    */
/* No arithmetic routines are included; decNumber provides these.     */
/*                                                                    */
/* Error handling is the same as decNumber (qv.).                     */
/* ------------------------------------------------------------------ */
#include <string.h>		/* [for memset/memcpy] */
#include <stdio.h>		/* [for printf] */

#define  DECNUMDIGITS 34	/* we need decNumbers with space for 34 */
#include "config.h"
#include "decNumber.h"		/* base number library */
#include "decNumberLocal.h"	/* decNumber local types, etc. */
#include "decimal128.h"		/* our primary include */
#include "decUtility.h"		/* utility routines */

#if DECTRACE || DECCHECK
void decimal128Show (const decimal128 *);	/* for debug */
void decNumberShow (const decNumber *);	/* .. */
#endif

/* Useful macro */
/* Clear a structure (e.g., a decNumber) */
#define DEC_clear(d) memset(d, 0, sizeof(*d))

/* ------------------------------------------------------------------ */
/* decimal128FromNumber -- convert decNumber to decimal128            */
/*                                                                    */
/*   ds is the target decimal128                                      */
/*   dn is the source number (assumed valid)                          */
/*   set is the context, used only for reporting errors               */
/*                                                                    */
/* The set argument is used only for status reporting and for the     */
/* rounding mode (used if the coefficient is more than DECIMAL128_Pmax*/
/* digits or an overflow is detected).  If the exponent is out of the */
/* valid range then Overflow or Underflow will be raised.             */
/* After Underflow a subnormal result is possible.                    */
/*                                                                    */
/* DEC_Clamped is set if the number has to be 'folded down' to fit,   */
/* by reducing its exponent and multiplying the coefficient by a      */
/* power of ten, or if the exponent on a zero had to be clamped.      */
/* ------------------------------------------------------------------ */
decimal128 *
decimal128FromNumber (decimal128 * d128, const decNumber * dn, decContext * set)
{
  uInt status = 0;		/* status accumulator */
  Int pad = 0;			/* coefficient pad digits */
  decNumber dw;			/* work */
  decContext dc;		/* .. */
  uByte isneg = dn->bits & DECNEG;	/* non-0 if original sign set */
  uInt comb, exp;		/* work */

  /* If the number is finite, and has too many digits, or the exponent */
  /* could be out of range then we reduce the number under the */
  /* appropriate constraints */
  if (!(dn->bits & DECSPECIAL))
    {				/* not a special value */
      Int ae = dn->exponent + dn->digits - 1;	/* adjusted exponent */
      if (dn->digits > DECIMAL128_Pmax	/* too many digits */
	  || ae > DECIMAL128_Emax	/* likely overflow */
	  || ae < DECIMAL128_Emin)
	{			/* likely underflow */
	  decContextDefault (&dc, DEC_INIT_DECIMAL128);	/* [no traps] */
	  dc.round = set->round;	/* use supplied rounding */
	  decNumberPlus (&dw, dn, &dc);	/* (round and check) */
	  /* [this changes -0 to 0, but it will be restored below] */
	  status |= dc.status;	/* save status */
	  dn = &dw;		/* use the work number */
	}
      /* [this could have pushed number to Infinity or zero, so this */
      /* rounding must be done before we generate the decimal128] */
    }

  DEC_clear (d128);		/* clean the target */
  if (dn->bits & DECSPECIAL)
    {				/* a special value */
      uByte top;		/* work */
      if (dn->bits & DECINF)
	top = DECIMAL_Inf;
      else
	{			/* sNaN or qNaN */
	  if ((*dn->lsu != 0 || dn->digits > 1)	/* non-zero coefficient */
	      && (dn->digits < DECIMAL128_Pmax))
	    {			/* coefficient fits */
	      decDensePackCoeff (dn, d128->bytes, sizeof (d128->bytes), 0);
	    }
	  if (dn->bits & DECNAN)
	    top = DECIMAL_NaN;
	  else
	    top = DECIMAL_sNaN;
	}
      d128->bytes[0] = top;
    }
  else if (decNumberIsZero (dn))
    {				/* a zero */
      /* set and clamp exponent */
      if (dn->exponent < -DECIMAL128_Bias)
	{
	  exp = 0;
	  status |= DEC_Clamped;
	}
      else
	{
	  exp = dn->exponent + DECIMAL128_Bias;	/* bias exponent */
	  if (exp > DECIMAL128_Ehigh)
	    {			/* top clamp */
	      exp = DECIMAL128_Ehigh;
	      status |= DEC_Clamped;
	    }
	}
      comb = (exp >> 9) & 0x18;	/* combination field */
      d128->bytes[0] = (uByte) (comb << 2);
      exp &= 0xfff;		/* remaining exponent bits */
      decimal128SetExpCon (d128, exp);
    }
  else
    {				/* non-zero finite number */
      uInt msd;			/* work */

      /* we have a dn that fits, but it may need to be padded */
      exp = (uInt) (dn->exponent + DECIMAL128_Bias);	/* bias exponent */

      if (exp > DECIMAL128_Ehigh)
	{			/* fold-down case */
	  pad = exp - DECIMAL128_Ehigh;
	  exp = DECIMAL128_Ehigh;	/* [to maximum] */
	  status |= DEC_Clamped;
	}

      decDensePackCoeff (dn, d128->bytes, sizeof (d128->bytes), pad);

      /* save and clear the top digit */
      msd = ((unsigned) d128->bytes[1] << 2) & 0x0c;	/* top 2 bits */
      msd |= ((unsigned) d128->bytes[2] >> 6);	/* low 2 bits */
      d128->bytes[1] &= 0xfc;
      d128->bytes[2] &= 0x3f;

      /* create the combination field */
      if (msd >= 8)
	comb = 0x18 | (msd & 0x01) | ((exp >> 11) & 0x06);
      else
	comb = (msd & 0x07) | ((exp >> 9) & 0x18);
      d128->bytes[0] = (uByte) (comb << 2);
      exp &= 0xfff;		/* remaining exponent bits */
      decimal128SetExpCon (d128, exp);
    }

  if (isneg)
    decimal128SetSign (d128, 1);
  if (status != 0)
    decContextSetStatus (set, status);	/* pass on status */

  /* decimal128Show(d128); */
  return d128;
}

/* ------------------------------------------------------------------ */
/* decimal128ToNumber -- convert decimal128 to decNumber              */
/*   d128 is the source decimal128                                    */
/*   dn is the target number, with appropriate space                  */
/* No error is possible.                                              */
/* ------------------------------------------------------------------ */
decNumber *
decimal128ToNumber (const decimal128 * d128, decNumber * dn)
{
  uInt msd;			/* coefficient MSD */
  decimal128 wk;		/* working copy, if needed */
  uInt top = d128->bytes[0] & 0x7f;	/* top byte, less sign bit */
  decNumberZero (dn);		/* clean target */
  /* set the sign if negative */
  if (decimal128Sign (d128))
    dn->bits = DECNEG;

  if (top >= 0x78)
    {				/* is a special */
      if ((top & 0x7c) == (DECIMAL_Inf & 0x7c))
	dn->bits |= DECINF;
      else if ((top & 0x7e) == (DECIMAL_NaN & 0x7e))
	dn->bits |= DECNAN;
      else
	dn->bits |= DECSNAN;
      msd = 0;			/* no top digit */
    }
  else
    {				/* have a finite number */
      uInt comb = top >> 2;	/* combination field */
      uInt exp;			/* exponent */

      if (comb >= 0x18)
	{
	  msd = 8 + (comb & 0x01);
	  exp = (comb & 0x06) << 11;	/* MSBs */
	}
      else
	{
	  msd = comb & 0x07;
	  exp = (comb & 0x18) << 9;
	}
      dn->exponent = exp + decimal128ExpCon (d128) - DECIMAL128_Bias;	/* remove bias */
    }

  /* get the coefficient, unless infinite */
  if (!(dn->bits & DECINF))
    {
      Int bunches = DECIMAL128_Pmax / 3;	/* coefficient full bunches to convert */
      Int odd = 0;		/* assume MSD is 0 (no odd bunch) */
      if (msd != 0)
	{			/* coefficient has leading non-0 digit */
	  /* make a copy of the decimal128, with an extra bunch which has */
	  /* the top digit ready for conversion */
	  wk = *d128;		/* take a copy */
	  wk.bytes[0] = 0;	/* clear all but coecon */
	  wk.bytes[1] = 0;	/* .. */
	  wk.bytes[2] &= 0x3f;	/* .. */
	  wk.bytes[1] |= (msd >> 2);	/* and prefix MSD */
	  wk.bytes[2] |= (msd << 6);	/* .. */
	  odd++;		/* indicate the extra */
	  d128 = &wk;		/* use the work copy */
	}
      decDenseUnpackCoeff (d128->bytes, sizeof (d128->bytes), dn, bunches,
			   odd);
    }

  /* decNumberShow(dn); */
  return dn;
}

/* ------------------------------------------------------------------ */
/* to-scientific-string -- conversion to numeric string               */
/* to-engineering-string -- conversion to numeric string              */
/*                                                                    */
/*   decimal128ToString(d128, string);                                */
/*   decimal128ToEngString(d128, string);                             */
/*                                                                    */
/*  d128 is the decimal128 format number to convert                   */
/*  string is the string where the result will be laid out            */
/*                                                                    */
/*  string must be at least 24 characters                             */
/*                                                                    */
/*  No error is possible, and no status can be set.                   */
/* ------------------------------------------------------------------ */
char *
decimal128ToString (const decimal128 * d128, char *string)
{
  decNumber dn;			/* work */
  decimal128ToNumber (d128, &dn);
  decNumberToString (&dn, string);
  return string;
}

char *
decimal128ToEngString (const decimal128 * d128, char *string)
{
  decNumber dn;			/* work */
  decimal128ToNumber (d128, &dn);
  decNumberToEngString (&dn, string);
  return string;
}

/* ------------------------------------------------------------------ */
/* to-number -- conversion from numeric string                        */
/*                                                                    */
/*   decimal128FromString(result, string, set);                       */
/*                                                                    */
/*  result  is the decimal128 format number which gets the result of  */
/*          the conversion                                            */
/*  *string is the character string which should contain a valid      */
/*          number (which may be a special value)                     */
/*  set     is the context                                            */
/*                                                                    */
/* The context is supplied to this routine is used for error handling */
/* (setting of status and traps) and for the rounding mode, only.     */
/* If an error occurs, the result will be a valid decimal128 NaN.     */
/* ------------------------------------------------------------------ */
decimal128 *
decimal128FromString (decimal128 * result, const char *string, decContext * set)
{
  decContext dc;		/* work */
  decNumber dn;			/* .. */

  decContextDefault (&dc, DEC_INIT_DECIMAL128);	/* no traps, please */
  dc.round = set->round;	/* use supplied rounding */

  decNumberFromString (&dn, string, &dc);	/* will round if needed */
  decimal128FromNumber (result, &dn, &dc);
  if (dc.status != 0)
    {				/* something happened */
      decContextSetStatus (set, dc.status);	/* .. pass it on */
    }
  return result;
}


#if DECTRACE || DECCHECK
/* ------------------------------------------------------------------ */
/* decimal128Show -- display a single in hexadecimal [debug aid]      */
/*   d128 -- the number to show                                       */
/* ------------------------------------------------------------------ */
/* Also shows sign/cob/expconfields extracted */
void
decimal128Show (const decimal128 * d128)
{
  char buf[DECIMAL128_Bytes * 2 + 1];
  Int i, j;
  j = 0;
  for (i = 0; i < DECIMAL128_Bytes; i++)
    {
      sprintf (&buf[j], "%02x", d128->bytes[i]);
      j = j + 2;
    }
  printf (" D128> %s [S:%d Cb:%02x E:%d]\n", buf,
	  decimal128Sign (d128), decimal128Comb (d128),
	  decimal128ExpCon (d128));
}
#endif
Commit	Line	Data
473a74b9 BE	1	/* Decimal 128-bit format module from the decNumber C Library.
	2	Copyright (C) 2005 Free Software Foundation, Inc.
	3	Contributed by IBM Corporation. Author Mike Cowlishaw.
	4
	5	This file is part of GCC.
	6
	7	GCC is free software; you can redistribute it and/or modify it under
	8	the terms of the GNU General Public License as published by the Free
	9	Software Foundation; either version 2, or (at your option) any later
	10	version.
	11
9d1d1cd4 BE	12	In addition to the permissions in the GNU General Public License,
	13	the Free Software Foundation gives you unlimited permission to link
	14	the compiled version of this file into combinations with other
	15	programs, and to distribute those combinations without any
	16	restriction coming from the use of this file. (The General Public
	17	License restrictions do apply in other respects; for example, they
	18	cover modification of the file, and distribution when not linked
	19	into a combine executable.)
	20
473a74b9 BE	21	GCC is distributed in the hope that it will be useful, but WITHOUT ANY
	22	WARRANTY; without even the implied warranty of MERCHANTABILITY or
	23	FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	24	for more details.
	25
	26	You should have received a copy of the GNU General Public License
	27	along with GCC; see the file COPYING. If not, write to the Free
c0173136 BE	28	Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
c0173136 BE	29	02110-1301, USA. */
473a74b9 BE	30
	31	/* ------------------------------------------------------------------ */
	32	/* This module comprises the routines for decimal128 format numbers. */
	33	/* Conversions are supplied to and from decNumber and String. */
	34	/* */
	35	/* No arithmetic routines are included; decNumber provides these. */
	36	/* */
	37	/* Error handling is the same as decNumber (qv.). */
	38	/* ------------------------------------------------------------------ */
	39	#include <string.h> /* [for memset/memcpy] */
	40	#include <stdio.h> /* [for printf] */
	41
	42	#define DECNUMDIGITS 34 /* we need decNumbers with space for 34 */
da817a2f	43	#include "config.h"
473a74b9 BE	44	#include "decNumber.h" /* base number library */
	45	#include "decNumberLocal.h" /* decNumber local types, etc. */
	46	#include "decimal128.h" /* our primary include */
	47	#include "decUtility.h" /* utility routines */
	48
	49	#if DECTRACE \|\| DECCHECK
aa4f41c1 KG	50	void decimal128Show (const decimal128 ); / for debug */
aa4f41c1 KG	51	void decNumberShow (const decNumber ); / .. */
473a74b9 BE	52	#endif
	53
	54	/* Useful macro */
	55	/* Clear a structure (e.g., a decNumber) */
	56	#define DEC_clear(d) memset(d, 0, sizeof(*d))
	57
	58	/* ------------------------------------------------------------------ */
	59	/* decimal128FromNumber -- convert decNumber to decimal128 */
	60	/* */
	61	/* ds is the target decimal128 */
	62	/* dn is the source number (assumed valid) */
	63	/* set is the context, used only for reporting errors */
	64	/* */
	65	/* The set argument is used only for status reporting and for the */
	66	/* rounding mode (used if the coefficient is more than DECIMAL128_Pmax*/
	67	/* digits or an overflow is detected). If the exponent is out of the */
	68	/* valid range then Overflow or Underflow will be raised. */
	69	/* After Underflow a subnormal result is possible. */
	70	/* */
	71	/* DEC_Clamped is set if the number has to be 'folded down' to fit, */
	72	/* by reducing its exponent and multiplying the coefficient by a */
	73	/* power of ten, or if the exponent on a zero had to be clamped. */
	74	/* ------------------------------------------------------------------ */
	75	decimal128 *
aa4f41c1	76	decimal128FromNumber (decimal128 * d128, const decNumber * dn, decContext * set)
473a74b9 BE	77	{
	78	uInt status = 0; /* status accumulator */
	79	Int pad = 0; /* coefficient pad digits */
	80	decNumber dw; /* work */
	81	decContext dc; /* .. */
	82	uByte isneg = dn->bits & DECNEG; /* non-0 if original sign set */
	83	uInt comb, exp; /* work */
	84
	85	/* If the number is finite, and has too many digits, or the exponent */
	86	/* could be out of range then we reduce the number under the */
	87	/* appropriate constraints */
	88	if (!(dn->bits & DECSPECIAL))
	89	{ /* not a special value */
	90	Int ae = dn->exponent + dn->digits - 1; /* adjusted exponent */
	91	if (dn->digits > DECIMAL128_Pmax /* too many digits */
	92	\|\| ae > DECIMAL128_Emax /* likely overflow */
	93	\|\| ae < DECIMAL128_Emin)
	94	{ /* likely underflow */
	95	decContextDefault (&dc, DEC_INIT_DECIMAL128); /* [no traps] */
	96	dc.round = set->round; /* use supplied rounding */
	97	decNumberPlus (&dw, dn, &dc); /* (round and check) */
	98	/* [this changes -0 to 0, but it will be restored below] */
	99	status \|= dc.status; /* save status */
	100	dn = &dw; /* use the work number */
	101	}
	102	/* [this could have pushed number to Infinity or zero, so this */
	103	/* rounding must be done before we generate the decimal128] */
	104	}
	105
	106	DEC_clear (d128); /* clean the target */
	107	if (dn->bits & DECSPECIAL)
	108	{ /* a special value */
	109	uByte top; /* work */
	110	if (dn->bits & DECINF)
	111	top = DECIMAL_Inf;
	112	else
	113	{ /* sNaN or qNaN */
	114	if ((dn->lsu != 0 \|\| dn->digits > 1) / non-zero coefficient */
	115	&& (dn->digits < DECIMAL128_Pmax))
	116	{ /* coefficient fits */
	117	decDensePackCoeff (dn, d128->bytes, sizeof (d128->bytes), 0);
	118	}
	119	if (dn->bits & DECNAN)
	120	top = DECIMAL_NaN;
	121	else
	122	top = DECIMAL_sNaN;
	123	}
	124	d128->bytes[0] = top;
	125	}
	126	else if (decNumberIsZero (dn))
	127	{ /* a zero */
	128	/* set and clamp exponent */
	129	if (dn->exponent < -DECIMAL128_Bias)
	130	{
	131	exp = 0;
	132	status \|= DEC_Clamped;
	133	}
	134	else
	135	{
	136	exp = dn->exponent + DECIMAL128_Bias; /* bias exponent */
	137	if (exp > DECIMAL128_Ehigh)
	138	{ /* top clamp */
	139	exp = DECIMAL128_Ehigh;
	140	status \|= DEC_Clamped;
141	}
142	}
143	comb = (exp >> 9) & 0x18; /* combination field */
144	d128->bytes[0] = (uByte) (comb << 2);
145	exp &= 0xfff; /* remaining exponent bits */
146	decimal128SetExpCon (d128, exp);
147	}
148	else
149	{ /* non-zero finite number */
150	uInt msd; /* work */
151
152	/* we have a dn that fits, but it may need to be padded */
153	exp = (uInt) (dn->exponent + DECIMAL128_Bias); /* bias exponent */
154
155	if (exp > DECIMAL128_Ehigh)
156	{ /* fold-down case */
157	pad = exp - DECIMAL128_Ehigh;
158	exp = DECIMAL128_Ehigh; /* [to maximum] */
159	status \|= DEC_Clamped;
160	}
161
162	decDensePackCoeff (dn, d128->bytes, sizeof (d128->bytes), pad);
163
164	/* save and clear the top digit */
165	msd = ((unsigned) d128->bytes[1] << 2) & 0x0c; /* top 2 bits */
166	msd \|= ((unsigned) d128->bytes[2] >> 6); /* low 2 bits */
167	d128->bytes[1] &= 0xfc;
168	d128->bytes[2] &= 0x3f;
169
170	/* create the combination field */
171	if (msd >= 8)
172	comb = 0x18 \| (msd & 0x01) \| ((exp >> 11) & 0x06);
173	else
174	comb = (msd & 0x07) \| ((exp >> 9) & 0x18);
175	d128->bytes[0] = (uByte) (comb << 2);
176	exp &= 0xfff; /* remaining exponent bits */
177	decimal128SetExpCon (d128, exp);
178	}
179
180	if (isneg)
181	decimal128SetSign (d128, 1);
182	if (status != 0)
183	decContextSetStatus (set, status); /* pass on status */
184
185	/* decimal128Show(d128); */
186	return d128;
187	}
188
189	/* ------------------------------------------------------------------ */
190	/* decimal128ToNumber -- convert decimal128 to decNumber */
191	/* d128 is the source decimal128 */
192	/* dn is the target number, with appropriate space */
193	/* No error is possible. */
194	/* ------------------------------------------------------------------ */
195	decNumber *
aa4f41c1	196	decimal128ToNumber (const decimal128 * d128, decNumber * dn)
473a74b9 BE	197	{
	198	uInt msd; /* coefficient MSD */
	199	decimal128 wk; /* working copy, if needed */
	200	uInt top = d128->bytes[0] & 0x7f; /* top byte, less sign bit */
	201	decNumberZero (dn); /* clean target */
	202	/* set the sign if negative */
	203	if (decimal128Sign (d128))
	204	dn->bits = DECNEG;
	205
	206	if (top >= 0x78)
	207	{ /* is a special */
	208	if ((top & 0x7c) == (DECIMAL_Inf & 0x7c))
	209	dn->bits \|= DECINF;
	210	else if ((top & 0x7e) == (DECIMAL_NaN & 0x7e))
	211	dn->bits \|= DECNAN;
	212	else
	213	dn->bits \|= DECSNAN;
	214	msd = 0; /* no top digit */
	215	}
	216	else
	217	{ /* have a finite number */
	218	uInt comb = top >> 2; /* combination field */
	219	uInt exp; /* exponent */
	220
	221	if (comb >= 0x18)
	222	{
	223	msd = 8 + (comb & 0x01);
	224	exp = (comb & 0x06) << 11; /* MSBs */
	225	}
	226	else
	227	{
	228	msd = comb & 0x07;
	229	exp = (comb & 0x18) << 9;
	230	}
	231	dn->exponent = exp + decimal128ExpCon (d128) - DECIMAL128_Bias; /* remove bias */
	232	}
	233
	234	/* get the coefficient, unless infinite */
	235	if (!(dn->bits & DECINF))
	236	{
	237	Int bunches = DECIMAL128_Pmax / 3; /* coefficient full bunches to convert */
	238	Int odd = 0; /* assume MSD is 0 (no odd bunch) */
	239	if (msd != 0)
	240	{ /* coefficient has leading non-0 digit */
	241	/* make a copy of the decimal128, with an extra bunch which has */
	242	/* the top digit ready for conversion */
	243	wk = d128; / take a copy */
	244	wk.bytes[0] = 0; /* clear all but coecon */
	245	wk.bytes[1] = 0; /* .. */
	246	wk.bytes[2] &= 0x3f; /* .. */
	247	wk.bytes[1] \|= (msd >> 2); /* and prefix MSD */
	248	wk.bytes[2] \|= (msd << 6); /* .. */
	249	odd++; /* indicate the extra */
	250	d128 = &wk; /* use the work copy */
	251	}
	252	decDenseUnpackCoeff (d128->bytes, sizeof (d128->bytes), dn, bunches,
	253	odd);
	254	}
	255
	256	/* decNumberShow(dn); */
	257	return dn;
	258	}
	259
	260	/* ------------------------------------------------------------------ */
261	/* to-scientific-string -- conversion to numeric string */
262	/* to-engineering-string -- conversion to numeric string */
263	/* */
264	/* decimal128ToString(d128, string); */
265	/* decimal128ToEngString(d128, string); */
266	/* */
267	/* d128 is the decimal128 format number to convert */
268	/* string is the string where the result will be laid out */
269	/* */
270	/* string must be at least 24 characters */
271	/* */
272	/* No error is possible, and no status can be set. */
273	/* ------------------------------------------------------------------ */
274	char *
aa4f41c1	275	decimal128ToString (const decimal128 * d128, char *string)
473a74b9 BE	276	{
	277	decNumber dn; /* work */
	278	decimal128ToNumber (d128, &dn);
	279	decNumberToString (&dn, string);
	280	return string;
	281	}
	282
	283	char *
aa4f41c1	284	decimal128ToEngString (const decimal128 * d128, char *string)
473a74b9 BE	285	{
	286	decNumber dn; /* work */
	287	decimal128ToNumber (d128, &dn);
	288	decNumberToEngString (&dn, string);
	289	return string;
	290	}
	291
	292	/* ------------------------------------------------------------------ */
	293	/* to-number -- conversion from numeric string */
	294	/* */
	295	/* decimal128FromString(result, string, set); */
	296	/* */
	297	/* result is the decimal128 format number which gets the result of */
	298	/* the conversion */
	299	/* string is the character string which should contain a valid /
	300	/* number (which may be a special value) */
	301	/* set is the context */
	302	/* */
	303	/* The context is supplied to this routine is used for error handling */
	304	/* (setting of status and traps) and for the rounding mode, only. */
	305	/* If an error occurs, the result will be a valid decimal128 NaN. */
	306	/* ------------------------------------------------------------------ */
	307	decimal128 *
c5d43417	308	decimal128FromString (decimal128 * result, const char string, decContext set)
473a74b9 BE	309	{
	310	decContext dc; /* work */
	311	decNumber dn; /* .. */
	312
	313	decContextDefault (&dc, DEC_INIT_DECIMAL128); /* no traps, please */
	314	dc.round = set->round; /* use supplied rounding */
	315
	316	decNumberFromString (&dn, string, &dc); /* will round if needed */
	317	decimal128FromNumber (result, &dn, &dc);
	318	if (dc.status != 0)
	319	{ /* something happened */
	320	decContextSetStatus (set, dc.status); /* .. pass it on */
	321	}
	322	return result;
	323	}
	324
	325
	326	#if DECTRACE \|\| DECCHECK
	327	/* ------------------------------------------------------------------ */
	328	/* decimal128Show -- display a single in hexadecimal [debug aid] */
	329	/* d128 -- the number to show */
	330	/* ------------------------------------------------------------------ */
	331	/* Also shows sign/cob/expconfields extracted */
	332	void
aa4f41c1	333	decimal128Show (const decimal128 * d128)
473a74b9 BE	334	{
	335	char buf[DECIMAL128_Bytes * 2 + 1];
	336	Int i, j;
	337	j = 0;
	338	for (i = 0; i < DECIMAL128_Bytes; i++)
	339	{
	340	sprintf (&buf[j], "%02x", d128->bytes[i]);
	341	j = j + 2;
	342	}
	343	printf (" D128> %s [S:%d Cb:%02x E:%d]\n", buf,
	344	decimal128Sign (d128), decimal128Comb (d128),
	345	decimal128ExpCon (d128));
	346	}
	347	#endif