/*

 * © Portions copyright (c) 2006-2007 Nokia Corporation.  All rights reserved.

 *

 * Copyright (c) 1999

 * Silicon Graphics Computer Systems, Inc.

 *

 * Copyright (c) 1999 

 * Boris Fomitchev

 *

 * This material is provided "as is", with absolutely no warranty expressed

 * or implied. Any use is at your own risk.

 *

 * Permission to use or copy this software for any purpose is hereby granted 

 * without fee, provided the above notices are retained on all copies.

 * Permission to modify the code and to distribute modified code is granted,

 * provided the above notices are retained, and a notice that the code was

 * modified is included with the above copyright notice.

 *

 */

# include "stlport_prefix.h"

# ifdef __DECCXX

#define NDIG 400

# else

#define NDIG 82

# endif

# ifdef _STLP_NO_LONG_DOUBLE

#  define MAXECVT 17

#  define MAXFCVT 18

typedef double max_double_type;

# else

#  define MAXECVT 35

#  define MAXFCVT 36

typedef long double max_double_type;

# endif

#define MAXFSIG MAXECVT

#define MAXESIZ 5

#define todigit(x) ((x)+'0')

# include <stl/_config.h>

# ifdef _STLP_UNIX

# if defined (__sun) 

#  include <floatingpoint.h>

# endif

//# if !(defined(_STLP_USE_GLIBC) || defined(__FreeBSD__) || defined(__NetBSD__) || defined (_AIX) || defined(__MVS__) || defined (__OS400__) || defined (__QNXNTO__) || defined (__APPLE__) || defined (__DJGPP))

# if defined (__sun) || defined (__digital__) || defined (__sgi) || defined (_STLP_SCO_OPENSERVER) || defined (__NCR_SVR)

// DEC, SGI & Solaris need this

#  include <values.h>

#  include <nan.h>

# endif

# if defined (__QNXNTO__) || ( defined(__GNUC__) && defined(__APPLE__) )

#  define USE_SPRINTF_INSTEAD

# endif

#  if defined( _AIX ) // JFA 3-Aug-2000

#    include <math.h>

#    include <float.h>

#  endif

# endif

# include <cstdlib>

//#if defined(_CRAY)

//# include <stdlib.h>

//#endif

#if defined (_MSC_VER) || defined (__MINGW32__) || defined (__BORLANDC__) || defined (__DJGPP)  || defined (_STLP_SCO_OPENSERVER) || defined (__NCR_SVR)

# include <float.h>

#endif

#if defined(__MRC__) || defined(__SC__)	|| defined(_CRAY)	//*TY 02/24/2000 - added support for MPW

# include <fp.h>

#endif

#include <cmath>

#if defined( __MSL__ )

# include <cstdlib>	// for atoi

# include <cstdio>	// for snprintf

# include <algorithm>

# include <cassert>

#endif

#if defined (__ISCPP__)

# include <cfloat>

#endif

# include "num_put.h"

# include <algorithm>

#if defined(__hpux) && !defined(_INCLUDE_HPUX_SOURCE)

     extern "C" double erf(double);

     extern "C" double erfc(double);

     extern "C" double gamma(double);                             /* obsolescent */

     extern "C" double hypot(double, double);

     extern "C" int    isnan(double);

     extern "C" double j0(double);

     extern "C" double j1(double);

     extern "C" double jn(int, double);

     extern "C" double lgamma(double);

     extern "C" double y0(double);

     extern "C" double y1(double);

     extern "C" double yn(int, double);

#  define HUGE_VALF     _SINFINITY

#  define INFINITY      _SINFINITY

#  define NAN           _SQNAN

#  define isnan(x)              _ISNAN(x)

#  define isinf(x)              _ISINF(x)

#  define signbit(x)            _SIGNBIT(x)

#  define isfinite(x)           _ISFINITE(x)

#  define isnormal(x)           _ISNORMAL(x)

#  define fpclassify(x)         _FPCLASSIFY(x)

#  define isunordered(x,y)      _ISUNORDERED(x,y)

#  define isgreater(x,y)        _ISGREATER(x,y)

#  define isgreaterequal(x,y)   _ISGREATEREQUAL(x,y)

#  define isless(x,y)           _ISLESS(x,y)

#  define islessequal(x,y)      _ISLESSEQUAL(x,y)

#  define islessgreater(x,y)    _ISLESSGREATER(x,y)

#  define FP_NORMAL     0

#  define FP_ZERO       1

#  define FP_INFINITE   2

#  define FP_SUBNORMAL  3

#  define FP_NAN        4

#  define DECIMAL_DIG   17

#  define _IS64(x) (sizeof(x)==sizeof(double))

#  define _IS32(x) (sizeof(x)==sizeof(float))

extern "C" {

     extern double copysign(double, double);

     extern const float _SINFINITY;

     extern const float _SQNAN;

#    ifdef _PA_RISC

#      define _ISNAN(x)          (_IS32(x)?_Isnanf(x):(isnan)(x))

#      define _ISINF(x)          (_IS32(x)?_Isinff(x):_Isinf(x))

#      define _SIGNBIT(x)        (_IS32(x)?_Signbitf(x):_Signbit(x))

#      define _ISFINITE(x)       (_IS32(x)?_Isfinitef(x):_Isfinite(x))

#      define _ISNORMAL(x)       (_IS32(x)?_Isnormalf(x):_Isnormal(x))

#      define _FPCLASSIFY(x)     (_IS32(x)?_Fpclassifyf(x)>>1:_Fpclassify(x)>>1)

#      define _ISUNORDERED(x,y)  (_IS32(x)&&_IS32(y)?_Isunorderedf(x,y):_Isunordered(x,y))

       extern int _Signbit(double);

       extern int _Signbitf(float);

       extern int _Isnanf(float);

       extern int _Isfinite(double);

       extern int _Isfinitef(float);

       extern int _Isinf(double);

       extern int _Isinff(float);

       extern int _Isnormal(double);

       extern int _Isnormalf(float);

       extern int _Isunordered(double, double);

       extern int _Isunorderedf(float, float);

       extern int _Fpclassify(double);

       extern int _Fpclassifyf(float);

#    else

#      include "math_ia64_internal.h"

#      define _FPCLASSIFY(x)     (_IS32(x)?_Fpclassf(x):_Fpclass(x))

       extern int _Fpclass(double);

       extern int _Fpclassf(float);

#    endif

}

#ifndef _INCLUDE_XOPEN_SOURCE_EXTENDED

extern "C" char *fcvt(double, int, int *, int *);

extern "C" char *ecvt(double, int, int *, int *);

#endif

#ifndef _INCLUDE_HPUX_SOURCE

#  ifndef _LONG_DOUBLE

#    define _LONG_DOUBLE

     typedef struct {

       uint32_t word1, word2, word3, word4;

     } long_double;

#  endif /* _LONG_DOUBLE */

extern "C" char *_ldecvt(long_double, int, int *, int *);

extern "C" char *_ldfcvt(long_double, int, int *, int *);

#endif

#endif /* __hpux */

_STLP_BEGIN_NAMESPACE

#if defined (__MWERKS__) || defined(__BEOS__)

#  define USE_SPRINTF_INSTEAD

#endif

# if defined (_AIX)

// Some OS'es only provide non-reentrant primitives, so we have to use additional synchronization here

# ifdef _REENTRANT

static _STLP_STATIC_MUTEX __put_float_mutex _STLP_MUTEX_INITIALIZER;

# define LOCK_CVT _STLP_auto_lock lock(__put_float_mutex);

# define RETURN_CVT(ecvt, x, n, pt, sign, buf) strcpy(buf, ecvt(x, n, pt, sign)); return buf;

# else

# define LOCK_CVT

# define RETURN_CVT(ecvt, x, n, pt, sign, buf) return ecvt(x, n, pt, sign);

# endif

# endif

// Tests for infinity and NaN differ on different OSs.  We encapsulate

// these differences here.

#ifdef USE_SPRINTF_INSTEAD

#elif defined (__hpux) || defined (__DJGPP) || ( defined(_STLP_USE_GLIBC) && ! defined (__MSL__) )

#  if defined (isfinite) 

inline bool _Stl_is_nan_or_inf(double x) { return !isfinite(x); }

#  else

inline bool _Stl_is_nan_or_inf(double x) { return !finite(x); }

#  endif

inline bool _Stl_is_neg_nan(double x)    { return isnan(x) && ( copysign(1., x) < 0 ); }

inline bool _Stl_is_inf(double x)        { return isinf(x); }

// inline bool _Stl_is_neg_inf(double x)    { return isinf(x) < 0; }  

inline bool _Stl_is_neg_inf(double x)    { return isinf(x) && x < 0; }

#elif defined(__unix) && !defined(__FreeBSD__)  && !defined(__NetBSD__) \

      && !defined(__APPLE__)  && !defined(__DJGPP) && !defined(__osf__) \

      && !defined(_CRAY)

inline bool _Stl_is_nan_or_inf(double x) { return IsNANorINF(x); }

inline bool _Stl_is_inf(double x)        { return IsNANorINF(x) && IsINF(x); }

inline bool _Stl_is_neg_inf(double x)    { return (IsINF(x)) && (x < 0.0); }

inline bool _Stl_is_neg_nan(double x)    { return IsNegNAN(x); }

# elif defined (__BORLANDC__) && ( __BORLANDC__ < 0x540 )

inline bool _Stl_is_nan_or_inf(double x) {  return !_finite(x); }

inline bool _Stl_is_inf(double x)        {  return _Stl_is_nan_or_inf(x) && ! _isnan(x);}

inline bool _Stl_is_neg_inf(double x)    {  return _Stl_is_inf(x) && x < 0 ; }

inline bool _Stl_is_neg_nan(double x)    { return _isnan(x) && x < 0 ; } 

#elif defined (_MSC_VER) || (defined (__MINGW32__) && !defined (__SYMBIAN32__)) || defined (__BORLANDC__) 

inline bool _Stl_is_nan_or_inf(double x) { return !_finite(x); }

inline bool _Stl_is_inf(double x)        { 

  int fclass = _fpclass(x); 

  return fclass == _FPCLASS_NINF || fclass == _FPCLASS_PINF; 

}

inline bool _Stl_is_neg_inf(double x)    { return _fpclass(x) == _FPCLASS_NINF; }

inline bool _Stl_is_neg_nan(double x)    { return _isnan(x) && _copysign(1., x) < 0 ; } 

#elif defined(__MRC__) || defined(__SC__)		//*TY 02/24/2000 - added support for MPW

bool _Stl_is_nan_or_inf(double x) { return isnan(x) || !isfinite(x); }

bool _Stl_is_inf(double x)        { return !isfinite(x); }

bool _Stl_is_neg_inf(double x)    { return !isfinite(x) && signbit(x); }

bool _Stl_is_neg_nan(double x)    { return isnan(x) && signbit(x); }

#elif /* defined (__FreeBSD__) */ ( defined (__GNUC__) && defined (__APPLE__) )

inline bool _Stl_is_nan_or_inf(double x) { return !finite(x); }

inline bool _Stl_is_inf(double x)        {   return _Stl_is_nan_or_inf(x) && ! isnan(x); }

inline bool _Stl_is_neg_inf(double x)    {   return _Stl_is_inf(x) && x < 0 ; }

inline bool _Stl_is_neg_nan(double x)    { return isnan(x) && copysign(1., x) < 0 ; } 

#elif defined( _AIX ) // JFA 11-Aug-2000

bool _Stl_is_nan_or_inf(double x) { return isnan(x) || !finite(x); }

bool _Stl_is_inf(double x)        { return !finite(x); }

// bool _Stl_is_neg_inf(double x)    { return _class(x) == FP_MINUS_INF; }

bool _Stl_is_neg_inf(double x)    { return _Stl_is_inf(x) && ( copysign(1., x) < 0 );  }

bool _Stl_is_neg_nan(double x)    { return isnan(x) && ( copysign(1., x) < 0 );  }

#elif defined (__ISCPP__)

inline bool _Stl_is_nan_or_inf  (double x) { return _fp_isINF(x) || _fp_isNAN(x); }

inline bool _Stl_is_inf         (double x) { return _fp_isINF(x); }

inline bool _Stl_is_neg_inf     (double x) { return _fp_isINF(x) && x < 0; }

inline bool _Stl_is_neg_nan     (double x) { return _fp_isNAN(x) && x < 0; }

#elif defined(_CRAY)

 #if defined(_CRAYIEEE)

inline bool _Stl_is_nan_or_inf(double x) { return isnan(x) || isinf(x); }

inline bool _Stl_is_inf(double x)        { return isinf(x); }

inline bool _Stl_is_neg_inf(double x)    { return isinf(x) && signbit(x); }

inline bool _Stl_is_neg_nan(double x)    { return isnan(x) && signbit(x); }

 #else

inline bool _Stl_is_nan_or_inf(double x) { return false; }

inline bool _Stl_is_inf(double x)        { return false; }

inline bool _Stl_is_neg_inf(double x)    { return false; }

inline bool _Stl_is_neg_nan(double x)    { return false; }

 #endif

#elif ! defined (USE_SPRINTF_INSTEAD)

# define USE_SPRINTF_INSTEAD

#endif

# ifndef  USE_SPRINTF_INSTEAD

// Reentrant versions of floating-point conversion functions.  The argument

// lists look slightly different on different operating systems, so we're

// encapsulating the differences here.

#if defined (__CYGWIN__) || defined(__DJGPP)

  inline char* _Stl_ecvtR(double x, int n, int* pt, int* sign, char* buf)

    { return ecvtbuf(x, n, pt, sign, buf); }

  inline char* _Stl_fcvtR(double x, int n, int* pt, int* sign, char* buf)

    { return fcvtbuf(x, n, pt, sign, buf); }

# ifndef _STLP_NO_LONG_DOUBLE

  inline char* _Stl_qecvtR(long double x, int n, int* pt, int* sign, char* buf)

    { return ecvtbuf(x, n, pt, sign, buf); }

  inline char* _Stl_qfcvtR(long double x, int n, int* pt, int* sign, char* buf)

    { return fcvtbuf(x, n, pt, sign, buf); }

# endif

#elif defined (_STLP_USE_GLIBC)

  inline char* _Stl_ecvtR(double x, int n, int* pt, int* sign, char* buf)

    { return buf + ecvt_r(x, n, pt, sign, buf, NDIG+2); }

  inline char* _Stl_fcvtR(double x, int n, int* pt, int* sign, char* buf)

    { return buf + fcvt_r(x, n, pt, sign, buf, NDIG+2); }

#  ifndef _STLP_NO_LONG_DOUBLE

  inline char* _Stl_qecvtR(long double x, int n, int* pt, int* sign, char* buf)

    { return buf + qecvt_r(x, n, pt, sign, buf, NDIG+2); }

  inline char* _Stl_qfcvtR(long double x, int n, int* pt, int* sign, char* buf)

    { return buf + qfcvt_r(x, n, pt, sign, buf, NDIG+2); }

#  endif

#elif defined (_STLP_SCO_OPENSERVER) || defined (__NCR_SVR)

  inline char* _Stl_ecvtR(double x, int n, int* pt, int* sign, char* buf)

    { return ecvt(x, n, pt, sign); }

  inline char* _Stl_fcvtR(double x, int n, int* pt, int* sign, char* buf)

    { return fcvt(x, n, pt, sign); }

#  ifndef _STLP_NO_LONG_DOUBLE

  inline char* _Stl_qecvtR(long double x, int n, int* pt, int* sign, char* buf)

    { return ecvtl(x, n, pt, sign); }

  inline char* _Stl_qfcvtR(long double x, int n, int* pt, int* sign, char* buf)

    { return fcvtl(x, n, pt, sign); }

#  endif

#elif defined (__sun)

  inline char* _Stl_ecvtR(double x, int n, int* pt, int* sign, char* buf)

    { return econvert(x, n, pt, sign, buf); }

  inline char* _Stl_fcvtR(double x, int n, int* pt, int* sign, char* buf)

    { return fconvert(x, n, pt, sign, buf); }

#  ifndef _STLP_NO_LONG_DOUBLE

  inline char* _Stl_qecvtR(long double x, int n, int* pt, int* sign, char* buf)

    { return qeconvert(&x, n, pt, sign, buf); }

  inline char* _Stl_qfcvtR(long double x, int n, int* pt, int* sign, char* buf)

    { return qfconvert(&x, n, pt, sign, buf); }

#  endif

#elif defined (__DECCXX) 

  inline char* _Stl_ecvtR(double x, int n, int* pt, int* sign, char* buf)

    { return (ecvt_r(x, n, pt, sign, buf, NDIG)==0 ? buf : 0); }

  inline char* _Stl_fcvtR(double x, int n, int* pt, int* sign, char* buf)

    { return (fcvt_r(x, n, pt, sign, buf, NDIG)==0 ? buf : 0); }

#  ifndef _STLP_NO_LONG_DOUBLE

// fbp : no "long double" conversions !

  inline char* _Stl_qecvtR(long double x, int n, int* pt, int* sign, char* buf)

    { return (ecvt_r((double)x, n, pt, sign, buf, NDIG)==0 ? buf : 0) ; }

  inline char* _Stl_qfcvtR(long double x, int n, int* pt, int* sign, char* buf)

    { return (fcvt_r((double)x, n, pt, sign, buf, NDIG)==0 ? buf : 0); }

#  endif

#elif defined (__hpux)

   inline char* _Stl_ecvtR(double x, int n, int* pt, int* sign, char* buf)

     { return ecvt(x, n, pt, sign); }

   inline char* _Stl_fcvtR(double x, int n, int* pt, int* sign, char* buf)

     { return fcvt(x, n, pt, sign); }

# ifndef _STLP_NO_LONG_DOUBLE

#  if defined( _REENTRANT ) && (defined(_PTHREADS_DRAFT4) || defined(PTHREAD_THREADS_MAX))

   inline char* _Stl_qecvtR(long double x, int n, int* pt, int* sign, char* buf)

     { return (_ldecvt_r(*(long_double*)&x, n, pt, sign, buf, NDIG+2)==0 ? buf : 0); }

   inline char* _Stl_qfcvtR(long double x, int n, int* pt, int* sign, char* buf)

     { return (_ldfcvt_r(*(long_double*)&x, n, pt, sign, buf, NDIG+2)==0 ? buf : 0); }

#  else

   inline char* _Stl_qecvtR(long double x, int n, int* pt, int* sign, char* buf)

     { return _ldecvt(*(long_double*)&x, n, pt, sign); }

   inline char* _Stl_qfcvtR(long double x, int n, int* pt, int* sign, char* buf)

     { return _ldfcvt(*(long_double*)&x, n, pt, sign); }

#  endif

# endif

#elif defined (_AIX)

  inline char* _Stl_ecvtR(double x, int n, int* pt, int* sign, char* buf)

    { LOCK_CVT RETURN_CVT(ecvt, x, n, pt, sign, buf) }

  inline char* _Stl_fcvtR(double x, int n, int* pt, int* sign, char* buf)

    { LOCK_CVT RETURN_CVT(fcvt, x, n, pt, sign, buf) }

# ifndef _STLP_NO_LONG_DOUBLE

  inline char* _Stl_qecvtR(long double x, int n, int* pt, int* sign, char* buf)

    { LOCK_CVT RETURN_CVT(ecvt, x, n, pt, sign, buf) }

  inline char* _Stl_qfcvtR(long double x, int n, int* pt, int* sign, char* buf)

    { LOCK_CVT RETURN_CVT(fcvt, x, n, pt, sign, buf) }

# endif

#elif defined (__unix)  && !defined(__FreeBSD__)  && !defined(__NetBSD__) && !defined(__APPLE__) && !defined(_CRAY)

  inline char* _Stl_ecvtR(double x, int n, int* pt, int* sign, char* buf)

    { return ecvt_r(x, n, pt, sign, buf); }

  inline char* _Stl_fcvtR(double x, int n, int* pt, int* sign, char* buf)

    { return fcvt_r(x, n, pt, sign, buf); }

# ifndef _STLP_NO_LONG_DOUBLE

  inline char* _Stl_qecvtR(long double x, int n, int* pt, int* sign, char* buf)

    { return qecvt_r(x, n, pt, sign, buf); }

  inline char* _Stl_qfcvtR(long double x, int n, int* pt, int* sign, char* buf)

    { return qfcvt_r(x, n, pt, sign, buf); }

#  endif

#elif defined (_MSC_VER) || defined (__MINGW32__) || defined (__BORLANDC__)

// those guys claim _cvt functions being reentrant.

inline char* _Stl_ecvtR(double x, int n, int* pt, int* sign, char* buf) {  return _ecvt(x, n, pt, sign); }

inline char* _Stl_fcvtR(double x, int n, int* pt, int* sign, char* buf) { return _fcvt(x, n, pt, sign); }

# ifndef _STLP_NO_LONG_DOUBLE

inline char* _Stl_qecvtR(long double x, int n, int* pt, int* sign, char* buf) { return _ecvt((double)x, n, pt, sign); }

inline char* _Stl_qfcvtR(long double x, int n, int* pt, int* sign, char* buf) { return _fcvt((double)x, n, pt, sign); }

# endif

#elif defined (__ISCPP__)

inline char* _Stl_ecvtR(double x, int n, int* pt, int* sign, char* buf)

{ return _fp_ecvt( x, n, pt, sign, buf); }

inline char* _Stl_fcvtR(double x, int n, int* pt, int* sign, char* buf)

{ return _fp_fcvt(x, n, pt, sign, buf); }

# ifndef _STLP_NO_LONG_DOUBLE

inline char* _Stl_qecvtR(long double x, int n, int* pt, int* sign, char* buf)

{ return _fp_ecvt( x, n, pt, sign, buf); }

inline char* _Stl_qfcvtR(long double x, int n, int* pt, int* sign, char* buf)

{ return _fp_fcvt(x, n, pt, sign, buf); }

# endif

#elif defined (__MRC__) || defined(__SC__) || defined(_CRAY)

inline char* _Stl_ecvtR(double x, int n, int* pt, int* sign, char* )

{ return ecvt( x, n, pt, sign ); }

inline char* _Stl_fcvtR(double x, int n, int* pt, int* sign, char* )

{ return fcvt(x, n, pt, sign); }

#ifndef _STLP_NO_LONG_DOUBLE

inline char* _Stl_qecvtR(long double x, int n, int* pt, int* sign, char* )

{ return ecvt( x, n, pt, sign ); }

inline char* _Stl_qfcvtR(long double x, int n, int* pt, int* sign, char* )

{ return fcvt(x, n, pt, sign); }

#endif

#endif

//----------------------------------------------------------------------

// num_put

// Helper functions for _M_do_put_float

// __format_float formats a mantissa and exponent as returned by

// one of the conversion functions (ecvt_r, fcvt_r, qecvt_r, qfcvt_r)

// according to the specified precision and format flags.  This is

// based on doprnt but is much simpler since it is concerned only

// with floating point input and does not consider all formats.  It

// also does not deal with blank padding, which is handled by

// __copy_float_and_fill. 

void __format_float_scientific(char * buf, const char * bp, 

			       int decpt, int sign, bool is_zero,

			       ios_base::fmtflags flags,

			       int precision, bool /* islong */)

{

  char * suffix;

  char expbuf[MAXESIZ + 2];

  // sign if required

  if (sign)

    *buf++ = '-';

  else if (flags & ios_base::showpos)

    *buf++ = '+';

  // first digit of mantissa

  *buf++ = *bp++;

  // decimal point if required

  if (precision != 0 || flags & ios_base::showpoint)

    *buf++ = '.';

  // rest of mantissa

  int rz = precision;

  while (rz-- > 0 && *bp != 0)

    *buf++ = *bp++;

  // exponent

  *(suffix = &expbuf[MAXESIZ]) = 0;

  if (!is_zero) {

    int nn = decpt - 1;

    if (nn < 0)

      nn = -nn;

    for (; nn > 9; nn /= 10)

      *--suffix = (char) todigit(nn % 10);

    *--suffix = (char) todigit(nn);

  }

  // prepend leading zeros to exponent

  while (suffix > &expbuf[MAXESIZ - 2])

    *--suffix = '0';

  // put in the exponent sign

  *--suffix = (char) ((decpt > 0 || is_zero ) ? '+' : '-');

  // put in the e

  *--suffix = flags & ios_base::uppercase ? 'E' : 'e';

  // copy the suffix

  strcpy(buf, suffix);

}

static inline 

void __flush_static_buf(string &buf, 

                        char *sbeginbuf, char *sendbuf, char *&scurpos) {

  if (scurpos == sendbuf) {

    buf.append(sbeginbuf, sendbuf);

    scurpos = sbeginbuf;

  }

}

void __format_float_fixed(string &buf, const char * bp,

			  int decpt, int sign, bool /* x */,

			  ios_base::fmtflags flags,

			  int precision, bool islong )

{

  char static_buf[128];

  char *sbuf = static_buf;

  char *sendbuf = static_buf + sizeof(static_buf);

  if (sign && decpt > -precision && *bp != 0)

    *sbuf++ = '-';

  else if (flags & ios_base::showpos)

    *sbuf++ = '+';

  int rzero   = 0;

  int nn      = decpt;

  int k       = 0;

  int maxfsig = islong ? 2*MAXFSIG : MAXFSIG;

  do {

    *sbuf++ = (char) ((nn <= 0 || *bp == 0 || k >= maxfsig) ?

      '0' : (k++, *bp++));

    __flush_static_buf(buf, static_buf, sendbuf, sbuf);

  } while (--nn > 0);

  // decimal point if needed

  if (flags & ios_base::showpoint || precision > 0) {

    *sbuf++ = '.';

    __flush_static_buf(buf, static_buf, sendbuf, sbuf);

  }

  // digits after decimal point if any

  nn = (min) (precision, MAXFCVT);

  if (precision > nn)