/*
* 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"
#include <cmath>
#include <ios>
#include <locale>
#if defined (__DECCXX)
# define NDIG 400
#else
# define NDIG 82
#endif
#define todigit(x) ((x)+'0')
#if defined (_STLP_UNIX)
# if defined (__sun)
# include <floatingpoint.h>
# endif
# 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__) ) || defined(_STLP_USE_UCLIBC) /* 0.9.26 */ || \
defined(__FreeBSD__)
# define USE_SPRINTF_INSTEAD
# endif
# if defined (_AIX) // JFA 3-Aug-2000
# include <math.h>
# include <float.h>
# endif
# include <math.h>
#endif
#include <cstdio>
#include <cstdlib>
#if defined (_STLP_MSVC_LIB) || 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
#if defined (__CYGWIN__)
# include <ieeefp.h>
#endif
#if defined (__MSL__)
# include <cstdlib> // for atoi
# include <cstdio> // for snprintf
# include <algorithm>
# include <cassert>
#endif
#if defined (__ISCPP__)
# include <cfloat>
#endif
#include <algorithm>
#if defined (__DMC__)
# define snprintf _snprintf
#endif
_STLP_BEGIN_NAMESPACE
_STLP_MOVE_TO_PRIV_NAMESPACE
#if defined (__MWERKS__) || defined(__BEOS__)
# define USE_SPRINTF_INSTEAD
#endif
template <int N>
struct _Dig
{
enum { dig = _Dig<N/10>::dig + 1 };
};
_STLP_TEMPLATE_NULL
struct _Dig<0>
{
enum { dig = 0 };
};
#ifdef _STLP_NO_LONG_DOUBLE
# define MAXEDIGITS int(_Dig<DBL_MAX_10_EXP>::dig)
# define MAXFSIG DBL_DIG
# define MAXFCVT (DBL_DIG + 1)
#else
# define MAXEDIGITS int(_Dig<LDBL_MAX_10_EXP>::dig)
# define MAXFSIG LDBL_DIG
# define MAXFCVT (LDBL_DIG + 1)
#endif
// Tests for infinity and NaN differ on different OSs. We encapsulate
// these differences here.
#if !defined (USE_SPRINTF_INSTEAD)
# if defined (__hpux) && defined (__GNUC__)
# define _STLP_USE_SIGN_HELPER
# elif defined (__DJGPP) || (defined (_STLP_USE_GLIBC) && ! defined (__MSL__)) || \
defined (__CYGWIN__) || \
defined (__FreeBSD__) || defined (__NetBSD__) || defined (__OpenBSD__) || \
defined (__HP_aCC)
static inline bool _Stl_is_nan_or_inf(double x)
# if defined (isfinite)
{ return !isfinite(x); }
# else
{ return !finite(x); }
# endif
static inline bool _Stl_is_neg_nan(double x) { return isnan(x) && ( copysign(1., x) < 0 ); }
static inline bool _Stl_is_inf(double x) { return isinf(x); }
// inline bool _Stl_is_neg_inf(double x) { return isinf(x) < 0; }
static inline bool _Stl_is_neg_inf(double x) { return isinf(x) && x < 0; }
# elif (defined (__unix) || defined (__unix__)) && \
!defined (__APPLE__) && !defined (__DJGPP) && !defined(__osf__) && \
!defined (_CRAY) && !defined (__ANDROID__)
static inline bool _Stl_is_nan_or_inf(double x) { return IsNANorINF(x); }
static inline bool _Stl_is_inf(double x) { return IsNANorINF(x) && IsINF(x); }
static inline bool _Stl_is_neg_inf(double x) { return (IsINF(x)) && (x < 0.0); }
static inline bool _Stl_is_neg_nan(double x) { return IsNegNAN(x); }
# elif defined (_STLP_MSVC_LIB) || defined (__MINGW32__) || defined (__BORLANDC__)
static inline bool _Stl_is_nan_or_inf(double x) { return !_finite(x); }
# if !defined (__BORLANDC__)
static inline bool _Stl_is_inf(double x) {
int fclass = _fpclass(x);
return fclass == _FPCLASS_NINF || fclass == _FPCLASS_PINF;
}
static inline bool _Stl_is_neg_inf(double x) { return _fpclass(x) == _FPCLASS_NINF; }
# else
static inline bool _Stl_is_inf(double x) { return _Stl_is_nan_or_inf(x) && !_isnan(x);}
static inline bool _Stl_is_neg_inf(double x) { return _Stl_is_inf(x) && x < 0 ; }
# endif
static inline bool _Stl_is_neg_nan(double x) { return _isnan(x) && _copysign(1., x) < 0 ; }
# if defined (__BORLANDC__)
static inline bool _Stl_is_nan_or_inf(long double x) { return !_finitel(x); }
static inline bool _Stl_is_inf(long double x) { return _Stl_is_nan_or_inf(x) && !_isnanl(x);}
static inline bool _Stl_is_neg_inf(long double x) { return _Stl_is_inf(x) && x < 0 ; }
static inline bool _Stl_is_neg_nan(long double x) { return _isnanl(x) && _copysignl(1.l, x) < 0 ; }
# elif !defined (_STLP_NO_LONG_DOUBLE)
// Simply there to avoid warning long double -> double implicit conversion:
static inline bool _Stl_is_nan_or_inf(long double x) { return _Stl_is_nan_or_inf(__STATIC_CAST(double, x)); }
static inline bool _Stl_is_inf(long double x) { return _Stl_is_inf(__STATIC_CAST(double, x));}
static inline bool _Stl_is_neg_inf(long double x) { return _Stl_is_neg_inf(__STATIC_CAST(double, x)); }
static inline bool _Stl_is_neg_nan(long double x) { return _Stl_is_neg_nan(__STATIC_CAST(double, x)); }
# endif
# elif defined (__MRC__) || defined (__SC__) || defined (__DMC__)
static bool _Stl_is_nan_or_inf(double x) { return isnan(x) || !isfinite(x); }
static bool _Stl_is_inf(double x) { return !isfinite(x); }
static bool _Stl_is_neg_inf(double x) { return !isfinite(x) && signbit(x); }
static bool _Stl_is_neg_nan(double x) { return isnan(x) && signbit(x); }
# elif /* defined(__FreeBSD__) || defined(__OpenBSD__) || */ (defined(__GNUC__) && defined(__APPLE__))
static inline bool _Stl_is_nan_or_inf(double x) { return !finite(x); }
static inline bool _Stl_is_inf(double x) { return _Stl_is_nan_or_inf(x) && ! isnan(x); }
static inline bool _Stl_is_neg_inf(double x) { return _Stl_is_inf(x) && x < 0 ; }
static inline bool _Stl_is_neg_nan(double x) { return isnan(x) && copysign(1., x) < 0 ; }
# elif defined( _AIX ) // JFA 11-Aug-2000
static bool _Stl_is_nan_or_inf(double x) { return isnan(x) || !finite(x); }
static bool _Stl_is_inf(double x) { return !finite(x); }
// bool _Stl_is_neg_inf(double x) { return _class(x) == FP_MINUS_INF; }
static bool _Stl_is_neg_inf(double x) { return _Stl_is_inf(x) && ( copysign(1., x) < 0 ); }
static bool _Stl_is_neg_nan(double x) { return isnan(x) && ( copysign(1., x) < 0 ); }
# elif defined (__ISCPP__)
static inline bool _Stl_is_nan_or_inf (double x) { return _fp_isINF(x) || _fp_isNAN(x); }
static inline bool _Stl_is_inf (double x) { return _fp_isINF(x); }
static inline bool _Stl_is_neg_inf (double x) { return _fp_isINF(x) && x < 0; }
static inline bool _Stl_is_neg_nan (double x) { return _fp_isNAN(x) && x < 0; }
# elif defined (_CRAY)
# if defined (_CRAYIEEE)
static inline bool _Stl_is_nan_or_inf(double x) { return isnan(x) || isinf(x); }
static inline bool _Stl_is_inf(double x) { return isinf(x); }
static inline bool _Stl_is_neg_inf(double x) { return isinf(x) && signbit(x); }
static inline bool _Stl_is_neg_nan(double x) { return isnan(x) && signbit(x); }
# else
static inline bool _Stl_is_nan_or_inf(double x) { return false; }
static inline bool _Stl_is_inf(double x) { return false; }
static inline bool _Stl_is_neg_inf(double x) { return false; }
static inline bool _Stl_is_neg_nan(double x) { return false; }
# endif
# else // nothing from above
# define USE_SPRINTF_INSTEAD
# endif
#endif // !USE_SPRINTF_INSTEAD
#if !defined (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)
static inline char* _Stl_ecvtR(double x, int n, int* pt, int* sign, char* buf)
{ return ecvtbuf(x, n, pt, sign, buf); }
static inline char* _Stl_fcvtR(double x, int n, int* pt, int* sign, char* buf)
{ return fcvtbuf(x, n, pt, sign, buf); }
# if !defined (_STLP_NO_LONG_DOUBLE)
# if defined (__CYGWIN__)
# define _STLP_EMULATE_LONG_DOUBLE_CVT
# else
static inline char* _Stl_ecvtR(long double x, int n, int* pt, int* sign, char* buf)
{ return ecvtbuf(x, n, pt, sign, buf); }
static inline char* _Stl_fcvtR(long double x, int n, int* pt, int* sign, char* buf)
{ return fcvtbuf(x, n, pt, sign, buf); }
# endif
# endif
# elif defined (_STLP_USE_GLIBC)
static inline char* _Stl_ecvtR(double x, int n, int* pt, int* sign, char* buf, size_t bsize)
{ return ecvt_r(x, n, pt, sign, buf, bsize) == 0 ? buf : 0; }
static inline char* _Stl_fcvtR(double x, int n, int* pt, int* sign, char* buf, size_t bsize)
{ return fcvt_r(x, n, pt, sign, buf, bsize) == 0 ? buf : 0; }
# ifndef _STLP_NO_LONG_DOUBLE
static inline char* _Stl_ecvtR(long double x, int n, int* pt, int* sign, char* buf, size_t bsize)
{ return qecvt_r(x, n, pt, sign, buf, bsize) == 0 ? buf : 0; }
static inline char* _Stl_fcvtR(long double x, int n, int* pt, int* sign, char* buf, size_t bsize)
{ return qfcvt_r(x, n, pt, sign, buf, bsize) == 0 ? buf : 0; }
# endif
# define _STLP_NEED_CVT_BUFFER_SIZE
# elif defined (__sun)
static inline char* _Stl_ecvtR(double x, int n, int* pt, int* sign, char* buf)
{ return econvert(x, n, pt, sign, buf); }
static 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
static inline char* _Stl_ecvtR(long double x, int n, int* pt, int* sign, char* buf)
{ return qeconvert(&x, n, pt, sign, buf); }
static inline char* _Stl_fcvtR(long double x, int n, int* pt, int* sign, char* buf)
{ return qfconvert(&x, n, pt, sign, buf); }
# endif
# elif defined (__DECCXX)
static inline char* _Stl_ecvtR(double x, int n, int* pt, int* sign, char* buf, size_t bsize)
{ return (ecvt_r(x, n, pt, sign, buf, bsize) == 0 ? buf : 0); }
static inline char* _Stl_fcvtR(double x, int n, int* pt, int* sign, char* buf, size_t bsize)
{ return (fcvt_r(x, n, pt, sign, buf, bsize) == 0 ? buf : 0); }
# ifndef _STLP_NO_LONG_DOUBLE
// fbp : no "long double" conversions !
static inline char* _Stl_ecvtR(long double x, int n, int* pt, int* sign, char* buf, size_t bsize)
{ return (ecvt_r((double)x, n, pt, sign, buf, bsize) == 0 ? buf : 0) ; }
static inline char* _Stl_fcvtR(long double x, int n, int* pt, int* sign, char* buf, size_t bsize)
{ return (fcvt_r((double)x, n, pt, sign, buf, bsize) == 0 ? buf : 0); }
# endif
# define _STLP_NEED_CVT_BUFFER_SIZE
# elif defined (__hpux)
static inline char* _Stl_ecvtR(double x, int n, int* pt, int* sign)
{ return ecvt(x, n, pt, sign); }
static inline char* _Stl_fcvtR(double x, int n, int* pt, int* sign)
{ return fcvt(x, n, pt, sign); }
# if !defined (_STLP_NO_LONG_DOUBLE)
static inline char* _Stl_ecvtR(long double x, int n, int* pt, int* sign)
{ return _ldecvt(*(long_double*)&x, n, pt, sign); }
static inline char* _Stl_fcvtR(long double x, int n, int* pt, int* sign)
{ return _ldfcvt(*(long_double*)&x, n, pt, sign); }
# endif
# define _STLP_CVT_NEED_SYNCHRONIZATION
# elif defined (__unix) && !defined (__APPLE__) && !defined (_CRAY) && \
!defined (__ANDROID__)
static inline char* _Stl_ecvtR(double x, int n, int* pt, int* sign, char* buf)
{ return ecvt_r(x, n, pt, sign, buf); }
static inline char* _Stl_fcvtR(double x, int n, int* pt, int* sign, char* buf)
{ return fcvt_r(x, n, pt, sign, buf); }
# if !defined (_STLP_NO_LONG_DOUBLE)
static inline char* _Stl_ecvtR(long double x, int n, int* pt, int* sign, char* buf)
{ return qecvt_r(x, n, pt, sign, buf); }
static inline char* _Stl_fcvtR(long double x, int n, int* pt, int* sign, char* buf)
{ return qfcvt_r(x, n, pt, sign, buf); }
# endif
# elif defined (_STLP_MSVC_LIB) || defined (__MINGW32__) || defined (__BORLANDC__)
# if defined (_STLP_USE_SAFE_STRING_FUNCTIONS)
# define _STLP_APPEND(a, b) a##b
# define _STLP_BUF_PARAMS , char* buf, size_t bsize
# define _STLP_SECURE_FUN(F, X, N, PT, SIGN) _STLP_APPEND(F, _s)(buf, bsize, X, N, PT, SIGN); return buf
# else
# define _STLP_BUF_PARAMS
# define _STLP_SECURE_FUN(F, X, N, PT, SIGN) return F(X, N, PT, SIGN)
# define _STLP_CVT_NEED_SYNCHRONIZATION
# endif
static inline char* _Stl_ecvtR(double x, int n, int* pt, int* sign _STLP_BUF_PARAMS)
{ _STLP_SECURE_FUN(_ecvt, x, n, pt, sign); }
static inline char* _Stl_fcvtR(double x, int n, int* pt, int* sign _STLP_BUF_PARAMS)
{ _STLP_SECURE_FUN(_fcvt, x, n, pt, sign); }
# if !defined (_STLP_NO_LONG_DOUBLE)
# if defined (_STLP_USE_SAFE_STRING_FUNCTIONS)
# define _STLP_PARAMS , buf, bsize
# else
# define _STLP_PARAMS
# endif
static inline char* _Stl_ecvtR(long double x, int n, int* pt, int* sign _STLP_BUF_PARAMS)
{ return _Stl_ecvtR(__STATIC_CAST(double, x), n, pt, sign _STLP_PARAMS); }
static inline char* _Stl_fcvtR(long double x, int n, int* pt, int* sign _STLP_BUF_PARAMS)
{ return _Stl_fcvtR(__STATIC_CAST(double, x), n, pt, sign _STLP_PARAMS); }
# undef _STLP_PARAMS
# endif
# undef _STLP_SECURE_FUN
# undef _STLP_BUF_PARAMS
# undef _STLP_APPEND
# if defined (__BORLANDC__) /* || defined (__GNUC__) MinGW do not support 'L' modifier so emulation do not work */
# define _STLP_EMULATE_LONG_DOUBLE_CVT
# endif
# elif defined (__ISCPP__)
static inline char* _Stl_ecvtR(double x, int n, int* pt, int* sign, char* buf)
{ return _fp_ecvt( x, n, pt, sign, buf); }
static inline char* _Stl_fcvtR(double x, int n, int* pt, int* sign, char* buf)
{ return _fp_fcvt(x, n, pt, sign, buf); }
# if !defined (_STLP_NO_LONG_DOUBLE)
static inline char* _Stl_ecvtR(long double x, int n, int* pt, int* sign, char* buf)
{ return _fp_ecvt( x, n, pt, sign, buf); }
static inline char* _Stl_fcvtR(long double x, int n, int* pt, int* sign, char* buf)
{ return _fp_fcvt(x, n, pt, sign, buf); }
# endif
# elif defined (_AIX) || defined (__FreeBSD__) || defined (__NetBSD__) || defined (__OpenBSD__) || \
defined (__MRC__) || defined (__SC__) || defined (_CRAY) || \
defined (_STLP_SCO_OPENSERVER) || defined (__NCR_SVR) || \
defined (__DMC__)
static inline char* _Stl_ecvtR(double x, int n, int* pt, int* sign)
{ return ecvt(x, n, pt, sign ); }
static inline char* _Stl_fcvtR(double x, int n, int* pt, int* sign)
{ return fcvt(x, n, pt, sign); }
# if !defined (_STLP_NO_LONG_DOUBLE)
static inline char* _Stl_ecvtR(long double x, int n, int* pt, int* sign)
{ return ecvt(x, n, pt, sign ); }
static inline char* _Stl_fcvtR(long double x, int n, int* pt, int* sign)
{ return fcvt(x, n, pt, sign); }
# endif
# define _STLP_CVT_NEED_SYNCHRONIZATION
# else
# error Missing _Stl_ecvtR and _Stl_fcvtR implementations.
# endif
#if defined (_STLP_CVT_NEED_SYNCHRONIZATION)
/* STLport synchronize access to *cvt functions but those methods might
* be called from outside, in this case we will still have a race condition. */
# if defined (_STLP_THREADS)
static _STLP_STATIC_MUTEX& put_float_mutex() {
static _STLP_STATIC_MUTEX __put_float_mutex _STLP_MUTEX_INITIALIZER;
return __put_float_mutex;
}
static inline char* _Stl_ecvtR(double x, int n, int* pt, int* sign, char* buf) {
_STLP_auto_lock lock(put_float_mutex());
strcpy(buf, _Stl_ecvtR(x, n, pt, sign)); return buf;
}
static inline char* _Stl_fcvtR(double x, int n, int* pt, int* sign, char* buf) {
_STLP_auto_lock lock(put_float_mutex());
strcpy(buf, _Stl_fcvtR(x, n, pt, sign)); return buf;
}
# if !defined (_STLP_NO_LONG_DOUBLE) && !defined (_STLP_EMULATE_LONG_DOUBLE_CVT)
static inline char* _Stl_ecvtR(long double x, int n, int* pt, int* sign, char* buf) {
_STLP_auto_lock lock(put_float_mutex());
strcpy(buf, _Stl_ecvtR(x, n, pt, sign)); return buf;
}
static inline char* _Stl_fcvtR(long double x, int n, int* pt, int* sign, char* buf) {
_STLP_auto_lock lock(put_float_mutex());
strcpy(buf, _Stl_fcvtR(x, n, pt, sign)); return buf;
}
# endif
# else
static inline char* _Stl_ecvtR(double x, int n, int* pt, int* sign, char*)
{ return _Stl_ecvtR(x, n, pt, sign); }
static inline char* _Stl_fcvtR(double x, int n, int* pt, int* sign, char*)
{ return _Stl_fcvtR(x, n, pt, sign); }
# if !defined (_STLP_NO_LONG_DOUBLE) && !defined (_STLP_EMULATE_LONG_DOUBLE_CVT)
static inline char* _Stl_ecvtR(long double x, int n, int* pt, int* sign, char*)
{ return _Stl_ecvtR(x, n, pt, sign); }
static inline char* _Stl_fcvtR(long double x, int n, int* pt, int* sign, char*)
{ return _Stl_fcvtR(x, n, pt, sign); }
# endif
# endif
#endif
# if !defined (_STLP_USE_SAFE_STRING_FUNCTIONS) && !defined (_STLP_NEED_CVT_BUFFER_SIZE)
# define _STLP_CVT_BUFFER(B) B
# else
# define _STLP_CVT_BUFFER(B) _STLP_ARRAY_AND_SIZE(B)
# endif
# if defined (_STLP_EMULATE_LONG_DOUBLE_CVT)
static void __fill_fmtbuf(char* fmtbuf, ios_base::fmtflags flags, char long_modifier);
// Emulation of ecvt/fcvt functions using sprintf:
static char* _Stl_ecvtR(long double x, int n, int* pt, int* sign, char* buf) {
// If long double value can be safely converted to double without losing precision
// we use the ecvt function for double:
double y = __STATIC_CAST(double, x);
if (x == y)
return _Stl_ecvtR(y, n, pt, sign, buf);
char fmtbuf[32];
__fill_fmtbuf(fmtbuf, 0, 'L');
sprintf(buf, fmtbuf, n, x < 0.0l ? -x : x);
/* We are waiting for something having the form x.xxxe+yyyy */
*pt = 0;
*sign = 0;
int i = -1;
int offset = 0;
while (buf[++i] != 0 && n != 0) {
if (buf[i] >= '0' && buf[i] <= '9') {
--n;
if (offset != 0)
buf[i - offset] = buf[i];
}
else {
if (offset != 0) break;
++offset;
*pt = i;
}
}
if (offset != 0)
buf[i - offset] = 0;
// Extract exponent part in point position:
int e = 0;
while (buf[++i] != 0) {
if (buf[i] >= '0' && buf[i] <= '9') {
e = e * 10 + (buf[i] - '0');
}
}
*pt += e;
return buf;
}
static char* _Stl_fcvtR(long double x, int n, int* pt, int* sign, char* buf) {
// If long double value can be safely converted to double without losing precision
// we use the fcvt function for double:
double y = __STATIC_CAST(double, x);
if (x == y)
return _Stl_fcvtR(y, n, pt, sign, buf);
char fmtbuf[32];
__fill_fmtbuf(fmtbuf, ios_base::fixed, 'L');
sprintf(buf, fmtbuf, n, x < 0.0l ? -x : x);
*pt = 0;
*sign = 0;
int i = -1;
int offset = 0;
while (buf[++i] != 0 && (offset == 0 || n != 0)) {
if (buf[i] >= '0' && buf[i] <= '9') {
if (offset != 0) {
--n;
buf[i - offset] = buf[i];
}
}
else {
++offset;
*pt = i;
}
}
if (offset != 0)
buf[i - offset] = 0;
else
*pt = i;
return buf;
}
#endif
//----------------------------------------------------------------------
// num_put
// __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.
static size_t __format_float_scientific( __iostring& buf, const char *bp,
int decpt, int sign, bool is_zero,
ios_base::fmtflags flags,
int precision) {
// sign if required
if (sign)
buf += '-';
else if (flags & ios_base::showpos)
buf += '+';
// first digit of mantissa
buf += *bp++;
// start of grouping position, grouping won't occur in scientific notation
// as it is impossible to have something like 1234.0e04 but we return a correct
// group position for coherency with __format_float_fixed.
size_t __group_pos = buf.size();
// decimal point if required
if (precision != 0 || flags & ios_base::showpoint) {
buf += '.';
}
// rest of mantissa
while (*bp != 0 && precision--)
buf += *bp++;
// trailing 0 if needed
if (precision > 0)
buf.append(precision, '0');
// exponent size = number of digits + exponent sign + exponent symbol + trailing zero
char expbuf[MAXEDIGITS + 3];
//We start filling at the buffer end
char *suffix = expbuf + MAXEDIGITS + 2;
*suffix = 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
// C89 Standard says that it should be at least 2 digits, C99 Standard says that
// we stop prepend zeros if more than 3 digits. To repect both STLport prepend zeros
// until it is 2 digits.
while (suffix > &expbuf[MAXEDIGITS])
*--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
buf += suffix;
return __group_pos;
}
static size_t __format_float_fixed( __iostring &buf, const char *bp,
int decpt, int sign,
ios_base::fmtflags flags,
int precision) {
if ( sign && (decpt > -precision) && (*bp != 0) )
buf += '-';
else if ( flags & ios_base::showpos )
buf += '+';
// digits before decimal point
int nnn = decpt;
do {
buf += (nnn <= 0 || *bp == 0) ? '0' : *bp++;
} while ( --nnn > 0 );
// start of grouping position
size_t __group_pos = buf.size();
// decimal point if needed
if ( flags & ios_base::showpoint || precision > 0 ) {
buf += '.';
}
// digits after decimal point if any
while ( *bp != 0 && --precision >= 0 ) {
buf += (++decpt <= 0) ? '0' : *bp++;
}
// trailing zeros if needed
if (precision > 0)
buf.append(precision, '0');
return __group_pos;
}
#if defined (_STLP_USE_SIGN_HELPER)
template<class _FloatT>
struct float_sign_helper {
float_sign_helper(_FloatT __x)
{ _M_number._num = __x; }
bool is_negative() const {
const unsigned short sign_mask(1 << (sizeof(unsigned short) * CHAR_BIT - 1));
return (get_sign_word() & sign_mask) != 0;
}
private:
union {
unsigned short _Words[8];
_FloatT _num;
} _M_number;
unsigned short get_word_higher() const _STLP_NOTHROW
{ return _M_number._Words[0]; }
unsigned short get_word_lower() const _STLP_NOTHROW
{ return _M_number._Words[(sizeof(_FloatT) >= 12 ? 10 : sizeof(_FloatT)) / sizeof(unsigned short) - 1]; }
unsigned short get_sign_word() const _STLP_NOTHROW
# if defined (_STLP_BIG_ENDIAN)
{ return get_word_higher(); }
# else /* _STLP_LITTLE_ENDIAN */
{ return get_word_lower(); }
# endif
};
#endif
template <class _FloatT>
static size_t __format_nan_or_inf(__iostring& buf, _FloatT x, ios_base::fmtflags flags) {
static const char* inf[2] = { "inf", "Inf" };
static const char* nan[2] = { "nan", "NaN" };
const char** inf_or_nan;
#if !defined (_STLP_USE_SIGN_HELPER)
if (_Stl_is_inf(x)) { // Infinity
inf_or_nan = inf;
if (_Stl_is_neg_inf(x))
buf += '-';
else if (flags & ios_base::showpos)
buf += '+';
} else { // NaN
inf_or_nan = nan;
if (_Stl_is_neg_nan(x))
buf += '-';
else if (flags & ios_base::showpos)
buf += '+';
}
#else
typedef numeric_limits<_FloatT> limits;
if (x == limits::infinity() || x == -limits::infinity()) {
inf_or_nan = inf;
} else { // NaN
inf_or_nan = nan;
}
float_sign_helper<_FloatT> helper(x);
if (helper.is_negative())
buf += '-';
else if (flags & ios_base::showpos)
buf += '+';
#endif
size_t ret = buf.size();
buf += inf_or_nan[flags & ios_base::uppercase ? 1 : 0];
return ret;
}
static inline size_t __format_float(__iostring &buf, const char * bp,
int decpt, int sign, bool is_zero,
ios_base::fmtflags flags,
int precision) {
size_t __group_pos = 0;
switch (flags & ios_base::floatfield) {
case ios_base::scientific:
__group_pos = __format_float_scientific( buf, bp, decpt, sign, is_zero,
flags, precision);
break;
case ios_base::fixed:
__group_pos = __format_float_fixed( buf, bp, decpt, sign,
flags, precision);
break;
default: // g format
// establish default precision
if (flags & ios_base::showpoint || precision > 0) {
if (precision == 0) precision = 1;
} else
precision = 6;
// reset exponent if value is zero
if (is_zero)
decpt = 1;
int kk = precision;
if (!(flags & ios_base::showpoint)) {
size_t n = strlen(bp);
if (n < (size_t)kk)
kk = (int)n;
while (kk >= 1 && bp[kk-1] == '0')
--kk;
}
if (decpt < -3 || decpt > precision) {
precision = kk - 1;
__group_pos = __format_float_scientific( buf, bp, decpt, sign, is_zero,
flags, precision);
} else {
precision = kk - decpt;
__group_pos = __format_float_fixed( buf, bp, decpt, sign,
flags, precision);
}
break;
} /* switch */
return __group_pos;
}
#endif
#if defined (USE_SPRINTF_INSTEAD) || defined (_STLP_EMULATE_LONG_DOUBLE_CVT)
struct GroupPos {
bool operator () (char __c) const {
return __c == '.' ||
__c == 'e' || __c == 'E';
}
};
// Creates a format string for sprintf()
static void __fill_fmtbuf(char* fmtbuf, ios_base::fmtflags flags, char long_modifier) {
fmtbuf[0] = '%';
int i = 1;
if (flags & ios_base::showpos)
fmtbuf[i++] = '+';
if (flags & ios_base::showpoint)
fmtbuf[i++] = '#';
fmtbuf[i++] = '.';
fmtbuf[i++] = '*';
if (long_modifier)
fmtbuf[i++] = long_modifier;
switch (flags & ios_base::floatfield)
{
case ios_base::scientific:
fmtbuf[i++] = (flags & ios_base::uppercase) ? 'E' : 'e';
break;
case ios_base::fixed:
# if defined (__FreeBSD__)
fmtbuf[i++] = 'f';
# else
fmtbuf[i++] = (flags & ios_base::uppercase) ? 'F' : 'f';
# endif
break;
default:
fmtbuf[i++] = (flags & ios_base::uppercase) ? 'G' : 'g';
break;
}
fmtbuf[i] = 0;
}
#endif /* USE_SPRINTF_INSTEAD */
template <class _FloatT>
static size_t __write_floatT(__iostring &buf, ios_base::fmtflags flags, int precision,
_FloatT x
#if defined (USE_SPRINTF_INSTEAD)
, char modifier) {
/* In theory, if we want 'arbitrary' precision, we should use 'arbitrary'
* buffer size below, but really we limited by exponent part in double.
* - ptr
*/
typedef numeric_limits<_FloatT> limits;
char static_buf[limits::max_exponent10 + 6]; // 6: -xxx.yyyE-zzz (sign, dot, E, exp sign, \0)
char fmtbuf[32];
__fill_fmtbuf(fmtbuf, flags, modifier);
snprintf(_STLP_ARRAY_AND_SIZE(static_buf), fmtbuf, precision, x);
buf = static_buf;
return find_if(buf.begin(), buf.end(), GroupPos()) - buf.begin();
#else
) {
typedef numeric_limits<_FloatT> limits;
//If numeric_limits support is correct we use the exposed values to detect NaN and infinity:
if (limits::has_infinity && limits::has_quiet_NaN) {
if (!(x == x) || // NaN check
(x == limits::infinity() || x == -limits::infinity())) {
return __format_nan_or_inf(buf, x, flags);
}
}
// numeric_limits support is not good enough, we rely on platform dependent function
// _Stl_is_nan_or_inf that do not support long double.
else if (_Stl_is_nan_or_inf(x)) {
return __format_nan_or_inf(buf, x, flags);
}
# if defined (__MINGW32__)
//For the moment MinGW is limited to display at most numeric_limits<double>::max()
if (x > numeric_limits<double>::max() ||
x < -numeric_limits<double>::max()) {
return __format_nan_or_inf(buf, x, flags);
}
# endif
/* Buffer size is max number of digits which is the addition of:
* - max_exponent10: max number of digits in fixed mode
* - digits10 + 2: max number of significant digits
* - trailing '\0'
*/
char cvtbuf[limits::max_exponent10 + limits::digits10 + 2 + 1];
char *bp;
int decpt, sign;
switch (flags & ios_base::floatfield) {
case ios_base::fixed:
{
/* Here, number of digits represents digits _after_ decimal point.
* In order to limit static buffer size we have to give 2 different values depending on x value.
* For small values (abs(x) < 1) we need as many digits as requested by precision limited by the maximum number of digits
* which is min_exponent10 + digits10 + 2
* For bigger values we won't have more than limits::digits10 + 2 digits after decimal point. */
int digits10 = (x > -1.0 && x < 1.0 ? -limits::min_exponent10 + limits::digits10 + 2
: limits::digits10 + 2);
bp = _Stl_fcvtR(x, (min) (precision, digits10), &decpt, &sign, _STLP_CVT_BUFFER(cvtbuf) );
}
break;
case ios_base::scientific:
default:
/* Here, number of digits is total number of digits which is limited to digits10 + 2. */
{
int digits10 = limits::digits10 + 2;
bp = _Stl_ecvtR(x, (min) (precision, digits10), &decpt, &sign, _STLP_CVT_BUFFER(cvtbuf) );
}
break;
}
return __format_float(buf, bp, decpt, sign, x == 0.0, flags, precision);
#endif
}
size_t _STLP_CALL
__write_float(__iostring &buf, ios_base::fmtflags flags, int precision,
double x) {
return __write_floatT(buf, flags, precision, x
#if defined (USE_SPRINTF_INSTEAD)
, 0
#endif
);
}
#if !defined (_STLP_NO_LONG_DOUBLE)
size_t _STLP_CALL
__write_float(__iostring &buf, ios_base::fmtflags flags, int precision,
long double x) {
return __write_floatT(buf, flags, precision, x
#if defined (USE_SPRINTF_INSTEAD)
, 'L'
#endif
);
}
#endif
void _STLP_CALL __get_floor_digits(__iostring &out, _STLP_LONGEST_FLOAT_TYPE __x) {
typedef numeric_limits<_STLP_LONGEST_FLOAT_TYPE> limits;
#if defined (USE_SPRINTF_INSTEAD)
char cvtbuf[limits::max_exponent10 + 6];
# if !defined (_STLP_NO_LONG_DOUBLE)
snprintf(_STLP_ARRAY_AND_SIZE(cvtbuf), "%Lf", __x); // check for 1234.56!
# else
snprintf(_STLP_ARRAY_AND_SIZE(cvtbuf), "%f", __x); // check for 1234.56!
# endif
char *p = strchr( cvtbuf, '.' );
if ( p == 0 ) {
out.append( cvtbuf );
} else {
out.append( cvtbuf, p );
}
#else
char cvtbuf[limits::max_exponent10 + 1];
char * bp;
int decpt, sign;
bp = _Stl_fcvtR(__x, 0, &decpt, &sign, _STLP_CVT_BUFFER(cvtbuf));
if (sign) {
out += '-';
}
out.append(bp, bp + decpt);
#endif
}
#if !defined (_STLP_NO_WCHAR_T)
void _STLP_CALL __convert_float_buffer( __iostring const& str, __iowstring &out,
const ctype<wchar_t>& ct, wchar_t dot, bool __check_dot) {
string::const_iterator str_ite(str.begin()), str_end(str.end());
//First loop, check the dot char
if (__check_dot) {
while (str_ite != str_end) {
if (*str_ite != '.') {
out += ct.widen(*str_ite++);
} else {
out += dot;
break;
}
}
} else {
if (str_ite != str_end) {
out += ct.widen(*str_ite);
}
}
if (str_ite != str_end) {
//Second loop, dot has been found, no check anymore
while (++str_ite != str_end) {
out += ct.widen(*str_ite);
}
}
}
#endif
void _STLP_CALL
__adjust_float_buffer(__iostring &str, char dot) {
if ('.' != dot) {
size_t __dot_pos = str.find('.');
if (__dot_pos != string::npos) {
str[__dot_pos] = dot;
}
}
}
_STLP_MOVE_TO_STD_NAMESPACE
_STLP_END_NAMESPACE
// Local Variables:
// mode:C++
// End: