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#ifndef _RHEO_ALL_FLOAT_IO_H
#define _RHEO_ALL_FLOAT_IO_H
///
/// This file is part of Rheolef.
///
/// Copyright (C) 2000-2009 Pierre Saramito <Pierre.Saramito@imag.fr>
///
/// Rheolef 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 of the License, or
/// (at your option) any later version.
///
/// Rheolef 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 Rheolef; if not, write to the Free Software
/// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
///
/// =========================================================================
//
// generic inputs/outputs for floats
//
// author: Pierre.Saramito@imag.fr
//
// date: 25 january 2000
//
// IMPLEMENTATION NOTE:
// requires some minimal math library
// on generic type T : log10(), ...
//
// TODO: ostream
// knows setprecision(n) but
// does not respond to
// ios::scientific
// ios::fixed
// ios::showpoint
//
// cf. glibc-2.1.2/stdio-common/printf_fp.c
//
// gcc-2.95.2/libio/iostream.c
// gcc-2.95.2/libio/outfloat.c
// gcc-2.95.2/libio/floatconv.c
//
template<class T>
std::istream&
all_float_read (std::istream& s, T& x)
{
int sign = 1;
char c;
s >> std::ws; // eat whitespace
s >> c;
// check for stream
if (s.eof()) s.setstate (std::ios::failbit);
if (s.fail()) return s;
if (c == '-') {
sign = -1;
s >> c;
} else if (c == '+') {
s >> c;
}
// get digits before decimal point
int n = c - '0';
int ex = 0;
T y = 0;
while (n >= 0 && n < 10) {
y = 10*y + n;
s.get(c); // cannot use s>>c; as that will eat whitespace
if (isspace(c)) { goto fixup; }
n = c - '0';
}
if (c == '.') { // get digits after decimal point
s.get(c); // cannot use s>>c; as that will eat whitespace
if (isspace(c)) {
goto fixup;
}
n = c - '0';
while (n >= 0 && n < 10) {
y = 10*y + n;
s.get(c);
n = c - '0';
--ex;
if (isspace(c)) {
goto fixup;
}
}
}
n = 0;
if (c == 'e' || c == 'E' ||
c == 'd' || c == 'D' || c == 'L') {
s >> n;
ex += n; // get exponent
} else {
s.putback(c);
}
fixup:
if (sign < 0) {
y = -y;
}
// exponent adjustment
while (ex-- > 0) y *= 10;
while (++ex < 0) y /= 10;
x = y;
return s;
}
template <class T>
std::ostream&
all_float_write (std::ostream& s, const T& x)
{
if (numeric_flags<T>::output_as_double()) {
// i.e. for non-regression tests purpose
return s << double(x);
}
if (x == 0) {
s << "0";
return s;
}
T ten = 10;
T y = fabs(x);
T q = log10(y);
int n = int(floor(q));
if (n < 0) {
n++;
}
T l = pow(ten,n);
y = y/l;
#ifdef TO_CLEAN
long showpos = (s.flags() & std::ios::showpos);
s.unsetf(std::ios::showpos);
#endif // TO_CLEAN
if (x < 0) {
s << "-";
#ifdef TO_CLEAN
} else if (showpos) {
s << "+";
#endif // TO_CLEAN
}
// num of decimals in 3..N
int prec = s.precision();
int digits10 = std::numeric_limits<T>::digits10;
int d = ((prec > digits10) ? digits10 : prec);
d = ((d < 3) ? 3 : d);
for (int i = 1; i <= d; i++) {
if (i == 2) {
s << ".";
}
int m = int(floor(y));
if (m < 0 || m > 9) {
std::cerr << "fatal(genfloat_io): digit = " << m
<< " founded in ostream& operator <<" << std::endl;
exit (1);
}
s << m;
y = (y - T(m))*ten;
if (y <= 0) break; // x must be an integer
}
// restaure optional showpos flag (used for exponent part)
#ifdef TO_CLEAN
s.setf(std::ios::showpos);
#endif // TO_CLEAN
if (n != 0) {
char E = ((s.flags() & std::ios::uppercase) ? 'E' : 'e');
s << E << n;
} else {
s << "";
}
s << "";
return s;
}
#endif // _RHEO_ALL_FLOAT_IO_H
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