libcruft-util/stream.cpp
Danny Robson f6056153e3 rename root namespace from util to cruft
This places, at long last, the core library code into the same namespace
as the extended library code.
2018-08-05 14:42:02 +10:00

114 lines
2.7 KiB
C++

/*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* Copyright 2010 Danny Robson <danny@nerdcruft.net>
*/
#include "stream.hpp"
#include "debug.hpp"
#include <ostream>
using cruft::stream::null_ostream;
using cruft::stream::bits;
///////////////////////////////////////////////////////////////////////////////
cruft::stream::scoped::flags::flags (std::ios_base &_ios):
m_ios (_ios),
m_state (_ios.flags ())
{ ; }
//-----------------------------------------------------------------------------
cruft::stream::scoped::flags::~flags ()
{
m_ios.flags (m_state);
}
///////////////////////////////////////////////////////////////////////////////
cruft::stream::scoped::precision::precision (std::ios_base &_ios):
m_ios (_ios),
m_state (_ios.precision ())
{ ; }
//-----------------------------------------------------------------------------
cruft::stream::scoped::precision::~precision ()
{
m_ios.precision (m_state);
}
///////////////////////////////////////////////////////////////////////////////
cruft::stream::scoped::width::width (std::ios_base &_ios):
m_ios (_ios),
m_state (_ios.width ())
{ ; }
//-----------------------------------------------------------------------------
cruft::stream::scoped::width::~width ()
{
m_ios.width (m_state);
}
///////////////////////////////////////////////////////////////////////////////
std::ostream&
null_ostream::put (char)
{
return *this;
}
//-----------------------------------------------------------------------------
bool
null_ostream::good (void) const
{
return !bad () && !eof () && !fail ();
}
//-----------------------------------------------------------------------------
bool null_ostream::bad (void) const { return false; }
bool null_ostream::eof (void) const { return false; }
bool null_ostream::fail (void) const { return false; }
///////////////////////////////////////////////////////////////////////////////
bits::bits (uintmax_t _value, unsigned _count):
value (_value),
count (_count)
{
CHECK_LE (count, sizeof(value) * 8);
}
//-----------------------------------------------------------------------------
std::ostream&
cruft::stream::operator<< (std::ostream &os, cruft::stream::bits b) {
char digits[sizeof (b.value) * 8 + 1] = { 0 };
char *cursor = std::end (digits) - 1;
uintmax_t bits = b.value;
unsigned count = b.count;
while (count) {
CHECK_GE (cursor, digits);
--cursor;
*cursor = (bits & 0x01) ? '1' : '0';
bits >>= 1;
count -= 1;
}
os << cursor << "/" << b.count;
return os;
}