libcruft-util/stream.cpp

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/*
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* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
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* http://www.apache.org/licenses/LICENSE-2.0
*
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* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
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* Copyright 2010 Danny Robson <danny@nerdcruft.net>
*/
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#include "stream.hpp"
#include "debug.hpp"
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#include <ostream>
using util::stream::null_ostream;
using util::stream::bits;
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///////////////////////////////////////////////////////////////////////////////
util::stream::scoped::flags::flags (std::ios_base &_ios):
m_ios (_ios),
m_state (_ios.flags ())
{ ; }
//-----------------------------------------------------------------------------
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util::stream::scoped::flags::~flags ()
{
m_ios.flags (m_state);
}
///////////////////////////////////////////////////////////////////////////////
util::stream::scoped::precision::precision (std::ios_base &_ios):
m_ios (_ios),
m_state (_ios.precision ())
{ ; }
//-----------------------------------------------------------------------------
util::stream::scoped::precision::~precision ()
{
m_ios.precision (m_state);
}
///////////////////////////////////////////////////////////////////////////////
util::stream::scoped::width::width (std::ios_base &_ios):
m_ios (_ios),
m_state (_ios.width ())
{ ; }
//-----------------------------------------------------------------------------
util::stream::scoped::width::~width ()
{
m_ios.width (m_state);
}
///////////////////////////////////////////////////////////////////////////////
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std::ostream&
null_ostream::put (char)
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{
return *this;
}
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//-----------------------------------------------------------------------------
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bool
null_ostream::good (void) const
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{
return !bad () && !eof () && !fail ();
}
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//-----------------------------------------------------------------------------
bool null_ostream::bad (void) const { return false; }
bool null_ostream::eof (void) const { return false; }
bool null_ostream::fail (void) const { return false; }
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///////////////////////////////////////////////////////////////////////////////
bits::bits (uintmax_t _value, unsigned _count):
value (_value),
count (_count)
{
CHECK_LE (count, sizeof(value) * 8);
}
//-----------------------------------------------------------------------------
std::ostream&
util::stream::operator<< (std::ostream &os, util::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';
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bits >>= 1;
count -= 1;
}
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os << cursor << "/" << b.count;
return os;
}