libcruft-util/stream.cpp

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/*
* This file is part of libgim.
*
* libgim 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 3 of the License, or (at your option) any later
* version.
*
* libgim 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 libgim. If not, see <http://www.gnu.org/licenses/>.
*
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* Copyright 2010 Danny Robson <danny@nerdcruft.net>
*/
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#include "stream.hpp"
#include "debug.hpp"
using util::stream::null;
using util::stream::bits;
//-----------------------------------------------------------------------------
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std::ostream&
null::put (char)
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{ return *this; }
//-----------------------------------------------------------------------------
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bool
null::good (void) const
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{ return !bad () && !eof () && !fail (); }
//-----------------------------------------------------------------------------
bool null::bad (void) const { return false; }
bool null::eof (void) const { return false; }
bool null::fail (void) const { return false; }
//-----------------------------------------------------------------------------
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;
}