libcruft-util/stream.cpp
2017-01-05 20:21:03 +11:00

77 lines
2.0 KiB
C++

/*
* 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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.
*
* Copyright 2010 Danny Robson <danny@nerdcruft.net>
*/
#include "stream.hpp"
#include "debug.hpp"
using util::stream::null_ostream;
using util::stream::bits;
//-----------------------------------------------------------------------------
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&
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';
bits >>= 1;
count -= 1;
}
os << cursor << "/" << b.count;
return os;
}