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/*
* Copyright 2003-2016 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "TextInputStream.hxx"
#include "InputStream.hxx"
#include "util/TextFile.hxx"
#include "Log.hxx"
#include <stdexcept>
#include <assert.h>
TextInputStream::TextInputStream(InputStreamPtr &&_is)
:is(std::move(_is)) {}
TextInputStream::~TextInputStream() {}
char *
TextInputStream::ReadLine()
{
char *line = ReadBufferedLine(buffer);
if (line != nullptr)
return line;
buffer.Shift();
while (true) {
auto dest = buffer.Write();
if (dest.size < 2) {
/* line too long: terminate the current
line */
assert(!dest.IsEmpty());
dest[0] = 0;
line = buffer.Read().data;
buffer.Clear();
return line;
}
/* reserve one byte for the null terminator if the
last line is not terminated by a newline
character */
--dest.size;
size_t nbytes;
try {
nbytes = is->LockRead(dest.data, dest.size);
} catch (const std::runtime_error &e) {
LogError(e);
return nullptr;
}
buffer.Append(nbytes);
line = ReadBufferedLine(buffer);
if (line != nullptr)
return line;
if (nbytes == 0) {
/* end of file: see if there's an unterminated
line */
dest = buffer.Write();
assert(!dest.IsEmpty());
dest[0] = 0;
auto r = buffer.Read();
buffer.Clear();
return r.IsEmpty()
? nullptr
: r.data;
}
}
}
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