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/*
* Copyright (C) 2003-2014 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/StringUtil.hxx"
#include "util/Error.hxx"
#include "Log.hxx"
#include <assert.h>
#include <string.h>
char *
TextInputStream::ReadBufferedLine()
{
auto r = buffer.Read();
char *newline = reinterpret_cast<char*>(memchr(r.data, '\n', r.size));
if (newline == nullptr)
return nullptr;
buffer.Consume(newline + 1 - r.data);
char *end = StripRight(r.data, newline);
*end = 0;
return r.data;
}
char *
TextInputStream::ReadLine()
{
char *line = ReadBufferedLine();
if (line != nullptr)
return line;
while (true) {
auto dest = buffer.Write();
if (dest.size < 2) {
/* end of file (or 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;
Error error;
size_t nbytes = is.LockRead(dest.data, dest.size, error);
if (nbytes > 0)
buffer.Append(nbytes);
else if (error.IsDefined()) {
LogError(error);
return nullptr;
}
line = ReadBufferedLine();
if (line != nullptr)
return line;
if (nbytes == 0)
return nullptr;
}
}
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