82 lines
1.9 KiB
C++
82 lines
1.9 KiB
C++
/*
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* Copyright 2003-2021 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "TextInputStream.hxx"
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#include "InputStream.hxx"
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#include "util/TextFile.hxx"
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#include <cassert>
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TextInputStream::TextInputStream(InputStreamPtr &&_is) noexcept
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:is(std::move(_is)) {}
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TextInputStream::~TextInputStream() noexcept = default;
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char *
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TextInputStream::ReadLine()
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{
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char *line = ReadBufferedLine(buffer);
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if (line != nullptr)
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return line;
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buffer.Shift();
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while (true) {
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auto dest = buffer.Write();
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if (dest.size < 2) {
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/* line too long: terminate the current
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line */
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assert(!dest.empty());
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dest[0] = 0;
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line = buffer.Read().data;
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buffer.Clear();
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return line;
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}
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/* reserve one byte for the null terminator if the
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last line is not terminated by a newline
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character */
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--dest.size;
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size_t nbytes = is->LockRead(dest.data, dest.size);
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buffer.Append(nbytes);
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line = ReadBufferedLine(buffer);
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if (line != nullptr)
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return line;
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if (nbytes == 0) {
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/* end of file: see if there's an unterminated
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line */
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dest = buffer.Write();
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assert(!dest.empty());
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dest[0] = 0;
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auto r = buffer.Read();
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buffer.Clear();
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return r.empty()
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? nullptr
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: r.data;
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}
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}
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}
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