87 lines
2.1 KiB
C++
87 lines
2.1 KiB
C++
/*
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* Copyright (C) 2003-2014 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 "config.h"
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#include "TextInputStream.hxx"
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#include "InputStream.hxx"
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#include "util/Error.hxx"
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#include "Log.hxx"
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#include <assert.h>
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#include <string.h>
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char *
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TextInputStream::ReadBufferedLine()
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{
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auto r = buffer.Read();
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char *newline = reinterpret_cast<char*>(memchr(r.data, '\n', r.size));
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if (newline == nullptr)
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return nullptr;
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buffer.Consume(newline + 1 - r.data);
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if (newline > r.data && newline[-1] == '\r')
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--newline;
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*newline = 0;
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return r.data;
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}
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char *
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TextInputStream::ReadLine()
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{
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char *line = ReadBufferedLine();
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if (line != nullptr)
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return line;
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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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/* end of file (or line too long): terminate
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the current line */
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assert(!dest.IsEmpty());
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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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Error error;
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size_t nbytes = is.LockRead(dest.data, dest.size, error);
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if (nbytes > 0)
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buffer.Append(nbytes);
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else if (error.IsDefined()) {
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LogError(error);
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return nullptr;
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}
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line = ReadBufferedLine();
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if (line != nullptr)
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return line;
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if (nbytes == 0)
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return nullptr;
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}
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}
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