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-rw-r--r--src/fs/io/BufferedReader.cxx82
1 files changed, 82 insertions, 0 deletions
diff --git a/src/fs/io/BufferedReader.cxx b/src/fs/io/BufferedReader.cxx
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index 000000000..ba2f17dcf
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+++ b/src/fs/io/BufferedReader.cxx
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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 "BufferedReader.hxx"
+#include "Reader.hxx"
+#include "util/TextFile.hxx"
+
+bool
+BufferedReader::Fill(bool need_more)
+{
+ if (gcc_unlikely(last_error.IsDefined()))
+ return false;
+
+ if (eof)
+ return !need_more;
+
+ auto w = buffer.Write();
+ if (w.IsEmpty()) {
+ if (buffer.GetCapacity() >= MAX_SIZE)
+ return !need_more;
+
+ buffer.Grow(buffer.GetCapacity() * 2);
+ w = buffer.Write();
+ assert(!w.IsEmpty());
+ }
+
+ size_t nbytes = reader.Read(w.data, w.size, last_error);
+ if (nbytes == 0) {
+ if (gcc_unlikely(last_error.IsDefined()))
+ return false;
+
+ eof = true;
+ return !need_more;
+ }
+
+ buffer.Append(nbytes);
+ return true;
+}
+
+char *
+BufferedReader::ReadLine()
+{
+ do {
+ char *line = ReadBufferedLine(buffer);
+ if (line != nullptr)
+ return line;
+ } while (Fill(true));
+
+ if (last_error.IsDefined() || !eof || buffer.IsEmpty())
+ return nullptr;
+
+ auto w = buffer.Write();
+ if (w.IsEmpty()) {
+ buffer.Grow(buffer.GetCapacity() + 1);
+ w = buffer.Write();
+ assert(!w.IsEmpty());
+ }
+
+ /* terminate the last line */
+ w[0] = 0;
+
+ char *line = buffer.Read().data;
+ buffer.Clear();
+ return line;
+}