The GtkRadiant sources as originally released under the GPL license.

radiant/console.h

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+/*
+Copyright (C) 1999-2006 Id Software, Inc. and contributors.
+For a list of contributors, see the accompanying CONTRIBUTORS file.
+
+This file is part of GtkRadiant.
+
+GtkRadiant 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.
+
+GtkRadiant 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 GtkRadiant; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#if !defined(INCLUDED_CONSOLE_H)
+#define INCLUDED_CONSOLE_H
+
+#include <cstddef>
+
+#define SYS_VRB 0 ///< verbose support (on/off)
+#define SYS_STD 1 ///< standard print level - this is the default
+#define SYS_WRN 2 ///< warnings
+#define SYS_ERR 3 ///< error
+#define SYS_NOCON 4 ///< no console, only print to the file (useful whenever Sys_Printf and output IS the problem)
+
+std::size_t Sys_Print(int level, const char* buf, std::size_t length);
+class TextOutputStream;
+TextOutputStream& getSysPrintOutputStream();
+TextOutputStream& getSysPrintErrorStream();
+
+typedef struct _GtkWidget GtkWidget;
+typedef struct _GtkWindow GtkWindow;
+GtkWidget* Console_constructWindow(GtkWindow* toplevel);
+
+// will open/close the log file based on the parameter
+void Sys_LogFile(bool enable);
+extern bool g_Console_enableLogging;
+
+
+#endif