genode/repos/gems/src/app/launcher/types.h
Norman Feske 17c79a9e23 base: avoid use of deprecated base/printf.h
Besides adapting the components to the use of base/log.h, the patch
cleans up a few base headers, i.e., it removes unused includes from
root/component.h, specifically base/heap.h and
ram_session/ram_session.h. Hence, components that relied on the implicit
inclusion of those headers have to manually include those headers now.

While adjusting the log messages, I repeatedly stumbled over the problem
that printing char * arguments is ambiguous. It is unclear whether to
print the argument as pointer or null-terminated string. To overcome
this problem, the patch introduces a new type 'Cstring' that allows the
caller to express that the argument should be handled as null-terminated
string. As a nice side effect, with this type in place, the optional len
argument of the 'String' class could be removed. Instead of supplying a
pair of (char const *, size_t), the constructor accepts a 'Cstring'.
This, in turn, clears the way let the 'String' constructor use the new
output mechanism to assemble a string from multiple arguments (and
thereby getting rid of snprintf within Genode in the near future).

To enforce the explicit resolution of the char * ambiguity, the 'char *'
overload of the 'print' function is marked as deleted.

Issue #1987
2016-08-29 17:27:10 +02:00

46 lines
1.1 KiB
C++

/*
* \brief Common types for launcher
* \author Norman Feske
* \date 2014-09-30
*/
/*
* Copyright (C) 2014 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _TYPES_H_
#define _TYPES_H_
/* Genode includes */
#include <decorator/xml_utils.h>
#include <nitpicker_session/nitpicker_session.h>
namespace Launcher {
using namespace Genode;
typedef String<128> Label;
static Nitpicker::Session::Label selector(Label label)
{
/*
* Append label separator to uniquely identify the subsystem.
* Otherwise, the selector may be ambiguous if the label of one
* subsystem starts with the label of another subsystem.
*/
char selector[Nitpicker::Session::Label::size()];
snprintf(selector, sizeof(selector), "%s ->", label.string());
return Nitpicker::Session::Label(Cstring(selector));
}
using Decorator::area_attribute;
using Decorator::point_attribute;
typedef Nitpicker::Point Point;
typedef Nitpicker::Rect Rect;
}
#endif /* _TYPES_H_ */