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61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
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/*
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* \brief Simple console for debug output
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* \author Norman Feske
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* \date 2006-04-07
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*/
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/*
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* Copyright (C) 2006-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__FORMAT__CONSOLE_H_
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#define _INCLUDE__FORMAT__CONSOLE_H_
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#include <stdarg.h>
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namespace Format { class Console; }
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class Format::Console
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{
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public:
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virtual ~Console() {}
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/**
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* Print format string
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*/
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void printf(const char *format, ...) __attribute__((format(printf, 2, 3)));
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void vprintf(const char *format, va_list) __attribute__((format(printf, 2, 0)));
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protected:
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/**
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* Back end used for the output of a single character
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*/
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virtual void _out_char(char c) = 0;
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/**
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* Back end for the output of a null-terminated string
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*
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* The default implementation uses _out_char. This method may
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* be overridden by the backend for improving efficiency.
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*
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* This method is virtual to enable the use an optimized
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* string-output operation on some target platforms, e.g.,
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* a kernel debugger that offers a string-output syscall. The
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* default implementation calls '_out_char' for each character.
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*/
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virtual void _out_string(const char *str);
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private:
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template <typename T> void _out_unsigned(T value, unsigned base = 10, int pad = 0);
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template <typename T> void _out_signed(T value, unsigned base = 10);
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};
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#endif /* _INCLUDE__FORMAT__CONSOLE_H_ */
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