126 lines
2.3 KiB
C++
126 lines
2.3 KiB
C++
/*
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* \brief Printf backend for the LOG interface
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* \author Norman Feske
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* \date 2006-09-15
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*/
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/*
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* Copyright (C) 2006-2012 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 General Public License version 2.
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*/
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#include <log_session/connection.h>
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#include <base/printf.h>
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#include <base/console.h>
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#include <base/lock.h>
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#include <base/env.h>
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using namespace Genode;
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class Log_console : public Console
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{
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private:
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enum { _BUF_SIZE = 216 };
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Log_connection _log;
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char _buf[_BUF_SIZE];
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unsigned _num_chars;
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Lock _lock;
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void _flush()
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{
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/* null-terminate string */
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_buf[_num_chars] = 0;
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_log.write(_buf);
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/* restart with empty buffer */
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_num_chars = 0;
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}
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protected:
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void _out_char(char c)
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{
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/* ensure enough buffer space for complete escape sequence */
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if ((c == 27) && (_num_chars + 8 > _BUF_SIZE)) _flush();
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_buf[_num_chars++] = c;
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/* flush immediately on line break */
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if (c == '\n' || _num_chars >= sizeof(_buf) - 1)
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_flush();
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}
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public:
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/**
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* Constructor
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*/
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Log_console()
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:
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_num_chars(0)
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{ }
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/**
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* Console interface
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*/
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void vprintf(const char *format, va_list list)
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{
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Lock::Guard lock_guard(_lock);
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Console::vprintf(format, list);
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}
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/**
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* Return LOG session interface
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*/
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Log_session *log_session() { return &_log; }
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};
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/*
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* In the presence of a libC, we use the libC's full printf implementation and
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* use the 'Log_console' as backend.
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*/
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Log_console *stdout_log_console()
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{
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/*
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* Construct the log console object on the first call of this function.
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* In constrast to having a static variable in the global scope, the
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* constructor gets only called when needed and no static constructor
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* gets invoked by the initialization code.
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*/
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static Log_console static_log_console;
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return &static_log_console;
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}
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/**
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* Hook for supporting libC back ends for stdio
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*/
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extern "C" int stdout_write(const char *s)
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{
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return stdout_log_console()->log_session()->write(s);
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}
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void Genode::printf(const char *format, ...)
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{
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va_list list;
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va_start(list, format);
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vprintf(format, list);
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va_end(list);
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}
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void Genode::vprintf(const char *format, va_list list)
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{
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stdout_log_console()->vprintf(format, list);
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}
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