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137 lines
3.2 KiB
C++
137 lines
3.2 KiB
C++
/*
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* \brief LOG service that prints to a terminal
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* \author Stefan Kalkowski
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* \date 2012-05-21
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*/
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/*
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* Copyright (C) 2012-2017 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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#include <root/component.h>
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#include <base/component.h>
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#include <base/heap.h>
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#include <util/string.h>
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#include <terminal_session/connection.h>
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#include <log_session/log_session.h>
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namespace Genode {
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class Termlog_component : public Rpc_object<Log_session>
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{
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public:
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enum { LABEL_LEN = 64 };
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private:
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char _label[LABEL_LEN];
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Terminal::Connection &_terminal;
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public:
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/**
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* Constructor
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*/
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Termlog_component(const char *label, Terminal::Connection &terminal)
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: _terminal(terminal) { snprintf(_label, LABEL_LEN, "[%s] ", label); }
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/*****************
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** Log session **
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*****************/
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/**
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* Write a log-message to the terminal.
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*
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* The following function's code is a modified variant of the one in:
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* 'base/src/core/include/log_session_component.h'
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*/
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void write(String const &string_buf) override
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{
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if (!(string_buf.valid_string())) {
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Genode::error("corrupted string");
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return;
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}
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char const *string = string_buf.string();
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size_t len = strlen(string);
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/*
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* Heuristic: The Log console implementation flushes
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* the output preferably in front of escape
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* sequences. If the line contains only
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* the escape sequence, we skip the printing
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* of the label and cut the line break (last
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* character).
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*/
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enum { ESC = 27 };
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if ((string[0] == ESC) && (len == 5) && (string[4] == '\n')) {
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_terminal.write(string, len - 1);
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return;
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}
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_terminal.write(_label, strlen(_label));
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_terminal.write(string, len);
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/* if last character of string was not a line break, add one */
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if ((len > 0) && (string[len - 1] != '\n'))
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_terminal.write("\n", 1);
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/* carriage-return as expected by hardware terminals on newline */
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_terminal.write("\r", 1);
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}
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};
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class Termlog_root : public Root_component<Termlog_component>
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{
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private:
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Terminal::Connection _terminal;
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protected:
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/**
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* Root component interface
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*/
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Termlog_component *_create_session(const char *args) override
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{
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char label_buf[Termlog_component::LABEL_LEN];
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Arg label_arg = Arg_string::find_arg(args, "label");
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label_arg.string(label_buf, sizeof(label_buf), "");
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return new (md_alloc()) Termlog_component(label_buf, _terminal);
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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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* \param session_ep entry point for managing cpu session objects
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* \param md_alloc meta-data allocator to be used by root component
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*/
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Termlog_root(Genode::Env &env, Allocator &md_alloc)
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: Root_component<Termlog_component>(env.ep(), md_alloc),
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_terminal(env, "log") { }
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};
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}
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void Component::construct(Genode::Env &env)
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{
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using namespace Genode;
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static Sliced_heap session_alloc(env.ram(), env.rm());
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static Genode::Termlog_root termlog_root(env, session_alloc);
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env.parent().announce(env.ep().manage(termlog_root));
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}
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