mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-26 08:51:08 +00:00
476 lines
11 KiB
C++
476 lines
11 KiB
C++
/*
|
|
* \brief Escape-sequence decoder
|
|
* \author Norman Feske
|
|
* \date 2011-06-06
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2011-2017 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU Affero General Public License version 3.
|
|
*/
|
|
|
|
#ifndef _TERMINAL__DECODER_H_
|
|
#define _TERMINAL__DECODER_H_
|
|
|
|
#include <terminal/character_screen.h>
|
|
|
|
namespace Terminal { class Decoder; }
|
|
|
|
|
|
class Terminal::Decoder
|
|
{
|
|
private:
|
|
|
|
/**
|
|
* Return digit value of character
|
|
*/
|
|
static inline int digit(char c)
|
|
{
|
|
if (c >= '0' && c <= '9') return c - '0';
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* Return true if character is a digit
|
|
*/
|
|
static inline bool is_digit(char c)
|
|
{
|
|
return (digit(c) >= 0);
|
|
}
|
|
|
|
/**
|
|
* Return true if number starts with the specified digit
|
|
*
|
|
* \param digit digit 0..9 to test for
|
|
*/
|
|
static inline bool starts_with_digit(int digit, int number)
|
|
{
|
|
for (; number > 9; number /= 10);
|
|
return (number == digit);
|
|
}
|
|
|
|
/**
|
|
* Return number with the first digit removed
|
|
*/
|
|
static inline int remove_first_digit(int number)
|
|
{
|
|
int factor = 1;
|
|
for (; number/factor > 9; factor *= 10);
|
|
return number % factor;
|
|
}
|
|
|
|
/**
|
|
* Buffer used for collecting escape sequences
|
|
*/
|
|
class Escape_stack
|
|
{
|
|
public:
|
|
|
|
struct Entry
|
|
{
|
|
enum { INVALID, NUMBER, CODE };
|
|
|
|
int type = INVALID;
|
|
int value = 0;
|
|
};
|
|
|
|
struct Number_entry : Entry
|
|
{
|
|
Number_entry(int number) { type = NUMBER, value = number; }
|
|
};
|
|
|
|
struct Code_entry : Entry
|
|
{
|
|
Code_entry(int code) { type = CODE, value = code; }
|
|
};
|
|
|
|
struct Invalid_entry : Entry { };
|
|
|
|
private:
|
|
|
|
enum { MAX_ENTRIES = 16 };
|
|
Entry _entries[MAX_ENTRIES];
|
|
int _index;
|
|
|
|
void _dump() const
|
|
{
|
|
Genode::log("--- escape stack follows ---");
|
|
for (int i = 0; i < _index; i++) {
|
|
int type = _entries[i].type;
|
|
int value = _entries[i].value;
|
|
Genode::log(type == Entry::INVALID ? " INVALID" :
|
|
type == Entry::NUMBER ? " NUMBER "
|
|
: " CODE ",
|
|
" ", value, " ",
|
|
"(", Genode::Hex(value), ")");
|
|
}
|
|
}
|
|
|
|
public:
|
|
|
|
Escape_stack() : _index(0) { }
|
|
|
|
void reset() { _index = 0; }
|
|
|
|
void push(Entry const &entry)
|
|
{
|
|
if (_index == MAX_ENTRIES - 1) {
|
|
Genode::error("escape stack overflow");
|
|
_dump();
|
|
reset();
|
|
return;
|
|
}
|
|
_entries[_index++] = entry;
|
|
}
|
|
|
|
/**
|
|
* Return number of stack elements
|
|
*/
|
|
unsigned num_elem() const { return _index; }
|
|
|
|
/**
|
|
* Return Nth stack entry
|
|
*
|
|
* 'index' is relative to the bottom of the stack.
|
|
*/
|
|
Entry operator [] (int index)
|
|
{
|
|
return (index <= _index) ? _entries[index] : Invalid_entry();
|
|
}
|
|
|
|
} _escape_stack { };
|
|
|
|
enum State {
|
|
STATE_IDLE,
|
|
STATE_ESC_SEQ, /* read escape sequence */
|
|
STATE_ESC_NUMBER /* read number argument within escape sequence */
|
|
} _state;
|
|
|
|
Character_screen &_screen;
|
|
|
|
int _number; /* current number argument supplied in escape sequence */
|
|
|
|
void _append_to_number(char c)
|
|
{
|
|
_number = _number*10 + digit(c);
|
|
}
|
|
|
|
void _enter_state_idle()
|
|
{
|
|
_state = STATE_IDLE;
|
|
_escape_stack.reset();
|
|
}
|
|
|
|
void _enter_state_esc_seq()
|
|
{
|
|
_state = STATE_ESC_SEQ;
|
|
_escape_stack.reset();
|
|
}
|
|
|
|
void _enter_state_esc_number()
|
|
{
|
|
_state = STATE_ESC_NUMBER;
|
|
_number = 0;
|
|
}
|
|
|
|
bool _sgr(int const p)
|
|
{
|
|
if (p < 30)
|
|
return (_screen.sgr(p), true);
|
|
|
|
/* p starting with digit '3' -> set foreground color */
|
|
if (starts_with_digit(3, p))
|
|
return (_screen.setaf(remove_first_digit(p)), true);
|
|
|
|
/* p starting with digit '4' -> set background color */
|
|
if (starts_with_digit(4, p))
|
|
return (_screen.setab(remove_first_digit(p)), true);
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Try to handle single-element escape sequence
|
|
*
|
|
* \return true if escape sequence was handled
|
|
*/
|
|
bool _handle_esc_seq_1()
|
|
{
|
|
switch (_escape_stack[0].value) {
|
|
case '7': return (_screen.sc(), true);
|
|
case '8': return (_screen.rc(), true);
|
|
case 'E': return (_screen.nel(), true);
|
|
case 'H': return (_screen.hts(), true);
|
|
case 'M': return (_screen.cuu1(), true);
|
|
case '=': return true; /* follows 'smkx' */
|
|
case '>': return true; /* follows 'rmkx' */
|
|
case 'c': return true; /* prefixes 'rs2' */
|
|
default: return false;
|
|
}
|
|
}
|
|
|
|
bool _handle_esc_seq_2()
|
|
{
|
|
switch (_escape_stack[0].value) {
|
|
|
|
case '[':
|
|
|
|
switch (_escape_stack[1].value) {
|
|
case 'C': return (_screen.cuf(1), true);
|
|
case 'H': return (_screen.home(), true);
|
|
case 'J': return (_screen.ed(), true);
|
|
case 'K': return (_screen.el(), true);
|
|
case 'L': return (_screen.il(1), true);
|
|
case 'M': return (_screen.dl(1), true);
|
|
case 'P': return (_screen.dch(1), true);
|
|
case 'Z': return (_screen.cbt(), true);
|
|
case 'm': return (_screen.sgr0(), true);
|
|
default: return false;
|
|
}
|
|
break;
|
|
|
|
case ')':
|
|
return (_escape_stack[1].value == 0) && (_screen.is2(), true);
|
|
|
|
default: return false;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool _handle_esc_seq_3()
|
|
{
|
|
|
|
/*
|
|
* All three-element sequences have the form \E[<NUMBER><COMMAND>
|
|
*/
|
|
if ((_escape_stack[0].value != '[')
|
|
|| (_escape_stack[1].type != Escape_stack::Entry::NUMBER))
|
|
return false;
|
|
|
|
int const p1 = _escape_stack[1].value;
|
|
char const command = _escape_stack[2].value;
|
|
|
|
switch (command) {
|
|
case 'm': return _sgr(p1);
|
|
case 'D': return (_screen.cub(p1), true);
|
|
case 'A': return (_screen.cuu(p1), true);
|
|
case 'B': return (_screen.cud(p1), true);
|
|
case 'g': return (p1 == 3) && (_screen.tbc(), true);
|
|
case 'h': return ((p1 == 4) && (_screen.smir(), true))
|
|
|| ((p1 == 34) && (_screen.cnorm(), true));
|
|
case 'K': return ((p1 == 0) && (_screen.el(), true))
|
|
|| ((p1 == 1) && (_screen.el1(), true));
|
|
case 'l': return ((p1 == 4) && (_screen.rmir(), true))
|
|
|| ((p1 == 34) && (_screen.cvvis(), true));
|
|
case 'L': return (_screen.il(p1), true);
|
|
case 'M': return (_screen.dl(p1), true);
|
|
case 'P': return (_screen.dch(p1), true);
|
|
case '@': return (_screen.ich(p1), true);
|
|
case 'C': return (_screen.cuf(p1), true);
|
|
|
|
default: return false;
|
|
}
|
|
}
|
|
|
|
bool _handle_esc_seq_4()
|
|
{
|
|
/*
|
|
* All four-element escape sequences have the form
|
|
* \E[?<NUMBER><COMMAND>
|
|
*/
|
|
if ((_escape_stack[0].value != '[')
|
|
|| (_escape_stack[1].value != '?')
|
|
|| (_escape_stack[2].type != Escape_stack::Entry::NUMBER))
|
|
return false;
|
|
|
|
int const p1 = _escape_stack[2].value;
|
|
char const command = _escape_stack[3].value;
|
|
|
|
switch (command) {
|
|
case 'l':
|
|
if (p1 == 1) return (_screen.rmkx(), true);
|
|
if (p1 == 25) return (_screen.civis(), true);
|
|
if (p1 == 1000) return (_screen.rs2(), true);
|
|
if (p1 == 1049) return (_screen.rmcup(), true);
|
|
if (p1 == 2004) {
|
|
/* disable bracketed paste */
|
|
Genode::warning("Sequence '[?2004l' is not implemented");
|
|
return true;
|
|
}
|
|
return false;
|
|
case 'h':
|
|
if (p1 == 1) return (_screen.smkx(), true);
|
|
if (p1 == 25) return (_screen.cnorm(), true);
|
|
if (p1 == 1049) return (_screen.smcup(), true);
|
|
if (p1 == 2004) {
|
|
/* enable bracketed paste */
|
|
Genode::warning("Sequence '[?2004h' is not implemented");
|
|
return true;
|
|
}
|
|
return false;
|
|
default: return false;
|
|
}
|
|
}
|
|
|
|
bool _handle_esc_seq_5()
|
|
{
|
|
/*
|
|
* All five-element escape sequences have the form
|
|
* \E[<NUMBER1>;<NUMBER2><COMMAND>
|
|
*/
|
|
if ((_escape_stack[0].value != '[')
|
|
|| (_escape_stack[1].type != Escape_stack::Entry::NUMBER)
|
|
|| (_escape_stack[2].value != ';')
|
|
|| (_escape_stack[3].type != Escape_stack::Entry::NUMBER))
|
|
return false;
|
|
|
|
int const p[2] = { _escape_stack[1].value,
|
|
_escape_stack[3].value };
|
|
int const command = _escape_stack[4].value;
|
|
|
|
switch (command) {
|
|
case 'r': return (_screen.csr(p[0], p[1]), true);
|
|
case 'H': return (_screen.cup(p[0], p[1]), true);
|
|
case 'm':
|
|
|
|
if (p[0] == 39 && p[1] == 49)
|
|
return (_screen.op(), true);
|
|
|
|
for (int i = 0; i < 2; i++)
|
|
if (!_sgr(p[i]))
|
|
Genode::warning("Number ", p[i],
|
|
" in sequence '[",
|
|
p[0], ";",
|
|
p[1], "m' is not implemented");
|
|
|
|
return true;
|
|
|
|
default: return false;
|
|
}
|
|
}
|
|
|
|
bool _handle_esc_seq_7()
|
|
{
|
|
/*
|
|
* All six-element escape sequences have the form
|
|
* \E[<NUMBER1>;<NUMBER2>;<NUMBER3><COMMAND>
|
|
*/
|
|
|
|
if ((_escape_stack[0].value != '[')
|
|
|| (_escape_stack[1].type != Escape_stack::Entry::NUMBER)
|
|
|| (_escape_stack[2].value != ';')
|
|
|| (_escape_stack[3].type != Escape_stack::Entry::NUMBER)
|
|
|| (_escape_stack[4].value != ';')
|
|
|| (_escape_stack[5].type != Escape_stack::Entry::NUMBER))
|
|
return false;
|
|
|
|
int const p[3] = { _escape_stack[1].value,
|
|
_escape_stack[3].value,
|
|
_escape_stack[5].value };
|
|
int const command = _escape_stack[6].value;
|
|
|
|
switch (command) {
|
|
case 'm':
|
|
|
|
for (int i = 0; i < 3; i++)
|
|
if (!_sgr(p[i]))
|
|
Genode::warning("Number ", p[i],
|
|
" in sequence '[",
|
|
p[0], ";",
|
|
p[1], ";",
|
|
p[2], "m' is not implemented");
|
|
|
|
return true;
|
|
|
|
default: return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
public:
|
|
|
|
Decoder(Character_screen &screen)
|
|
: _state(STATE_IDLE), _screen(screen), _number(0) { }
|
|
|
|
void insert(unsigned char c)
|
|
{
|
|
switch (_state) {
|
|
|
|
case STATE_IDLE:
|
|
|
|
enum { ESC_PREFIX = 0x1b };
|
|
if (c == ESC_PREFIX) {
|
|
_enter_state_esc_seq();
|
|
break;
|
|
}
|
|
|
|
/* handle special characters */
|
|
|
|
/* handle normal characters */
|
|
_screen.output(c);
|
|
|
|
break;
|
|
|
|
case STATE_ESC_SEQ:
|
|
|
|
/*
|
|
* We received the prefix character of an escape sequence,
|
|
* collect the escape-sequence elements until we detect the
|
|
* completion of the sequence.
|
|
*/
|
|
|
|
/* check for start of a number argument */
|
|
if (is_digit(c) && !_number)
|
|
{
|
|
_enter_state_esc_number();
|
|
_append_to_number(c);
|
|
break;
|
|
}
|
|
|
|
/* non-number character of escape sequence */
|
|
_escape_stack.push(Escape_stack::Code_entry(c));
|
|
break;
|
|
|
|
case STATE_ESC_NUMBER:
|
|
|
|
/*
|
|
* We got the first character belonging to a number
|
|
* argument of an escape sequence. Keep reading digits.
|
|
*/
|
|
if (is_digit(c)) {
|
|
_append_to_number(c);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* End of number is reached.
|
|
*/
|
|
|
|
/* push the complete number to the escape stack */
|
|
_escape_stack.push(Escape_stack::Number_entry(_number));
|
|
_number = 0;
|
|
|
|
/* push non-number character as commend entry */
|
|
_escape_stack.push(Escape_stack::Code_entry(c));
|
|
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Check for the completeness of an escape sequence.
|
|
*/
|
|
if (((_escape_stack.num_elem() == 1) && _handle_esc_seq_1())
|
|
|| ((_escape_stack.num_elem() == 2) && _handle_esc_seq_2())
|
|
|| ((_escape_stack.num_elem() == 3) && _handle_esc_seq_3())
|
|
|| ((_escape_stack.num_elem() == 4) && _handle_esc_seq_4())
|
|
|| ((_escape_stack.num_elem() == 5) && _handle_esc_seq_5())
|
|
|| ((_escape_stack.num_elem() == 7) && _handle_esc_seq_7()))
|
|
_enter_state_idle();
|
|
};
|
|
};
|
|
|
|
#endif /* _TERMINAL__DECODER_H_ */
|