Coverage Report

Created: 2024-06-18 06:25

/src/mosh/src/terminal/terminal.cc
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Count
Source (jump to first uncovered line)
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/*
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    Mosh: the mobile shell
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    Copyright 2012 Keith Winstein
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    This program is free software: you can redistribute it and/or modify
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    it under the terms of the GNU General Public License as published by
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    the Free Software Foundation, either version 3 of the License, or
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    (at your option) any later version.
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    This program is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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    GNU General Public License for more details.
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    You should have received a copy of the GNU General Public License
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    along with this program.  If not, see <http://www.gnu.org/licenses/>.
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    In addition, as a special exception, the copyright holders give
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    permission to link the code of portions of this program with the
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    OpenSSL library under certain conditions as described in each
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    individual source file, and distribute linked combinations including
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    the two.
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    You must obey the GNU General Public License in all respects for all
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    of the code used other than OpenSSL. If you modify file(s) with this
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    exception, you may extend this exception to your version of the
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    file(s), but you are not obligated to do so. If you do not wish to do
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    so, delete this exception statement from your version. If you delete
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    this exception statement from all source files in the program, then
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    also delete it here.
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*/
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#include <cassert>
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#include <cstdlib>
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#include <cstring>
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#include <typeinfo>
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#include <unistd.h>
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#include "src/terminal/terminal.h"
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using namespace Terminal;
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Emulator::Emulator( size_t s_width, size_t s_height ) : fb( s_width, s_height ), dispatch(), user() {}
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std::string Emulator::read_octets_to_host( void )
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4.19M
{
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4.19M
  std::string ret = dispatch.terminal_to_host;
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4.19M
  dispatch.terminal_to_host.clear();
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4.19M
  return ret;
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4.19M
}
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void Emulator::execute( const Parser::Execute* act )
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0
{
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0
  dispatch.dispatch( CONTROL, act, &fb );
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0
}
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void Emulator::print( const Parser::Print* act )
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0
{
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0
  assert( act->char_present );
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0
  const wchar_t ch = act->ch;
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  /*
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   * Check for printing ISO 8859-1 first, it's a cheap way to detect
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   * some common narrow characters.
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   */
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0
  const int chwidth = ch == L'\0' ? -1 : ( Cell::isprint_iso8859_1( ch ) ? 1 : wcwidth( ch ) );
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  Cell* this_cell = fb.get_mutable_cell();
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  switch ( chwidth ) {
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    case 1: /* normal character */
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    case 2: /* wide character */
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      if ( fb.ds.auto_wrap_mode && fb.ds.next_print_will_wrap ) {
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        fb.get_mutable_row( -1 )->set_wrap( true );
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        fb.ds.move_col( 0 );
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        fb.move_rows_autoscroll( 1 );
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        this_cell = NULL;
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0
      } else if ( fb.ds.auto_wrap_mode && ( chwidth == 2 )
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                  && ( fb.ds.get_cursor_col() == fb.ds.get_width() - 1 ) ) {
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        /* wrap 2-cell chars if no room, even without will-wrap flag */
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        fb.reset_cell( this_cell );
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        fb.get_mutable_row( -1 )->set_wrap( false );
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        /* There doesn't seem to be a consistent way to get the
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           downstream terminal emulator to set the wrap-around
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           copy-and-paste flag on a row that ends with an empty cell
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           because a wide char was wrapped to the next line. */
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        fb.ds.move_col( 0 );
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        fb.move_rows_autoscroll( 1 );
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        this_cell = NULL;
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      }
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      if ( fb.ds.insert_mode ) {
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        for ( int i = 0; i < chwidth; i++ ) {
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          fb.insert_cell( fb.ds.get_cursor_row(), fb.ds.get_cursor_col() );
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        }
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        this_cell = NULL;
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0
      }
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      if ( !this_cell ) {
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        this_cell = fb.get_mutable_cell();
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      }
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      fb.reset_cell( this_cell );
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      this_cell->append( ch );
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      this_cell->set_wide( chwidth == 2 ); /* chwidth had better be 1 or 2 here */
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      fb.apply_renditions_to_cell( this_cell );
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      if ( chwidth == 2 && fb.ds.get_cursor_col() + 1 < fb.ds.get_width() ) { /* erase overlapped cell */
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        fb.reset_cell( fb.get_mutable_cell( fb.ds.get_cursor_row(), fb.ds.get_cursor_col() + 1 ) );
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      }
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      fb.ds.move_col( chwidth, true, true );
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      break;
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    case 0: /* combining character */
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0
    {
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      Cell* combining_cell = fb.get_combining_cell(); /* can be null if we were resized */
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      if ( combining_cell == NULL ) {                 /* character is now offscreen */
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        break;
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      }
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      if ( combining_cell->empty() ) {
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        /* cell starts with combining character */
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        /* ... but isn't necessarily the target for a new
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           base character [e.g. start of line], if the
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           combining character has been cleared with
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           a sequence like ED ("J") or EL ("K") */
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        assert( !combining_cell->get_wide() );
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        combining_cell->set_fallback( true );
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        fb.ds.move_col( 1, true, true );
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      }
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      if ( !combining_cell->full() ) {
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        combining_cell->append( ch );
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      }
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    } break;
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    case -1: /* unprintable character */
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      break;
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    default:
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      assert( !"unexpected character width from wcwidth()" );
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      break;
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  }
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}
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void Emulator::CSI_dispatch( const Parser::CSI_Dispatch* act )
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{
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  dispatch.dispatch( CSI, act, &fb );
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}
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void Emulator::OSC_end( const Parser::OSC_End* act )
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0
{
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  dispatch.OSC_dispatch( act, &fb );
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}
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void Emulator::Esc_dispatch( const Parser::Esc_Dispatch* act )
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0
{
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  /* handle 7-bit ESC-encoding of C1 control characters */
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  if ( ( dispatch.get_dispatch_chars().size() == 0 ) && ( 0x40 <= act->ch ) && ( act->ch <= 0x5F ) ) {
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    Parser::Esc_Dispatch act2 = *act;
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    act2.ch += 0x40;
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    dispatch.dispatch( CONTROL, &act2, &fb );
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  } else {
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    dispatch.dispatch( ESCAPE, act, &fb );
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  }
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}
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void Emulator::resize( size_t s_width, size_t s_height )
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0
{
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  fb.resize( s_width, s_height );
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}
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bool Emulator::operator==( Emulator const& x ) const
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0
{
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  /* dispatcher and user are irrelevant for us */
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  return fb == x.fb;
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0
}