/
parse.cc
207 lines (168 loc) · 4.68 KB
/
parse.cc
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/*
Mosh: the mobile shell
Copyright 2012 Keith Winstein
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <errno.h>
#include <string.h>
#include <locale.h>
#include <wchar.h>
#include <assert.h>
#include <wctype.h>
#include <iostream>
#include <typeinfo>
#include <termios.h>
#if HAVE_PTY_H
#include <pty.h>
#elif HAVE_UTIL_H
#include <util.h>
#endif
#include "parser.h"
#include "swrite.h"
#include "locale_utils.h"
#include "fatal_assert.h"
#include "select.h"
const size_t buf_size = 1024;
void emulate_terminal( int fd );
int copy( int src, int dest );
int vt_parser( int fd, Parser::UTF8Parser *parser );
int main( int argc __attribute__((unused)),
char *argv[] __attribute__((unused)),
char *envp[] )
{
int master;
struct termios saved_termios, raw_termios, child_termios;
set_native_locale();
fatal_assert( is_utf8_locale() );
if ( tcgetattr( STDIN_FILENO, &saved_termios ) < 0 ) {
perror( "tcgetattr" );
exit( 1 );
}
child_termios = saved_termios;
#ifdef HAVE_IUTF8
if ( !(child_termios.c_iflag & IUTF8) ) {
fprintf( stderr, "Warning: Locale is UTF-8 but termios IUTF8 flag not set. Setting IUTF8 flag.\n" );
child_termios.c_iflag |= IUTF8;
}
#else
fprintf( stderr, "Warning: termios IUTF8 flag not defined. Character-erase of multibyte character sequence probably does not work properly on this platform.\n" );
#endif /* HAVE_IUTF8 */
pid_t child = forkpty( &master, NULL, &child_termios, NULL );
if ( child == -1 ) {
perror( "forkpty" );
exit( 1 );
}
if ( child == 0 ) {
/* child */
char *my_argv[ 2 ];
my_argv[ 0 ] = strdup( "/bin/bash" );
assert( my_argv[ 0 ] );
my_argv[ 1 ] = NULL;
if ( execve( "/bin/bash", my_argv, envp ) < 0 ) {
perror( "execve" );
exit( 1 );
}
exit( 0 );
} else {
/* parent */
raw_termios = saved_termios;
cfmakeraw( &raw_termios );
if ( tcsetattr( STDIN_FILENO, TCSANOW, &raw_termios ) < 0 ) {
perror( "tcsetattr" );
exit( 1 );
}
emulate_terminal( master );
if ( tcsetattr( STDIN_FILENO, TCSANOW, &saved_termios ) < 0 ) {
perror( "tcsetattr" );
exit( 1 );
}
}
return 0;
}
void emulate_terminal( int fd )
{
Parser::UTF8Parser parser;
Select &sel = Select::get_instance();
sel.add_fd( STDIN_FILENO );
sel.add_fd( fd );
while ( 1 ) {
int active_fds = sel.select( -1 );
if ( active_fds <= 0 ) {
perror( "select" );
return;
}
if ( sel.read( STDIN_FILENO ) ) {
if ( copy( STDIN_FILENO, fd ) < 0 ) {
return;
}
} else if ( sel.read( fd ) ) {
if ( vt_parser( fd, &parser ) < 0 ) {
return;
}
} else if ( sel.error( STDIN_FILENO ) || sel.error( fd ) ) {
return;
} else {
fprintf( stderr, "select mysteriously woken up\n" );
}
}
}
int copy( int src, int dest )
{
char buf[ buf_size ];
ssize_t bytes_read = read( src, buf, buf_size );
if ( bytes_read == 0 ) { /* EOF */
return -1;
} else if ( bytes_read < 0 ) {
perror( "read" );
return -1;
}
return swrite( dest, buf, bytes_read );
}
int vt_parser( int fd, Parser::UTF8Parser *parser )
{
char buf[ buf_size ];
/* fill buffer if possible */
ssize_t bytes_read = read( fd, buf, buf_size );
if ( bytes_read == 0 ) { /* EOF */
return -1;
} else if ( bytes_read < 0 ) {
perror( "read" );
return -1;
}
/* feed to parser */
for ( int i = 0; i < bytes_read; i++ ) {
std::list<Parser::Action *> actions = parser->input( buf[ i ] );
for ( std::list<Parser::Action *>::iterator j = actions.begin();
j != actions.end();
j++ ) {
Parser::Action *act = *j;
assert( act );
if ( act->char_present ) {
if ( iswprint( act->ch ) ) {
printf( "%s(0x%02x=%lc) ", act->name().c_str(), (unsigned int)act->ch, act->ch );
} else {
printf( "%s(0x%02x) ", act->name().c_str(), (unsigned int)act->ch );
}
} else {
printf( "[%s] ", act->name().c_str() );
}
delete act;
fflush( stdout );
}
}
return 0;
}