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/** \file input_common.h
Implementation file for the low level input library
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <wchar.h>
#include "util.h"
#include "common.h"
#include "wutil.h"
#include "input_common.h"
#include "env_universal.h"
/**
Time in milliseconds to wait for another byte to be available for
reading after \e is read before assuming that escape key was
pressed, and not an escape sequence.
*/
#define WAIT_ON_ESCAPE 10
/**
Characters that have been read and returned by the sequence matching code
*/
static wint_t lookahead_arr[32];
/**
Number of entries in lookahead_arr
*/
static int lookahead_count = 0;
/**
Callback function for handling interrupts on reading
*/
static int (*interrupt_handler)();
void input_common_init( int (*ih)() )
{
interrupt_handler = ih;
}
void input_common_destroy()
{
}
/**
Internal function used by input_common_readch to read one byte from fd 1. This function should only be called by
input_common_readch().
*/
static wint_t readb()
{
char arr[1];
int do_loop = 0;
do
{
fd_set fd;
int fd_max=1;
int res;
FD_ZERO( &fd );
FD_SET( 0, &fd );
if( env_universal_server.fd > 0 )
{
FD_SET( env_universal_server.fd, &fd );
fd_max = env_universal_server.fd+1;
}
do_loop = 0;
res = select( fd_max, &fd, 0, 0, 0 );
if( res==-1 )
{
switch( errno )
{
case EINTR:
case EAGAIN:
{
// wperror( L"select" );
if( interrupt_handler )
{
int res = interrupt_handler();
/* debug( 0,
L"interrupt, %d is %ls",
res,
(res==R_NULL?L"good": L"Bad") );
*/
if( res )
return res;
}
do_loop = 1;
break;
}
default:
{
debug( 0, L"Error while reading input from keyboard, shutting down" );
wperror(L"read");
exit(1);
}
}
}
else
{
if( env_universal_server.fd > 0 )
{
if( FD_ISSET( env_universal_server.fd, &fd ) )
{
debug( 3, L"Wake up on universal variable event" );
env_universal_read_all();
return R_NULL;
}
}
if( FD_ISSET( 0, &fd ) )
{
if( read_blocked( 0, arr, 1 ) == -1 )
{
debug( 0, L"Error while reading input from keyboard, shutting down" );
wperror(L"read");
exit(1);
}
do_loop = 0;
}
}
}
while( do_loop );
return arr[0];
}
wchar_t input_common_readch( int timed )
{
if( lookahead_count == 0 )
{
if( timed )
{
int count;
fd_set fds;
struct timeval tm=
{
0,
1000 * WAIT_ON_ESCAPE
}
;
FD_ZERO( &fds );
FD_SET( 0, &fds );
count = select(1, &fds, 0, 0, &tm);
switch( count )
{
case 0:
return WEOF;
case -1:
return WEOF;
break;
default:
break;
}
}
wchar_t res;
static mbstate_t state;
while(1)
{
wint_t b = readb();
int sz;
if( b == R_NULL )
return R_NULL;
sz = mbrtowc( &res, &b, 1, &state );
switch( sz )
{
case -1:
memset (&state, '\0', sizeof (state));
debug( 2, L"Illegal input" );
return R_NULL;
case -2:
break;
case 0:
return 0;
default:
return res;
}
}
}
else
{
if( !timed )
{
while( (lookahead_count >= 0) && (lookahead_arr[lookahead_count-1] == WEOF) )
lookahead_count--;
if( lookahead_count == 0 )
return input_common_readch(0);
}
return lookahead_arr[--lookahead_count];
}
}
void input_common_unreadch( wint_t ch )
{
lookahead_arr[lookahead_count++] = ch;
}
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