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/** \file input_common.c
Implementation file for the low level input library
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <wchar.h>
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#include "fallback.h"
#include "util.h"
#include "common.h"
#include "wutil.h"
#include "input_common.h"
#include "env_universal.h"
#include "iothread.h"
/**
Time in milliseconds to wait for another byte to be available for
reading after \\x1b 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[1024];
/**
Number of entries in lookahead_arr
*/
static int lookahead_count = 0;
/** Callback function for handling interrupts on reading */
static int (*interrupt_handler)();
/** Callback function to be invoked before reading each byte */
static void (*poll_handler)();
void input_common_init( int (*ih)() )
{
interrupt_handler = ih;
}
void input_common_set_poll_callback(void (*handler)(void))
{
poll_handler = handler;
}
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()
{
/* do_loop must be set on every path through the loop; leaving it uninitialized allows the static analyzer to assist in catching mistakes. */
unsigned char arr[1];
bool do_loop;
do
{
/* Invoke any poll handler */
if (poll_handler)
poll_handler();
fd_set fdset;
int fd_max=0;
int ioport = iothread_port();
int res;
FD_ZERO( &fdset );
FD_SET( 0, &fdset );
if( env_universal_server.fd > 0 )
{
FD_SET( env_universal_server.fd, &fdset );
if (fd_max < env_universal_server.fd) fd_max = env_universal_server.fd;
}
if (ioport > 0) {
FD_SET( ioport, &fdset );
if (fd_max < ioport) fd_max = ioport;
}
res = select( fd_max + 1, &fdset, 0, 0, 0 );
if( res==-1 )
{
switch( errno )
{
case EINTR:
case EAGAIN:
{
if( interrupt_handler )
{
int res = interrupt_handler();
if( res )
{
return res;
}
if( lookahead_count )
{
return lookahead_arr[--lookahead_count];
}
}
do_loop = true;
break;
}
default:
{
/*
The terminal has been closed. Save and exit.
*/
return R_EOF;
}
}
}
else
{
/* Assume we loop unless we see a character in stdin */
do_loop = true;
if( env_universal_server.fd > 0 && FD_ISSET( env_universal_server.fd, &fdset ) )
{
debug( 3, L"Wake up on universal variable event" );
env_universal_read_all();
if( lookahead_count )
{
return lookahead_arr[--lookahead_count];
}
}
if ( ioport > 0 && FD_ISSET(ioport, &fdset))
{
iothread_service_completion();
if( lookahead_count )
{
return lookahead_arr[--lookahead_count];
}
}
if( FD_ISSET( STDIN_FILENO, &fdset ) )
{
if( read_blocked( 0, arr, 1 ) != 1 )
{
/* The teminal has been closed. Save and exit. */
return R_EOF;
}
/* We read from stdin, so don't loop */
do_loop = false;
}
}
}
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();
char bb;
size_t sz;
if( (b >= R_NULL) && (b < R_NULL + 1000) )
return b;
bb=b;
sz = mbrtowc( &res, &bb, 1, &state );
switch( sz )
{
case (size_t)(-1):
memset (&state, '\0', sizeof (state));
debug( 2, L"Illegal input" );
return R_NULL;
case (size_t)(-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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