/*
 * Cisco router simulation platform.
 * Copyright (c) 2005,2006 Christophe Fillot (cf@utc.fr)
 *
 * Virtual console TTY.
 */

#ifndef __DEV_VTTY_H__
#define __DEV_VTTY_H__

#include <sys/types.h>
#include <pthread.h>

#include "vm.h"
#include <stdio.h>

/* 4 Kb should be enough for a keyboard buffer */
#define VTTY_BUFFER_SIZE  4096

/* VTTY connection types */
enum {
   VTTY_TYPE_NONE = 0,
   VTTY_TYPE_TERM,
   VTTY_TYPE_TCP,
   VTTY_TYPE_SERIAL,
};

/* VTTY connection states (for TCP) */
enum {
   VTTY_STATE_TCP_INVALID,    /* connection is not working */
   VTTY_STATE_TCP_WAITING,    /* waiting for incoming connection */
   VTTY_STATE_TCP_RUNNING,    /* character reading/writing ok */
};

/* VTTY input states */
enum {
   VTTY_INPUT_TEXT,
   VTTY_INPUT_VT1,
   VTTY_INPUT_VT2,
   VTTY_INPUT_REMOTE,
   VTTY_INPUT_TELNET,
   VTTY_INPUT_TELNET_IYOU,
   VTTY_INPUT_TELNET_SB1,
   VTTY_INPUT_TELNET_SB2,
   VTTY_INPUT_TELNET_SB_TTYPE,
   VTTY_INPUT_TELNET_NEXT
};


/* Commmand line support utility */
typedef struct vtty_serial_option vtty_serial_option_t;
struct vtty_serial_option {
   char *device;
   int baudrate, databits, parity, stopbits, hwflow;
};

int vtty_parse_serial_option(vtty_serial_option_t *params, char *optarg);

/* Virtual TTY structure */
typedef struct virtual_tty vtty_t;
struct virtual_tty {
   vm_instance_t *vm;
   char *name;
   int type,state;
   int tcp_port;
   int terminal_support;
   int input_state;
   int input_pending;
   int telnet_cmd, telnet_opt, telnet_qual;
   int fd,accept_fd,*select_fd;
   int managed_flush;
   FILE *fstream;
   u_char buffer[VTTY_BUFFER_SIZE];
   u_int read_ptr,write_ptr;
   pthread_mutex_t lock;
   vtty_t *next,**pprev;
   void *priv_data;
   u_long user_arg;

   /* Read notification */
   void (*read_notifier)(vtty_t *);
};

#define VTTY_LOCK(tty) pthread_mutex_lock(&(tty)->lock);
#define VTTY_UNLOCK(tty) pthread_mutex_unlock(&(tty)->lock);

/* create a virtual tty */
vtty_t *vtty_create(vm_instance_t *vm,char *name,int type,int tcp_port,
                    const vtty_serial_option_t *option);

/* delete a virtual tty */
void vtty_delete(vtty_t *vtty);

/* Store a string in the FIFO buffer */
int vtty_store_str(vtty_t *vtty,char *str);

/* read a character from the buffer (-1 if the buffer is empty) */
int vtty_get_char(vtty_t *vtty);

/* print a character to vtty */
void vtty_put_char(vtty_t *vtty, char ch);

/* Put a buffer to vtty */
void vtty_put_buffer(vtty_t *vtty,char *buf,size_t len);

/* Flush VTTY output */
void vtty_flush(vtty_t *vtty);

/* returns TRUE if a character is available in buffer */
int vtty_is_char_avail(vtty_t *vtty);

/* write CTRL+C to buffer */
int vtty_store_ctrlc(vtty_t *);

/* Initialize the VTTY thread */
int vtty_init(void);

#endif