/* -*- mode: c; c-basic-offset: 2 -*- */

/*
 * nosy-dump - Interface to snoop mode driver for TI PCILynx 1394 controllers
 * Copyright (C) 2002-2006 Kristian Høgsberg
 *
 * 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 2 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, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <endian.h>
#include <popt.h>
#include <poll.h>
#include <byteswap.h>
#include <termios.h>

#include <signal.h>

#include "list.h"
#include "nosy-user.h"
#include "nosy-dump.h"

enum {
  PACKET_FIELD_DETAIL		= 0x01,
  PACKET_FIELD_DATA_LENGTH	= 0x02,
  /* Marks the fields we print in transaction view. */
  PACKET_FIELD_TRANSACTION	= 0x04
};

static void
print_packet(uint32_t *data, size_t length);
static void
decode_link_packet(struct link_packet *packet, size_t length,
		   int include_flags, int exclude_flags);

static int   run = 1;
sig_t sys_sigint_handler;

static char *option_nosy_device = "/dev/nosy";
static char *option_view = "packet";
static char *option_output = NULL;
static char *option_input = NULL;
static int   option_hex;
static int   option_iso;
static int   option_cycle_start;
static int   option_version;
static int   option_verbose;

enum {
  VIEW_TRANSACTION,
  VIEW_PACKET,
  VIEW_STATS
};

static const struct poptOption options[] = {
  {
    longName:	"device",
    shortName:	'd',
    argInfo:	POPT_ARG_STRING,
    arg:	&option_nosy_device,
    descrip:	"Path to nosy device.",
    argDescrip:	"DEVICE"
  },
  {
    longName:	"view",
    argInfo:	POPT_ARG_STRING,
    arg:	&option_view,
    descrip:	"Specify view of bus traffic: packet, transaction or stats.",
    argDescrip:	"VIEW"
  },
  {
    longName:	"hex",
    shortName:	'x',
    argInfo:	POPT_ARG_NONE,
    arg:	&option_hex,
    descrip:	"Print each packet in hex.",
  },
  {
    longName:	"iso",
    argInfo:	POPT_ARG_NONE,
    arg:	&option_iso,
    descrip:	"Print iso packets.",
  },
  {
    longName:	"cycle-start",
    argInfo:	POPT_ARG_NONE,
    arg:	&option_cycle_start,
    descrip:	"Print cycle start packets.",
  },
  {
    longName:	"verbose",
    shortName:	'v',
    argInfo:	POPT_ARG_NONE,
    arg:	&option_verbose,
    descrip:	"Verbose packet view.",
  },
  {
    longName:	"output",
    shortName:	'o',
    argInfo:	POPT_ARG_STRING,
    arg:	&option_output,
    descrip:	"Log to output file.",
    argDescrip:	"FILENAME"
  },
  {
    longName:	"input",
    shortName:	'i',
    argInfo:	POPT_ARG_STRING,
    arg:	&option_input,
    descrip:	"Decode log from file.",
    argDescrip:	"FILENAME"
  },
  {
    longName:	"version",
    argInfo:	POPT_ARG_NONE,
    arg:	&option_version,
    descrip:	"Specify print version info.",
  },
  POPT_AUTOHELP
  POPT_TABLEEND
};

void 
sigint_handler(int signal_num)
{
  if (run == 1) {
    run = 0;
    /* Allow all Ctrl-C's except the first to interrupt the program in
     * the usual way.
     */
    signal(SIGINT, SIG_DFL);
  }
}

struct subaction *
subaction_create(uint32_t *data, size_t length)
{
  struct subaction *sa;

  /* we put the ack in the subaction struct for easy access. */
  sa = malloc(sizeof *sa - sizeof sa->packet + length);
  sa->ack = data[length / 4 - 1];
  sa->length = length;
  memcpy (&sa->packet, data, length);

  return sa;
}

void
subaction_destroy(struct subaction *sa)
{
  free(sa);
}

struct list pending_transaction_list =
  { &pending_transaction_list, &pending_transaction_list };

struct link_transaction *
link_transaction_lookup(int request_node, int response_node, int tlabel)
{
  struct link_transaction *t;

  list_for_each_entry(t, &pending_transaction_list, link) {
    if (t->request_node == request_node &&
	t->response_node == response_node &&
	t->tlabel == tlabel)
      return t;
  }

  t = malloc(sizeof *t);
  t->request_node = request_node;
  t->response_node = response_node;
  t->tlabel = tlabel;
  list_init(&t->request_list);
  list_init(&t->response_list);
  
  list_append(&pending_transaction_list, &t->link);
  
  return t;
}

void
link_transaction_destroy(struct link_transaction *t)
{
  while (!list_empty(&t->request_list)) {
    struct subaction *sa = list_head(&t->request_list, struct subaction, link);
    list_remove(&sa->link);
    subaction_destroy(sa);
  }    

  while (!list_empty(&t->response_list)) {
    struct subaction *sa = list_head(&t->response_list, struct subaction, link);
    list_remove(&sa->link);
    subaction_destroy(sa);
  }    
  
  free(t);
}

struct protocol_decoder {
  const char *name;
  int (*decode)(struct link_transaction *t);
};

static struct protocol_decoder protocol_decoders[] = {
  { "FCP", decode_fcp }
};

void
handle_transaction(struct link_transaction *t)
{
  struct subaction *sa;
  int i;

  for (i = 0; i < array_length(protocol_decoders); i++)
    if (protocol_decoders[i].decode(t))
      break;

  /* HACK: decode only fcp right now. */
  return;

  decode_link_packet(&t->request->packet, t->request->length,
		     PACKET_FIELD_TRANSACTION, 0);
  if (t->response)
    decode_link_packet(&t->response->packet, t->request->length,
		       PACKET_FIELD_TRANSACTION, 0);
  else
    printf("[no response]");

  if (option_verbose) {
    list_for_each_entry(sa, &t->request_list, link)
      print_packet((uint32_t *) &sa->packet, sa->length);
    list_for_each_entry(sa, &t->response_list, link)
      print_packet((uint32_t *) &sa->packet, sa->length);
  }
  printf("\r\n");

  link_transaction_destroy(t);
}

void
clear_pending_transaction_list(void)
{
  struct link_transaction *t;

  while (!list_empty(&pending_transaction_list)) {
    t = list_head(&pending_transaction_list, struct link_transaction, link);
    list_remove(&t->link);
    link_transaction_destroy(t);
    /* print unfinished transactions */
  }    
}

static const char * const tcode_names[] = {
  "write_quadlet_request",
  "write_block_request",
  "write_response",
  "reserved",
  "read_quadlet_request",
  "read_block_request",
  "read_quadlet_response",
  "read_block_response",
  "cycle_start",
  "lock_request",
  "iso_data",
  "lock_response"
};

static const char * const ack_names[] = {
  "no ack",
  "ack_complete",
  "ack_pending",
  "reserved (0x03)",
  "ack_busy_x",
  "ack_busy_a",
  "ack_busy_b",
  "reserved (0x07)",
  "reserved (0x08)",
  "reserved (0x09)",
  "reserved (0x0a)",
  "reserved (0x0b)",
  "reserved (0x0c)",
  "ack_data_error",
  "ack_type_error",
  "reserved (0x0f)",
};

static const char * const rcode_names[] = {
  "complete",
  "reserved (0x01)",
  "reserved (0x02)",
  "reserved (0x03)",
  "conflict_error",
  "data_error",
  "type_error",
  "address_error",
};

static const char * const retry_names[] = {
  "retry_1",
  "retry_x",
  "retry_a",
  "retry_b",
};

enum {
  PACKET_RESERVED,
  PACKET_REQUEST,
  PACKET_RESPONSE,
  PACKET_OTHER,
};

struct packet_info {
  const char *name;
  int type;
  int response_tcode;
  struct packet_field *fields;
  int field_count;
};

struct packet_field {
  const char *name;	/* Short name for field. */
  int offset;		/* Location of field, specified in bits.
			 * Negative means from end of packet */
  int width;		/* Width of field, 0 means use data_length. */
  int flags;		/* Show options. */
  const char * const *value_names;
};

#define COMMON_REQUEST_FIELDS					\
  { "dest", 0, 16, PACKET_FIELD_TRANSACTION },			\
  { "tl", 16, 6 },						\
  { "rt", 22, 2, PACKET_FIELD_DETAIL, retry_names },		\
  { "tcode", 24, 4, PACKET_FIELD_TRANSACTION, tcode_names },	\
  { "pri", 28, 4, PACKET_FIELD_DETAIL },			\
  { "src", 32, 16, PACKET_FIELD_TRANSACTION },			\
  { "offs", 48, 48, PACKET_FIELD_TRANSACTION }

#define COMMON_RESPONSE_FIELDS					\
  { "dest", 0, 16 },						\
  { "tl", 16, 6 },						\
  { "rt", 22, 2, PACKET_FIELD_DETAIL, retry_names },		\
  { "tcode", 24, 4, 0, tcode_names },				\
  { "pri", 28, 4, PACKET_FIELD_DETAIL },			\
  { "src", 32, 16 },						\
  { "rcode", 48, 4, PACKET_FIELD_TRANSACTION, rcode_names }

struct packet_field read_quadlet_request_fields[] = {
  COMMON_REQUEST_FIELDS,
  { "crc", 96, 32, PACKET_FIELD_DETAIL },
  { "ack", 156, 4, 0, ack_names }
};

struct packet_field read_quadlet_response_fields[] = {
  COMMON_RESPONSE_FIELDS,
  { "data", 96, 32, PACKET_FIELD_TRANSACTION },
  { "crc", 128, 32, PACKET_FIELD_DETAIL },
  { "ack", 188, 4, 0, ack_names }
};

struct packet_field read_block_request_fields[] = {
  COMMON_REQUEST_FIELDS,
  { "data_length", 96, 16, PACKET_FIELD_TRANSACTION },
  { "extended_tcode", 112, 16 },
  { "crc", 128, 32, PACKET_FIELD_DETAIL },
  { "ack", 188, 4, 0, ack_names },
};

struct packet_field block_response_fields[] = {
  COMMON_RESPONSE_FIELDS,
  { "data_length", 96, 16, PACKET_FIELD_DATA_LENGTH },
  { "extended_tcode", 112, 16 },
  { "crc", 128, 32, PACKET_FIELD_DETAIL },
  { "data", 160, 0, PACKET_FIELD_TRANSACTION },
  { "crc", -64, 32, PACKET_FIELD_DETAIL },
  { "ack", -4, 4, 0, ack_names }
};

struct packet_field write_quadlet_request_fields[] = {
  COMMON_REQUEST_FIELDS,
  { "data", 96, 32, PACKET_FIELD_TRANSACTION },
  { "ack", -4, 4, 0, ack_names }
};

struct packet_field block_request_fields[] = {
  COMMON_REQUEST_FIELDS,
  { "data_length", 96, 16, PACKET_FIELD_DATA_LENGTH | PACKET_FIELD_TRANSACTION },
  { "extended_tcode", 112, 16, PACKET_FIELD_TRANSACTION },
  { "crc", 128, 32, PACKET_FIELD_DETAIL },
  { "data", 160, 0, PACKET_FIELD_TRANSACTION },
  { "crc", -64, 32, PACKET_FIELD_DETAIL },
  { "ack", -4, 4, 0, ack_names }
};

struct packet_field write_response_fields[] = {
  COMMON_RESPONSE_FIELDS,
  { "reserved", 64, 32, PACKET_FIELD_DETAIL },
  { "ack", -4, 4, 0, ack_names }
};

struct packet_field iso_data_fields[] = {
  { "data_length", 0, 16, PACKET_FIELD_DATA_LENGTH },
  { "tag", 16, 2 },
  { "channel", 18, 6 },
  { "tcode", 24, 4, 0, tcode_names },
  { "sy", 28, 4 },
  { "crc", 32, 32, PACKET_FIELD_DETAIL },
  { "data", 64, 0 },
  { "crc", -64, 32, PACKET_FIELD_DETAIL },
  { "ack", -4, 4, 0, ack_names }
};

static struct packet_info packet_info[] = {
  {
    .name =		"write_quadlet_request",
    .type =		PACKET_REQUEST,
    .response_tcode =	TCODE_WRITE_RESPONSE,
    .fields =		write_quadlet_request_fields,
    .field_count =	array_length(write_quadlet_request_fields)
  },
  {
    .name =		"write_block_request",
    .type =		PACKET_REQUEST,
    .response_tcode = 	TCODE_WRITE_RESPONSE,
    .fields =		block_request_fields,
    .field_count =	array_length(block_request_fields)
  },
  {
    .name =		"write_response",
    .type =		PACKET_RESPONSE,
    .fields =		write_response_fields,
    .field_count =	array_length(write_response_fields)
  },
  {
    .name =		"reserved",
    .type =		PACKET_RESERVED,
  },
  {
    .name =		"read_quadlet_request",
    .type =		PACKET_REQUEST,
    .response_tcode = 	TCODE_READ_QUADLET_RESPONSE,
    .fields =		read_quadlet_request_fields,
    .field_count =	array_length(read_quadlet_request_fields)
  },
  {
    .name =		"read_block_request",
    .type =		PACKET_REQUEST,
    .response_tcode = 	TCODE_READ_BLOCK_RESPONSE,
    .fields =		read_block_request_fields,
    .field_count =	array_length(read_block_request_fields)
  },
  {
    .name =		"read_quadlet_response",
    .type =		PACKET_RESPONSE,
    .fields =		read_quadlet_response_fields,
    .field_count =	array_length(read_quadlet_response_fields)
  },
  {
    .name =		"read_block_response",
    .type =		PACKET_RESPONSE,
    .fields =		block_response_fields,
    .field_count =	array_length(block_response_fields)
  },
  {
    .name =		"cycle_start",
    .type =		PACKET_OTHER,
    .fields =		write_quadlet_request_fields,
    .field_count =	array_length(write_quadlet_request_fields)
  },
  {
    .name =		"lock_request",
    .type =		PACKET_REQUEST,
    .fields =		block_request_fields,
    .field_count =	array_length(block_request_fields)
  },
  {
    .name =		"iso_data",
    .type =		PACKET_OTHER,
    .fields =		iso_data_fields,
    .field_count =	array_length(iso_data_fields)
  },
  {
    .name =		"lock_response",
    .type =		PACKET_RESPONSE,
    .fields =		block_response_fields,
    .field_count =	array_length(block_response_fields)
  }
};

int
handle_packet(uint32_t *data, size_t length)
{
  if (length == 0) {
    printf("bus reset\r\n");
    clear_pending_transaction_list();
  }
  else if (length > sizeof(struct phy_packet)) {
    struct link_packet *p = (struct link_packet *) data;
    struct subaction *sa, *prev;
    struct link_transaction *t;

    switch (packet_info[p->common.tcode].type) {
    case PACKET_REQUEST:
      t = link_transaction_lookup(p->common.source, p->common.destination,
				  p->common.tlabel);
      sa = subaction_create(data, length);
      t->request = sa;

      if (!list_empty(&t->request_list)) {
	prev = list_tail(&t->request_list, struct subaction, link);

	if (!ACK_BUSY(prev->ack)) {
	  /* error, we should only see ack_busy_* before the
	   * ack_pending/ack_complete -- this is an ack_pending
	   * instead (ack_complete would have finished the
	   * transaction). */
	}
	
	if (prev->packet.common.tcode != sa->packet.common.tcode ||
	    prev->packet.common.tlabel != sa->packet.common.tlabel)
	  /* memcmp() ? */
	  /* error, these should match for retries. */;
      }

      list_append(&t->request_list, &sa->link);

      switch (sa->ack) {
      case ACK_COMPLETE:
	if (p->common.tcode != TCODE_WRITE_QUADLET &&
	    p->common.tcode != TCODE_WRITE_BLOCK)
	  /* error, unified transactions only allowed for write */;
	list_remove(&t->link);
	handle_transaction(t);
	break;

      case ACK_NO_ACK:
      case ACK_DATA_ERROR:
      case ACK_TYPE_ERROR:
	list_remove(&t->link);
	handle_transaction(t);
	break;

      case ACK_PENDING:
	/* request subaction phase over, wait for response. */
	break;

      case ACK_BUSY_X:
      case ACK_BUSY_A:
      case ACK_BUSY_B:
	/* ok, wait for retry. */
	/* check that retry protocol is respected. */
	break;
      }
      break;

    case PACKET_RESPONSE:
      t = link_transaction_lookup(p->common.destination, p->common.source,
				  p->common.tlabel);
      if (list_empty(&t->request_list)) {
	/* unsolicited response */
      }

      sa = subaction_create(data, length);
      t->response = sa;

      if (!list_empty(&t->response_list)) {
	prev = list_tail(&t->response_list, struct subaction, link);

	if (!ACK_BUSY(prev->ack))
	  /* error, we should only see ack_busy_* before the
	   * ack_pending/ack_complete */;

	if (prev->packet.common.tcode != sa->packet.common.tcode ||
	    prev->packet.common.tlabel != sa->packet.common.tlabel)
	  /* use memcmp() instead? */
	  /* error, these should match for retries. */;
      }
      else {
	prev = list_tail(&t->request_list, struct subaction, link);
	if (prev->ack != ACK_PENDING) {
	  /* error, should not get response unless last request got
	   * ack_pending. */
	}
	
	if (packet_info[prev->packet.common.tcode].response_tcode !=
	    sa->packet.common.tcode) {
	  /* error, tcode mismatch */
	}
      }
      
      list_append(&t->response_list, &sa->link);

      switch (sa->ack) {
      case ACK_COMPLETE:
      case ACK_NO_ACK:
      case ACK_DATA_ERROR:
      case ACK_TYPE_ERROR:
	list_remove(&t->link);
	handle_transaction(t);
	/* transaction complete, remove t from pending list. */
	break;

      case ACK_PENDING:
	/* error for responses. */
	break;

      case ACK_BUSY_X:
      case ACK_BUSY_A:
      case ACK_BUSY_B:
	/* no problem, wait for next retry */
	break;
      }
      
      break;

    case PACKET_OTHER:
    case PACKET_RESERVED:
      return 0;
    }
  }

  return 1;
}

unsigned int get_bits(struct link_packet *packet, int offset, int width)
{
  uint32_t *data = (uint32_t *) packet;
  uint32_t index, shift, mask;

  index = offset / 32 + 1;
  shift = 32 - (offset & 31) - width;
  mask = width == 32 ? ~0 : (1 << width) - 1;

  return (data[index] >> shift) & mask;
}

#if __BYTE_ORDER == __LITTLE_ENDIAN
#define byte_index(i) ((i) ^ 3)
#elif __BYTE_ORDER == __BIG_ENDIAN
#define byte_index(i) (i)
#else
#error unsupported byte order.
#endif

void dump_data(unsigned char *data, int length)
{
  int i, print_length;

  if (length > 128)
    print_length = 128;
  else
    print_length = length;

  for (i = 0; i < print_length; i++)
    printf("%s%02hhx",
	   (i % 4 == 0 && i != 0) ? " " : "",
	   data[byte_index(i)]);

  if (print_length < length)
    printf(" (%d more bytes)", length - print_length);
}

static void
decode_link_packet(struct link_packet *packet, size_t length,
		   int include_flags, int exclude_flags)
{
  struct packet_info *pi;
  int data_length = 0;
  int i;

  pi = &packet_info[packet->common.tcode];

  for (i = 0; i < pi->field_count; i++) {
    struct packet_field *f = &pi->fields[i];
    int offset;

    if (f->flags & exclude_flags)
      continue;
    if (include_flags && !(f->flags & include_flags))
      continue;

    if (f->offset < 0)
      offset = length * 8 + f->offset - 32;
    else
      offset = f->offset;

    if (f->value_names != NULL) {
      uint32_t bits;

      bits = get_bits(packet, offset, f->width);
      printf("%s", f->value_names[bits]);
    }
    else if (f->width == 0) {
      printf("%s=[", f->name);
      dump_data((unsigned char *) packet + (offset / 8 + 4), data_length);
      printf("]");
    }
    else {
      unsigned long long bits;
      int high_width, low_width;

      if ((offset & ~31) != ((offset + f->width - 1) & ~31)) {
	/* Bit field spans quadlet boundary. */
	high_width = ((offset + 31) & ~31) - offset;
	low_width = f->width - high_width;

	bits = get_bits(packet, offset, high_width);
	bits = (bits << low_width) |
	  get_bits(packet, offset + high_width, low_width);
      }
      else
	bits = get_bits(packet, offset, f->width);

      printf("%s=0x%0*llx", f->name, (f->width + 3) / 4, bits);

      if (f->flags & PACKET_FIELD_DATA_LENGTH)
	data_length = bits;
    }

    if (i < pi->field_count - 1)
      printf(", ");
  }
}

static void
print_packet(uint32_t *data, size_t length)
{
  int i;

  printf("%6u  ", data[0]);

  if (length == 4)
    printf("bus reset");
  else if (length < sizeof(struct phy_packet)) {
    printf("short packet: ");
    for (i = 1; i < length / 4; i++)
      printf("%s%08x", i == 0 ? "[" : " ", data[i]);
    printf("]");

  }
  else if (length == sizeof(struct phy_packet) && data[1] == ~data[2]) {
    struct phy_packet *pp = (struct phy_packet *) data;

    /* phy packet are 3 quadlets: the 1 quadlet payload,
     * the bitwise inverse of the payload and the snoop
     * mode ack */

    switch (pp->common.identifier) {
    case PHY_PACKET_CONFIGURATION:
      if (!pp->phy_config.set_root && !pp->phy_config.set_gap_count) {
	printf("ext phy config: phy_id=%02x", pp->phy_config.root_id);
      }
      else {
	printf("phy config:");
	if (pp->phy_config.set_root)
	  printf(" set_root_id=%02x", pp->phy_config.root_id);
	if (pp->phy_config.set_gap_count)
	  printf(" set_gap_count=%d", pp->phy_config.gap_count);
      }
      break;

    case PHY_PACKET_LINK_ON:
      printf("link-on packet, phy_id=%02x", pp->link_on.phy_id);
      break;

    case PHY_PACKET_SELF_ID:
      if (pp->self_id.extended) {
	printf("extended self id: phy_id=%02x, seq=%d",
	       pp->ext_self_id.phy_id, pp->ext_self_id.sequence);
      }
      else {
	static const char * const speed_names[] = {
	  "S100", "S200", "S400", "BETA"
	};
	printf("self id: phy_id=%02x, link %s, gap_count=%d, speed=%s%s%s", 
	       pp->self_id.phy_id,
	       (pp->self_id.link_active ? "active" : "not active"),
	       pp->self_id.gap_count,
	       speed_names[pp->self_id.phy_speed],
	       (pp->self_id.contender ? ", irm contender" : ""),
	       (pp->self_id.initiated_reset ? ", initiator" : ""));
	       
      }
      break;
    default:
      printf("unknown phy packet: ");
      for (i = 1; i < length / 4; i++)
	printf("%s%08x", i == 0 ? "[" : " ", data[i]);
      printf("]");
      break;
    }
  }
  else {
    struct link_packet *packet = (struct link_packet *) data;

    decode_link_packet(packet, length, 0,
		       option_verbose ? 0 : PACKET_FIELD_DETAIL);
  }

  if (option_hex) {
    printf("  [");
    dump_data((unsigned char *) data + 4, length - 4);
    printf("]");
  }

  printf("\r\n");
}

#define HIDE_CURSOR	"\033[?25l"
#define SHOW_CURSOR	"\033[?25h"
#define CLEAR		"\033[H\033[2J"

static void
print_stats(uint32_t *data, size_t length)
{
  static int bus_reset_count, short_packet_count, phy_packet_count;
  static int tcode_count[16];
  static struct timeval last_update;
  struct timeval now;
  int i;

  if (length == 0)
    bus_reset_count++;
  else if (length < sizeof(struct phy_packet))
    short_packet_count++;
  else if (length == sizeof(struct phy_packet) && data[1] == ~data[2])
    phy_packet_count++;
  else {
    struct link_packet *packet = (struct link_packet *) data;
    tcode_count[packet->common.tcode]++;
  }

  gettimeofday(&now, NULL);
  if (now.tv_sec <= last_update.tv_sec &&
      now.tv_usec < last_update.tv_usec + 500000)
    return;
  
  last_update = now;
  printf(CLEAR HIDE_CURSOR
	 "  bus resets              : %8d\n"
	 "  short packets           : %8d\n"
	 "  phy packets             : %8d\n",
	 bus_reset_count, short_packet_count, phy_packet_count);

  for (i = 0; i < array_length(packet_info); i++)
    if (packet_info[i].type != PACKET_RESERVED)
      printf("  %-24s: %8d\n", packet_info[i].name, tcode_count[i]);
  printf(SHOW_CURSOR "\n");
}

struct termios saved_attributes;

void
reset_input_mode (void)
{
  tcsetattr (STDIN_FILENO, TCSANOW, &saved_attributes);
}

void
set_input_mode (void)
{
  struct termios tattr;

  /* Make sure stdin is a terminal. */
  if (!isatty(STDIN_FILENO)) {
    fprintf(stderr, "Not a terminal.\n");
    exit(EXIT_FAILURE);
  }

  /* Save the terminal attributes so we can restore them later. */
  tcgetattr(STDIN_FILENO, &saved_attributes);
  atexit(reset_input_mode);

  /* Set the funny terminal modes. */
  tcgetattr(STDIN_FILENO, &tattr);
  tattr.c_lflag &= ~(ICANON|ECHO); /* Clear ICANON and ECHO. */
  tattr.c_cc[VMIN] = 1;
  tattr.c_cc[VTIME] = 0;
  tcsetattr(STDIN_FILENO, TCSAFLUSH, &tattr);
}

int main(int argc, const char *argv[])
{
  int fd = -1;
  FILE *output = NULL, *input = NULL;
  poptContext con;
  int retval;
  int view;
  char c;
  struct pollfd pollfds[2];

  sys_sigint_handler = signal(SIGINT, sigint_handler);

  con = poptGetContext(NULL, argc, argv, options, 0);
  retval = poptGetNextOpt(con);
  if (retval < -1) {
    poptPrintUsage(con, stdout, 0);
    return -1;
  }

  if (option_version) {
    printf("dump tool for nosy sniffer, version %s\n", VERSION);
    return 0;
  }

  if (__BYTE_ORDER != __LITTLE_ENDIAN)
    fprintf(stderr, "warning: nosy has only been tested on little "
	    "endian machines\n");

  if (option_input != NULL) {
    input = fopen(option_input, "r");
    if (input == NULL) {
      fprintf(stderr, "Could not open %s, %m\n", option_input);
      return -1;
    }
  }
  else {
    fd = open(option_nosy_device, O_RDWR);
    if (fd < 0) {
      fprintf(stderr, "Could not open %s, %m\n", option_nosy_device);
      return -1;
    }
    set_input_mode();
  }

  if (strcmp(option_view, "transaction") == 0)
    view = VIEW_TRANSACTION;
  else if (strcmp(option_view, "stats") == 0)
    view = VIEW_STATS;
  else
    view = VIEW_PACKET;

  if (option_output) {
    output = fopen(option_output, "w");
    if (output == NULL) {
      fprintf(stderr, "Could not open %s, %m\n", option_output);
      return -1;
    }
  }

  setvbuf(stdout, NULL, _IOLBF, BUFSIZ);

  if (1) {
    uint32_t buf[128 * 1024];
    uint32_t filter;
    int length;

    filter = ~0;
    if (!option_iso)
      filter &= ~(1 <<TCODE_ISO_DATA);
    if (!option_cycle_start)
      filter &= ~(1 << TCODE_CYCLE_START);
    if (view == VIEW_STATS)
      filter = ~(1 << TCODE_CYCLE_START);

    ioctl(fd, NOSY_IOC_FILTER, filter);

    ioctl(fd, NOSY_IOC_START);

    pollfds[0].fd = fd;
    pollfds[0].events = POLLIN;
    pollfds[1].fd = STDIN_FILENO;
    pollfds[1].events = POLLIN;

    while (run) {
      if (input != NULL) {
	if (fread(&length, sizeof length, 1, input) != 1)
	  return 0;
	fread(buf, 1, length, input);
      }
      else {
	poll(pollfds, 2, -1);
	if (pollfds[1].revents) {
	  read(STDIN_FILENO, &c, sizeof c);
	  switch (c) {
	  case 'q':
	    if (output != NULL)
	      fclose(output);
	    return 0;
	  }
	}

	if (pollfds[0].revents)
	  length = read(fd, buf, sizeof buf);
	else
	  continue;
      }

      if (output != NULL) {
	fwrite(&length, sizeof length, 1, output);
	fwrite(buf, 1, length, output);
      }

      switch (view) {
      case VIEW_TRANSACTION:
	handle_packet(buf, length);
	break;
      case VIEW_PACKET:
	print_packet(buf, length);
	break;
      case VIEW_STATS:
	print_stats(buf, length);
	break;
      }
    }
  }
  else
    poptPrintUsage(con, stdout, 0);

  if (output != NULL)
    fclose(output);

  close(fd);

  poptFreeContext(con);

  return 0;
}