/* Generic serial interface routines
   Copyright 1992, 1993, 1996 Free Software Foundation, Inc.

This file is part of GDB.

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 "defs.h"
#include <ctype.h>
#include "serial.h"
#include "gdb_string.h"
#include "gdbcmd.h"

//#define DEBUGIFY
#include "debugify.h"


/* Linked list of serial I/O handlers */

static struct serial_ops *serial_ops_list = NULL;

/* This is the last serial stream opened.  Used by connect command. */

static serial_t last_serial_opened = NULL;

/* Pointer to list of scb's. */

static serial_t scb_base;

/* Non-NULL gives filename which contains a recording of the remote session,
   suitable for playback by gdbserver. */

static char *serial_logfile = NULL;
static FILE *serial_logfp = NULL;

static struct serial_ops *serial_interface_lookup PARAMS ((char *));
static void serial_logchar PARAMS ((int ch, int timeout));
static char logbase_hex[] = "hex";
static char logbase_octal[] = "octal";
static char logbase_ascii[] = "ascii";
static char *logbase_enums[] = {logbase_hex, logbase_octal, logbase_ascii, NULL};
static char *serial_logbase = logbase_ascii;


static int serial_reading = 0;
static int serial_writing = 0;

void
serial_log_command (cmd)
     const char *cmd;
{
  if (!serial_logfp)
    return;

  if (serial_reading || serial_writing)
    {
      fputc_unfiltered ('\n', serial_logfp);
      serial_reading = 0;
      serial_writing = 0;
    }
  fprintf_unfiltered (serial_logfp, "c %s\n", cmd);
  /* Make sure that the log file is as up-to-date as possible,
     in case we are getting ready to dump core or something. */
  fflush (serial_logfp);
}

/* Define bogus char to represent a BREAK.  Should be careful to choose a value
   that can't be confused with a normal char, or an error code.  */
#define SERIAL_BREAK 1235

static void
serial_logchar (ch, timeout)
     int ch;
     int timeout;
{
  if (serial_logbase != logbase_ascii)
    fputc_unfiltered (' ', serial_logfp);

  switch (ch)
    {
    case SERIAL_TIMEOUT:
      fprintf_unfiltered (serial_logfp, "<Timeout: %d seconds>", timeout);
      return;
    case SERIAL_ERROR:
      fprintf_unfiltered (serial_logfp, "<Error: %s>", safe_strerror (errno));
      return;
    case SERIAL_EOF:
      fputs_unfiltered ("<Eof>", serial_logfp);
      return;
    case SERIAL_BREAK:
      fputs_unfiltered ("<Break>", serial_logfp);
      return;
    default:
      if (serial_logbase == logbase_hex)
	fprintf_unfiltered (serial_logfp, "%02x", ch & 0xff);
      else if (serial_logbase == logbase_octal)
	fprintf_unfiltered (serial_logfp, "%03o", ch & 0xff);
      else
	switch (ch)
	  {
	  case '\\':	fputs_unfiltered ("\\\\", serial_logfp); break;	
	  case '\b':	fputs_unfiltered ("\\b", serial_logfp); break;	
	  case '\f':	fputs_unfiltered ("\\f", serial_logfp); break;	
	  case '\n':	fputs_unfiltered ("\\n", serial_logfp); break;	
	  case '\r':	fputs_unfiltered ("\\r", serial_logfp); break;	
	  case '\t':	fputs_unfiltered ("\\t", serial_logfp); break;	
	  case '\v':	fputs_unfiltered ("\\v", serial_logfp); break;	
	  default:	fprintf_unfiltered (serial_logfp, isprint (ch) ? "%c" : "\\x%02x", ch & 0xFF); break;
	  }
	}
}

int
serial_write (scb, str, len)
     serial_t scb;
     const char *str;
     int len;
{
  int count;

  if (serial_logfp != NULL)
    {
      if (serial_reading)
	{
	  fputc_unfiltered ('\n', serial_logfp);
	  serial_reading = 0;
	}
      if (!serial_writing)
	{
	  fputs_unfiltered ("w ", serial_logfp);
	  serial_writing = 1;
	}
      for (count = 0; count < len; count++)
	{
	  serial_logchar (str[count] & 0xff, 0);
	}
      /* Make sure that the log file is as up-to-date as possible,
	 in case we are getting ready to dump core or something. */
      fflush (serial_logfp);
    }
  return (scb -> ops -> write (scb, str, len));
}

int
serial_readchar (scb, timeout)
     serial_t scb;
     int timeout;
{
  int ch;

  ch = scb -> ops -> readchar (scb, timeout);
  if (serial_logfp != NULL)
    {
      if (serial_writing)
	{
	  fputc_unfiltered ('\n', serial_logfp);
	  serial_writing = 0;
	}
      if (!serial_reading)
	{
	  fputs_unfiltered ("r ", serial_logfp);
	  serial_reading = 1;
	}
      serial_logchar (ch, timeout);
      /* Make sure that the log file is as up-to-date as possible,
	 in case we are getting ready to dump core or something. */
      fflush (serial_logfp);
    }
  return (ch);
}

int
serial_send_break (scb)
     serial_t scb;
{
  if (serial_logfp != NULL)
    {
      if (serial_reading)
	{
	  fputc_unfiltered ('\n', serial_logfp);
	  serial_reading = 0;
	}
      if (!serial_writing)
	{
	  fputs_unfiltered ("w ", serial_logfp);
	  serial_writing = 1;
	}
      serial_logchar (SERIAL_BREAK, 0);
      /* Make sure that the log file is as up-to-date as possible,
	 in case we are getting ready to dump core or something. */
      fflush (serial_logfp);
    }
  return (scb -> ops -> send_break (scb));
}

static struct serial_ops *
serial_interface_lookup (name)
     char *name;
{
  struct serial_ops *ops;
  DBG(("serial_interface_lookup(%s)\n",name));

  for (ops = serial_ops_list; ops; ops = ops->next)
    if (strcmp (name, ops->name) == 0)
      return ops;

  DBG(("serial_interface_lookup: %s not found!\n",name));
  return NULL;
}

void
serial_add_interface(optable)
     struct serial_ops *optable;
{
  optable->next = serial_ops_list;
  serial_ops_list = optable;
}

/* Open up a device or a network socket, depending upon the syntax of NAME. */

serial_t
serial_open (name)
     const char *name;
{
  serial_t scb;
  struct serial_ops *ops;

  DBG(("serial_open\n"));
  for (scb = scb_base; scb; scb = scb->next)
    if (scb->name && strcmp (scb->name, name) == 0)
      {
	scb->refcnt++;
        DBG(("serial_open: scb %s found\n", name));
	return scb;
      }

  if (strcmp (name, "pc") == 0)
    ops = serial_interface_lookup ("pc");
  else if (strchr (name, ':'))
    ops = serial_interface_lookup ("tcp");
  else if (strncmp (name, "lpt", 3) == 0)
    ops = serial_interface_lookup ("parallel");
  else
    ops = serial_interface_lookup ("hardwire");

  if (!ops)
  {
    DBG(("serial_open: !ops; returning NULL\n"));
    return NULL;
  }

  scb = (serial_t)xmalloc (sizeof (struct _serial_t));

  scb->ops = ops;

  scb->bufcnt = 0;
  scb->bufp = scb->buf;

  if (scb->ops->open(scb, name))
    {
      free (scb);
      DBG(("serial_open: scb->ops->open failed!\n"));
      return NULL;
    }

  scb->name = strsave (name);
  scb->next = scb_base;
  scb->refcnt = 1;
  scb_base = scb;

  last_serial_opened = scb;

  if (serial_logfile != NULL)
    {
      serial_logfp = fopen (serial_logfile, "w");
      if (serial_logfp == NULL)
	{
          DBG(("serial_open: unable to open serial logfile %s!\n",serial_logfile));
	  perror_with_name (serial_logfile);
	}
    }

  DBG(("serial_open: Done! :-)\n"));
  return scb;
}

serial_t
serial_fdopen (fd)
     const int fd;
{
  serial_t scb;
  struct serial_ops *ops;
  DBG(("serial_fdopen\n"));

  for (scb = scb_base; scb; scb = scb->next)
    if (scb->fd == fd)
      {
	scb->refcnt++;
	return scb;
      }

  ops = serial_interface_lookup ("hardwire");

  if (!ops)
    return NULL;

  scb = (serial_t)xmalloc (sizeof (struct _serial_t));

  scb->ops = ops;

  scb->bufcnt = 0;
  scb->bufp = scb->buf;

  scb->fd = fd;

  scb->name = NULL;
  scb->next = scb_base;
  scb->refcnt = 1;
  scb_base = scb;

  last_serial_opened = scb;

  return scb;
}

void
serial_close(scb, really_close)
     serial_t scb;
     int really_close;
{
  serial_t tmp_scb;

  last_serial_opened = NULL;

  if (serial_logfp)
    {
      if (serial_reading || serial_writing)
	{
	  fputc_unfiltered ('\n', serial_logfp);
	  serial_reading = 0;
	  serial_writing = 0;
	}
      fclose (serial_logfp);
      serial_logfp = NULL;
    }

/* This is bogus.  It's not our fault if you pass us a bad scb...!  Rob, you
   should fix your code instead.  */

  if (!scb)
    return;

  scb->refcnt--;
  if (scb->refcnt > 0)
    return;

  if (really_close)
    scb->ops->close (scb);

  if (scb->name)
    free (scb->name);

  if (scb_base == scb)
    scb_base = scb_base->next;
  else
    for (tmp_scb = scb_base; tmp_scb; tmp_scb = tmp_scb->next)
      {
	if (tmp_scb->next != scb)
	  continue;

	tmp_scb->next = tmp_scb->next->next;
	break;
      }

  free(scb);
}

#if 0
/*
The connect command is #if 0 because I hadn't thought of an elegant
way to wait for I/O on two serial_t's simultaneously.  Two solutions
came to mind:

	1) Fork, and have have one fork handle the to user direction,
	   and have the other hand the to target direction.  This
	   obviously won't cut it for MSDOS.

	2) Use something like select.  This assumes that stdin and
	   the target side can both be waited on via the same
	   mechanism.  This may not be true for DOS, if GDB is
	   talking to the target via a TCP socket.
-grossman, 8 Jun 93
*/

/* Connect the user directly to the remote system.  This command acts just like
   the 'cu' or 'tip' command.  Use <CR>~. or <CR>~^D to break out.  */

static serial_t tty_desc;		/* Controlling terminal */

static void
cleanup_tty(ttystate)
     serial_ttystate ttystate;
{
  printf_unfiltered ("\r\n[Exiting connect mode]\r\n");
  SERIAL_SET_TTY_STATE (tty_desc, ttystate);
  free (ttystate);
  SERIAL_CLOSE (tty_desc);
}

static void
connect_command (args, fromtty)
     char	*args;
     int	fromtty;
{
  int c;
  char cur_esc = 0;
  serial_ttystate ttystate;
  serial_t port_desc;		/* TTY port */
  DBG(("connect_command\n"));

  dont_repeat();

  if (args)
    fprintf_unfiltered(gdb_stderr, "This command takes no args.  They have been ignored.\n");
	
  printf_unfiltered("[Entering connect mode.  Use ~. or ~^D to escape]\n");

  tty_desc = SERIAL_FDOPEN (0);
  port_desc = last_serial_opened;

  ttystate = SERIAL_GET_TTY_STATE (tty_desc);

  SERIAL_RAW (tty_desc);
  SERIAL_RAW (port_desc);

  make_cleanup (cleanup_tty, ttystate);

  while (1)
    {
      int mask;

      mask = SERIAL_WAIT_2 (tty_desc, port_desc, -1);

      if (mask & 2)
	{			/* tty input */
	  char cx;

	  while (1)
	    {
	      c = SERIAL_READCHAR(tty_desc, 0);

	      if (c == SERIAL_TIMEOUT)
		  break;

	      if (c < 0)
		perror_with_name("connect");

	      cx = c;
	      SERIAL_WRITE(port_desc, &cx, 1);

	      switch (cur_esc)
		{
		case 0:
		  if (c == '\r')
		    cur_esc = c;
		  break;
		case '\r':
		  if (c == '~')
		    cur_esc = c;
		  else
		    cur_esc = 0;
		  break;
		case '~':
		  if (c == '.' || c == '\004')
		    return;
		  else
		    cur_esc = 0;
		}
	    }
	}

      if (mask & 1)
	{			/* Port input */
	  char cx;

	  while (1)
	    {
	      c = SERIAL_READCHAR(port_desc, 0);

	      if (c == SERIAL_TIMEOUT)
		  break;

	      if (c < 0)
		perror_with_name("connect");

	      cx = c;

	      SERIAL_WRITE(tty_desc, &cx, 1);
	    }
	}
    }
}
#endif /* 0 */

/* VARARGS */
void
#ifdef ANSI_PROTOTYPES
serial_printf (serial_t desc, const char *format, ...)
#else
serial_printf (va_alist)
     va_dcl
#endif
{
  va_list args;
  char *buf;
#ifdef ANSI_PROTOTYPES
  va_start (args, format);
#else
  serial_t desc;
  char *format;

  va_start (args);
  desc = va_arg (args, serial_t);
  format = va_arg (args, char *);
#endif

  vasprintf (&buf, format, args);
  SERIAL_WRITE (desc, buf, strlen (buf));

  free (buf);
  va_end (args);
}

void
_initialize_serial ()
{
  struct cmd_list_element *cmd;

#if 0
  add_com ("connect", class_obscure, connect_command,
	   "Connect the terminal directly up to the command monitor.\n\
Use <CR>~. or <CR>~^D to break out.");
#endif /* 0 */

  add_show_from_set (add_set_cmd ("remotelogfile", no_class,
				  var_filename, (char *)&serial_logfile,
				  "Set filename for remote session recording.\n\
This file is used to record the remote session for future playback\n\
by gdbserver.", &setlist),
		     &showlist);

  add_show_from_set (add_set_enum_cmd ("remotelogbase", no_class,
				       logbase_enums,
				       (char *)&serial_logbase,
				       "Set ...",
				       &setlist),
			   &showlist);
}