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/*  communicate.c -- ARMulator RDP comms code:  ARM6 Instruction Emulator.

    Copyright (C) 1994 Advanced RISC Machines Ltd.

    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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */

/**************************************************************************/

/* Functions to read and write characters or groups of characters         */

/* down sockets or pipes.  Those that return a value return -1 on failure */

/* and 0 on success.                                                      */

/**************************************************************************/

#include <sys/time.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include "armdefs.h"

/* The socket to the debugger */

int debugsock;

/* The maximum number of file descriptors */

extern int nfds;

/* The socket handle */

extern int sockethandle;

/* Read and Write routines down a pipe or socket */

/****************************************************************/

/* Read an individual character.                                */

/* All other read functions rely on this one.                   */

/* It waits 15 seconds until there is a character available: if */

/* no character is available, then it timeouts and returns -1.  */

/****************************************************************/

int

MYread_char (int sock, unsigned char *c)

{

  int i;

  fd_set readfds;

  struct timeval timeout = { 15, 0 };

  struct sockaddr_in isa;

retry:

  FD_ZERO (&readfds);

  FD_SET (sock, &readfds);

  i = select (nfds, &readfds, (fd_set *) 0, (fd_set *) 0, &timeout);

  if (i < 0)

    {

      perror ("select");

      exit (1);

    }

  if (!i)

    {

      fprintf (stderr, "read: Timeout\n");

      return -1;

    }

  if ((i = read (sock, c, 1)) < 1)

    {

      if (!i && sock == debugsock)

        {

          fprintf (stderr, "Connection with debugger severed.\n");

          /* This shouldn't be necessary for a detached armulator, but

             the armulator cannot be cold started a second time, so

             this is probably preferable to locking up.  */

          return -1;

          fprintf (stderr, "Waiting for connection from debugger...");

          debugsock = accept (sockethandle, &isa, &i);

          if (debugsock < 0)

            {                   /* Now we are in serious trouble... */

              perror ("accept");

              return -1;

            }

          fprintf (stderr, " done.\nConnection Established.\n");

          sock = debugsock;

          goto retry;

        }

      perror ("read");

      return -1;

    }

#ifdef DEBUG

  if (sock == debugsock)

    fprintf (stderr, "<%02x ", *c);

#endif

  return 0;

}

/****************************************************************/

/* Read an individual character.                                */

/* It waits until there is a character available. Returns -1 if */

/* an error occurs.                                             */

/****************************************************************/

int

MYread_charwait (int sock, unsigned char *c)

{

  int i;

  fd_set readfds;

  struct sockaddr_in isa;

retry:

  FD_ZERO (&readfds);

  FD_SET (sock, &readfds);

  i = select (nfds, &readfds,

              (fd_set *) 0, (fd_set *) 0, (struct timeval *) 0);

  if (i < 0)

    {

      perror ("select");

      exit (-1);

    }

  if ((i = read (sock, c, 1)) < 1)

    {

      if (!i && sock == debugsock)

        {

          fprintf (stderr, "Connection with debugger severed.\n");

          return -1;

          fprintf (stderr, "Waiting for connection from debugger...");

          debugsock = accept (sockethandle, &isa, &i);

          if (debugsock < 0)

            {                   /* Now we are in serious trouble... */

              perror ("accept");

              return -1;

            }

          fprintf (stderr, " done.\nConnection Established.\n");

          sock = debugsock;

          goto retry;

        }

      perror ("read");

      return -1;

    }

#ifdef DEBUG

  if (sock == debugsock)

    fprintf (stderr, "<%02x ", *c);

#endif

  return 0;

}

void

MYwrite_char (int sock, unsigned char c)

{

  if (write (sock, &c, 1) < 1)

    perror ("write");

#ifdef DEBUG

  if (sock == debugsock)

    fprintf (stderr, ">%02x ", c);

#endif

}

int

MYread_word (int sock, ARMword * here)

{

  unsigned char a, b, c, d;

  if (MYread_char (sock, &a) < 0)

    return -1;

  if (MYread_char (sock, &b) < 0)

    return -1;

  if (MYread_char (sock, &c) < 0)

    return -1;

  if (MYread_char (sock, &d) < 0)

    return -1;

  *here = a | b << 8 | c << 16 | d << 24;

  return 0;

}

void

MYwrite_word (int sock, ARMword i)

{

  MYwrite_char (sock, i & 0xff);

  MYwrite_char (sock, (i & 0xff00) >> 8);

  MYwrite_char (sock, (i & 0xff0000) >> 16);

  MYwrite_char (sock, (i & 0xff000000) >> 24);

}

void

MYwrite_string (int sock, char *s)

{

  int i;

  for (i = 0; MYwrite_char (sock, s[i]), s[i]; i++);

}

int

MYread_FPword (int sock, char *putinhere)

{

  int i;

  for (i = 0; i < 16; i++)

    if (MYread_char (sock, &putinhere[i]) < 0)

      return -1;

  return 0;

}

void

MYwrite_FPword (int sock, char *fromhere)

{

  int i;

  for (i = 0; i < 16; i++)

    MYwrite_char (sock, fromhere[i]);

}

/* Takes n bytes from source and those n bytes */

/* down to dest */

int

passon (int source, int dest, int n)

{

  char *p;

  int i;

  p = (char *) malloc (n);

  if (!p)

    {

      perror ("Out of memory\n");

      exit (1);

    }

  if (n)

    {

      for (i = 0; i < n; i++)

        if (MYread_char (source, &p[i]) < 0)

          return -1;

#ifdef DEBUG

      if (dest == debugsock)

        for (i = 0; i < n; i++)

          fprintf (stderr, ")%02x ", (unsigned char) p[i]);

#endif

      write (dest, p, n);

    }

  free (p);

  return 0;

}