darling-gdb/gdb/ser-mac.c

/* Remote serial interface for local (hardwired) serial ports for Macintosh.
   Copyright 1994 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "defs.h"
#include "serial.h"

#include <Types.h>
#include <Devices.h>
#include <Serial.h>

/* This is unused for now.  We just return a placeholder. */

struct mac_ttystate
  {
    int bogus;
  };

static int mac_open PARAMS ((serial_t scb, const char *name));
static void mac_raw PARAMS ((serial_t scb));
static int mac_readchar PARAMS ((serial_t scb, int timeout));
static int mac_setbaudrate PARAMS ((serial_t scb, int rate));
static int mac_write PARAMS ((serial_t scb, const char *str, int len));
static void mac_close PARAMS ((serial_t scb));
static serial_ttystate mac_get_tty_state PARAMS ((serial_t scb));
static int mac_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
static char *aptr PARAMS ((short p));

short input_refnum;
short output_refnum;

char *mac_input_buffer;
char *mac_output_buffer;

static int
mac_open (scb, name)
     serial_t scb;
     const char *name;
{
  OSErr err;

  /* Alloc buffer space first - that way any allocation failures are
     intercepted before the serial driver gets involved. */
  if (mac_input_buffer == NULL)
    mac_input_buffer = (char *) xmalloc (256);
  /* Match on a name and open a port. */
  if (strcmp (name, "modem") == 0)
    {
      err = OpenDriver ("\p.AIn", &input_refnum);
      if (err != 0)
	{
	  return (-1);
	}
      err = OpenDriver ("\p.AOut", &output_refnum);
      if (err != 0)
	{
	  CloseDriver (input_refnum);
	  return (-1);
	}
    }
  else if (strcmp (name, "printer") == 0)
    {
      err = OpenDriver ("\p.BIn", &input_refnum);
      if (err != 0)
	{
	  return (-1);
	}
      err = OpenDriver ("\p.BOut", &output_refnum);
      if (err != 0)
	{
	  CloseDriver (input_refnum);
	  return (-1);
	}
      /* fake */
      scb->fd = 1;
      return 0;
    }
  else
    {
      errno = ENOENT;
      return (-1);
    }
  /* We got something open. */
  if (1 /* using custom buffer */)
    SerSetBuf (input_refnum, mac_input_buffer, 256);
  /* Set to a GDB-preferred state. */
  SerReset (input_refnum,  stop10|noParity|data8|baud9600);
  SerReset (output_refnum, stop10|noParity|data8|baud9600);
  {
    CntrlParam cb;
    struct SerShk *handshake;

    cb.ioCRefNum = output_refnum;
    cb.csCode = 14;
    handshake = (struct SerShk *) &cb.csParam[0];
    handshake->fXOn = 0;
    handshake->fCTS = 0;
    handshake->xOn = 0;
    handshake->xOff = 0;
    handshake->errs = 0;
    handshake->evts = 0;
    handshake->fInX = 0;
    handshake->fDTR = 0;
    err = PBControl ((ParmBlkPtr) &cb, 0);
    if (err < 0)
      return (-1);
  }
  /* fake */
  scb->fd = 1;
  return 0;
}

static int
mac_noop (scb)
     serial_t scb;
{
  return 0;
}

static void
mac_raw (scb)
     serial_t scb;
{
  /* Always effectively in raw mode. */
}

/* Read a character with user-specified timeout.  TIMEOUT is number of seconds
   to wait, or -1 to wait forever.  Use timeout of 0 to effect a poll.  Returns
   char if successful.  Returns -2 if timeout expired, EOF if line dropped
   dead, or -3 for any other error (see errno in that case). */

static int
mac_readchar (scb, timeout)
     serial_t scb;
     int timeout;
{
  int status, n;
  /* time_t */ unsigned long starttime, now;
  OSErr err;
  CntrlParam cb;
  IOParam pb;

  if (scb->bufcnt-- > 0)
    return *scb->bufp++;

  time (&starttime);

  while (1)
    {
      cb.ioCRefNum = input_refnum;
      cb.csCode = 2;
      err = PBStatus ((ParmBlkPtr) &cb, 0);
      if (err < 0)
	return SERIAL_ERROR;
      n = *((long *) &cb.csParam[0]);
      if (n > 0)
	{
	  pb.ioRefNum = input_refnum;
	  pb.ioBuffer = (Ptr) (scb->buf);
	  pb.ioReqCount = (n > 64 ? 64 : n);
	  err = PBRead ((ParmBlkPtr) &pb, 0);
	  if (err < 0)
	    return SERIAL_ERROR;
	  scb->bufcnt = pb.ioReqCount;
	  scb->bufcnt--;
	  scb->bufp = scb->buf;
	  return *scb->bufp++;
	}
      else if (timeout == 0)
	return SERIAL_TIMEOUT;
      else if (timeout == -1)
	;
      else
	{
	  time (&now);
	  if (now > starttime + timeout) {
	    printf_unfiltered ("start %u, now %u, timeout %d\n", starttime, now, timeout);
	    return SERIAL_TIMEOUT;
	  }
	}
    }
}

/* mac_{get set}_tty_state() are both dummys to fill out the function
   vector.  Someday, they may do something real... */

static serial_ttystate
mac_get_tty_state (scb)
     serial_t scb;
{
  struct mac_ttystate *state;

  state = (struct mac_ttystate *) xmalloc (sizeof *state);

  return (serial_ttystate) state;
}

static int
mac_set_tty_state (scb, ttystate)
     serial_t scb;
     serial_ttystate ttystate;
{
  return 0;
}

static int
mac_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
     serial_t scb;
     serial_ttystate new_ttystate;
     serial_ttystate old_ttystate;
{
  return 0;
}

static void
mac_print_tty_state (scb, ttystate)
     serial_t scb;
     serial_ttystate ttystate;
{
  /* Nothing to print.  */
  return;
}

static int
mac_set_baud_rate (scb, rate)
     serial_t scb;
     int rate;
{
  return 0;
}

static int
mac_write (scb, str, len)
     serial_t scb;
     const char *str;
     int len;
{
  OSErr err;
  IOParam pb;

  pb.ioRefNum = output_refnum;
  pb.ioBuffer = (Ptr) str;
  pb.ioReqCount = len;
  err = PBWrite ((ParmBlkPtr) &pb, 0);
  if (err < 0)
    {
      return 1;
    }
  return 0;
}

static void
mac_close (scb)
     serial_t scb;
{
  if (input_refnum)
    {
      if (1 /* custom buffer */)
	SerSetBuf (input_refnum, mac_input_buffer, 0);
      CloseDriver (input_refnum);
      input_refnum = 0;
    }
  if (output_refnum)
    {
      if (0 /* custom buffer */)
	SetSetBuf (input_refnum, mac_output_buffer, 0);
      CloseDriver (output_refnum);
      output_refnum = 0;
    }
}

static struct serial_ops mac_ops =
{
  "hardwire",
  0,
  mac_open,
  mac_close,
  mac_readchar,
  mac_write,
  mac_noop,			/* flush output */
  mac_noop,			/* flush input */
  mac_noop,			/* send break -- currently only for nindy */
  mac_raw,
  mac_get_tty_state,
  mac_set_tty_state,
  mac_print_tty_state,
  mac_noflush_set_tty_state,
  mac_set_baud_rate,
};

void
_initialize_ser_mac ()
{
  serial_add_interface (&mac_ops);
}