eliminate use of the `register' keyword: let the compiler decide

[moira.git] / lib / mr_ops.c

/*
 *	$Source$
 *	$Author$
 *	$Header$
 *
 *	Copyright (C) 1987, 1989, 1990 by the Massachusetts Institute of
 *	Technology
 *	For copying and distribution information, please see the file
 *	<mit-copyright.h>.
 *
 * 	This routine is part of the client library.  It handles
 *	the protocol operations: invoking an update and getting the
 *	MR message of the day.
 */

#ifndef lint
static char *rcsid_sms_do_update_c = "$Header$";
#endif

#include <mit-copyright.h>
#include <string.h>
#include "mr_private.h"


/* Invoke a DCM update. */

int mr_do_update(void)
{
  int status;
  mr_params param_st;
  struct mr_params *params = NULL;
  struct mr_params *reply = NULL;

  CHECK_CONNECTED;
  params = &param_st;
  params->mr_version_no = sending_version_no;
  params->mr_procno = MR_DO_UPDATE;
  params->mr_argc = 0;
  params->mr_argl = NULL;
  params->mr_argv = NULL;

  if ((status = mr_do_call(params, &reply)) == 0)
    status = reply->mr_status;

  mr_destroy_reply(reply);

  return status;
}


/* Get the MR motd.  This returns an MR status, and motd will either
 * point to NULL or the motd in a static buffer.
 */

int mr_motd(char **motd)
{
  int status;
  mr_params param_st;
  struct mr_params *params = NULL;
  struct mr_params *reply = NULL;
  static char buffer[1024];

  *motd = NULL;
  CHECK_CONNECTED;
  params = &param_st;
  params->mr_version_no = sending_version_no;
  params->mr_procno = MR_MOTD;
  params->mr_argc = 0;
  params->mr_argl = NULL;
  params->mr_argv = NULL;

  if ((status = mr_do_call(params, &reply)))
    goto punt;

  while ((status = reply->mr_status) == MR_MORE_DATA)
    {
      if (reply->mr_argc > 0)
	{
	  strncpy(buffer, reply->mr_argv[0], sizeof(buffer));
	  *motd = buffer;
	}
      mr_destroy_reply(reply);
      reply = NULL;

      initialize_operation(_mr_recv_op, mr_start_recv, &reply, NULL);
      queue_operation(_mr_conn, CON_INPUT, _mr_recv_op);

      mr_complete_operation(_mr_recv_op);
      if (OP_STATUS(_mr_recv_op) != OP_COMPLETE)
	{
	  mr_disconnect();
	  status = MR_ABORTED;
	  return status;
	}
    }
punt:
  mr_destroy_reply(reply);
  /* for backwards compatability */
  if (status == MR_UNKNOWN_PROC)
    return 0;
  else
    return status;
}


/* Tell the library to take care of another input source while it is
 * processing a query.  For instance, an X toolkit application would
 * do something like
 *    mr_set_alternate_input(ConnectionNumber(XtDisplay(widget)), doxinput);
 * where doxinput is defined as:
 *    doxinput() {
 *	extern Widget toplevel;
 *	XEvent event;
 *	while (XPending(XtDisplay(toplevel))) {
 *	    XNextEvent(XtDisplay(toplevel), &event);
 *	    XtDispatchEvent(&event);
 *      }
 *      XFlush(XtDisplay(toplevel));
 *    }
 */

static int mr_alternate_input = 0;
static int (*mr_alternate_handler)();

int mr_set_alternate_input(int fd, int (*proc)())
{
  if (mr_alternate_input != 0)
    return MR_ALREADY_CONNECTED;
  mr_alternate_input = fd;
  mr_alternate_handler = proc;
  return MR_SUCCESS;
}


/* This is used by the parts of the library that must wait for GDB.  It
 * handles alternate input streams (such as X) as well.
 */

int mr_complete_operation(OPERATION op)
{
  long infd, outfd, exfd;
  int rc;

  gdb_progress();		/* try for an immediate completion */

  if (mr_alternate_input == 0)
    return complete_operation(op);

  infd = 1 << mr_alternate_input;
  outfd = exfd = 0;

  while (op->status != OP_COMPLETE && op->status != OP_CANCELLED)
    {
      rc = con_select(mr_alternate_input, (fd_set *)&infd, (fd_set *)&outfd,
		      (fd_set *)&exfd, NULL);
      if (rc > 0 && mr_alternate_handler)
	(*mr_alternate_handler)();
    }
  return op->status;
}