source: trunk/third/libgtop/lib/parameter.c @ 20897

/* $Id: parameter.c,v 1.1.1.2 2004-10-03 04:59:47 ghudson Exp $ */

/* Copyright (C) 1998-99 Martin Baulig
   This file is part of LibGTop 1.0.

   Contributed by Martin Baulig <martin@home-of-linux.org>, April 1998.

   LibGTop 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.

   LibGTop 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 LibGTop; see the file COPYING. If not, write to the
   Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.
*/

#include <glibtop.h>
#include <glibtop/parameter.h>

#define _write_data(ptr,size)   \
        if ((data_ptr == NULL) || (data_size < size)) return -size; \
        if (ptr == NULL) { char * const p = data_ptr; *p = '\0'; return 1; } \
        memcpy (data_ptr, ptr, size);   \
        return size;

#define _check_data(size)       \
        if ((data_ptr == NULL) || (data_size != size)) { \
                glibtop_warn_r (server, "glibtop_set_parameter (%d): " \
                                "Expected %lu bytes but got %lu.", \
                                parameter, size, data_size); \
                return; \
        }

#define _strlen(ptr)    (ptr ? strlen (ptr) : 0)

size_t
glibtop_get_parameter_l (glibtop *server, const unsigned parameter,
                         void *data_ptr, size_t data_size)
{
        switch (parameter) {
        case GLIBTOP_PARAM_METHOD:
                _write_data (&server->method,
                             sizeof (server->method));
        case GLIBTOP_PARAM_FEATURES:
                _write_data (&server->features,
                             sizeof (server->features));
        case GLIBTOP_PARAM_COMMAND:
                _write_data (server->server_command,
                             _strlen(server->server_command));
        case GLIBTOP_PARAM_HOST:
                _write_data (server->server_host,
                             _strlen(server->server_host));
        case GLIBTOP_PARAM_PORT:
                _write_data (&server->server_port,
                             sizeof (server->server_port));
        case GLIBTOP_PARAM_ERROR_METHOD:
                _write_data (&server->error_method,
                             sizeof (server->error_method));
        case GLIBTOP_PARAM_REQUIRED:
                _write_data (&server->required,
                             sizeof (server->required));
        }

        return 0;
}

void
glibtop_set_parameter_l (glibtop *server, const unsigned parameter,
                         const void *data_ptr, size_t data_size)
{
        switch (parameter) {
        case GLIBTOP_PARAM_METHOD:
                _check_data (sizeof (server->method));
                memcpy (&server->method, data_ptr, data_size);
                break;
        case GLIBTOP_PARAM_FEATURES:
                /* You should not be allowed to set this field. */
                glibtop_warn_r (server, "glibtop_set_parameter (%d): " \
                                "Cannot modify read-only value.",
                                parameter);
                break;
        case GLIBTOP_PARAM_ERROR_METHOD:
                _check_data (sizeof (server->error_method));
                memcpy (&server->error_method, data_ptr, data_size);
                break;
        case GLIBTOP_PARAM_REQUIRED:
                _check_data (sizeof (server->required));
                memcpy (&server->required, data_ptr, data_size);
                break;
        }
}