event_attr_confreg.c

Go to the documentation of this file.

/*
** Copyright (C) 2005 by Kevin L. Mitchell <klmitch@mit.edu>
**
** 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
**
** @(#)$Id: event_attr_confreg.c,v 1.2 2005/06/05 03:56:32 klmitch Exp $
*/
#include "event_int.h"

#include <stdlib.h>
#include <string.h>

RCSTAG("@(#)$Id: event_attr_confreg.c,v 1.2 2005/06/05 03:56:32 klmitch Exp $");

ev_err_t
event_attr_confreg(ev_attr_t *attr, const char *name, const char *def,
                   treeconf_nodown_t nodown, treeconf_change_t change,
                   void *assoc)
{
  int cmp;
  ev_varlist_t **ptr, *tmp;

  ev_init(); /* initialize library... */

  if (!ea_verify(attr) || !name || /* must be a valid attr */
      /* Don't let the application register variables under the event
       * hierarchy.  (sizeof(PACKAGE_TARNAME) will include the \0,
       * standing in for the "."...
       */
      !strncmp(name, PACKAGE_TARNAME ".", sizeof(PACKAGE_TARNAME)))
    ev_return(EINVAL);

  /* Now, walk the linked list, looking for a variable match and ordering */
  for (ptr = &(ea_varlist(attr)); *ptr; ptr = &(*ptr)->vl_next)
    if (!(cmp = strcmp((*ptr)->vl_name, name)))
      ev_return(TC_ERR_MULTREG); /* exact match; reject it */
    else if (cmp > 0) /* this entry is larger than what we're inserting */
      break; /* so break out of the loop and we'll insert before it */

  /* OK, now let's allocate a varlist element and initialize it... */
  if (!(tmp = (ev_varlist_t *)malloc(sizeof(ev_varlist_t))))
    ev_return(ENOMEM);

  /* Now, let's initialize it for its new place in the list... */
  tmp->vl_next = *ptr;
  tmp->vl_prev_p = ptr;
  tmp->vl_name = name;
  tmp->vl_default = def;
  tmp->vl_nodown = nodown;
  tmp->vl_change = change;
  tmp->vl_assoc = assoc;

  /* And, finally, insert it into the list */
  *ptr = tmp;

  ev_return(0);
}

---