_ev_gen_lookup.c

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/*
** 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: _ev_gen_lookup.c,v 1.1 2005/07/11 23:34:32 klmitch Exp $
*/
#include "event_int.h"

RCSTAG("@(#)$Id: _ev_gen_lookup.c,v 1.1 2005/07/11 23:34:32 klmitch Exp $");

ev_err_t
_ev_gen_lookup(ev_ctx_t *ctx, unsigned int gentype, ev_gendesc_t **gen)
{
  ev_gens_t *gens;

  ev_init(); /* make sure library is initialized... */

  if (gentype > ctx->ec_maxgen) /* have we registered anything that high? */
    ev_return(ENOENT); /* nope, get out of here. */

  /* walk through list of generators... */
  for (gens = ctx->ec_gens; gens; gens = gens->gs_next) {
    if (gentype >= gens->gs_first && /* have we found it? */
        gentype < gens->gs_first + gens->gs_count) {
      *gen = &gens->gs_gens[gentype - gens->gs_first]; /* we have, return it */
      ev_return(0);
    }

    if (gentype < gens->gs_first || gentype < gens->gs_first + gens->gs_count)
      ev_return(ENOENT); /* short-circuit out of here... */
  }

  ev_return(ENOENT); /* failed to find the entry... */
}

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