/****************************************************************************
 * libs/libc/builtin/lib_builtin_isavail.c
 *
 * Originally by:
 *
 *   Copyright (C) 2011 Uros Platise. All rights reserved.
 *   Author: Uros Platise <uros.platise@isotel.eu>
 *
 * With subsequent updates, modifications, and general maintenance by:
 *
 *   Copyright (C) 2012-2013, 2019 Gregory Nutt.  All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <string.h>
#include <limits.h>
#include <errno.h>

#include <nuttx/lib/builtin.h>

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: builtin_isavail
 *
 * Description:
 *   Checks for availability of an application named 'appname' registered
 *   during compile time and, if available, returns the index into the table
 *   of built-in applications.
 *
 * Input Parameters:
 *   filename - Name of the linked-in binary to be started.
 *
 * Returned Value:
 *   This is an internal function, used by by the NuttX binfmt logic and
 *   by the application built-in logic.  It returns a non-negative index to
 *   the application entry in the table of built-in applications on success
 *   or a negated errno value in the event of a failure.
 *
 ****************************************************************************/

int builtin_isavail(FAR const char *appname)
{
  FAR const char *name;
  int i;

  for (i = 0; (name = builtin_getname(i)) != NULL; i++)
    {
      if (strncmp(name, appname, NAME_MAX) == 0)
        {
          return i;
        }
    }

  return -ENOENT;
}