/* nbdkit
 * Copyright Red Hat
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * * 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.
 *
 * * Neither the name of Red Hat 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 RED HAT 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 RED HAT 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.
 */

#include <config.h>

#include <stdio.h>
#include <stdlib.h>

#include "plugin.h"

/* Is a callback defined? */
int
callback_defined (const char *name, PyObject **obj_rtn)
{
  PyObject *obj;

  assert (script != NULL);
  assert (module != NULL);

  obj = PyObject_GetAttrString (module, name);
  if (!obj) {
    PyErr_Clear (); /* Clear the AttributeError from testing attr. */
    return 0;
  }
  if (!PyCallable_Check (obj)) {
    nbdkit_debug ("object %s isn't callable", name);
    Py_DECREF (obj);
    return 0;
  }

  if (obj_rtn != NULL)
    *obj_rtn = obj;
  else
    Py_DECREF (obj);

  return 1;
}

/* Convert bytes/str/unicode into a string.  Caller must free. */
char *
python_to_string (PyObject *str)
{
  if (str) {
    if (PyUnicode_Check (str))
      return strdup (PyUnicode_AsUTF8 (str));
    else if (PyBytes_Check (str))
      return strdup (PyBytes_AS_STRING (str));
  }
  return NULL;
}
