/* wrappi
 * Copyright (C) 2011-2012 Red Hat Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <config.h>

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

#include "wrappi.h"
#include "internal.h"

wrap_h *
wrap_create (void)
{
  struct wrap_h *w = calloc (1, sizeof *w);
  if (w == NULL)
    return NULL;

  return w;
}

void
wrap_close (wrap_h *w)
{
  free (w);
}

static void
set_error_buf (struct wrap_internal_h *w,
               char *buf, int errnum, const char *func)
{
  free (w->error);
  w->error = buf;
  w->errnum = errnum;

  /* 'func' is always statically allocated, since it comes from
   * C99 __func__, so this is safe.
   */
  if (STRPREFIX (func, "impl_"))
    func += 5;
  else if (STRPREFIX (func, "wrap_"))
    func += 5;
  w->error_func = func;

  /* XXX This will be conditional on the user setting an error handler. */
  fprintf (stderr, "wrappi: %s: %s\n", func, buf);
}

void
wrap_int_set_error (struct wrap_internal_h *w,
                    const char *func,
                    const char *fs, ...)
{
  va_list args;
  char *msg;
  int err;

  va_start (args, fs);
  err = vasprintf (&msg, fs, args);
  va_end (args);

  if (err < 0) return;

  set_error_buf (w, msg, 0, func);
}

void
wrap_int_set_error_errno (struct wrap_internal_h *w,
                          int errnum,
                          const char *func,
                          const char *fs, ...)
{
  va_list args;
  char *msg;
  int err;

  va_start (args, fs);
  err = vasprintf (&msg, fs, args);
  va_end (args);

  if (err < 0) return;

  set_error_buf (w, msg, errnum, func);
}