/* Copyright (c) 2014, Michael Santos <michael.santos@gmail.com>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include "alcove.h"
#include "alcove_call.h"

#include <dirent.h>
#include <sys/stat.h>

/*
 * readdir(3)
 *
 */
ssize_t alcove_sys_readdir(alcove_state_t *ap, const char *arg, size_t len,
                           char *reply, size_t rlen) {
  int index = 0;
  int rindex = 0;

  char name[PATH_MAX] = {0};
  size_t namelen = sizeof(name) - 1;
  DIR *dirp = NULL;
  struct dirent *dent = NULL;

  UNUSED(ap);

  /* name */
  if (alcove_decode_iolist(arg, len, &index, name, &namelen) < 0 ||
      namelen == 0)
    return -1;

  dirp = opendir(name);

  if (dirp == NULL)
    return alcove_mk_errno(reply, rlen, errno);

  ALCOVE_ERR(alcove_encode_version(reply, rlen, &rindex));
  ALCOVE_ERR(alcove_encode_tuple_header(reply, rlen, &rindex, 2));
  ALCOVE_ERR(alcove_encode_atom(reply, rlen, &rindex, "ok"));

  errno = 0;
  while ((dent = readdir(dirp))) {
    ALCOVE_ERR(alcove_encode_list_header(reply, rlen, &rindex, 1));
    ALCOVE_ERR(alcove_encode_binary(reply, rlen, &rindex, dent->d_name,
                                    strlen(dent->d_name)));
  }

  if (errno != 0)
    return alcove_mk_errno(reply, rlen, errno);

  if (closedir(dirp) < 0)
    return alcove_mk_errno(reply, rlen, errno);

  ALCOVE_ERR(alcove_encode_empty_list(reply, rlen, &rindex));

  return rindex;
}