/* Open an nss_files database file.

   Copyright (C) 2020 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C 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 2.1 of the License, or (at your option) any later version.

   The GNU C 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 the GNU C Library; if not, see

   <https://www.gnu.org/licenses/>.  */

#include <nss_files.h>

#include <errno.h>

#include <stdio_ext.h>

FILE *

__nss_files_fopen (const char *path)

{

  FILE *fp = fopen (path, "rce");

  if (fp == NULL)

    return NULL;

  /* The stream is not shared across threads.  */

  __fsetlocking (fp, FSETLOCKING_BYCALLER);

  /* This tells libio that the file is seekable, and that fp->_offset

     is correct, ensuring that __ftello64 is efficient (bug 26257).  */

  if (__fseeko64 (fp, 0, SEEK_SET) < 0)

    {

      /* nss_files requires seekable files, to deal with repeated

         reads of the same line after reporting ERANGE.  */

      fclose (fp);

      __set_errno (ESPIPE);

      return NULL;

    }

  return fp;

}

libc_hidden_def (__nss_files_fopen)