/* Test setvbuf on readonly fopen (using mmap stdio).

   Copyright (C) 2002-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Jakub Jelinek <jakub@redhat.com>, 2002.

   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

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

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

int main (void)

{

  char name[] = "/tmp/tst-mmap-setvbuf.XXXXXX";

  char buf[4096];

  const char * const test = "Let's see if mmap stdio works with setvbuf.\n";

  char temp[strlen (test) + 1];

  int fd = mkstemp (name);

  FILE *f;

  if (fd == -1)

    {

      printf ("%u: cannot open temporary file: %m\n", __LINE__);

      exit (1);

    }

  f = fdopen (fd, "w");

  if (f == NULL)

    {

      printf ("%u: cannot fdopen temporary file: %m\n", __LINE__);

      exit (1);

    }

  fputs (test, f);

  fclose (f);

  f = fopen (name, "rm");

  if (f == NULL)

    {

      printf ("%u: cannot fopen temporary file: %m\n", __LINE__);

      exit (1);

    }

  if (setvbuf (f, buf, _IOFBF, sizeof buf))

    {

      printf ("%u: setvbuf failed: %m\n", __LINE__);

      exit (1);

    }

  if (fread (temp, 1, strlen (test), f) != strlen (test))

    {

      printf ("%u: couldn't read the file back: %m\n", __LINE__);

      exit (1);

    }

  temp [strlen (test)] = '\0';

  if (strcmp (test, temp))

    {

      printf ("%u: read different string than was written:\n%s%s",

	      __LINE__, test, temp);

      exit (1);

    }

  fclose (f);

  unlink (name);

  exit (0);

}