/* Derived from the test case in

   https://sourceware.org/bugzilla/show_bug.cgi?id=1078.  */

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#define OUT_SIZE 10000

static int fd;

static void prepare (void);

#define PREPARE(argc, argv) prepare ()

static int do_test (void);

#define TEST_FUNCTION do_test ()

#include "../test-skeleton.c"

static void

prepare (void)

{

  fd = create_temp_file ("tst-fwrite.", NULL);

  if (fd == -1)

    {

      puts ("cannot create temporary file");

      exit (1);

    }

}

static int

do_test (void)

{

  FILE* f = fdopen (fd, "w+");

  if (f == NULL) {

    puts ("cannot create stream");

    return 1;

  }

  puts ("Opened temp file");

  if (fwrite ("a", 1, 1, f) != 1)

    {

      puts ("1st fwrite failed");

      return 1;

    }

  puts ("Wrote a byte");

  fflush (f);

  char buffer[10000];

  size_t i = fread (buffer, 1, sizeof (buffer), f);

  printf ("Read %zu bytes\n", i);

  for (i = 0; i < OUT_SIZE; i++)

    {

      if (fwrite ("n", 1, 1, f) != 1)

	{

	  printf ("fwrite in loop round %zu failed\n", i);

	  return 1;

	}

      if ((i + 1) % 1000 == 0)

	printf ("wrote %zu bytes ...\n", i + 1);

    }

  printf ("Wrote %i bytes [done]\n", OUT_SIZE);

  return 0;

}