#include <fcntl.h>

#include <stdio.h>

#include <string.h>

#include <unistd.h>

static int fd;

static char *fname;

static void prepare (void);

#define PREPARE(argc, argv) prepare ()

#define TEST_FUNCTION do_test ()

static int do_test (void);

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

static void

prepare (void)

{

  fd = create_temp_file ("wrewind.", &fname);

  if (fd == -1)

    exit (3);

}

static int

do_test (void)

{

  char buf[100];

  FILE *fp;

  int result = 0;

  fp = fdopen (fd, "w");

  if (fp == NULL)

    {

      puts ("cannot create file");

      exit (1);

    }

  if (fputs ("one\n", fp) == EOF || fputs ("two\n", fp) == EOF)

    {

      puts ("cannot create filec content");

      exit (1);

    }

  fclose (fp);

  fp = fopen (fname, "a+");

  if (fp == NULL)

    {

      puts ("cannot fopen a+");

      exit (1);

    }

  if (fgets (buf, sizeof (buf), fp) == NULL)

    {

      puts ("cannot read after fopen a+");

      exit (1);

    }

  if (strcmp (buf, "one\n") != 0)

    {

      puts ("read after fopen a+ produced wrong result");

      result = 1;

    }

  fclose (fp);

  fd = open (fname, O_RDWR);

  if (fd == -1)

    {

      puts ("open failed");

      exit (1);

    }

  fp = fdopen (fd, "a+");

  if (fp == NULL)

    {

      puts ("fopen after open failed");

      exit (1);

    }

  if (fgets (buf, sizeof (buf), fp) == NULL)

    {

      puts ("cannot read after fdopen a+");

      exit (1);

    }

  if (strcmp (buf, "one\n") != 0)

    {

      puts ("read after fdopen a+ produced wrong result");

      result = 1;

    }

  fclose (fp);

  return result;

}