/* Common definitions for preadv and pwritev.

   Copyright (C) 2016-2018 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

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

#include <array_length.h>

#include <stdio.h>

#include <stdint.h>

#include <errno.h>

#include <string.h>

#include <sys/uio.h>

#include <sys/stat.h>

#include <support/check.h>

#include <support/temp_file.h>

#include <support/xunistd.h>

static char *temp_filename;

static int temp_fd;

static int do_test (void);

static void

do_prepare (int argc, char **argv)

{

  temp_fd = create_temp_file ("tst-preadvwritev.", &temp_filename);

  if (temp_fd == -1)

    FAIL_EXIT1 ("cannot create temporary file");

}

#define PREPARE do_prepare

#ifndef PREADV

# define PREADV(__fd, __iov, __iovcnt, __offset) \

  preadv (__fd, __iov, __iovcnt, __offset)

#endif

#ifndef PWRITEV

# define PWRITEV(__fd, __iov, __iovcnt, __offset) \

  pwritev (__fd, __iov, __iovcnt, __offset)

#endif

static __attribute__ ((unused)) void

do_test_without_offset (void)

{

  xftruncate (temp_fd, 0);

  xwrite (temp_fd, "123", 3);

  xlseek (temp_fd, 2, SEEK_SET);

  {

    struct iovec iov[] =

      {

        { (void *) "abc", 3 },

        { (void *) "xyzt", 4 },

      };

    TEST_COMPARE (PWRITEV (temp_fd, iov, array_length (iov), -1), 7);

  }

  TEST_COMPARE (xlseek (temp_fd, 0, SEEK_CUR), 9);

  xlseek (temp_fd, 1, SEEK_SET);

  char buf1[3];

  char buf2[2];

  {

    struct iovec iov[] =

      {

        { buf1, sizeof (buf1) },

        { buf2, sizeof (buf2) },

      };

    TEST_COMPARE (PREADV (temp_fd, iov, array_length (iov), -1),

                  sizeof (buf1) + sizeof (buf2));

    TEST_COMPARE (memcmp ("2ab", buf1, sizeof (buf1)), 0);

    TEST_COMPARE (memcmp ("cx", buf2, sizeof (buf2)), 0);

    TEST_COMPARE (xlseek (temp_fd, 0, SEEK_CUR), 6);

  }

  xftruncate (temp_fd, 0);

}

static int

do_test_with_offset (off_t offset)

{

  struct iovec iov[2];

  ssize_t ret;

  char buf1[32];

  char buf2[64];

  memset (buf1, 0xf0, sizeof buf1);

  memset (buf2, 0x0f, sizeof buf2);

  /* Write two buffer with 32 and 64 bytes respectively.  */

  memset (iov, 0, sizeof iov);

  iov[0].iov_base = buf1;

  iov[0].iov_len = sizeof buf1;

  iov[1].iov_base = buf2;

  iov[1].iov_len = sizeof buf2;

  ret = PWRITEV (temp_fd, iov, 2, offset);

  if (ret == -1)

    FAIL_RET ("first pwritev returned -1");

  if (ret != (sizeof buf1 + sizeof buf2))

    FAIL_RET ("first pwritev returned an unexpected value");

  ret = PWRITEV (temp_fd, iov, 2, sizeof buf1 + sizeof buf2 + offset);

  if (ret == -1)

    FAIL_RET ("second pwritev returned -1");

  if (ret != (sizeof buf1 + sizeof buf2))

    FAIL_RET ("second pwritev returned an unexpected value");

  char buf3[32];

  char buf4[64];

  memset (buf3, 0x0f, sizeof buf3);

  memset (buf4, 0xf0, sizeof buf4);

  iov[0].iov_base = buf3;

  iov[0].iov_len = sizeof buf3;

  iov[1].iov_base = buf4;

  iov[1].iov_len = sizeof buf4;

  /* Now read two buffer with 32 and 64 bytes respectively.  */

  ret = PREADV (temp_fd, iov, 2, offset);

  if (ret == -1)

    FAIL_RET ("first preadv returned -1");

  if (ret != (sizeof buf3 + sizeof buf4))

    FAIL_RET ("first preadv returned an unexpected value");

  if (memcmp (buf1, buf3, sizeof buf1) != 0)

    FAIL_RET ("first buffer from first preadv different than expected");

  if (memcmp (buf2, buf4, sizeof buf2) != 0)

    FAIL_RET ("second buffer from first preadv different than expected");

  ret = PREADV (temp_fd, iov, 2, sizeof buf3 + sizeof buf4 + offset);

  if (ret == -1)

    FAIL_RET ("second preadv returned -1");

  if (ret != (sizeof buf3 + sizeof buf4))

    FAIL_RET ("second preadv returned an unexpected value");

  /* And compare the buffers read and written to check if there are equal.  */

  if (memcmp (buf1, buf3, sizeof buf1) != 0)

    FAIL_RET ("first buffer from second preadv different than expected");

  if (memcmp (buf2, buf4, sizeof buf2) != 0)

    FAIL_RET ("second buffer from second preadv different than expected");

  return 0;

}

#include <support/test-driver.c>