/*-
 * Copyright (c) 2002-2018 The UbixOS Project.
 * All rights reserved.
 *
 * This was developed by Christopher W. Olsen for the UbixOS Project.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * 1) Redistributions of source code must retain the above copyright notice, this list of
 *    conditions, the following disclaimer and the list of authors.
 * 2) Redistributions in binary form must reproduce the above copyright notice, this list of
 *    conditions, the following disclaimer and the list of authors in the documentation and/or
 *    other materials provided with the distribution.
 * 3) Neither the name of the UbixOS Project nor the names of its contributors may be used to
 *    endorse or promote products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/kern_descrip.h>
#include <sys/sysproto.h>
#include <sys/thread.h>
#include <lib/kprintf.h>
#include <ubixos/endtask.h>
#include <lib/kmalloc.h>
#include <assert.h>

int fcntl(struct thread *td, struct fcntl_args *uap) {
  struct file *fp = 0x0;

#ifdef DEBUG
  kprintf("[%s:%i]",__FILE__,__LINE__);
#endif

  if (td->o_files[uap->fd] == 0x0) {
    kprintf("ERROR!!!\n");
    return (-1);
  }

  fp = (struct file *) td->o_files[uap->fd];
  switch (uap->cmd) {
    case 3:
      td->td_retval[0] = fp->f_flag;
    break;
    case 4:
      fp->f_flag &= ~FCNTLFLAGS;
      fp->f_flag |= FFLAGS(uap->arg & ~O_ACCMODE) & FCNTLFLAGS;
    break;
    default:
      kprintf("ERROR DEFAULT");
  }

  return (0x0);
}

int falloc(struct thread *td, struct file **resultfp, int *resultfd) {
  struct file *fp = 0x0;
  int i = 0;

#ifdef DEBUG
  kprintf("[%s:%i]",__FILE__,__LINE__);
#endif

  fp = (struct file *) kmalloc(sizeof(struct file));
  /* First 5 Descriptors Are Reserved */
  for (i = 5; i < 1024; i++) {
    if (td->o_files[i] == 0x0) {
      td->o_files[i] = (void *) fp;
      if (resultfd)
        *resultfd = i;
      if (resultfp)
        *resultfp = fp;
      break;
    }
  }
  return (0x0);
}

int close(struct thread *td, struct close_args *uap) {
#ifdef DEBUG
  kprintf("[%s:%i]",__FILE__,__LINE__);
#endif
  kfree((void *) td->o_files[uap->fd]);
  td->o_files[uap->fd] = 0x0;
  td->td_retval[0] = 0x0;
  return (0x0);
}

/*!
 * \brief return data table size
 */
int getdtablesize(struct thread *td, struct getdtablesize_args *uap) {
#ifdef DEBUG
  kprintf("[%s:%i]",__FILE__,__LINE__);
#endif
  td->td_retval[0] = O_FILES;
  return (0);
}

/* HACK */
int fstat(struct thread *td, struct fstat_args *uap) {
  struct file *fp = 0x0;

#ifdef DEBUG
  kprintf("[%s:%i]",__FILE__,__LINE__);
#endif

  fp = (struct file *) _current->td.o_files[uap->fd];
  uap->sb->st_mode = 0x2180;
  uap->sb->st_blksize = 0x1000;
  kprintf("fstat: %i", uap->fd);
  return (0x0);
}

/*!
 * \brief ioctl functionality not implimented yet
 *
 * \returns NULL for now
 */
int ioctl(struct thread *td, struct ioctl_args *uap) {
  td->td_retval[0] = 0x0;
  return (0x0);
}

/*!
 * \brief get pointer to file fd in specified thread
 *
 * \return returns fp
 */
int getfd(struct thread *td, struct file **fp, int fd) {
  int error = 0x0;

#ifdef DEBUG
  kprintf("[%s:%i]",__FILE__,__LINE__);
#endif

  *fp = (struct file *) td->o_files[fd];

  if (fp == 0x0)
    error = -1;

  return (error);
}

/***
 END
 ***/