#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <unistd.h>

#include "ikarus-data.h"

ikp 
ikrt_io_error(){
  switch(errno){
    case EBADF           : return fix(-2);
    case EINTR           : return fix(-3);
    case ENOTDIR         : return fix(-4);
    case ENAMETOOLONG    : return fix(-5);
    case ENOENT          : return fix(-6);
    case EACCES          : return fix(-7);
    case ELOOP           : return fix(-8);
    case EISDIR          : return fix(-9);
    case EROFS           : return fix(-10);
    case EMFILE          : return fix(-11);
    case ENFILE          : return fix(-12);
    case ENXIO           : return fix(-13);
    case EOPNOTSUPP      : return fix(-14);
    case ENOSPC          : return fix(-15);
    case EDQUOT          : return fix(-16);
    case EIO             : return fix(-17);
    case ETXTBSY         : return fix(-18);
    case EFAULT          : return fix(-19);
    case EEXIST          : return fix(-20);
    case EINVAL          : return fix(-21);
  }
  return fix(-1);
}


ikp
ikrt_close_fd(ikp fd, ikpcb* pcb){
  int err = close(unfix(fd));
  if(err == -1){
    return ikrt_io_error();
  } else {
    return false_object;;
  }
}

ikp
ikrt_open_input_fd(ikp fn, ikpcb* pcb){
  int fh = open((char*)(fn+off_bytevector_data, O_RDONLY), 0);
  if(fh > 0){
    return fix(fh);
  } else {
    return ikrt_io_error();
  }
}

ikp
ikrt_read_fd(ikp fd, ikp bv, ikp off, ikp cnt, ikpcb* pcb){
  ssize_t bytes = 
   read(unfix(fd),
        (char*)(bv+off_bytevector_data+unfix(off)), 
        unfix(cnt));
  if(bytes >= 0){
    return fix(bytes);
  } else {
    return ikrt_io_error();
  }
}