| !> |
| !! Sample program demonstrates stream I/O in Fortran 2003. |
| !! |
| !! Jeff Overbey (2/22/09) |
| !< |
| program stream_io |
| implicit none |
| |
| integer, parameter :: FILE = 2 |
| |
| call check_byte_kind |
| call create_file |
| call read_file |
| stop |
| |
| contains |
| subroutine check_byte_kind |
| integer(kind=1) :: byte = 127 + 1 |
| integer :: int = 127 + 1 |
| if (byte .ne. -128 .or. int .ne. 128) & |
| stop "integer(kind=1) is not one byte" |
| end subroutine |
| |
| subroutine create_file |
| integer(kind=1) byte |
| |
| open (FILE, status='replace', action='write', access='stream', form='unformatted', file='bytes') |
| write (FILE) transfer("A", byte) |
| write (FILE) transfer("B", byte) |
| write (FILE) new_line("x") |
| write (FILE) transfer("C", byte) |
| close (FILE) |
| end subroutine |
| |
| subroutine read_file |
| integer(kind=1) byte |
| integer pos, status |
| character*256 :: errmsg |
| |
| open (FILE, status='old', action='read', access='stream', form='unformatted', file='bytes') |
| do |
| inquire (FILE, pos=pos) |
| print *, "Position is", pos |
| |
| !read (FILE, pos=pos, iostat=status, iomsg=errmsg) byte |
| read (FILE, iostat=status, iomsg=errmsg) byte |
| if (status .eq. 0) then |
| print '("Read byte ", i5, ", status is ", i5)', byte, status |
| else if (is_iostat_end(status)) then |
| exit |
| else |
| print *, errmsg |
| stop "I/O error" |
| end if |
| end do |
| print '("Read ", i5, " bytes")', pos-1 |
| close (FILE) |
| end subroutine |
| end program |
