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!------------------------------------------------------------------------ |
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! Files Module |
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!----------------------------------------------------------------------- |
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! Functions: |
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! |
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! NEXT_UNIT Returns the next available fortran unit number. |
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! |
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! Uses the fortran 90 inquire statement to find next unit. |
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! |
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!----------------------------------------------------------------------- |
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module file_units |
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|
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use definitions, ONLY : max_units |
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use io_units, ONLY : INPUT_UNIT,OUTPUT_UNIT |
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|
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|
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contains |
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|
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function next_unit() result(unit_number) |
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|
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! result variable |
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integer :: unit_number |
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|
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! local scalar variables |
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integer :: i, unit |
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logical :: is_opened |
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|
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!. initialize unit number to return -1 |
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! we can use this to error check |
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unit = -1 |
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|
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is_opened = .true. |
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|
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! do while unit is opened |
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|
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find_unit: do i = 10, max_units |
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|
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! check to make sure that we don't assign input or |
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! output streams |
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|
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if ( ( i /= input_unit) .and. (i /= output_unit) ) then |
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|
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inquire (i, opened = is_opened) |
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|
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if ( .not. is_opened ) then |
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unit = i |
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exit find_unit |
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end if |
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end if |
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end do find_unit |
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|
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unit_number = unit |
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|
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end function next_unit |
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|
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end module file_units |
