A FileRd.T, or file reader, is a reader on a File.T. \index{buffered file I/O} \index{file!buffered I/O}

INTERFACE FileRd;

IMPORT Rd, File, OSError, Pathname;

TYPE
  T <: Public;
  Public = Rd.T OBJECT METHODS
    init(h: File.T): T RAISES {OSError.E}
  END;

If r is a file reader and h is a file handle, the call r.init(h) initializes r so that reading r reads characters from h, and so that closing r closes h.

For any other file handle h, r.init(h) causes r to be an intermittent, nonseekable reader and initializes cur(r) to zero.

If a subsequent reader operation on r raises Rd.Failure, the associated exception argument is the AtomList.T argument accompanying an OSError.E exception from a file operation on h.

PROCEDURE Open(p: Pathname.T): T RAISES {OSError.E};

Return a file reader whose source is the file named p. If the file does not exist, OSError.E is raised with an implementation-defined code.

      RETURN NEW(T).init(FS.OpenFileReadonly(p))

END FileRd.