Sheltran - I/O statements

Form:

      ...,ERR=<exit specifier>,... 
      and/or 
      ...,END=<exit specifier>,...

Notes:

The following I/O statements are recognized: READ, WRITE, OPEN, CLOSE, REWIND, BACKSPACE, INQUIRE, ENDFILE.
<exit specifier> can be any one of the following: XWHILE, XREPEAT, XFOR, STOP, RETURN or <procedure name>.
The exit specification must appear on the first line of the I/O statement.

Actions:

The use of <procedure name> is equivalent to a PERFORM of the procedure between the I/O statement and the statement following it. The use of the other items will have the normal SHELTRAN meaning.

Example:

      WHILE .TRUE.
         READ(1,FMT='(A)',END=XWHILE,ERR=ERRPRC) LINE
         WRITE(2,FMT='(1X,A)',ERR=ERRPRC) LINE 
      CWHILE
         .
         .
         .
      PROC ERRPRC 
         REWIND 1
         REWIND 2
      CPROC