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  ANSI Common Lisp   23 Reader   23.2 Dictionary of Reader

23.2.12 with-standard-io-syntax Macro

with-standard-io-syntax {form}*    {result}*

Arguments and Values:
forms - an implicit progn.

results - the values returned by the forms.

Within the dynamic extent of the body of forms, all reader/printer control variables, including any implementation-defined ones not specified by this standard, are bound to values that produce standard read/print behavior. The values for the variables specified by this standard are listed in the next figure.

Values of standard control variables
Variable Value
*package* The cl-user package
*print-array* t
*print-base* 10
*print-case* :upcase
*print-circle* nil
*print-escape* t
*print-gensym* t
*print-length* nil
*print-level* nil
*print-lines* nil
*print-miser-width* nil
*print-pprint-dispatch* The standard pprint dispatch table
*print-pretty* nil
*print-radix* nil
*print-readably* t
*print-right-margin* nil
*read-base* 10
*read-default-float-format* single-float
*read-eval* t
*read-suppress* nil
*readtable* The standard readtable

 (with-open-file (file pathname :direction :output)
     (print data file)))

;;; ... Later, in another Lisp:

 (with-open-file (file pathname :direction :input)
     (setq data (read file))))

Allegro CL Implementation Details:
See The standard readtable is read-only, affect on with-standard-io-syntax and modifying the readtable in init files and with -e in implementation.htm for a note on the binding of *readtable* in a with-standard-io-syntax call. Note the links are to the documentation for the current Allegro CL version. Replace /current/ in the URL with the Allegro CL version number to see similar documentation in earlier releases.

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