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| ANSI Common Lisp 23 Reader 23.2 Dictionary of Reader
23.2.12 with-standard-io-syntax | Macro
  Syntax: with-standard-io-syntax {form}* {result}* Arguments and Values: forms - an implicit progn. results - the values returned by the forms. Description: 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
  Examples:
       (with-open-file (file pathname :direction :output)
         (with-standard-io-syntax
           (print data file)))

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

       (with-open-file (file pathname :direction :input)
         (with-standard-io-syntax
           (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 is earlier releases.

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