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with-standard-io-syntax (Macro)

Syntax:
— Macro: 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.

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

Figure 23.1: Values of standard control variables

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))))