CLHS: Macro WITH-STANDARD-IO-SYNTAX

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Macro WITH-STANDARD-IO-SYNTAX

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.

    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))))

Affected By: None.

Exceptional Situations: None.

See Also: None.

Notes: None.

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