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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.

Reviewer: Barrett: *print-pprint-dispatch* should probably be mentioned here, too.!!! We've opened issue WITH-STANDARD-IO-SYNTAX-INCOMPLETE to clarify this. -kmp 1-Sep-91 I added *print-lines*, *print-miser-width*, *print-pprint-dispatch*, and *print-right-margin* to this table. --sjl 16 Mar 1992

VariableValue
*package*The cl-userpackage
*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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Rendered from the TeX sources of the draft ANSI Common Lisp standard (X3J13/92-102)