| with-standard-io-syntax | Macro |
with-standard-io-syntax {form}* → {result}*
forms — an implicit progn.
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 Figure 23–1.
| 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)
(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))))