with-input-from-file -- r7rs Definition

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Kind

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procedure;

Implemented by

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• with-input-from-file (from vonuvoli);

Procedure signature

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Procedure variants:

• ((path-string procedure-0) -> (any))
  • inputs:
    • a value of type path-string;
    • a value of type procedure-0;
  • output: a value of type any;

Exports

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• scheme:file -- (scheme file);

Exports recursive

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• scheme -- (scheme);

Description

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(with-input-from-file string thunk)
(with-output-to-file string thunk)

The file is opened for input or output as if by open-input-file or open-output-file, and the new port is made to be the value returned by current-input-port or current-output-port (as used by (read), (write obj), and so forth). The thunk is then called with no arguments. When the thunk returns, the port is closed and the previous default is restored. It is an error if thunk does not accept zero arguments. Both procedures return the values yielded by thunk. If an escape procedure is used to escape from the continuation of these procedures, they behave exactly as if the current input or output port had been bound dynamically with parameterize.

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The text herein was sourced and adapted as described in the "R7RS attribution of various text snippets" appendix.

Referenced-types

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• path-string;
• procedure-0;
• any;