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https://github.com/ashinn/chibi-scheme.git
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8b5eb68238
They can be close()d explicitly with close-file-descriptor, and will close() on gc, but only explicitly closing the last port on them will close the fileno. Notably needed for network sockets where we open separate input and output ports on the same socket.
23 lines
867 B
Scheme
23 lines
867 B
Scheme
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(define-library (srfi 16)
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(export case-lambda)
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(import (chibi))
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(begin
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(define-syntax %case
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(syntax-rules ()
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((%case args len n p ((params ...) . body) . rest)
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(if (= len (length '(params ...)))
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(apply (lambda (params ...) . body) args)
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(%case args len 0 () . rest)))
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((%case args len n (p ...) ((x . y) . body) . rest)
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(%case args len (+ n 1) (p ... x) (y . body) . rest))
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((%case args len n (p ...) (y . body) . rest)
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(if (>= len n)
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(apply (lambda (p ... . y) . body) args)
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(%case args len 0 () . rest)))
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((%case args len n p)
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(error "case-lambda: no cases matched"))))
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(define-syntax case-lambda
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(syntax-rules ()
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((case-lambda . clauses)
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(lambda args (let ((len (length* args))) (%case args len 0 () . clauses))))))))
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