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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.
38 lines
1 KiB
Scheme
38 lines
1 KiB
Scheme
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(define-syntax define-values
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(syntax-rules ()
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((define-values () expr)
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(define dummy
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(call-with-values (lambda () expr)
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(lambda args #f))))
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((define-values (var) expr)
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(define var expr))
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((define-values (var0 var1 ... varn) expr)
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(begin
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(define var0
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(call-with-values (lambda () expr) list))
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(define var1
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(let ((v (cadr var0)))
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(set-cdr! var0 (cddr var0))
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v))
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...
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(define varn
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(let ((v (cadr var0)))
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(set! var0 (car var0))
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v))))
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((define-values (var0 var1 ... . var-dot) expr)
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(begin
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(define var0
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(call-with-values (lambda () expr) list))
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(define var1
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(let ((v (cadr var0)))
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(set-cdr! var0 (cddr var0))
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v))
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...
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(define var-dot
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(let ((v (cdr var0)))
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(set! var0 (car var0))
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v))))
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((define-values var expr)
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(define var
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(call-with-values (lambda () expr) list)))))
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