ikarus/lab/greeting-server.ss

43 lines
1.3 KiB
Scheme
Executable File

#!/usr/bin/env ikarus --r6rs-script
(import (ikarus))
(define (get-name p)
(list->string
(let f ()
(let ([x (read-char p)])
(cond
[(or (eof-object? x) (char-whitespace? x))
'()]
[else (cons x (f))])))))
(define serve
(case-lambda
[(who port)
(let ([s (tcp-server-socket
(or (string->number port)
(error who "invalid port number" port)))])
(call/cc
(lambda (k)
(with-exception-handler k
(lambda ()
(let f ()
(let-values ([(op ip) (accept-connection s)])
(let ([op (transcoded-port op (native-transcoder))]
[ip (transcoded-port ip (native-transcoder))])
(display "What's your name? " op)
(let ([name (get-name ip)])
(printf "Connection from ~s\n" name)
(fprintf op "Got it, ~a\n" name)
(close-input-port ip)
(close-output-port op))))
(f))))))
(printf "\nClosing server ...\n")
(close-tcp-server-socket s))]
[(who)
(error who "missing port number")]
[(who . args)
(error who "too many arguments")]))
(apply serve (command-line))