sunet/ecm-utilities.scm

;; ecm-utilities.scm -- Utility procedures for ecm-net code
;;
;; $Id: ecm-utilities.scm,v 1.2 2001/11/15 11:12:23 mainzelm Exp $
;;
;; Please send suggestions and bug reports to <emarsden@mail.dotcom.fr>


;; please tell me if this doesn't work on your system.
(define (system-fqdn)
  (let ((sysname (system-name)))
    (if (string-index sysname #\.)
        sysname
        (nslookup-fqdn))))

(define (nslookup-fqdn)
  (let* ((cmd (format #f "nslookup ~a" (system-name)))
         (raw (string-join (run/strings (nslookup ,(system-name)))))
         (match (string-match "Name: +([-a-zA-Z0-9.]+)" raw)))
    (display raw)
    (match:substring match 1)))


;; prefer this to :optional
(define (safe-first x) (and (not (null? x)) (car x)))
(define (safe-second x) (and (not (null? (cdr x))) (cadr x)))

(define (write-crlf port)
  (write-string "\r\n" port)
  (force-output port))


(define (dump fd)
  (let loop ((c (read-char fd)))
    (cond ((not (eof-object? c))
           (write-char c)
           (loop (read-char fd))))))

  
(define-syntax when
  (syntax-rules ()
    ((when bool body1 body2 ...)
     (if bool (begin body1 body2 ...)))))


(define-syntax unless
  (syntax-rules ()
    ((unless bool body1 body2 ...)
     (if (not bool) (begin body1 body2 ...)))))

;; EOF