+(defun concat-separated-strings (separator &rest lists)
+ (format nil (format nil "~~{~~A~~^~A~~}" separator) (append-sublists lists)))
+
+(defun only-null-list-elements-p (lst)
+ (or (null lst) (every #'null lst)))
+
+(defun print-separated-strings (strm separator &rest lists)
+ (declare (optimize (speed 3) (safety 0) (space 0) (debug 0)
+ (compilation-speed 0)))
+ (do* ((rest-lists lists (cdr rest-lists))
+ (list (car rest-lists) (car rest-lists))
+ (last-list (only-null-list-elements-p (cdr rest-lists))
+ (only-null-list-elements-p (cdr rest-lists))))
+ ((null rest-lists) strm)
+ (do* ((lst list (cdr lst))
+ (elem (car lst) (car lst))
+ (last-elem (null (cdr lst)) (null (cdr lst))))
+ ((null lst))
+ (write-string elem strm)
+ (unless (and last-elem last-list)
+ (write-string separator strm)))))
+
+(defun prefixed-fixnum-string (num pchar len)
+ "Outputs a string of LEN chars with the initial character being
+PCHAR. Leading zeros are printed."
+ (declare (optimize (speed 3) (safety 0) (space 0))
+ (type fixnum v len))
+ (let ((zero-code (char-code #\0))
+ (result (make-string len :initial-element #\0))
+ (pos (1- len)))
+ (declare (fixnum zero-code pos)
+ (simple-string result))
+ (do* ((val num (floor (/ val 10)))
+ (mod (nth-value 1 (floor val 10))
+ (nth-value 1 (floor val 10))))
+ ((or (zerop val) (minusp pos)))
+ (declare (fixnum val mod))
+ (setf (schar result pos) (code-char (+ zero-code mod)))
+ (decf pos))
+ (when pchar
+ (setf (schar result 0) pchar))
+ result))