+(defun string-replace-chars-strings (str repl-alist)
+ "Replace all instances of a chars with a string. repl-alist is an assoc
+list of characters and replacement strings."
+ (declare (string str))
+ (let* ((orig-len (length str))
+ (new-len orig-len))
+ (declare (fixnum orig-len new-len))
+ (dotimes (i orig-len)
+ (declare (fixnum i))
+ (let* ((c (char str i))
+ (match (assoc c repl-alist :test #'char=)))
+ (declare (character c))
+ (when match
+ (incf new-len (length (cdr match))))))
+ (let ((new-string (make-string new-len))
+ (i 0))
+ (declare (string new-string)
+ (fixnum i))
+ (dotimes (i orig-len)
+ (declare (fixnum i))
+ (let* ((c (char str i))
+ (match (assoc c repl-alist :test #'char=)))
+ (declare (character c))
+ (if match
+ (let ((subst (cdr match)))
+ (dotimes (j (length subst))
+ (setf (char new-string i) (char subst j))
+ (incf i)))
+ (progn
+ (setf (char new-string i) c)))))
+ new-string)))
+
+(defun escape-xml-string (string)
+ "Escape invalid XML characters"
+ (string-replace-char-string
+ (string-replace-char-string string #\& "&")
+ #\< "<"))
+
+(defun string-replace-char-string (string repl-char repl-str)
+ "Replace all occurances of repl-char with repl-str"
+ (declare (simple-string string))
+ (let ((count (count repl-char string)))
+ (declare (fixnum count))
+ (if (zerop count)
+ string
+ (locally (declare (optimize (speed 3) (safety 0)))
+ (let* ((old-length (length string))
+ (repl-length (length repl-str))
+ (new-string (make-string (the fixnum
+ (+ old-length
+ (the fixnum
+ (* count
+ (the fixnum (1- repl-length)))))))))
+ (declare (fixnum old-length repl-length)
+ (simple-string new-string))
+ (let ((newpos 0))
+ (declare (fixnum newpos))
+ (dotimes (oldpos (length string))
+ (declare (fixnum oldpos))
+ (if (char= repl-char (schar string oldpos))
+ (dotimes (repl-pos repl-length)
+ (declare (fixnum repl-pos))
+ (setf (schar new-string newpos) (schar repl-str repl-pos))
+ (incf newpos))
+ (progn
+ (setf (schar new-string newpos) (schar string oldpos))
+ (incf newpos)))))
+ new-string)))))
+
+
+
+(defun make-usb8-array (len)
+ (make-array len :adjustable nil
+ :fill-pointer nil
+ :element-type '(unsigned-byte 8)))
+
+(defun usb8-array-to-string (vec)
+ (let* ((len (length vec))
+ (str (make-string len)))
+ (declare (fixnum len)
+ (simple-string str)
+ (optimize (speed 3)))
+ (dotimes (i len)
+ (declare (fixnum i))
+ (setf (schar str i) (code-char (aref vec i))))
+ str))
+
+(defun string-to-usb8-array (str)
+ (let* ((len (length str))
+ (vec (make-usb8-array len)))
+ (declare (fixnum len)
+ (type (array fixnum (*)) vec)
+ (optimize (speed 3)))
+ (dotimes (i len)
+ (declare (fixnum i))
+ (setf (aref vec i) (char-code (schar str i))))
+ vec))
+