+ (cond ((not (whitespace[1]p char))
+ (unread-char char stream)
+ (return t)))))
+\f
+;;;; helpers for C library calls
+
+;;; Signal a SIMPLE-CONDITION/ERROR condition associated with an ANSI C
+;;; errno problem, arranging for the condition's print representation
+;;; to be similar to the ANSI C perror(3) style.
+(defun simple-perror (prefix-string
+ &key
+ (errno (get-errno))
+ (simple-error 'simple-error)
+ other-condition-args)
+ (declare (type symbol simple-error))
+ (aver (subtypep simple-error 'simple-condition))
+ (aver (subtypep simple-error 'error))
+ (apply #'error
+ simple-error
+ :format-control "~@<~A: ~2I~_~A~:>"
+ :format-arguments (list prefix-string (strerror errno))
+ other-condition-args))
+
+;;; Constructing shortish strings one character at a time. More efficient then
+;;; a string-stream, as can directly use simple-base-strings when applicable,
+;;; and if the maximum size is know doesn't need to copy the result at all --
+;;; but if the result is going to be HUGE, string-streams will win.
+(defmacro with-push-char ((&key (element-type 'character) (initial-size 28)) &body body)
+ (with-unique-names (string size pointer)
+ `(let* ((,size ,initial-size)
+ (,string (make-array ,size :element-type ',element-type))
+ (,pointer 0))
+ (declare (type (integer 0 ,sb!xc:array-dimension-limit) ,size)
+ (type (integer 0 ,(1- sb!xc:array-dimension-limit)) ,pointer)
+ (type (simple-array ,element-type (*)) ,string))
+ (flet ((push-char (char)
+ (declare (optimize (sb!c::insert-array-bounds-checks 0)))
+ (when (= ,pointer ,size)
+ (let ((old ,string))
+ (setf ,size (* 2 (+ ,size 2))
+ ,string (make-array ,size :element-type ',element-type))
+ (replace ,string old)))
+ (setf (char ,string ,pointer) char)
+ (incf ,pointer))
+ (get-pushed-string ()
+ (let ((string ,string)
+ (size ,pointer))
+ (setf ,size 0
+ ,pointer 0
+ ,string ,(coerce "" `(simple-array ,element-type (*))))
+ ;; This is really local, so we can be destructive!
+ (%shrink-vector string size)
+ string)))
+ ,@body))))
+
+;;; The smallest power of two that is equal to or greater than X.
+(defun power-of-two-ceiling (x)
+ (declare (index x))
+ (ash 1 (integer-length (1- x))))