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;;; -*- Mode: Lisp; Package: Xlib; Log: clx.log -*-

;; This file contains some of the system dependent code for CLX

;;;
;;;			 TEXAS INSTRUMENTS INCORPORATED
;;;				  P.O. BOX 2909
;;;			       AUSTIN, TEXAS 78769
;;;
;;; Copyright (C) 1987 Texas Instruments Incorporated.
;;;
;;; Permission is granted to any individual or institution to use, copy, modify,
;;; and distribute this software, provided that this complete copyright and
;;; permission notice is maintained, intact, in all copies and supporting
;;; documentation.
;;;
;;; Texas Instruments Incorporated provides this software "as is" without
;;; express or implied warranty.
;;;

(in-package :xlib)

(proclaim '(declaration array-register))

#+cmu
(setf (getf ext:*herald-items* :xlib)
      `("    CLX X Library " ,*version*))


;;; The size of the output buffer.  Must be a multiple of 4.
(defparameter *output-buffer-size* 8192)

#+explorer
(zwei:define-indentation event-case (1 1))

;;; Number of seconds to wait for a reply to a server request
(defparameter *reply-timeout* nil) 

#-(or clx-overlapping-arrays (not clx-little-endian))
(progn
  (defconstant *word-0* 0)
  (defconstant *word-1* 1)

  (defconstant *long-0* 0)
  (defconstant *long-1* 1)
  (defconstant *long-2* 2)
  (defconstant *long-3* 3))

#-(or clx-overlapping-arrays clx-little-endian)
(progn
  (defconstant *word-0* 1)
  (defconstant *word-1* 0)

  (defconstant *long-0* 3)
  (defconstant *long-1* 2)
  (defconstant *long-2* 1)
  (defconstant *long-3* 0))

;;; Set some compiler-options for often used code

(eval-when (eval compile load)

(defconstant *buffer-speed* #+clx-debugging 1 #-clx-debugging 3
  "Speed compiler option for buffer code.")
(defconstant *buffer-safety* #+clx-debugging 3 #-clx-debugging 0
  "Safety compiler option for buffer code.")

(defun declare-bufmac ()
  `(declare (optimize (speed ,*buffer-speed*) (safety ,*buffer-safety*))))

;;; It's my impression that in lucid there's some way to make a declaration
;;; called fast-entry or something that causes a function to not do some
;;; checking on args. Sadly, we have no lucid manuals here.  If such a
;;; declaration is available, it would be a good idea to make it here when
;;; *buffer-speed* is 3 and *buffer-safety* is 0.
(defun declare-buffun ()
  #+(and cmu clx-debugging)
  '(declare (optimize (speed 1) (safety 1)))
  #-(and cmu clx-debugging)
  `(declare (optimize (speed ,*buffer-speed*) (safety ,*buffer-safety*))))

)

(declaim (inline card8->int8 int8->card8
		 card16->int16 int16->card16
		 card32->int32 int32->card32))

#-Genera
(progn

(defun card8->int8 (x)
  (declare (type card8 x))
  (declare (clx-values int8))
  #.(declare-buffun)
  (the int8 (if (logbitp 7 x)
		(the int8 (- x #x100))
	      x)))

(defun int8->card8 (x)
  (declare (type int8 x))
  (declare (clx-values card8))
  #.(declare-buffun)
  (the card8 (ldb (byte 8 0) x)))

(defun card16->int16 (x)
  (declare (type card16 x))
  (declare (clx-values int16))
  #.(declare-buffun)
  (the int16 (if (logbitp 15 x)
		 (the int16 (- x #x10000))
		 x)))

(defun int16->card16 (x)
  (declare (type int16 x))
  (declare (clx-values card16))
  #.(declare-buffun)
  (the card16 (ldb (byte 16 0) x)))

(defun card32->int32 (x)
  (declare (type card32 x))
  (declare (clx-values int32))
  #.(declare-buffun)
  (the int32 (if (logbitp 31 x)
		 (the int32 (- x #x100000000))
		 x)))

(defun int32->card32 (x)
  (declare (type int32 x))
  (declare (clx-values card32))
  #.(declare-buffun)
  (the card32 (ldb (byte 32 0) x)))

)

#+Genera
(progn

(defun card8->int8 (x)
  (declare lt:(side-effects simple reducible))
  (if (logbitp 7 x) (- x #x100) x))

(defun int8->card8 (x)
  (declare lt:(side-effects simple reducible))
  (ldb (byte 8 0) x))

(defun card16->int16 (x)
  (declare lt:(side-effects simple reducible))
  (if (logbitp 15 x) (- x #x10000) x))

(defun int16->card16 (x)
  (declare lt:(side-effects simple reducible))
  (ldb (byte 16 0) x))

(defun card32->int32 (x)
  (declare lt:(side-effects simple reducible))
  (sys:%logldb (byte 32 0) x))

(defun int32->card32 (x)
  (declare lt:(side-effects simple reducible))
  (ldb (byte 32 0) x))

)

(declaim (inline aref-card8 aset-card8 aref-int8 aset-int8))

#-(or Genera lcl3.0 excl)
(progn

(defun aref-card8 (a i)
  (declare (type buffer-bytes a)
	   (type array-index i))
  (declare (clx-values card8))
  #.(declare-buffun)
  (the card8 (aref a i)))

(defun aset-card8 (v a i)
  (declare (type card8 v)
	   (type buffer-bytes a)
	   (type array-index i))
  #.(declare-buffun)
  (setf (aref a i) v))

(defun aref-int8 (a i)
  (declare (type buffer-bytes a)
	   (type array-index i))
  (declare (clx-values int8))
  #.(declare-buffun)
  (card8->int8 (aref a i)))

(defun aset-int8 (v a i)
  (declare (type int8 v)
	   (type buffer-bytes a)
	   (type array-index i))
  #.(declare-buffun)
  (setf (aref a i) (int8->card8 v)))

)

#+Genera
(progn

(defun aref-card8 (a i)
  (aref a i))

(defun aset-card8 (v a i)
  (zl:aset v a i))

(defun aref-int8 (a i)
  (card8->int8 (aref a i)))

(defun aset-int8 (v a i)
  (zl:aset (int8->card8 v) a i))

)

#+(or excl lcl3.0 clx-overlapping-arrays)
(declaim (inline aref-card16 aref-int16 aref-card32 aref-int32 aref-card29
		 aset-card16 aset-int16 aset-card32 aset-int32 aset-card29))

#+(and clx-overlapping-arrays Genera)
(progn

(defun aref-card16 (a i)
  (aref a i))

(defun aset-card16 (v a i)
  (zl:aset v a i))

(defun aref-int16 (a i)
  (card16->int16 (aref a i)))

(defun aset-int16 (v a i)
  (zl:aset (int16->card16 v) a i)
  v)

(defun aref-card32 (a i)
  (int32->card32 (aref a i)))

(defun aset-card32 (v a i)
  (zl:aset (card32->int32 v) a i))

(defun aref-int32 (a i) (aref a i))

(defun aset-int32 (v a i)
  (zl:aset v a i))

(defun aref-card29 (a i)
  (aref a i))

(defun aset-card29 (v a i)
  (zl:aset v a i))

)

#+(and clx-overlapping-arrays (not Genera))
(progn

(defun aref-card16 (a i)
  (aref a i))

(defun aset-card16 (v a i)
  (setf (aref a i) v))

(defun aref-int16 (a i)
  (card16->int16 (aref a i)))

(defun aset-int16 (v a i)
  (setf (aref a i) (int16->card16 v))
  v)

(defun aref-card32 (a i)
  (aref a i))

(defun aset-card32 (v a i)
  (setf (aref a i) v))

(defun aref-int32 (a i)
  (card32->int32 (aref a i)))

(defun aset-int32 (v a i)
  (setf (aref a i) (int32->card32 v))
  v)

(defun aref-card29 (a i)
  (aref a i))

(defun aset-card29 (v a i)
  (setf (aref a i) v))

)

#+excl
(progn
  
(defun aref-card8 (a i)
  (declare (type buffer-bytes a)
	   (type array-index i))
  (declare (clx-values card8))
  #.(declare-buffun)
  (the card8 (sys:memref a #.(comp::mdparam 'comp::md-svector-data0-adj) i
			 :unsigned-byte)))

(defun aset-card8 (v a i)
  (declare (type card8 v)
	   (type buffer-bytes a)
	   (type array-index i))
  #.(declare-buffun)
  (setf (sys:memref a #.(comp::mdparam 'comp::md-svector-data0-adj) i
		    :unsigned-byte) v))

(defun aref-int8 (a i)
  (declare (type buffer-bytes a)
	   (type array-index i))
  (declare (clx-values int8))
  #.(declare-buffun)
  (the int8 (sys:memref a #.(comp::mdparam 'comp::md-svector-data0-adj) i
			:signed-byte)))

(defun aset-int8 (v a i)
  (declare (type int8 v)
	   (type buffer-bytes a)
	   (type array-index i))
  #.(declare-buffun)
  (setf (sys:memref a #.(comp::mdparam 'comp::md-svector-data0-adj) i
		    :signed-byte) v))

(defun aref-card16 (a i)
  (declare (type buffer-bytes a)
	   (type array-index i))
  (declare (clx-values card16))
  #.(declare-buffun)
  (the card16 (sys:memref a #.(comp::mdparam 'comp::md-svector-data0-adj) i
			  :unsigned-word)))
  
(defun aset-card16 (v a i)
  (declare (type card16 v)
	   (type buffer-bytes a)
	   (type array-index i))
  #.(declare-buffun)
  (setf (sys:memref a #.(comp::mdparam 'comp::md-svector-data0-adj) i
		    :unsigned-word) v))
  
(defun aref-int16 (a i)
  (declare (type buffer-bytes a)
	   (type array-index i))
  (declare (clx-values int16))
  #.(declare-buffun)
  (the int16 (sys:memref a #.(comp::mdparam 'comp::md-svector-data0-adj) i
			 :signed-word)))
  
(defun aset-int16 (v a i)
  (declare (type int16 v)
	   (type buffer-bytes a)
	   (type array-index i))
  #.(declare-buffun)
  (setf (sys:memref a #.(comp::mdparam 'comp::md-svector-data0-adj) i
		    :signed-word) v))
  
(defun aref-card32 (a i)
  (declare (type buffer-bytes a)
	   (type array-index i))
  (declare (clx-values card32))
  #.(declare-buffun)
  (the card32 (sys:memref a #.(comp::mdparam 'comp::md-svector-data0-adj) i
			  :unsigned-long)))
    
(defun aset-card32 (v a i)
  (declare (type card32 v)
	   (type buffer-bytes a)
	   (type array-index i))
  #.(declare-buffun)
  (setf (sys:memref a #.(comp::mdparam 'comp::md-svector-data0-adj) i
		    :unsigned-long) v))

(defun aref-int32 (a i)
  (declare (type buffer-bytes a)
	   (type array-index i))
  (declare (clx-values int32))
  #.(declare-buffun)
  (the int32 (sys:memref a #.(comp::mdparam 'comp::md-svector-data0-adj) i
			 :signed-long)))
    
(defun aset-int32 (v a i)
  (declare (type int32 v)
	   (type buffer-bytes a)
	   (type array-index i))
  #.(declare-buffun)
  (setf (sys:memref a #.(comp::mdparam 'comp::md-svector-data0-adj) i
		    :signed-long) v))

(defun aref-card29 (a i)
  (declare (type buffer-bytes a)
	   (type array-index i))
  (declare (clx-values card29))
  #.(declare-buffun)
  (the card29 (sys:memref a #.(comp::mdparam 'comp::md-svector-data0-adj) i
			  :unsigned-long)))

(defun aset-card29 (v a i)
  (declare (type card29 v)
	   (type buffer-bytes a)
	   (type array-index i))
  #.(declare-buffun)
  (setf (sys:memref a #.(comp::mdparam 'comp::md-svector-data0-adj) i
		    :unsigned-long) v))
  
)

#+lcl3.0
(progn

(defun aref-card8 (a i)
  (declare (type buffer-bytes a)
	   (type array-index i)
	   (clx-values card8))
  #.(declare-buffun)
  (the card8 (lucid::%svref-8bit a i)))

(defun aset-card8 (v a i)
  (declare (type card8 v)
	   (type buffer-bytes a)
	   (type array-index i))
  #.(declare-buffun)
  (setf (lucid::%svref-8bit a i) v))

(defun aref-int8 (a i)
  (declare (type buffer-bytes a)
	   (type array-index i)
	   (clx-values int8))
  #.(declare-buffun)
  (the int8 (lucid::%svref-signed-8bit a i)))

(defun aset-int8 (v a i)
  (declare (type int8 v)
	   (type buffer-bytes a)
	   (type array-index i))
  #.(declare-buffun)
  (setf (lucid::%svref-signed-8bit a i) v))

(defun aref-card16 (a i)
  (declare (type buffer-bytes a)
	   (type array-index i)
	   (clx-values card16))
  #.(declare-buffun)
  (the card16 (lucid::%svref-16bit a (index-ash i -1))))
  
(defun aset-card16 (v a i)
  (declare (type card16 v)
	   (type buffer-bytes a)
	   (type array-index i))
  #.(declare-buffun)
  (setf (lucid::%svref-16bit a (index-ash i -1)) v))
  
(defun aref-int16 (a i)
  (declare (type buffer-bytes a)
	   (type array-index i)
	   (clx-values int16))
  #.(declare-buffun)
  (the int16 (lucid::%svref-signed-16bit a (index-ash i -1))))
  
(defun aset-int16 (v a i)
  (declare (type int16 v)
	   (type buffer-bytes a)
	   (type array-index i))
  #.(declare-buffun)
  (setf (lucid::%svref-signed-16bit a (index-ash i -1)) v))

(defun aref-card32 (a i)
  (declare (type buffer-bytes a)
	   (type array-index i)
	   (clx-values card32))
  #.(declare-buffun)
  (the card32 (lucid::%svref-32bit a (index-ash i -2))))
    
(defun aset-card32 (v a i)
  (declare (type card32 v)
	   (type buffer-bytes a)
	   (type array-index i))
  #.(declare-buffun)
  (setf (lucid::%svref-32bit a (index-ash i -2)) v))

(defun aref-int32 (a i)
  (declare (type buffer-bytes a)
	   (type array-index i)
	   (clx-values int32))
  #.(declare-buffun)
  (the int32 (lucid::%svref-signed-32bit a (index-ash i -2))))
    
(defun aset-int32 (v a i)
  (declare (type int32 v)
	   (type buffer-bytes a)
	   (type array-index i))
  #.(declare-buffun)
  (setf (lucid::%svref-signed-32bit a (index-ash i -2)) v))

(defun aref-card29 (a i)
  (declare (type buffer-bytes a)
	   (type array-index i)
	   (clx-values card29))
  #.(declare-buffun)
  (the card29 (lucid::%svref-32bit a (index-ash i -2))))

(defun aset-card29 (v a i)
  (declare (type card29 v)
	   (type buffer-bytes a)
	   (type array-index i))
  #.(declare-buffun)
  (setf (lucid::%svref-32bit a (index-ash i -2)) v))

)



#-(or excl lcl3.0 clx-overlapping-arrays)
(progn

(defun aref-card16 (a i)
  (declare (type buffer-bytes a)
	   (type array-index i))
  (declare (clx-values card16))
  #.(declare-buffun)
  (the card16
       (logior (the card16
		    (ash (the card8 (aref a (index+ i *word-1*))) 8))
	       (the card8
		    (aref a (index+ i *word-0*))))))

(defun aset-card16 (v a i)
  (declare (type card16 v)
	   (type buffer-bytes a)
	   (type array-index i))
  #.(declare-buffun)
  (setf (aref a (index+ i *word-1*)) (the card8 (ldb (byte 8 8) v))
	(aref a (index+ i *word-0*)) (the card8 (ldb (byte 8 0) v)))
  v)

(defun aref-int16 (a i)
  (declare (type buffer-bytes a)
	   (type array-index i))
  (declare (clx-values int16))
  #.(declare-buffun)
  (the int16
       (logior (the int16
		    (ash (the int8 (aref-int8 a (index+ i *word-1*))) 8))
	       (the card8
		    (aref a (index+ i *word-0*))))))

(defun aset-int16 (v a i)
  (declare (type int16 v)
	   (type buffer-bytes a)
	   (type array-index i))
  #.(declare-buffun)
  (setf (aref a (index+ i *word-1*)) (the card8 (ldb (byte 8 8) v))
	(aref a (index+ i *word-0*)) (the card8 (ldb (byte 8 0) v)))
  v)

(defun aref-card32 (a i)
  (declare (type buffer-bytes a)
	   (type array-index i))
  (declare (clx-values card32))
  #.(declare-buffun)
  (the card32
       (logior (the card32
		    (ash (the card8 (aref a (index+ i *long-3*))) 24))
	       (the card29
		    (ash (the card8 (aref a (index+ i *long-2*))) 16))
	       (the card16
		    (ash (the card8 (aref a (index+ i *long-1*))) 8))
	       (the card8
		    (aref a (index+ i *long-0*))))))

(defun aset-card32 (v a i)
  (declare (type card32 v)
	   (type buffer-bytes a)
	   (type array-index i))
  #.(declare-buffun)
  (setf (aref a (index+ i *long-3*)) (the card8 (ldb (byte 8 24) v))
	(aref a (index+ i *long-2*)) (the card8 (ldb (byte 8 16) v))
	(aref a (index+ i *long-1*)) (the card8 (ldb (byte 8 8) v))
	(aref a (index+ i *long-0*)) (the card8 (ldb (byte 8 0) v)))
  v)

(defun aref-int32 (a i)
  (declare (type buffer-bytes a)
	   (type array-index i))
  (declare (clx-values int32))
  #.(declare-buffun)
  (the int32
       (logior (the int32
		    (ash (the int8 (aref-int8 a (index+ i *long-3*))) 24))
	       (the card29
		    (ash (the card8 (aref a (index+ i *long-2*))) 16))
	       (the card16
		    (ash (the card8 (aref a (index+ i *long-1*))) 8))
	       (the card8
		    (aref a (index+ i *long-0*))))))

(defun aset-int32 (v a i)
  (declare (type int32 v)
	   (type buffer-bytes a)
	   (type array-index i))
  #.(declare-buffun)
  (setf (aref a (index+ i *long-3*)) (the card8 (ldb (byte 8 24) v))
	(aref a (index+ i *long-2*)) (the card8 (ldb (byte 8 16) v))
	(aref a (index+ i *long-1*)) (the card8 (ldb (byte 8 8) v))
	(aref a (index+ i *long-0*)) (the card8 (ldb (byte 8 0) v)))
  v)

(defun aref-card29 (a i)
  (declare (type buffer-bytes a)
	   (type array-index i))
  (declare (clx-values card29))
  #.(declare-buffun)
  (the card29
       (logior (the card29
		    (ash (the card8 (aref a (index+ i *long-3*))) 24))
	       (the card29
		    (ash (the card8 (aref a (index+ i *long-2*))) 16))
	       (the card16
		    (ash (the card8 (aref a (index+ i *long-1*))) 8))
	       (the card8
		    (aref a (index+ i *long-0*))))))

(defun aset-card29 (v a i)
  (declare (type card29 v)
	   (type buffer-bytes a)
	   (type array-index i))
  #.(declare-buffun)
  (setf (aref a (index+ i *long-3*)) (the card8 (ldb (byte 8 24) v))
	(aref a (index+ i *long-2*)) (the card8 (ldb (byte 8 16) v))
	(aref a (index+ i *long-1*)) (the card8 (ldb (byte 8 8) v))
	(aref a (index+ i *long-0*)) (the card8 (ldb (byte 8 0) v)))
  v)

)

(defsetf aref-card8 (a i) (v)
  `(aset-card8 ,v ,a ,i))

(defsetf aref-int8 (a i) (v)
  `(aset-int8 ,v ,a ,i))

(defsetf aref-card16 (a i) (v)
  `(aset-card16 ,v ,a ,i))

(defsetf aref-int16 (a i) (v)
  `(aset-int16 ,v ,a ,i))

(defsetf aref-card32 (a i) (v)
  `(aset-card32 ,v ,a ,i))

(defsetf aref-int32 (a i) (v)
  `(aset-int32 ,v ,a ,i))

(defsetf aref-card29 (a i) (v)
  `(aset-card29 ,v ,a ,i))

;;; Other random conversions

(defun rgb-val->card16 (value)
  ;; Short floats are good enough
  (declare (type rgb-val value))
  (declare (clx-values card16))
  #.(declare-buffun)
  ;; Convert VALUE from float to card16
  (the card16 (values (round (the rgb-val value) #.(/ 1.0s0 #xffff)))))

(defun card16->rgb-val (value) 
  ;; Short floats are good enough
  (declare (type card16 value))
  (declare (clx-values short-float))
  #.(declare-buffun)
  ;; Convert VALUE from card16 to float
  (the short-float (* (the card16 value) #.(/ 1.0s0 #xffff))))

(defun radians->int16 (value)
  ;; Short floats are good enough
  (declare (type angle value))
  (declare (clx-values int16))
  #.(declare-buffun)
  (the int16 (values (round (the angle value) #.(float (/ pi 180.0s0 64.0s0) 0.0s0)))))

(defun int16->radians (value)
  ;; Short floats are good enough
  (declare (type int16 value))
  (declare (clx-values short-float))
  #.(declare-buffun)
  (the short-float (* (the int16 value) #.(coerce (/ pi 180.0 64.0) 'short-float))))


#+(or cmu sbcl) (progn

;;; This overrides the (probably incorrect) definition in clx.lisp.  Since PI
;;; is irrational, there can't be a precise rational representation.  In
;;; particular, the different float approximations will always be /=.  This
;;; causes problems with type checking, because people might compute an
;;; argument in any precision.  What we do is discard all the excess precision
;;; in the value, and see if the protocal encoding falls in the desired range
;;; (64'ths of a degree.)
;;;
(deftype angle () '(satisfies anglep))

(defun anglep (x)
  (and (typep x 'real)
       (<= (* -360 64) (radians->int16 x) (* 360 64))))

)


;;-----------------------------------------------------------------------------
;; Character transformation
;;-----------------------------------------------------------------------------


;;; This stuff transforms chars to ascii codes in card8's and back.
;;; You might have to hack it a little to get it to work for your machine.

(declaim (inline char->card8 card8->char))

(macrolet ((char-translators ()
	     (let ((alist
		     `(#-lispm
		       ;; The normal ascii codes for the control characters.
		       ,@`((#\Return . 13)
			   (#\Linefeed . 10)
			   (#\Rubout . 127)
			   (#\Page . 12)
			   (#\Tab . 9)
			   (#\Backspace . 8)
			   (#\Newline . 10)
			   (#\Space . 32))
		       ;; One the lispm, #\Newline is #\Return, but we'd really like
		       ;; #\Newline to translate to ascii code 10, so we swap the
		       ;; Ascii codes for #\Return and #\Linefeed. We also provide
		       ;; mappings from the counterparts of these control characters
		       ;; so that the character mapping from the lisp machine
		       ;; character set to ascii is invertible.
		       #+lispm
		       ,@`((#\Return . 10)   (,(code-char  10) . ,(char-code #\Return))
			   (#\Linefeed . 13) (,(code-char  13) . ,(char-code #\Linefeed))
			   (#\Rubout . 127)  (,(code-char 127) . ,(char-code #\Rubout))
			   (#\Page . 12)     (,(code-char  12) . ,(char-code #\Page))
			   (#\Tab . 9)       (,(code-char   9) . ,(char-code #\Tab))
			   (#\Backspace . 8) (,(code-char   8) . ,(char-code #\Backspace))
			   (#\Newline . 10)  (,(code-char  10) . ,(char-code #\Newline))
			   (#\Space . 32)    (,(code-char  32) . ,(char-code #\Space)))
		       ;; The rest of the common lisp charater set with the normal
		       ;; ascii codes for them.
		       (#\! . 33) (#\" . 34) (#\# . 35) (#\$ . 36)
		       (#\% . 37) (#\& . 38) (#\' . 39) (#\( . 40)
		       (#\) . 41) (#\* . 42) (#\+ . 43) (#\, . 44)
		       (#\- . 45) (#\. . 46) (#\/ . 47) (#\0 . 48)
		       (#\1 . 49) (#\2 . 50) (#\3 . 51) (#\4 . 52)
		       (#\5 . 53) (#\6 . 54) (#\7 . 55) (#\8 . 56)
		       (#\9 . 57) (#\: . 58) (#\; . 59) (#\< . 60)
		       (#\= . 61) (#\> . 62) (#\? . 63) (#\@ . 64)
		       (#\A . 65) (#\B . 66) (#\C . 67) (#\D . 68)
		       (#\E . 69) (#\F . 70) (#\G . 71) (#\H . 72)
		       (#\I . 73) (#\J . 74) (#\K . 75) (#\L . 76)
		       (#\M . 77) (#\N . 78) (#\O . 79) (#\P . 80)
		       (#\Q . 81) (#\R . 82) (#\S . 83) (#\T . 84)
		       (#\U . 85) (#\V . 86) (#\W . 87) (#\X . 88)
		       (#\Y . 89) (#\Z . 90) (#\[ . 91) (#\\ . 92)
		       (#\] . 93) (#\^ . 94) (#\_ . 95) (#\` . 96)
		       (#\a . 97) (#\b . 98) (#\c . 99) (#\d . 100)
		       (#\e . 101) (#\f . 102) (#\g . 103) (#\h . 104)
		       (#\i . 105) (#\j . 106) (#\k . 107) (#\l . 108)
		       (#\m . 109) (#\n . 110) (#\o . 111) (#\p . 112)
		       (#\q . 113) (#\r . 114) (#\s . 115) (#\t . 116)
		       (#\u . 117) (#\v . 118) (#\w . 119) (#\x . 120)
		       (#\y . 121) (#\z . 122) (#\{ . 123) (#\| . 124)
		       (#\} . 125) (#\~ . 126))))
	       (cond ((dolist (pair alist nil)
			(when (not (= (char-code (car pair)) (cdr pair)))
			  (return t)))
		      `(progn
			 (defconstant *char-to-card8-translation-table*
				      ',(let ((array (make-array
						       (let ((max-char-code 255))
							 (dolist (pair alist)
							   (setq max-char-code
								 (max max-char-code
								      (char-code (car pair)))))
							 (1+ max-char-code))
						       :element-type 'card8)))
					  (dotimes (i (length array))
					    (setf (aref array i) (mod i 256)))
					  (dolist (pair alist)
					    (setf (aref array (char-code (car pair)))
						  (cdr pair)))
					  array))
			 (defconstant *card8-to-char-translation-table*
				      ',(let ((array (make-array 256)))
					  (dotimes (i (length array))
					    (setf (aref array i) (code-char i)))
					  (dolist (pair alist)
					    (setf (aref array (cdr pair)) (car pair)))
					  array))
			 #-Genera
			 (progn
  			   (defun char->card8 (char)
			     (declare (type base-char char))
			     #.(declare-buffun)
			     (the card8 (aref (the (simple-array card8 (*))
						   *char-to-card8-translation-table*)
					      (the array-index (char-code char)))))
			   (defun card8->char (card8)
			     (declare (type card8 card8))
			     #.(declare-buffun)
			     (the base-char
				  (or (aref (the simple-vector *card8-to-char-translation-table*)
					    card8)
				      (error "Invalid CHAR code ~D." card8))))
			   )
			 #+Genera
			 (progn
			   (defun char->card8 (char)
			     (declare lt:(side-effects reader reducible))
			     (aref *char-to-card8-translation-table* (char-code char)))
			   (defun card8->char (card8)
			     (declare lt:(side-effects reader reducible))
			     (aref *card8-to-char-translation-table* card8))
			   )
			 #-Minima
			 (dotimes (i 256)
			   (unless (= i (char->card8 (card8->char i)))
			     (warn "The card8->char mapping is not invertible through char->card8.  Info:~%~S"
				   (list i
					 (card8->char i)
					 (char->card8 (card8->char i))))
			     (return nil)))
			 #-Minima
			 (dotimes (i (length *char-to-card8-translation-table*))
			   (let ((char (code-char i)))
			     (unless (eql char (card8->char (char->card8 char)))
			       (warn "The char->card8 mapping is not invertible through card8->char.  Info:~%~S"
				     (list char
					   (char->card8 char)
					   (card8->char (char->card8 char))))
			       (return nil))))))
		     (t
		      `(progn
			 (defun char->card8 (char)
			   (declare (type base-char char))
			   #.(declare-buffun)
			   (the card8 (char-code char)))
			 (defun card8->char (card8)
			   (declare (type card8 card8))
			   #.(declare-buffun)
			   (the base-char (code-char card8)))
			 ))))))
  (char-translators))

;;-----------------------------------------------------------------------------
;; Process Locking
;;
;;	Common-Lisp doesn't provide process locking primitives, so we define
;;	our own here, based on Zetalisp primitives.  Holding-Lock is very
;;	similar to with-lock on The TI Explorer, and a little more efficient
;;	than with-process-lock on a Symbolics.
;;-----------------------------------------------------------------------------

;;; MAKE-PROCESS-LOCK: Creating a process lock.

#-(or LispM excl Minima (and cmu mp))
(defun make-process-lock (name)
  (declare (ignore name))
  nil)

#+excl
(defun make-process-lock (name)
  (mp:make-process-lock :name name))

#+(and LispM (not Genera))
(defun make-process-lock (name)
  (vector nil name))

#+Genera
(defun make-process-lock (name)
  (process:make-lock name :flavor 'clx-lock))

#+Minima
(defun make-process-lock (name)
  (minima:make-lock name :recursive t))

#+(and cmu mp)
(defun make-process-lock (name)
  (mp:make-lock name))

;;; HOLDING-LOCK: Execute a body of code with a lock held.

;;; The holding-lock macro takes a timeout keyword argument.  EVENT-LISTEN
;;; passes its timeout to the holding-lock macro, so any timeout you want to
;;; work for event-listen you should do for holding-lock.

;; If you're not sharing DISPLAY objects within a multi-processing
;; shared-memory environment, this is sufficient
898
#-(or lispm excl lcl3.0 Minima (and CMU mp) )
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(defmacro holding-lock ((locator display &optional whostate &key timeout) &body body)
  (declare (ignore locator display whostate timeout))
  `(progn ,@body))

;;; HOLDING-LOCK for CMU Common Lisp.
;;;
;;; We are not multi-processing, but we use this macro to try to protect
;;; against re-entering request functions.  This can happen if an interrupt
;;; occurs and the handler attempts to use X over the same display connection.
;;; This can happen if the GC hooks are used to notify the user over the same
;;; display connection.  We inhibit GC notifications since display of them
;;; could cause recursive entry into CLX.
;;;
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#+(or (and CMU (not mp)))
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(defmacro holding-lock ((locator display &optional whostate &key timeout)
			&body body)
  `(let #+cmu((ext:*gc-verbose* nil)
	      (ext:*gc-inhibit-hook* nil)
	      (ext:*before-gc-hooks* nil)
	      (ext:*after-gc-hooks* nil))
	#+sbcl()
     ,locator ,display ,whostate ,timeout
     (system:without-interrupts (progn ,@body))))

;;; HOLDING-LOCK for CMU Common Lisp with multi-processes.
;;;
#+(and cmu mp)
(defmacro holding-lock ((lock display &optional (whostate "CLX wait")
			      &key timeout)
			&body body)
  (declare (ignore display))
  `(mp:with-lock-held (,lock ,whostate ,@(and timeout `(:timeout ,timeout)))
    ,@body))

#+Genera
(defmacro holding-lock ((locator display &optional whostate &key timeout)
			&body body)
  (declare (ignore whostate))
  `(process:with-lock (,locator :timeout ,timeout)
     (let ((.debug-io. (buffer-debug-io ,display)))
       (scl:let-if .debug-io. ((*debug-io* .debug-io.))
	 ,@body))))

#+(and lispm (not Genera))
(defmacro holding-lock ((locator display &optional whostate &key timeout)
			&body body)
  (declare (ignore display))
  ;; This macro is for use in a multi-process environment.
  (let ((lock (gensym))
	(have-lock (gensym))
	(timeo (gensym)))
    `(let* ((,lock (zl:locf (svref ,locator 0)))
	    (,have-lock (eq (car ,lock) sys:current-process))
	    (,timeo ,timeout))
       (unwind-protect 
	   (when (cond (,have-lock)
		       ((#+explorer si:%store-conditional
			 #-explorer sys:store-conditional
			 ,lock nil sys:current-process))
		       ((null ,timeo)
			(sys:process-lock ,lock nil ,(or whostate "CLX Lock")))
		       ((sys:process-wait-with-timeout
			    ,(or whostate "CLX Lock") (round (* ,timeo 60.))
			  #'(lambda (lock process)
			      (#+explorer si:%store-conditional
			       #-explorer sys:store-conditional
			       lock nil process))
			  ,lock sys:current-process)))
	     ,@body)
	 (unless ,have-lock
	   (#+explorer si:%store-conditional
	    #-explorer sys:store-conditional
	    ,lock sys:current-process nil))))))

;; Lucid has a process locking mechanism as well under release 3.0
#+lcl3.0
(defmacro holding-lock ((locator display &optional whostate &key timeout)
			&body body)
  (declare (ignore display))
  (if timeout
      ;; Hair to support timeout.
      `(let ((.have-lock. (eq ,locator lcl:*current-process*))
	     (.timeout. ,timeout))
	 (unwind-protect
	     (when (cond (.have-lock.)
			 ((conditional-store ,locator nil lcl:*current-process*))
			 ((null .timeout.)
			  (lcl:process-lock ,locator)
			  t)
			 ((lcl:process-wait-with-timeout ,whostate .timeout.
			    #'(lambda ()
				(conditional-store ,locator nil lcl:*current-process*))))
			 ;; abort the PROCESS-UNLOCK if actually timing out
			 (t
			  (setf .have-lock. :abort)
			  nil))
	       ,@body)
	   (unless .have-lock. 
	     (lcl:process-unlock ,locator))))
    `(lcl:with-process-lock (,locator)
       ,@body)))


#+excl
(defmacro holding-lock ((locator display &optional whostate &key timeout)
			&body body)
  (declare (ignore display))
  `(let (.hl-lock. .hl-obtained-lock. .hl-curproc.)
     (unwind-protect
	 (block .hl-doit.
	   (when mp::*scheduler-stack-group* ; fast test for scheduler running
	     (setq .hl-lock. ,locator
		   .hl-curproc. mp::*current-process*)
	     (when (and .hl-curproc.	; nil if in process-wait fun
			(not (eq (mp::process-lock-locker .hl-lock.)
				 .hl-curproc.)))
	       ;; Then we need to grab the lock.
	       ,(if timeout
		    `(if (not (mp::process-lock .hl-lock. .hl-curproc.
						,whostate ,timeout))
			 (return-from .hl-doit. nil))
		  `(mp::process-lock .hl-lock. .hl-curproc.
				     ,@(when whostate `(,whostate))))
	       ;; There is an apparent race condition here.  However, there is
	       ;; no actual race condition -- our implementation of mp:process-
	       ;; lock guarantees that the lock will still be held when it
	       ;; returns, and no interrupt can happen between that and the
	       ;; execution of the next form.  -- jdi 2/27/91
	       (setq .hl-obtained-lock. t)))
	   ,@body)
       (if (and .hl-obtained-lock.
		;; Note -- next form added to allow error handler inside
		;; body to unlock the lock prematurely if it knows that
		;; the current process cannot possibly continue but will
		;; throw out (or is it throw up?).
		(eq (mp::process-lock-locker .hl-lock.) .hl-curproc.))
	   (mp::process-unlock .hl-lock. .hl-curproc.)))))

#+Minima
(defmacro holding-lock ((locator display &optional whostate &key timeout) &body body)
  `(holding-lock-1 #'(lambda () ,@body) ,locator ,display
		   ,@(and whostate `(:whostate ,whostate))
		   ,@(and timeout `(:timeout ,timeout))))

#+Minima
(defun holding-lock-1 (continuation lock display &key (whostate "Lock") timeout)
  (declare (dynamic-extent continuation))
  (declare (ignore display whostate timeout))
  (minima:with-lock (lock)
    (funcall continuation)))

;;; WITHOUT-ABORTS

;;; If you can inhibit asynchronous keyboard aborts inside the body of this
;;; macro, then it is a good idea to do this.  This macro is wrapped around
;;; request writing and reply reading to ensure that requests are atomically
;;; written and replies are atomically read from the stream.

#-(or Genera excl lcl3.0)
(defmacro without-aborts (&body body)
  `(progn ,@body))

#+Genera
(defmacro without-aborts (&body body)
  `(sys:without-aborts (clx "CLX is in the middle of an operation that should be atomic.")
     ,@body))

#+excl
(defmacro without-aborts (&body body)
  `(without-interrupts ,@body))
    
#+lcl3.0
(defmacro without-aborts (&body body)
  `(lcl:with-interruptions-inhibited ,@body))

;;; PROCESS-BLOCK: Wait until a given predicate returns a non-NIL value.
;;; Caller guarantees that PROCESS-WAKEUP will be called after the predicate's
;;; value changes.

#-(or lispm excl lcl3.0 Minima (and cmu mp))
(defun process-block (whostate predicate &rest predicate-args)
  (declare (ignore whostate))
  (or (apply predicate predicate-args)
      (error "Program tried to wait with no scheduler.")))

#+Genera
(defun process-block (whostate predicate &rest predicate-args)
  (declare (type function predicate)
	   #+clx-ansi-common-lisp
	   (dynamic-extent predicate)
	   #-clx-ansi-common-lisp
	   (sys:downward-funarg predicate))
  (apply #'process:block-process whostate predicate predicate-args))

#+(and lispm (not Genera))
(defun process-block (whostate predicate &rest predicate-args)
  (declare (type function predicate)
	   #+clx-ansi-common-lisp
	   (dynamic-extent predicate)
	   #-clx-ansi-common-lisp 
	   (sys:downward-funarg predicate))
  (apply #'global:process-wait whostate predicate predicate-args))

#+excl
(defun process-block (whostate predicate &rest predicate-args)
  (if mp::*scheduler-stack-group*
      (apply #'mp::process-wait whostate predicate predicate-args)
      (or (apply predicate predicate-args)
	  (error "Program tried to wait with no scheduler."))))

#+lcl3.0
(defun process-block (whostate predicate &rest predicate-args)
  (declare (dynamic-extent predicate-args))
  (apply #'lcl:process-wait whostate predicate predicate-args))

#+Minima
(defun process-block (whostate predicate &rest predicate-args)
  (declare (type function predicate)
	   (dynamic-extent predicate))
  (apply #'minima:process-wait whostate predicate predicate-args))

#+(and cmu mp)
(defun process-block (whostate predicate &rest predicate-args)
  (declare (type function predicate))
  (mp:process-wait whostate #'(lambda ()
				(apply predicate predicate-args))))

;;; PROCESS-WAKEUP: Check some other process' wait function.

(declaim (inline process-wakeup))

#-(or excl Genera Minima (and cmu mp))
(defun process-wakeup (process)
  (declare (ignore process))
  nil)

#+excl
(defun process-wakeup (process)
  (let ((curproc mp::*current-process*))
    (when (and curproc process)
      (unless (mp::process-p curproc)
	(error "~s is not a process" curproc))
      (unless (mp::process-p process)
	(error "~s is not a process" process))
      (if (> (mp::process-priority process) (mp::process-priority curproc))
	  (mp::process-allow-schedule process)))))

#+Genera
(defun process-wakeup (process)
  (process:wakeup process))

#+Minima
(defun process-wakeup (process)
  (when process
    (minima:process-wakeup process)))

#+(and cmu mp)
(defun process-wakeup (process)
  (declare (ignore process))
  (mp:process-yield))

;;; CURRENT-PROCESS: Return the current process object for input locking and
;;; for calling PROCESS-WAKEUP.

(declaim (inline current-process))

;;; Default return NIL, which is acceptable even if there is a scheduler.

#-(or lispm excl lcl3.0 Minima (and cmu mp))
(defun current-process ()
  nil)

#+lispm
(defun current-process ()
  sys:current-process)

#+excl
(defun current-process ()
  (and mp::*scheduler-stack-group*
       mp::*current-process*))

#+lcl3.0
(defun current-process ()
  lcl:*current-process*)

#+Minima
(defun current-process ()
  (minima:current-process))

#+(and cmu mp)
(defun current-process ()
  mp:*current-process*)

;;; WITHOUT-INTERRUPTS -- provide for atomic operations.

#-(or lispm excl lcl3.0 Minima cmu)
(defmacro without-interrupts (&body body)
  `(progn ,@body))

#+(and lispm (not Genera))
(defmacro without-interrupts (&body body)
  `(sys:without-interrupts ,@body))

#+Genera
(defmacro without-interrupts (&body body)
  `(process:with-no-other-processes ,@body))

#+LCL3.0
(defmacro without-interrupts (&body body)
  `(lcl:with-scheduling-inhibited ,@body))

#+Minima
(defmacro without-interrupts (&body body)
  `(minima:with-no-other-processes ,@body))

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(defmacro without-interrupts (&body body)
  `(system:without-interrupts ,@body))

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(defmacro without-interrupts (&body body)
  `(sb-sys:without-interrupts ,@body))

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;;; CONDITIONAL-STORE:

;; This should use GET-SETF-METHOD to avoid evaluating subforms multiple times.
;; It doesn't because CLtL doesn't pass the environment to GET-SETF-METHOD.
(defmacro conditional-store (place old-value new-value)
  `(without-interrupts
     (cond ((eq ,place ,old-value)
	    (setf ,place ,new-value)
	    t))))

;;;----------------------------------------------------------------------------
;;; IO Error Recovery
;;;	All I/O operations are done within a WRAP-BUF-OUTPUT macro.
;;;	It prevents multiple mindless errors when the network craters.
;;;
;;;----------------------------------------------------------------------------

#-Genera
(defmacro wrap-buf-output ((buffer) &body body)
  ;; Error recovery wrapper
  `(unless (buffer-dead ,buffer)
     ,@body))

#+Genera
(defmacro wrap-buf-output ((buffer) &body body)
  ;; Error recovery wrapper
  `(let ((.buffer. ,buffer))
     (unless (buffer-dead .buffer.)
       (scl:condition-bind
	 (((sys:network-error)
	   #'(lambda (error)
	       (scl:condition-case () 
		    (funcall (buffer-close-function .buffer.) .buffer. :abort t)
		  (sys:network-error))
	       (setf (buffer-dead .buffer.) error)
	       (setf (buffer-output-stream .buffer.) nil)
	       (setf (buffer-input-stream .buffer.) nil)
	       nil)))
	 ,@body))))

#-Genera
(defmacro wrap-buf-input ((buffer) &body body)
  (declare (ignore buffer))
  ;; Error recovery wrapper
  `(progn ,@body))

#+Genera
(defmacro wrap-buf-input ((buffer) &body body)
  ;; Error recovery wrapper
  `(let ((.buffer. ,buffer))
     (scl:condition-bind
       (((sys:network-error)
	 #'(lambda (error)
	     (scl:condition-case () 
		  (funcall (buffer-close-function .buffer.) .buffer. :abort t)
		(sys:network-error))
	     (setf (buffer-dead .buffer.) error)
	     (setf (buffer-output-stream .buffer.) nil)
	     (setf (buffer-input-stream .buffer.) nil)
	     nil)))
       ,@body)))


;;;----------------------------------------------------------------------------
;;; System dependent IO primitives
;;;	Functions for opening, reading writing forcing-output and closing 
;;;	the stream to the server.
;;;----------------------------------------------------------------------------

;;; OPEN-X-STREAM - create a stream for communicating to the appropriate X
;;; server

#-(or explorer Genera lucid kcl ibcl excl Minima CMU sbcl)
(defun open-x-stream (host display protocol)
  host display protocol ;; unused
  (error "OPEN-X-STREAM not implemented yet."))

;;; Genera:

;;; TCP and DNA are both layered products, so try to work with either one.

#+Genera
(when (fboundp 'tcp:add-tcp-port-for-protocol)
  (tcp:add-tcp-port-for-protocol :x-window-system 6000))

#+Genera
(when (fboundp 'dna:add-dna-contact-id-for-protocol)
  (dna:add-dna-contact-id-for-protocol :x-window-system "X$X0"))

#+Genera
(net:define-protocol :x-window-system (:x-window-system :byte-stream)
  (:invoke-with-stream ((stream :characters nil :ascii-translation nil))
    stream))

#+Genera
(eval-when (compile)
  (compiler:function-defined 'tcp:open-tcp-stream)
  (compiler:function-defined 'dna:open-dna-bidirectional-stream))

#+Genera
(defun open-x-stream (host display protocol)
  (let ((host (net:parse-host host)))
    (if (or protocol (plusp display))
	;; The protocol was specified or the display isn't 0, so we
	;; can't use the Generic Network System.  If the protocol was
	;; specified, then use that protocol, otherwise, blindly use
	;; TCP.
	(ccase protocol
	  ((:tcp nil)
	   (tcp:open-tcp-stream
	     host (+ *x-tcp-port* display) nil
	     :direction :io
	     :characters nil
	     :ascii-translation nil))
	  ((:dna)
	   (dna:open-dna-bidirectional-stream
	     host (format nil "X$X~D" display)
	     :characters nil
	     :ascii-translation nil)))
      (let ((neti:*invoke-service-automatic-retry* t))
	(net:invoke-service-on-host :x-window-system host)))))

#+explorer
(defun open-x-stream (host display protocol)
  (declare (ignore protocol))
  (net:open-connection-on-medium
    (net:parse-host host)			;Host
    :byte-stream				;Medium
    "X11"					;Logical contact name
    :stream-type :character-stream
    :direction :bidirectional
    :timeout-after-open nil
    :remote-port (+ *x-tcp-port* display)))

#+explorer
(net:define-logical-contact-name
  "X11"
  `((:local "X11")
    (:chaos "X11")
    (:nsp-stream "X11")
    (:tcp ,*x-tcp-port*)))

#+lucid
(defun open-x-stream (host display protocol)
  protocol ;; unused
  (let ((fd (connect-to-server host display)))
    (when (minusp fd)
      (error "Failed to connect to server: ~A ~D" host display))
    (user::make-lisp-stream :input-handle fd
			    :output-handle fd
			    :element-type 'unsigned-byte
			    #-lcl3.0 :stream-type #-lcl3.0 :ephemeral)))

#+(or kcl ibcl)
(defun open-x-stream (host display protocol)
  protocol ;; unused
  (let ((stream (open-socket-stream host display)))
    (if (streamp stream)
	stream
      (error "Cannot connect to server: ~A:~D" host display))))

#+excl
;;
;; Note that since we don't use the CL i/o facilities to do i/o, the display
;; input and output "stream" is really a file descriptor (fixnum).
;;
(defun open-x-stream (host display protocol)
  (declare (ignore protocol));; unused
  (let ((fd (connect-to-server (string host) display)))
    (when (minusp fd)
      (error "Failed to connect to server: ~A ~D" host display))
    fd))

#+Minima
(defun open-x-stream (host display protocol)
  (declare (ignore protocol));; unused
  (minima:open-tcp-stream :foreign-address (apply #'minima:make-ip-address
						  (cdr (host-address host)))
			  :foreign-port (+ *x-tcp-port* display)))

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#+sbcl
(defparameter +X-unix-socket-path+
  "/tmp/.X11-unix/X"
  "The location of the X socket")

#+sbcl
(defun open-x-stream (host display protocol)  
  (declare (ignore protocol)
           (type (integer 0) display))
  (socket-make-stream 
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   (if (or (string= host "") (string= host "unix")) ; AF_LOCAL domain socket
       (let ((s (make-instance 'local-socket :type :stream)))
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	 (socket-connect s (format nil "~A~D" +X-unix-socket-path+ display))
	 s)
       (let ((host (car (host-ent-addresses (get-host-by-name host)))))
	 (when host
	   (let ((s (make-instance 'inet-socket :type :stream :protocol :tcp)))
	     (socket-connect s host (+ 6000 display))
	     s))))
   :element-type '(unsigned-byte 8)
   :input t :output t :buffering :none))

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;;; BUFFER-READ-DEFAULT - read data from the X stream

#+(or Genera explorer)
(defun buffer-read-default (display vector start end timeout)
  ;; returns non-NIL if EOF encountered
  ;; Returns :TIMEOUT when timeout exceeded
  (declare (type display display)
	   (type buffer-bytes vector)
	   (type array-index start end)
	   (type (or null (real 0 *)) timeout))
  #.(declare-buffun)
  (let ((stream (display-input-stream display)))
    (or (cond ((null stream))
	      ((funcall stream :listen) nil)
	      ((and timeout (= timeout 0)) :timeout)
	      ((buffer-input-wait-default display timeout)))
	(multiple-value-bind (ignore eofp)
	    (funcall stream :string-in nil vector start end)
	  eofp))))


#+excl
;;
;; Rewritten 10/89 to not use foreign function interface to do I/O.
;;
(defun buffer-read-default (display vector start end timeout)
  (declare (type display display)
	   (type buffer-bytes vector)
	   (type array-index start end)
	   (type (or null (real 0 *)) timeout))
  #.(declare-buffun)
    
  (let* ((howmany (- end start))
	 (fd (display-input-stream display)))
    (declare (type array-index howmany)
	     (fixnum fd))
    (or (cond ((fd-char-avail-p fd) nil)
	      ((and timeout (= timeout 0)) :timeout)
	      ((buffer-input-wait-default display timeout)))
	(fd-read-bytes fd vector start howmany))))


#+lcl3.0
(defmacro with-underlying-stream ((variable stream display direction) &body body)
  `(let ((,variable
	  (or (getf (display-plist ,display) ',direction)
	      (setf (getf (display-plist ,display) ',direction)
		    (lucid::underlying-stream
		      ,stream ,(if (eq direction 'input) :input :output))))))
     ,@body))

#+lcl3.0
(defun buffer-read-default (display vector start end timeout)
  ;;Note that LISTEN must still be done on "slow stream" or the I/O system
  ;;gets confused.  But reading should be done from "fast stream" for speed.
  ;;We used to inhibit scheduling because there were races in Lucid's
  ;;multitasking system.  Empirical evidence suggests they may be gone now.
  ;;Should you decide you need to inhibit scheduling, do it around the
  ;;lcl:read-array.
  (declare (type display display)
	   (type buffer-bytes vector)
	   (type array-index start end)
	   (type (or null (real 0 *)) timeout))
  #.(declare-buffun)
  (let ((stream (display-input-stream display)))
    (declare (type (or null stream) stream))
    (or (cond ((null stream))
	      ((listen stream) nil)
	      ((and timeout (= timeout 0)) :timeout)
	      ((buffer-input-wait-default display timeout)))
	(with-underlying-stream (stream stream display input)
	  (eq (lcl:read-array stream vector start end nil :eof) :eof)))))

#+Minima
(defun buffer-read-default (display vector start end timeout)
  ;; returns non-NIL if EOF encountered
  ;; Returns :TIMEOUT when timeout exceeded
  (declare (type display display)
	   (type buffer-bytes vector)
	   (type array-index start end)
	   (type (or null (real 0 *)) timeout))
  #.(declare-buffun)
  (let ((stream (display-input-stream display)))
    (or (cond ((null stream))
	      ((listen stream) nil)
	      ((and timeout (= timeout 0)) :timeout)
	      ((buffer-input-wait-default display timeout)))
	(eq :eof (minima:read-vector vector stream nil start end)))))

;;; BUFFER-READ-DEFAULT for CMU Common Lisp.
;;;
;;;    If timeout is 0, then we call LISTEN to see if there is any input.
;;; Timeout 0 is the only case where READ-INPUT dives into BUFFER-READ without
;;; first calling BUFFER-INPUT-WAIT-DEFAULT.
;;;
#+(or CMU sbcl)
(defun buffer-read-default (display vector start end timeout)
  (declare (type display display)
	   (type buffer-bytes vector)
	   (type array-index start end)
	   (type (or null fixnum) timeout))
  #.(declare-buffun)
  (cond ((and (eql timeout 0)
	      (not (listen (display-input-stream display))))
	 :timeout)
	(t
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	 (#+cmu system:read-n-bytes
	  #+sbcl sb-sys:read-n-bytes
	  (display-input-stream display)
	  vector start (- end start))
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	 nil)))


;;; WARNING:
;;;	CLX performance will suffer if your lisp uses read-byte for
;;;	receiving all data from the X Window System server.
;;;	You are encouraged to write a specialized version of
;;;	buffer-read-default that does block transfers.
#-(or Genera explorer excl lcl3.0 Minima CMU sbcl)
(defun buffer-read-default (display vector start end timeout)
  (declare (type display display)
	   (type buffer-bytes vector)
	   (type array-index start end)
	   (type (or null (real 0 *)) timeout))
  #.(declare-buffun)
  (let ((stream (display-input-stream display)))
    (declare (type (or null stream) stream))
    (or (cond ((null stream))
	      ((listen stream) nil)
	      ((and timeout (= timeout 0)) :timeout)
	      ((buffer-input-wait-default display timeout)))
	(do* ((index start (index1+ index)))
	     ((index>= index end) nil)
	  (declare (type array-index index))
	  (let ((c (read-byte stream nil nil)))
	    (declare (type (or null card8) c))
	    (if (null c)
		(return t)
	      (setf (aref vector index) (the card8 c))))))))

;;; BUFFER-WRITE-DEFAULT - write data to the X stream

#+(or Genera explorer)
(defun buffer-write-default (vector display start end)
  ;; The default buffer write function for use with common-lisp streams
  (declare (type buffer-bytes vector)
	   (type display display)
	   (type array-index start end))
  #.(declare-buffun)
  (let ((stream (display-output-stream display)))
    (declare (type (or null stream) stream))
    (unless (null stream) 
      (write-string vector stream :start start :end end))))

#+excl
(defun buffer-write-default (vector display start end)
  (declare (type buffer-bytes vector)
	   (type display display)
	   (type array-index start end))
  #.(declare-buffun)
  (excl::filesys-write-bytes (display-output-stream display) vector start
			     (- end start)))
  
#+lcl3.0
(defun buffer-write-default (vector display start end)
  ;;We used to inhibit scheduling because there were races in Lucid's
  ;;multitasking system.  Empirical evidence suggests they may be gone now.
  ;;Should you decide you need to inhibit scheduling, do it around the
  ;;lcl:write-array.
  (declare (type display display)
	   (type buffer-bytes vector)
	   (type array-index start end))
  #.(declare-buffun)
  (let ((stream (display-output-stream display)))
    (declare (type (or null stream) stream))
    (unless (null stream) 
      (with-underlying-stream (stream stream display output)
	(lcl:write-array stream vector start end)))))

#+Minima
(defun buffer-write-default (vector display start end)
  ;; The default buffer write function for use with common-lisp streams
  (declare (type buffer-bytes vector)
	   (type display display)
	   (type array-index start end))
  #.(declare-buffun)
  (let ((stream (display-output-stream display)))
    (declare (type (or null stream) stream))
    (unless (null stream) 
      (minima:write-vector vector stream start end))))

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#+CMU
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(defun buffer-write-default (vector display start end)
  (declare (type buffer-bytes vector)
	   (type display display)
	   (type array-index start end))
  #.(declare-buffun)
  (system:output-raw-bytes (display-output-stream display) vector start end)
  nil)

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(defun buffer-write-default (vector display start end)
  (declare (type buffer-bytes vector)
	   (type display display)
	   (type array-index start end))
  #.(declare-buffun)
  (write-sequence vector (display-output-stream display) :start start :end end)
  nil)

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;;; WARNING:
;;;	CLX performance will be severely degraded if your lisp uses
;;;	write-byte to send all data to the X Window System server.
;;;	You are STRONGLY encouraged to write a specialized version
;;;	of buffer-write-default that does block transfers.

#-(or Genera explorer excl lcl3.0 Minima CMU sbcl)
(defun buffer-write-default (vector display start end)
  ;; The default buffer write function for use with common-lisp streams
  (declare (type buffer-bytes vector)
	   (type display display)
	   (type array-index start end))
  #.(declare-buffun)
  (let ((stream (display-output-stream display)))
    (declare (type (or null stream) stream))
    (unless (null stream)
      (with-vector (vector buffer-bytes)
	(do ((index start (index1+ index)))
	    ((index>= index end))
	  (declare (type array-index index))
	  (write-byte (aref vector index) stream))))))

;;; buffer-force-output-default - force output to the X stream

#+excl
(defun buffer-force-output-default (display)
  ;; buffer-write-default does the actual writing.
  (declare (ignore display)))

#-(or excl)
(defun buffer-force-output-default (display)
  ;; The default buffer force-output function for use with common-lisp streams
  (declare (type display display))
  (let ((stream (display-output-stream display)))
    (declare (type (or null stream) stream))
    (unless (null stream)
      (force-output stream))))

;;; BUFFER-CLOSE-DEFAULT - close the X stream

#+excl
(defun buffer-close-default (display &key abort)
  ;; The default buffer close function for use with common-lisp streams
  (declare (type display display)
	   (ignore abort))
  #.(declare-buffun)
  (excl::filesys-checking-close (display-output-stream display)))

#-(or excl)
(defun buffer-close-default (display &key abort)
  ;; The default buffer close function for use with common-lisp streams
  (declare (type display display))
  #.(declare-buffun)
  (let ((stream (display-output-stream display)))
    (declare (type (or null stream) stream))
    (unless (null stream)
      (close stream :abort abort))))

;;; BUFFER-INPUT-WAIT-DEFAULT - wait for for input to be available for the
;;; buffer.  This is called in read-input between requests, so that a process
;;; waiting for input is abortable when between requests.  Should return
;;; :TIMEOUT if it times out, NIL otherwise.

;;; The default implementation

;; Poll for input every *buffer-read-polling-time* SECONDS.
#-(or Genera explorer excl lcl3.0 CMU sbcl)
(defparameter *buffer-read-polling-time* 0.5)

#-(or Genera explorer excl lcl3.0 CMU sbcl)
(defun buffer-input-wait-default (display timeout)
  (declare (type display display)
	   (type (or null (real 0 *)) timeout))
  (declare (clx-values timeout))
  
  (let ((stream (display-input-stream display)))
    (declare (type (or null stream) stream))
    (cond ((null stream))
	  ((listen stream) nil)
	  ((and timeout (= timeout 0)) :timeout)
	  ((not (null timeout))
	   (multiple-value-bind (npoll fraction)
	       (truncate timeout *buffer-read-polling-time*)
	     (dotimes (i npoll)			; Sleep for a time, then listen again
	       (sleep *buffer-read-polling-time*)
	       (when (listen stream)
		 (return-from buffer-input-wait-default nil)))
	     (when (plusp fraction)
	       (sleep fraction)			; Sleep a fraction of a second
	       (when (listen stream)		; and listen one last time
		 (return-from buffer-input-wait-default nil)))
	     :timeout)))))

#+(or CMU sbcl)
(defun buffer-input-wait-default (display timeout)
  (declare (type display display)
	   (type (or null number) timeout))
  (let ((stream (display-input-stream display)))
    (declare (type (or null stream) stream))
    (cond ((null stream))
	  ((listen stream) nil)
	  ((eql timeout 0) :timeout)
	  (t
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	   (if #+sbcl (sb-sys:wait-until-fd-usable (sb-sys:fd-stream-fd stream)
						   :input timeout)
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	       #+mp (mp:process-wait-until-fd-usable
		     (system:fd-stream-fd stream) :input timeout)
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	       #-(or sbcl mp) (system:wait-until-fd-usable
			       (system:fd-stream-fd stream) :input timeout)
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	       nil
	       :timeout)))))

#+Genera
(defun buffer-input-wait-default (display timeout)
  (declare (type display display)
	   (type (or null (real 0 *)) timeout))
  (declare (clx-values timeout))
  (let ((stream (display-input-stream display)))
    (declare (type (or null stream) stream))
    (cond ((null stream))
	  ((scl:send stream :listen) nil)
	  ((and timeout (= timeout 0)) :timeout)
	  ((null timeout) (si:stream-input-block stream "CLX Input"))
	  (t
	   (scl:condition-bind ((neti:protocol-timeout
				  #'(lambda (error)
				      (when (eq stream (scl:send error :stream))
					(return-from buffer-input-wait-default :timeout)))))
	     (neti:with-stream-timeout (stream :input timeout)
	       (si:stream-input-block stream "CLX Input")))))
    nil))

#+explorer
(defun buffer-input-wait-default (display timeout)
  (declare (type display display)
	   (type (or null (real 0 *)) timeout))
  (declare (clx-values timeout))
  (let ((stream (display-input-stream display)))
    (declare (type (or null stream) stream))
    (cond ((null stream))
	  ((zl:send stream :listen) nil)
	  ((and timeout (= timeout 0)) :timeout)
	  ((null timeout)
	   (si:process-wait "CLX Input" stream :listen))
	  (t
	   (unless (si:process-wait-with-timeout
		       "CLX Input" (round (* timeout 60.)) stream :listen)
	     (return-from buffer-input-wait-default :timeout))))
    nil))

#+excl
;;
;; This is used so an 'eq' test may be used to find out whether or not we can
;; safely throw this process out of the CLX read loop.
;;
(defparameter *read-whostate* "waiting for input from X server")

;;
;; Note that this function returns nil on error if the scheduler is running,
;; t on error if not.  This is ok since buffer-read will detect the error.
;;
#+excl
(defun buffer-input-wait-default (display timeout)
  (declare (type display display)
	   (type (or null (real 0 *)) timeout))
  (declare (clx-values timeout))
  (let ((fd (display-input-stream display)))
    (declare (fixnum fd))
    (when (>= fd 0)
      (cond ((fd-char-avail-p fd)
	     nil)
	    
	    ;; Otherwise no bytes were available on the socket
	    ((and timeout (= timeout 0))
	     ;; If there aren't enough and timeout == 0, timeout.
	     :timeout)
	  
	    ;; If the scheduler is running let it do timeouts.
	    (mp::*scheduler-stack-group*
	     #+allegro
	     (if (not
		  (mp:wait-for-input-available fd :whostate *read-whostate*
					       :wait-function #'fd-char-avail-p
					       :timeout timeout))
		 (return-from buffer-input-wait-default :timeout))
	     #-allegro
	     (mp::wait-for-input-available fd :whostate *read-whostate*
					   :wait-function #'fd-char-avail-p))
	    
	    ;; Otherwise we have to handle timeouts by hand, and call select()
	    ;; to block until input is available.  Note we don't really handle
	    ;; the interaction of interrupts and (numberp timeout) here.  XX
	    (t
	     (let ((res 0))
	       (declare (fixnum res))
	       (with-interrupt-checking-on
		(loop
		  (setq res (fd-wait-for-input fd (if (null timeout) 0
						    (truncate timeout))))
		  (cond ((plusp res)	; success
			 (return nil))
			((eq res 0)	; timeout
			 (return :timeout))
			((eq res -1)	; error
			 (return t))
			;; Otherwise we got an interrupt -- go around again.
			)))))))))

	   
#+lcl3.0
(defun buffer-input-wait-default (display timeout)
  (declare (type display display)
	   (type (or null (real 0 *)) timeout)
	   (clx-values timeout))
  #.(declare-buffun)
  (let ((stream (display-input-stream display)))
    (declare (type (or null stream) stream))
    (cond ((null stream))
	  ((listen stream) nil)
	  ((and timeout (= timeout 0)) :timeout)
	  ((with-underlying-stream (stream stream display input)
	     (lucid::waiting-for-input-from-stream stream
               (lucid::with-io-unlocked
		 (if (null timeout)
		     (lcl:process-wait "CLX Input" #'listen stream)
		   (lcl:process-wait-with-timeout
		     "CLX Input" timeout #'listen stream)))))
	   nil)
	  (:timeout))))


;;; BUFFER-LISTEN-DEFAULT - returns T if there is input available for the
;;; buffer. This should never block, so it can be called from the scheduler.

;;; The default implementation is to just use listen.
#-(or excl)
(defun buffer-listen-default (display)
  (declare (type display display))
  (let ((stream (display-input-stream display)))
    (declare (type (or null stream) stream))
    (if (null stream)
	t
      (listen stream))))

#+excl 
(defun buffer-listen-default (display)
  (declare (type display display))
  (let ((fd (display-input-stream display)))
    (declare (type fixnum fd))
    (if (= fd -1)
	t
      (fd-char-avail-p fd))))


;;;----------------------------------------------------------------------------
;;; System dependent speed hacks
;;;----------------------------------------------------------------------------

;;
;; WITH-STACK-LIST is used by WITH-STATE as a memory saving feature.
;; If your lisp doesn't have stack-lists, and you're worried about
;; consing garbage, you may want to re-write this to allocate and
;; initialize lists from a resource.
;;
#-lispm
(defmacro with-stack-list ((var &rest elements) &body body)
  ;; SYNTAX: (WITH-STACK-LIST (var exp1 ... expN) body)
  ;; Equivalent to (LET ((var (MAPCAR #'EVAL '(exp1 ... expN)))) body)
  ;; except that the list produced by MAPCAR resides on the stack and
  ;; therefore DISAPPEARS when WITH-STACK-LIST is exited.
  `(let ((,var (list ,@elements)))
     (declare (type cons ,var)
	      #+clx-ansi-common-lisp (dynamic-extent ,var))
     ,@body))

#-lispm
(defmacro with-stack-list* ((var &rest elements) &body body)
  ;; SYNTAX: (WITH-STACK-LIST* (var exp1 ... expN) body)
  ;; Equivalent to (LET ((var (APPLY #'LIST* (MAPCAR #'EVAL '(exp1 ... expN))))) body)
  ;; except that the list produced by MAPCAR resides on the stack and
  ;; therefore DISAPPEARS when WITH-STACK-LIST is exited.
  `(let ((,var (list* ,@elements)))
     (declare (type cons ,var)
	      #+clx-ansi-common-lisp (dynamic-extent ,var))
     ,@body))

(declaim (inline buffer-replace))

#+lispm
(defun buffer-replace (buf1 buf2 start1 end1 &optional (start2 0))
  (declare (type vector buf1 buf2)
	   (type array-index start1 end1 start2))
  (sys:copy-array-portion buf2 start2 (length buf2) buf1 start1 end1))

#+excl
(defun buffer-replace (target-sequence source-sequence target-start
				       target-end &optional (source-start 0))
  (declare (type buffer-bytes target-sequence source-sequence)
	   (type array-index target-start target-end source-start)
	   (optimize (speed 3) (safety 0)))
  
  (let ((source-end (length source-sequence)))
    (declare (type array-index source-end))
    
    (excl:if* (and (eq target-sequence source-sequence)
		   (> target-start source-start))
       then (let ((nelts (min (- target-end target-start)
			      (- source-end source-start))))
	      (do ((target-index (+ target-start nelts -1) (1- target-index))
		   (source-index (+ source-start nelts -1) (1- source-index)))
		  ((= target-index (1- target-start)) target-sequence)
		(declare (type array-index target-index source-index))
		
		(setf (aref target-sequence target-index)
		  (aref source-sequence source-index))))
       else (do ((target-index target-start (1+ target-index))
		 (source-index source-start (1+ source-index)))
		((or (= target-index target-end) (= source-index source-end))
		 target-sequence)
	      (declare (type array-index target-index source-index))

	      (setf (aref target-sequence target-index)
		(aref source-sequence source-index))))))

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#+cmu 
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(defun buffer-replace (buf1 buf2 start1 end1 &optional (start2 0))
  (declare (type buffer-bytes buf1 buf2)
	   (type array-index start1 end1 start2))
  #.(declare-buffun)
  (kernel:bit-bash-copy
   buf2 (+ (* start2 #+cmu vm:byte-bits #+sbcl sb-vm:n-byte-bits)
	   (* vm:vector-data-offset #+cmu vm:word-bits #+sbcl sb-vm:n-word-bits))
   buf1 (+ (* start1 #+cmu vm:byte-bits #+sbcl sb-vm:n-byte-bits)
	   (* vm:vector-data-offset #+cmu vm:word-bits #+sbcl sb-vm:n-word-bits))
   (* (- end1 start1) #+cmu vm:byte-bits #+sbcl sb-vm:n-byte-bits)))

#+lucid
;;;The compiler is *supposed* to optimize calls to replace, but in actual
;;;fact it does not.
(defun buffer-replace (buf1 buf2 start1 end1 &optional (start2 0))
  (declare (type buffer-bytes buf1 buf2)
	   (type array-index start1 end1 start2))
  #.(declare-buffun)
  (let ((end2 (lucid::%simple-8bit-vector-length buf2)))
    (declare (type array-index end2))
    (lucid::simple-8bit-vector-replace-internal
      buf1 buf2 start1 end1 start2 end2)))

#+(and clx-overlapping-arrays (not (or lispm excl)))
(defun buffer-replace (buf1 buf2 start1 end1 &optional (start2 0))
  (declare (type vector buf1 buf2)
	   (type array-index start1 end1 start2))
  (replace buf1 buf2 :start1 start1 :end1 end1 :start2 start2))

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#-(or lispm lucid excl CMU clx-overlapping-arrays)
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(defun buffer-replace (buf1 buf2 start1 end1 &optional (start2 0))
  (declare (type buffer-bytes buf1 buf2)
	   (type array-index start1 end1 start2))
  (replace buf1 buf2 :start1 start1 :end1 end1 :start2 start2))

#+ti
(defun with-location-bindings (sys:&quote bindings &rest body)
  (do ((bindings bindings (cdr bindings)))
      ((null bindings)
       (sys:eval-body-as-progn body))
    (sys:bind (sys:*eval `(sys:locf ,(caar bindings)))
	      (sys:*eval (cadar bindings)))))

#+ti
(compiler:defoptimizer with-location-bindings with-l-b-compiler nil (form)
  (let ((bindings (cadr form))
	(body (cddr form)))
    `(let ()
       ,@(loop for (accessor value) in bindings
	       collect `(si:bind (si:locf ,accessor) ,value))
       ,@body)))

#+ti
(defun (:property with-location-bindings compiler::cw-handler) (exp)
  (let* ((bindlist (mapcar #'compiler::cw-clause (second exp)))
	 (body (compiler::cw-clause (cddr exp))))
    (and compiler::cw-return-expansion-flag
	 (list* (first exp) bindlist body))))

#+(and lispm (not ti))
(defmacro with-location-bindings (bindings &body body)
  `(sys:letf* ,bindings ,@body))

#+lispm
(defmacro with-gcontext-bindings ((gc saved-state indexes ts-index temp-mask temp-gc)
				  &body body)
  ;; don't use svref on LHS because Symbolics didn't define locf for it
  (let* ((local-state (gensym))
	 (bindings `(((aref ,local-state ,ts-index) 0))))	; will become zero anyway
    (dolist (index indexes)
      (push `((aref ,local-state ,index) (svref ,saved-state ,index))
	    bindings))
    `(let ((,local-state (gcontext-local-state ,gc)))
       (declare (type gcontext-state ,local-state))
       (unwind-protect
	   (with-location-bindings ,bindings
	     ,@body)
	 (setf (svref ,local-state ,ts-index) 0)
	 (when ,temp-gc
	   (restore-gcontext-temp-state ,gc ,temp-mask ,temp-gc))
	 (deallocate-gcontext-state ,saved-state)))))

#-lispm
(defmacro with-gcontext-bindings ((gc saved-state indexes ts-index temp-mask temp-gc)
				  &body body)
  (let ((local-state (gensym))
	(resets nil))
    (dolist (index indexes)
      (push `(setf (svref ,local-state ,index) (svref ,saved-state ,index))
	    resets))
    `(unwind-protect
	 (progn
	   ,@body)
       (let ((,local-state (gcontext-local-state ,gc)))
	 (declare (type gcontext-state ,local-state))
	 ,@resets
	 (setf (svref ,local-state ,ts-index) 0))
       (when ,temp-gc
	 (restore-gcontext-temp-state ,gc ,temp-mask ,temp-gc))
       (deallocate-gcontext-state ,saved-state))))

;;;----------------------------------------------------------------------------
;;; How error detection should CLX do?
;;; Several levels are possible:
;;;
;;; 1. Do the equivalent of check-type on every argument.
;;; 
;;; 2. Simply report TYPE-ERROR.  This eliminates overhead of all the format
;;;    strings generated by check-type.
;;; 
;;; 3. Do error checking only on arguments that are likely to have errors
;;;    (like keyword names)
;;; 
;;; 4. Do error checking only where not doing so may dammage the envirnment
;;;    on a non-tagged machine (i.e. when storing into a structure that has
;;;    been passed in)
;;; 
;;; 5. No extra error detection code.  On lispm's, ASET may barf trying to
;;;    store a non-integer into a number array. 
;;; 
;;; How extensive should the error checking be?  For example, if the server
;;; expects a CARD16, is is sufficient for CLX to check for integer, or
;;; should it also check for non-negative and less than 65536?
;;;----------------------------------------------------------------------------
 
;; The *TYPE-CHECK?* constant controls how much error checking is done.
;; Possible values are:
;;    NIL      - Don't do any error checking
;;    t        - Do the equivalent of checktype on every argument
;;    :minimal - Do error checking only where errors are likely

;;; This controls macro expansion, and isn't changable at run-time You will
;;; probably want to set this to nil if you want good performance at
;;; production time.
(defconstant *type-check?*
  #+(or Genera Minima CMU sbcl) nil
  #-(or Genera Minima CMU sbcl) t)

;; TYPE? is used to allow the code to do error checking at a different level from
;; the declarations.  It also does some optimizations for systems that don't have
;; good compiler support for TYPEP.  The definitions for CARD32, CARD16, INT16, etc.
;; include range checks.  You can modify TYPE? to do less extensive checking
;; for these types if you desire.

;;
;; ### This comment is a lie!  TYPE? is really also used for run-time type
;; dispatching, not just type checking.  -- Ram.

(defmacro type? (object type)
  #+(or cmu sbcl)
  `(typep ,object ,type)
  #-(or cmu sbcl)
  (if (not (constantp type))
      `(typep ,object ,type)
    (progn
      (setq type (eval type))
      #+(or Genera explorer Minima)
      (if *type-check?*
	  `(locally (declare (optimize safety)) (typep ,object ',type))
	`(typep ,object ',type))
      #-(or Genera explorer Minima)
      (let ((predicate (assoc type
			      '((drawable drawable-p) (window window-p)
				(pixmap pixmap-p) (cursor cursor-p)
				(font font-p) (gcontext gcontext-p)
				(colormap colormap-p) (null null)
				(integer integerp)))))
	(cond (predicate
	       `(,(second predicate) ,object))
	      ((eq type 'generalized-boolean)
	       't)			; Everything is a generalized-boolean.
	      (*type-check?*
	       `(locally (declare (optimize safety)) (typep ,object ',type)))
	      (t
	       `(typep ,object ',type)))))))

;; X-TYPE-ERROR is the function called for type errors.
;; If you want lots of checking, but are concerned about code size,
;; this can be made into a macro that ignores some parameters.

(defun x-type-error (object type &optional error-string)
  (x-error 'x-type-error
	   :datum object
	   :expected-type type
	   :type-string error-string))


;;-----------------------------------------------------------------------------
;; Error handlers
;;    Hack up KMP error signaling using zetalisp until the real thing comes 
;;    along
;;-----------------------------------------------------------------------------

(defun default-error-handler (display error-key &rest key-vals
			      &key asynchronous &allow-other-keys)
  (declare (type generalized-boolean asynchronous)
	   (dynamic-extent key-vals))
  ;; The default display-error-handler.
  ;; It signals the conditions listed in the DISPLAY file.
  (if asynchronous
      (apply #'x-cerror "Ignore" error-key :display display :error-key error-key key-vals)
      (apply #'x-error error-key :display display :error-key error-key key-vals)))

#+(and lispm (not Genera) (not clx-ansi-common-lisp))
(defun x-error (condition &rest keyargs)
  (apply #'sys:signal condition keyargs))

#+(and lispm (not Genera) (not clx-ansi-common-lisp))
(defun x-cerror (proceed-format-string condition &rest keyargs)
  (sys:signal (apply #'zl:make-condition condition keyargs)
	      :proceed-types proceed-format-string))

#+(and Genera (not clx-ansi-common-lisp))
(defun x-error (condition &rest keyargs)
  (declare (dbg:error-reporter))
  (apply #'sys:signal condition keyargs))

#+(and Genera (not clx-ansi-common-lisp))
(defun x-cerror (proceed-format-string condition &rest keyargs)
  (declare (dbg:error-reporter))
  (apply #'sys:signal condition :continue-format-string proceed-format-string keyargs))

#+(or clx-ansi-common-lisp excl lcl3.0 (and CMU mp))
(defun x-error (condition &rest keyargs)
  (declare (dynamic-extent keyargs))
  (apply #'error condition keyargs))

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#+(or clx-ansi-common-lisp excl lcl3.0 CMU)
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(defun x-cerror (proceed-format-string condition &rest keyargs)
  (declare (dynamic-extent keyargs))
  (apply #'cerror proceed-format-string condition keyargs))

;;; X-ERROR for CMU Common Lisp
;;;
;;; We detect a couple condition types for which we disable event handling in
;;; our system.  This prevents going into the debugger or returning to a
;;; command prompt with CLX repeatedly seeing the same condition.  This occurs
;;; because CMU Common Lisp provides for all events (that is, X, input on file
;;; descriptors, Mach messages, etc.) to come through one routine anyone can
;;; use to wait for input.
;;;
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(defun x-error (condition &rest keyargs)
  (let ((condx (apply #'make-condition condition keyargs)))
    (when (eq condition 'closed-display)
      (let ((disp (closed-display-display condx)))
	(warn "Disabled event handling on ~S." disp)
	(ext::disable-clx-event-handling disp)))
    (error condx)))

#-(or lispm ansi-common-lisp excl lcl3.0 CMU sbcl)
(defun x-error (condition &rest keyargs)
  (error "X-Error: ~a"
	 (princ-to-string (apply #'make-condition condition keyargs))))

#-(or lispm clx-ansi-common-lisp excl lcl3.0 CMU sbcl)
(defun x-cerror (proceed-format-string condition &rest keyargs)
  (cerror proceed-format-string "X-Error: ~a"
	 (princ-to-string (apply #'make-condition condition keyargs))))

;; version 15 of Pitman error handling defines the syntax for define-condition to be:
;; DEFINE-CONDITION name (parent-type) [({slot}*) {option}*]
;; Where option is one of: (:documentation doc-string) (:conc-name symbol-or-string)
;; or (:report exp)

#+lcl3.0 
(defmacro define-condition (name parent-types &optional slots &rest args)
  `(lcl:define-condition
     ,name (,(first parent-types))
     ,(mapcar #'(lambda (slot) (if (consp slot) (car slot) slot))
	      slots)
     ,@args))

#+(and excl (not clx-ansi-common-lisp))
(defmacro define-condition (name parent-types &optional slots &rest args)
  `(excl::define-condition
     ,name (,(first parent-types))
     ,(mapcar #'(lambda (slot) (if (consp slot) (car slot) slot))
	      slots)
     ,@args))

#+(and CMU (not clx-ansi-common-lisp))
(defmacro define-condition (name parent-types &optional slots &rest args)
  `(common-lisp:define-condition
     ,name (,(first parent-types))
     ,(mapcar #'(lambda (slot) (if (consp slot) (car slot) slot))
	      slots)
     ,@args))

#+(and lispm (not clx-ansi-common-lisp))
(defmacro define-condition (name parent-types &body options)
  (let ((slot-names
	  (mapcar #'(lambda (slot) (if (consp slot) (car slot) slot))
		  (pop options)))
	(documentation nil)
	(conc-name (concatenate 'string (string name) "-"))	       
	(reporter nil))
    (dolist (item options)
      (ecase (first item)
	(:documentation (setq documentation (second item)))
	(:conc-name (setq conc-name (string (second item))))
	(:report (setq reporter (second item)))))
    `(within-definition (,name define-condition)
       (zl:defflavor ,name ,slot-names ,parent-types
	 :initable-instance-variables
	 #-Genera
	 (:accessor-prefix ,conc-name)
	 #+Genera
	 (:conc-name ,conc-name)
	 #-Genera
	 (:outside-accessible-instance-variables ,@slot-names)
	 #+Genera
	 (:readable-instance-variables ,@slot-names))
       ,(when reporter ;; when no reporter, parent's is inherited
	  `(zl:defmethod #-Genera (,name :report)
	                 #+Genera (dbg:report ,name) (stream)
	      ,(if (stringp reporter)
		   `(write-string ,reporter stream)
		 `(,reporter global:self stream))
	      global:self))
       (zl:compile-flavor-methods ,name)
       ,(when documentation
	  `(setf (documentation name 'type) ,documentation))
       ',name)))

#+(and lispm (not Genera) (not clx-ansi-common-lisp))
(zl:defflavor x-error () (global:error))

#+(and Genera (not clx-ansi-common-lisp))
(scl:defflavor x-error
	((dbg:proceed-types '(:continue))	;
	 continue-format-string)
	(sys:error)
  (:initable-instance-variables continue-format-string))

#+(and Genera (not clx-ansi-common-lisp))
(scl:defmethod (scl:make-instance x-error) (&rest ignore)
  (when (not (sys:variable-boundp continue-format-string))
    (setf dbg:proceed-types (remove :continue dbg:proceed-types))))

#+(and Genera (not clx-ansi-common-lisp))
(scl:defmethod (dbg:proceed x-error :continue) ()
  :continue)

#+(and Genera (not clx-ansi-common-lisp))
(sys:defmethod (dbg:document-proceed-type x-error :continue) (stream)
  (format stream continue-format-string))

#+(or clx-ansi-common-lisp excl lcl3.0 CMU sbcl)
(define-condition x-error (error) ())

#-(or lispm clx-ansi-common-lisp excl lcl3.0 CMU sbcl)
(defstruct x-error
  report-function)

#-(or lispm clx-ansi-common-lisp excl lcl3.0 CMU sbcl)
(defmacro define-condition (name parent-types &body options)
  ;; Define a structure that when printed displays an error message
  (flet ((reporter-for-condition (name)
	   (xintern "." name '-reporter.)))
    (let ((slot-names
	    (mapcar #'(lambda (slot) (if (consp slot) (car slot) slot))
		    (pop options)))
	  (documentation nil)
	  (conc-name (concatenate 'string (string name) "-"))	       
	  (reporter nil)
	  (condition (gensym))
	  (stream (gensym))
	  (report-function (reporter-for-condition name)))
      (dolist (item options)
	(ecase (first item)
	  (:documentation (setq documentation (second item)))
	  (:conc-name (setq conc-name (string (second item))))
	  (:report (setq reporter (second item)))))
      (unless reporter
	(setq report-function (reporter-for-condition (first parent-types))))
      `(within-definition (,name define-condition)
	 (defstruct (,name (:conc-name ,(intern conc-name))
		     (:print-function condition-print)
		     (:include ,(first parent-types)
		      (report-function ',report-function)))
	   ,@slot-names)
	 ,(when documentation
	    `(setf (documentation name 'type) ,documentation))
	 ,(when reporter
	    `(defun ,report-function (,condition ,stream)
	       ,(if (stringp reporter)
		    `(write-string ,reporter ,stream)
		  `(,reporter ,condition ,stream))
	       ,condition))
	 ',name))))

#-(or lispm clx-ansi-common-lisp excl lcl3.0 CMU sbcl)
(defun condition-print (condition stream depth)
  (declare (type x-error condition)
	   (type stream stream)
	   (ignore depth))
  (if *print-escape*
      (print-unreadable-object (condition stream :type t))
    (funcall (x-error-report-function condition) condition stream))
  condition)
  
#-(or lispm clx-ansi-common-lisp excl lcl3.0 CMU sbcl)
(defun make-condition (type &rest slot-initializations)
  (declare (dynamic-extent slot-initializations))
  (let ((make-function (intern (concatenate 'string (string 'make-) (string type))
			       (symbol-package type))))
    (apply make-function slot-initializations)))

#-(or clx-ansi-common-lisp excl lcl3.0 CMU sbcl)
(define-condition type-error (x-error)
  ((datum :reader type-error-datum :initarg :datum)
   (expected-type :reader type-error-expected-type :initarg :expected-type))
  (:report
    (lambda (condition stream)
      (format stream "~s isn't a ~a"
	      (type-error-datum condition)
	      (type-error-expected-type condition)))))


;;-----------------------------------------------------------------------------
;;  HOST hacking
;;-----------------------------------------------------------------------------

#-(or explorer Genera Minima Allegro CMU sbcl)
(defun host-address (host &optional (family :internet))
  ;; Return a list whose car is the family keyword (:internet :DECnet :Chaos)
  ;; and cdr is a list of network address bytes.
  (declare (type stringable host)
	   (type (or null (member :internet :decnet :chaos) card8) family))
  (declare (clx-values list))
  host family
  (error "HOST-ADDRESS not implemented yet."))

#+explorer
(defun host-address (host &optional (family :internet))
  ;; Return a list whose car is the family keyword (:internet :DECnet :Chaos)
  ;; and cdr is a list of network address bytes.
  (declare (type stringable host)
	   (type (or null (member :internet :decnet :chaos) card8) family))
  (declare (clx-values list))
  (ecase family
    ((:internet nil 0)
     (let ((addr (ip:get-ip-address host)))
       (unless addr (error "~s isn't an internet host name" host))
       (list :internet
	     (ldb (byte 8 24) addr)
	     (ldb (byte 8 16) addr)
	     (ldb (byte 8 8) addr)
	     (ldb (byte 8 0) addr))))
    ((:chaos 2)
     (let ((addr (first (chaos:chaos-addresses host))))
       (unless addr (error "~s isn't a chaos host name" host))
       (list :chaos
	     (ldb (byte 8 0) addr)
	     (ldb (byte 8 8) addr))))))

#+Genera
(defun host-address (host &optional (family :internet))
  ;; Return a list whose car is the family keyword (:internet :DECnet :Chaos)
  ;; and cdr is a list of network address bytes.
  (declare (type stringable host)
	   (type (or null (member :internet :decnet :chaos) card8) family))
  (declare (clx-values list))
  (setf host (string host))
  (let ((net-type (ecase family
		    ((:internet nil 0) :internet)
		    ((:DECnet 1) :dna)
		    ((:chaos 2) :chaos))))
    (dolist (addr
	      (sys:send (net:parse-host host) :network-addresses)
	      (error "~S isn't a valid ~(~A~) host name" host family))
      (let ((network (car addr))
	    (address (cadr addr)))
	(when (sys:send network :network-typep net-type)
	  (return (ecase family
		    ((:internet nil 0)
		     (multiple-value-bind (a b c d) (tcp:explode-internet-address address)
		       (list :internet a b c d)))
		    ((:DECnet 1)
		     (list :DECnet (ldb (byte 8 0) address) (ldb (byte 8 8) address)))
		    ((:chaos 2)
		     (list :chaos (ldb (byte 8 0) address) (ldb (byte 8 8) address))))))))))

#+Minima
(defun host-address (host &optional (family :internet))
  ;; Return a list whose car is the family keyword (:internet :DECnet :Chaos)
  ;; and cdr is a list of network address bytes.
  (declare (type stringable host)
	   (type (or null (member :internet :decnet :chaos) card8) family))
  (declare (clx-values list))
  (etypecase family
    ((:internet nil 0)
      (list* :internet
	     (multiple-value-list
	       (minima:ip-address-components (minima:parse-ip-address (string host))))))))

#+Allegro
(defun host-address (host &optional (family :internet))
  ;; Return a list whose car is the family keyword (:internet :DECnet :Chaos)
  ;; and cdr is a list of network address bytes.
  (declare (type stringable host)
	   (type (or null (member :internet :decnet :chaos) card8) family))
  (declare (clx-values list))
  (labels ((no-host-error ()
	     (error "Unknown host ~S" host))
	   (no-address-error ()
	     (error "Host ~S has no ~S address" host family)))
    (let ((hostent 0))
      (unwind-protect
	   (progn
	     (setf hostent (ipc::gethostbyname (string host)))
	     (when (zerop hostent)
	       (no-host-error))
	     (ecase family
	       ((:internet nil 0)
		(unless (= (ipc::hostent-addrtype hostent) 2)
		  (no-address-error))
		(assert (= (ipc::hostent-length hostent) 4))
		(let ((addr (ipc::hostent-addr hostent)))
		   (when (or (member comp::.target.
				     '(:hp :sgi4d :sony :dec3100)
				     :test #'eq)
			     (probe-file "/lib/ld.so"))
		     ;; BSD 4.3 based systems require an extra indirection
		     (setq addr (si:memref-int addr 0 0 :unsigned-long)))
		  (list :internet
			(si:memref-int addr 0 0 :unsigned-byte)
			(si:memref-int addr 1 0 :unsigned-byte)
			(si:memref-int addr 2 0 :unsigned-byte)
			(si:memref-int addr 3 0 :unsigned-byte))))))
	(ff:free-cstruct hostent)))))

;#+sbcl
;(require :sockets)

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