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;;; -*- Mode: LISP; Syntax: Common-lisp; Package: XLIB; Base: 10; Lowercase: Yes -*-
;;; This file contains definitions for the BUFFER object for Common-Lisp X
;;; windows version 11
;;;
;;; 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.
;;;
;; A few notes:
;;
;; 1. The BUFFER implements a two-way buffered byte / half-word
;; / word stream. Hooks are left for implementing this with a
;; shared memory buffer, or with effenciency hooks to the network
;; code.
;;
;; 2. The BUFFER object uses overlapping displaced arrays for
;; inserting and removing bytes half-words and words.
;;
;; 3. The BYTE component of these arrays is written to a STREAM
;; associated with the BUFFER. The stream has its own buffer.
;; This may be made more efficient by using the Zetalisp
;; :Send-Output-Buffer operation.
;;
;; 4. The BUFFER object is INCLUDED in the DISPLAY object.
;; This was done to reduce access time when sending requests,
;; while maintaing some code modularity.
;; Several buffer functions are duplicated (with-buffer,
;; buffer-force-output, close-buffer) to keep the naming
;; conventions consistent.
;;
;; 5. A nother layer of software is built on top of this for generating
;; both client and server interface routines, given a specification
;; of the protocol. (see the INTERFACE file)
;;
;; 6. Care is taken to leave the buffer pointer (buffer-bbuf) set to
;; a point after a complete request. This is to ensure that a partial
;; request won't be left after aborts (e.g. control-abort on a lispm).
(in-package :xlib)
(defconstant +requestsize+ 160) ;; Max request size (excluding variable length requests)
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;;; This is here instead of in bufmac so that with-display can be
;;; compiled without macros and bufmac being loaded.
(defmacro with-buffer ((buffer &key timeout inline)
&body body &environment env)
;; This macro is for use in a multi-process environment. It provides
;; exclusive access to the local buffer object for request generation and
;; reply processing.
`(macrolet ((with-buffer ((buffer &key timeout) &body body)
;; Speedup hack for lexically nested with-buffers
`(progn
(progn ,buffer ,@(and timeout `(,timeout)) nil)
,@body)))
,(if (and (null inline) (macroexpand '(use-closures) env))
`(flet ((.with-buffer-body. () ,@body))
#+clx-ansi-common-lisp
(declare (dynamic-extent #'.with-buffer-body.))
(with-buffer-function ,buffer ,timeout #'.with-buffer-body.))
(let ((buf (if (or (symbolp buffer) (constantp buffer))
buffer
'.buffer.)))
`(let (,@(unless (eq buf buffer) `((,buf ,buffer))))
,@(unless (eq buf buffer) `((declare (type buffer ,buf))))
,(declare-bufmac)
(when (buffer-dead ,buf)
(x-error 'closed-display :display ,buf))
(holding-lock ((buffer-lock ,buf) ,buf "CLX Display Lock"
,@(and timeout `(:timeout ,timeout)))
,@body))))))
(defun with-buffer-function (buffer timeout function)
(declare (type display buffer)
(type (or null number) timeout)
(type function function)
#+clx-ansi-common-lisp
(dynamic-extent function)
;; FIXME: This is probably more a bug in SBCL (logged as
;; bug #243)
(ignorable timeout)
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#+(and lispm (not clx-ansi-common-lisp))
(sys:downward-funarg function))
(with-buffer (buffer :timeout timeout :inline t)
(funcall function)))
;;; The following are here instead of in bufmac so that event-case can
;;; be compiled without macros and bufmac being loaded.
(defmacro read-card8 (byte-index)
`(aref-card8 buffer-bbuf (index+ buffer-boffset ,byte-index)))
(defmacro read-int8 (byte-index)
`(aref-int8 buffer-bbuf (index+ buffer-boffset ,byte-index)))
(defmacro read-card16 (byte-index)
#+clx-overlapping-arrays
`(aref-card16 buffer-wbuf (index+ buffer-woffset (index-ash ,byte-index -1)))
#-clx-overlapping-arrays
`(aref-card16 buffer-bbuf (index+ buffer-boffset ,byte-index)))
(defmacro read-int16 (byte-index)
#+clx-overlapping-arrays
`(aref-int16 buffer-wbuf (index+ buffer-woffset (index-ash ,byte-index -1)))
#-clx-overlapping-arrays
`(aref-int16 buffer-bbuf (index+ buffer-boffset ,byte-index)))
(defmacro read-card32 (byte-index)
#+clx-overlapping-arrays
`(aref-card32 buffer-lbuf (index+ buffer-loffset (index-ash ,byte-index -2)))
#-clx-overlapping-arrays
`(aref-card32 buffer-bbuf (index+ buffer-boffset ,byte-index)))
(defmacro read-int32 (byte-index)
#+clx-overlapping-arrays
`(aref-int32 buffer-lbuf (index+ buffer-loffset (index-ash ,byte-index -2)))
#-clx-overlapping-arrays
`(aref-int32 buffer-bbuf (index+ buffer-boffset ,byte-index)))
(defmacro read-card29 (byte-index)
#+clx-overlapping-arrays
`(aref-card29 buffer-lbuf (index+ buffer-loffset (index-ash ,byte-index -2)))
#-clx-overlapping-arrays
`(aref-card29 buffer-bbuf (index+ buffer-boffset ,byte-index)))
(defmacro event-code (reply-buffer)
;; The reply-buffer structure is used for events.
;; The size slot is used for the event code.
`(reply-size ,reply-buffer))
(defmacro reading-event ((event &rest options) &body body)
(declare (arglist (buffer &key sizes) &body body))
;; BODY may contain calls to (READ32 &optional index) etc.
;; These calls will read from the input buffer at byte
;; offset INDEX. If INDEX is not supplied, then the next
;; word, half-word or byte is returned.
`(with-buffer-input (,event ,@options) ,@body))
(defmacro with-buffer-input ((reply-buffer &key display (sizes '(8 16 32)) index)
&body body)
(unless (listp sizes) (setq sizes (list sizes)))
;; 160 is a special hack for client-message-events
(when (set-difference sizes '(0 8 16 32 160 256))
(error "Illegal sizes in ~a" sizes))
`(let ((%reply-buffer ,reply-buffer)
,@(and display `((%buffer ,display))))
(declare (type reply-buffer %reply-buffer)
,@(and display '((type display %buffer))))
,(declare-bufmac)
,@(and display '(%buffer))
(let* ((buffer-boffset (the array-index ,(or index 0)))
#-clx-overlapping-arrays
(buffer-bbuf (reply-ibuf8 %reply-buffer))
#+clx-overlapping-arrays
,@(append
(when (member 8 sizes)
`((buffer-bbuf (reply-ibuf8 %reply-buffer))))
(when (or (member 16 sizes) (member 160 sizes))
`((buffer-woffset (index-ash buffer-boffset -1))
(buffer-wbuf (reply-ibuf16 %reply-buffer))))
(when (member 32 sizes)
`((buffer-loffset (index-ash buffer-boffset -2))
(buffer-lbuf (reply-ibuf32 %reply-buffer))))))
(declare (type array-index buffer-boffset))
#-clx-overlapping-arrays
(declare (type buffer-bytes buffer-bbuf))
#+clx-overlapping-arrays
,@(append
(when (member 8 sizes)
'((declare (type buffer-bytes buffer-bbuf))))
(when (member 16 sizes)
'((declare (type array-index buffer-woffset))
(declare (type buffer-words buffer-wbuf))))
(when (member 32 sizes)
'((declare (type array-index buffer-loffset))
(declare (type buffer-longs buffer-lbuf)))))
buffer-boffset
#-clx-overlapping-arrays
buffer-bbuf
#+clx-overlapping-arrays
,@(append
(when (member 8 sizes) '(buffer-bbuf))
(when (member 16 sizes) '(buffer-woffset buffer-wbuf))
(when (member 32 sizes) '(buffer-loffset buffer-lbuf)))
#+clx-overlapping-arrays
(macrolet ((%buffer-sizes () ',sizes))
,@body)
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