;;; -*- Mode: Common-Lisp; Package: SYS; Base: 10.; Patch-File: T -*-

;;; Reason: Modified setprop to make sure the user is not attempting to modified the constants NIL or T. [10707]

;;;                           RESTRICTED RIGHTS LEGEND
;;;
;;; Use, duplication, or disclosure by the Government is subject to
;;; restrictions as set forth in subdivision (c)(1)(ii) of the Rights in
;;; Technical Data and Computer Software clause at 52.227-7013.
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;;;   TEXAS INSTRUMENTS INCORPORATED      
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;;; Copyright (C) 1989 Texas Instruments Incorporated.
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;;; Written 06/11/90 09:34:02 by BERGER,
;;; while running on ARIES from band LODX
;;; With SYSTEM 6.38, VIRTUAL-MEMORY 6.3, EH 6.8, MAKE-SYSTEM 6.3, MICRONET 6.0, LOCAL-FILE 6.2,
;;;  BASIC-PATHNAME 6.5, NETWORK-SUPPORT-COLD 6.2, BASIC-NAMESPACE 6.8, NETWORK-NAMESPACE 6.1,
;;;  DISK-IO 6.3, DISK-LABEL 6.1, BASIC-FILE 6.13, MAC-PATHNAME 6.0, NETWORK-PATHNAME 6.2,
;;;  COMPILER 6.18, TV 6.26, DATALINK 6.0, CHAOSNET 6.8, GC 6.4, MEMORY-AUX 6.0, NVRAM 6.3,
;;;  SYSLOG 6.2, STREAMER-TAPE 6.6, UCL 6.0, INPUT-EDITOR 6.0, METER 6.2, ZWEI 6.21,
;;;  DEBUG-TOOLS 6.5, NETWORK-SUPPORT 6.1, NETWORK-SERVICE 6.3, DATALINK-DISPLAYS 6.0,
;;;  FONT-EDITOR 6.1, SERIAL 6.0, PRINTER 6.7, MAC-PRINTER-TYPES 6.2, PRINTER-TYPES 6.2,
;;;  IMAGEN 6.1, SUGGESTIONS 6.1, MAIL-DAEMON 6.6, MAIL-READER 6.8, TELNET 6.1, VT100 6.0,
;;;  NAMESPACE-EDITOR 6.6, PROFILE 6.3, VISIDOC 6.7, TI-CLOS 6.51, CLEH 6.5, IP 3.65,
;;;  Experimental CLX 6.11, CLUE 6.105, X11M 6.30, Experimental BUG 11.19, VISIDOC-SERVER 6.2,
;;;   microcode 483, Band Name: 6.1-A 5-31 +P6/4

#!C
; From file SYMBOLS.LISP#> KERNEL; Hotel:
#10R SYSTEM#:
(COMPILER-LET ((*PACKAGE* (FIND-PACKAGE "SYSTEM"))
                          (SI:*LISP-MODE* :COMMON-LISP)
                          (*READTABLE* COMMON-LISP-READTABLE)
                          (SI:*READER-SYMBOL-SUBSTITUTIONS* *COMMON-LISP-SYMBOL-SUBSTITUTIONS*))
  (COMPILER#:PATCH-SOURCE-FILE "SYS: KERNEL; SYMBOLS.#"


(defun setprop (symbol-or-plist property value)
  (etypecase symbol-or-plist
    (instance (send symbol-or-plist :putprop value property))
    ((or symbol locative cons) 
     (without-interrupts
       (let* ((plist-loc (if (symbolp symbol-or-plist) 
			     (property-cell-location symbol-or-plist) 
			     symbol-or-plist))
	      (valloc (get-location-or-nil plist-loc property)))  ;; a locative to (old-value ...)
	 ;;DAB 06-11-90 Don't allow the constants T and NIL to be modified. [10707]
	 (when (locativep plist-loc)
	   (cond ((eq plist-loc  (locf nil))
		  (ferror nil "attempting to SETQ the CONSTANT NIL"))
		 ((eq plist-loc  (locf T))
		  (ferror nil "attempting to SETQ the CONSTANT T"))))
	 (if valloc (rplaca valloc value)   ;; if there is already a property, replace its value
	     (rplacd plist-loc              ;; else push a new property and value
		     (list*-in-area 
		       (if (= (%area-number symbol-or-plist) nr-sym)
			   property-list-area
			   background-cons-area)
		       property value (contents plist-loc))))
	 value)))))
))