TweetFollow Us on Twitter

Sep 85 Mousehole
Volume Number:1
Issue Number:10
Column Tag:Mousehole Letters

Mousehole Report, Letters

By Rusty Hodge, Sys Op & Contributing Editor, Mousehole BBS

Program bombs Lisp

MICRO GHOUL

I have been having a problem with a consistent bomb in ExperLisp that I was wondering whether anyone else was having. The following, though a terrible little routine is a perfect way to get to the bomb (which I was finally able to isolate trying to make a nice routine, that a later version of this piece of trash was working towards). Well, enough about that, here it is:

(SETQ MYWIND (NEWGRAFWINDOW '(100 100 300 350)))
(MYWIND 'SETWTITLE "GONNA BOMB!!")
(DEFUN COORDINATES ()
    (GETMOUSE))
(WHILE
    (NOT (BUTTON))
    (MYWIND 'SELECTWINDOW)
    (APPLY
         FILLOVAL '(50 50 (CAR (COORDINATES)) (CADR (COORDINATES)) MYWIND)))

Please excuse any typos or forgotten "(" or ")" or "'", if I forgot them here does not mean that I forgot them in the actual code, more important is the fact that though Lisp tries to give me an error it bombs with the ID #2 everytime. In fact the first time rather than just a bomb it added the desire to have a disk swap (though both disks where in their respective drives!)

Contest Winner

THE CATCHER

The Catcher (alias Steve Yaeger) wins the Mousehole printing contest sponsored by MacTutor, with this assembly entry to mimic the BASIC statement: PRINT "HELLO":END on the Macintosh. Steve wins a check for $50 and a MacTutor thank you. DON L also submitted an excellent answer that we will print next month.

; Print "hello" on the printer.
;       Written by Steve Yaeger
; If the printer is off-line, this will hang the Mac
;       until it is put back on line
; If there is no Printdriver file it just Beeps and exits
;
; The Linker file looks like this
;
;       HELLO.REL
;       ]
;
; These are the Equates Notice that the iPrReset, iPrLineFeed, 
; and  iPrPageEnd are Longwords and not words as in 
; PREQU.TXT from Counsulair.

 XREF START

; These are the PrDrvr constants.
 
iPrDrvrRef  EQU      $FFFD  ; Driver's RefNum = NOT ResID
iPrIOCtl       EQU      5              ; The Raw Byte IO Proc's ctl # 

PrDevCtl       EQU      7               ; The PrDevCtl Proc's ctl  # 

iPrReset       EQU      $00010000  ; The CParam for res
iPrPageEndEQU      $00020000  ; The CParam for end
iPrLineFeed EQU      $00030000   ; The CParam for pap 
lParam1 EQU      0                 ; the three printer parameters
lParam2 EQU      4
lParam3 EQU      8
 
; These are the standard call parameters
csCode  EQU      $1A      ;control dependent command 
csParam EQU      $1C             ;control dependent param.
ioCompletion  EQU     $C         ;pointer to async notifier routine
ioResult         EQU      $10      ;returns operation results
ioFileNameEQU      $12      ;pointer to name of driver
ioRefNum  EQU      $18      ;driver reference #
ioPermssn   EQU      $1B  ;read/write permission

; Traps used in this program
    .TRAP       _InitGraf                    $A86E
    .TRAP       _InitFonts                   $A8FE
    .TRAP       _FlushEvents       $A050
    .TRAP       _InitWindows       $A912
    .TRAP       _InitMenus                   $A930
    .TRAP       _InitDialogs                 $A97B
    .TRAP       _InitCursor                  $A850
    .TRAP       _TEInit                      $A9CC
    .TRAP       _Open                        $A000
    .TRAP       _Control                     $A004
    .TRAP       _SysBeep                     $A9C8
 
START
;Initialize Managers
PEA     -4(A5)            ;Space Created For Quickdraw's Use
_InitGraf                 ;Init Quickdraw
_InitFonts                ;Init the Font Manager
MOVE.L  #$0000FFFF,D0   ;This Mask Is For All Events
_FlushEvents              ;Flush All Of These Events
_InitWindows              ;Init the Window Manager
_InitMenus                ;Init the Menu Manager
CLR.L    -(SP)            ;restart procedure
_InitDialogs              ;Init the Dialog Manager
_InitCursor               ;Init to arrow cursor
_TEInit                   ;Init Text Edit
 
;------- OPEN THE PRINT DRIVER -------
LEA   '.Print',A1    ;Get a Pointer to the Drivers Name
LEA     IOPARMS,A0 ;Get the Parameter base addres
MOVE.L  A1,ioFileName(A0)     ;Store the Drivers Name addr
CLR.B    ioPermssn(A0)    ;fsCurPerm (whatever we got)
_OPEN
 LEA      IOPARMS,A0 ;Get the Parameter base address
 MOVE.W ioResult(A0),D0          ;Check for an error
 CMP.W  #0,D0                    ;is result ok?
 BEQ      @0                       ;Yes skip the error bell
 MOVE.W #30,-(SP)                ;beep length
 _SYSBEEP                          ;beep to indicate error
 BRA      @4

@0
;------ RESET THE PRINTER TO DEFAULTS -------
LEA     IOPARMS,A0               ;Get the Parameter base addr
MOVE.W  #iPrDevCtl,csCode(A0)   ;Set up a control type call
MOVE.L  #iPrReset,csParam+lParam1(A0)   ;only 1 (Reset)
CLR.L   csParam+lParam2(A0)
CLR.L   csParam+lParam3(A0)
_CONTROL
LEA     IOPARMS,A0 ;Get the Parameter base address
MOVE.W  ioResult(A0),D0   ;Check for an error
CMP.W   #0,D0                    ;is result ok?
 BEQ      @1                       ;Yes skip the error bell
 MOVE.W #30,-(SP)                ;beep length
 _SYSBEEP                          ;beep to indicate error
 BRA      @4
 
@1
;------ ACTUALLY PRINT THE WORD HELLO -------
LEATEXT_STRING,A1;Get address of string to pr
LEA     IOPARMS,A0 ;Get the Parameter base addres
MOVE.W  #iPrIOCtl,csCode(A0)  ;Set up a text streaming call
MOVE.L  A1,csParam+lParam1(A0)  ;Parameter one is a            
 ;pointer to the text
MOVE.L  #(TEXT_STRING_END-TEXT_STRING),                        csParam+lParam2(A0)
;Parameter two is the length of the text
CLR.L csParam+lParam3(A0)    ;No third Parameter
_CONTROL
 LEA      IOPARMS,A0         ;Get the Parameter base address
MOVE.W  ioResult(A0),D0   ;Check for an error
CMP.W   #0,D0                    ;is result ok?
BEQ     @2                         ;Yes skip the error bell MOVE.W
 #30,-(SP)                ;beep length
_SYSBEEP                           ;beep to indicate error
 BRA     @4

@2
;------ PRINT A CR+LF JUST FOR THE FUN OF IT --------
LEA   IOPARMS,A0            ;Get the Parameter base addres
MOVE.W  #iPrDevCtl,csCode(A0)   ;Set up a control type call
MOVE.L  #iPrLineFeed,csParam+lParam1(A0) 
 ;only 1? parameter (CR+LF)
CLR.L   csParam+lParam2(A0)     ;Parameter 2 undetermined
CLR.L    csParam+lParam3(A0)
_CONTROL
LEA     IOPARMS,A0         ;Get the Parameter base address
MOVE.W  ioResult(A0),D0          ;Check for an error
CMP.W   #0,D0                    ;is result ok?
BEQ     @3                         ;Yes skip the error bell
MOVE.W  #30,-(SP)                ;beep length
_SYSBEEP                           ;beep to indicate error
BRA     @4

@3
;---- EJECT A PAGE SO THAT WE CAN SEE WHAT HAPPENS
LEA     IOPARMS,A0          ;Get the Parameter base address
MOVE.W  #iPrDevCtl,csCode(A0)   ;Set up a control type call
MOVE.L  #iPrPageEnd,csParam+lParam1(A0) 
 ;only 1 parameter (eject)
CLR.L   csParam+lParam2(A0)
CLR.L   csParam+lParam3(A0)
_CONTROL
LEA     IOPARMS,A0          ;Get the Parameter base address
MOVE.W  ioResult(A0),D0          ;Check for an error
CMP.W   #0,D0                    ;is result ok?
 BEQ.S    @4                       ;Yes skip the error bell
 MOVE.W  #30,-(SP)                 ;beep length
_SYSBEEP                           ;beep to indicate error
@4
 RTS
 ;        Data Structures
TEXT_STRING      DC.B    'HELLO'
TEXT_STRING_END
.ALIGN  2
 
IOPARMS          DCB.L    20,0
; ------------------   end of program -------------------------------

Letters

First off, I want you to know that I really enjoy reading MacTutor, especially the articles on assembly language. Second I want to report a slight error on page 37 of the June issue. In figure 1 of that issue, a Pascal string is shown as 'fName: String[63]' with it's assembly equivalent as 'DCB.B 63,0'. This could be very misleading. A pascal string is always preceded by a one byte length byte. Thus STR[63] is rendered by DCB.B 64,0. Since using this structure as it was shown could cause an odd alignment of the next data structure, watch out for the 'ole length byte. It could be a difficult bug to track down! Thanks again for an interesting and informative publication.

Made my Day with Modula-2

Terri Wiles, President

Compu-Craft

Thank you for "making my day". We have just recieved the back issues we ordered. It is utterly exciting to see so many articles of substance, especially after months of searching through the pages and pages of the fluff of which certain other Mac magazines are comprised. It is particularly encouraging to me to see articles about Modula-2. I certainly want to express my most sincere hope that this will become a regular column, with particular emphasess on the task of interfacing with the Macintosh.

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

How to become the ultimate robot warrior...
Chrono Strike is a delightfully immersive beat ‘em up with a sense of humor (any game with a good Sims reference gets points in my book). [Read more] | Read more »
Tips and tricks to get a higher score in...
Snow Roll is a devilish endless runner very much in the vein of Flappy Bird. It revels in its dastardly level of difficulty, and doesn’t really care how angry you get at it as it knows you’ll keep coming back for more. [Read more] | Read more »
How to win big in Slots Deluxe
Cheating while gambling is illegal and morally wrong, and in some parts of the world it leads to men with names like Vinnie "Six Knuckles" Manchenzo beating you to a pulp in a dark alley. [Read more] | Read more »
How to take over the world in Dictator 2
Running a country isn't easy - especially when you're a dictator who wants to take over the world and crush everyone in your path while you do it. [Read more] | Read more »
Tips and tricks to get a higher score in...
Tank.iois - you guessed it! - another multiplayer arena battler likeAgar.io and Slither.io. It does differentiate itself by putting you in a tiny tank though, so it's not exactly the same. To help you get that all-important high score, we've got a... | Read more »
How to unlock characters in One Tap Tenn...
As the title suggests, One Tap Tennis requires only a single tap to play its particular brand of tennis, and rewards you with a ton of unlockable characters if you perform well. Fortunately for you, we at 148Apps have got a few tips and tricks to... | Read more »
Grab it now: Game Craft’s Legend of War...
The real time strategy game is now available for you to sink your teeth into, through the App Store and Google Play. Combining elements of skill, strategy and empire building, Legend of War is a real gamers’ game. [Read more] | Read more »
Skateboard Party 3 ft. Greg Lutzka (Gam...
Skateboard Party 3 ft. Greg Lutzka 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: Skateboard Party is back! This third edition of the popular sports franchise features professional skater... | Read more »
Cubious (Games)
Cubious 1.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0 (iTunes) Description: Cubious – How smart are you? How high is your IQube? Solve the impossible puzzles to find out, and help a lost little cube find his... | Read more »
Goat Simulator Waste of Space (Games)
Goat Simulator Waste of Space 1.1 Device: iOS Universal Category: Games Price: $4.99, Version: 1.1 (iTunes) Description: ** IMPORTANT - SUPPORTED DEVICESiPhone 4S, iPad 2, iPod Touch 5 or better.** | Read more »

Price Scanner via MacPrices.net

Enterprise Workers Pick Technology Over Perks...
New Adobe study shows surprising attitudes about office jobs and where the future of work is heading. Adobe has released survey findings revealing that a surprising 70 percent of U.S. office workers... Read more
Memorial Day Weekend Sale: $50-$100 off 11-in...
B&H Photo has 13″ and 11″ MacBook Airs with 256GB SSDs on sale for $50-$100 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 11″ 1.6GHz/256GB MacBook Air: $999 $100 off MSRP... Read more
Memorial Day Weekend Sales: Apple MacBook Pro...
B&H Photo has 13″ and 15″ Retina MacBook Pros on sale for up to $210 off MSRP. Shipping is free, and B&H charges NY tax only: - 15″ 2.2GHz Retina MacBook Pro: $1799 $200 off MSRP - 15″ 2.5GHz... Read more
Memorial Day Weekend Sales: Apple iMacs and M...
Take up to $150 off the price of a new iMac or Mac mini at the following Apple resellers this Memorial Day weekend: iMacs: B&H Photo has 21″ and 27″ iMacs on sale for up to $150 off MSRP... Read more
Apple refurbished Retina MacBook Pros availab...
Apple has Certified Refurbished 2015 13″ and 15″ Retina MacBook Pros available for up to $380 off the cost of new models. An Apple one-year warranty is included with each model, and shipping is free... Read more
Apple refurbished 11-inch MacBook Airs availa...
Apple has Certified Refurbished 11″ MacBook Airs (the latest models), available for up to $170 off the cost of new models. An Apple one-year warranty is included with each MacBook, and shipping is... Read more
Goal Zero and OtterBox Partner to Expand iPh...
Goal Zero, specialists in portable power, have announced a partnership with OtterBox, brand smartphone case protection, to offer the Slide and Slide Plus Batteries as modules compatible with the new... Read more
15-inch Retina MacBook Pros on sale for up to...
B&H Photo has 15″ Retina MacBook Pros on sale for up to $210 off MSRP. Shipping is free, and B&H charges NY tax only: - 15″ 2.2GHz Retina MacBook Pro: $1799 $200 off MSRP - 15″ 2.5GHz Retina... Read more
Clearance 2015 13-inch MacBook Airs available...
B&H Photo has clearance 2015 13″ MacBook Airs available for $250 off original MSRP. Shipping is free, and B&H charges NY sales tax only: - 13″ 1.6GHz/4GB/128GB MacBook Air (MJVE2LL/A): $799... Read more
Apple refurbished Apple TVs available for up...
Apple has Certified Refurbished 32GB and 64GB Apple TVs available for up to $30 off the cost of new models. Apple’s standard one-year warranty is included with each model, and shipping is free: -... Read more

Jobs Board

*Apple* Solutions Consultant - APPLE (United...
Job Summary As an Apple Solutions Consultant, you'll be the link between our future customers and our products. You'll showcase your entrepreneurial spirit as you Read more
*Apple* Project Engineer - Smart Source Inc...
SmartSource is in need of an Apple Project Engineer for a 12 month contract opportunity in Pittsburg, PA. Role: Apple Project Engineer Location: Pittsburg, PA Read more
Automotive Sales Consultant - Apple Ford Linc...
…you. The best candidates are smart, technologically savvy and are customer focused. Apple Ford Lincoln Apple Valley is different, because: $30,000 annual salary Read more
Service Assistant - *Apple* Chevrolet *App...
Apple Automotive is one of the fastest growing dealer...and it shows. Consider making the switch to the Apple Automotive Group today! At Apple Automotive, we Read more
Editor, *Apple* News - APPLE (United States...
Job Summary The Apple News team is looking for a passionate and knowledgeable editor with experience covering entertainment/pop culture and experience running social Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.