[comp.sources.amiga] v91i056: NoDelete 1.4 - intercept DeleteFile

amiga-request@ab20.larc.nasa.gov (Amiga Sources/Binaries Moderator) (03/14/91)

Submitted-by: hoover@math4.uni-bielefeld.de (Uwe Sch"urkamp)
Posting-number: Volume 91, Issue 056
Archive-name: utilities/nodelete-1.4/part01

[ includes uuencoded executable  ...tad ]

I  wrote  this  program  mainly  to  make  the fantastic public domain game
"Omega"  more  enjoyable  to  play.   The author of this program thought it
reasonable to have the system unlink the save-file after having reloaded it
to  somehow  "simulate the continuity of character".  Too bad that NoDelete
does not work correctly with this program...
Footnote: It works now!

                              WHAT IT DOES
NoDelete  enables  you  erraneous  humans  to  once  again  reflect  on the
righteousness  of  your  decisions  concerning  the  deleting  of  files on
AmigaDos devices.  If you try to delete a file or a program tries to remove
it,  this  is  mostly  done  via  DeleteFile()  of  the  dos.library.  When
executed,  NoDelete  bends  this  vector to its own routine which brings up
this  cute  little requester on the active window.  This requester contains
the  name  of  the file that the system is trying to delete.  If you really
want  to  delete  this  file,  click to the "Yes, Delete!" gadget.  If not,
click  to the "Oops, no way!"-Gadget of the requester.  NoDelete works just
fine   with   aliases,   wildcards   etc.   For  problems  see  the  "known
bugs"-section of this text.

#!/bin/sh
# This is a shell archive.  Remove anything before this line, then unpack
# it by saving it into a file and typing "sh file".  To overwrite existing
# files, type "sh file -c".  You can also feed this as standard input via
# unshar, or by typing "sh <file", e.g..  If this archive is complete, you
# will see the following message at the end:
#		"End of archive 1 (of 1)."
# Contents:  nodelete.c nodelete.doc nodelete.uu
# Wrapped by tadguy@ab20 on Wed Mar 13 19:39:55 1991
PATH=/bin:/usr/bin:/usr/ucb ; export PATH
if test -f 'nodelete.c' -a "${1}" != "-c" ; then 
  echo shar: Will not clobber existing file \"'nodelete.c'\"
else
echo shar: Extracting \"'nodelete.c'\" \(6661 characters\)
sed "s/^X//" >'nodelete.c' <<'END_OF_FILE'
X/* NoDelete V1.4E (C) HooverSoft 1990
X
X	cc NoDelete +L
X	ln NoDelete -lc32
X
X
X*/
X
X
X#ifdef AZTEC_C					/* Works under Manx, convert it to Lattice */
X									/* if you don't mind the hassle...			 */
X
X#include<intuition/intuition.h>
X#include<intuition/intuitionbase.h>
X#include<libraries/dos.h>
X#include<libraries/dosextens.h>
X#include<stdio.h>
X/* #define DEBUG 1 */
X
Xchar bodystring[80],extensions[10][10], titlebak[80], title[80];
XULONG answer, EXT_SET = 0L,  howmany = 0L;
XUBYTE *position, *rindex();
XULONG OVERRIDE = 0L, SILENT = 0L;
X
Xstruct FileHandle *output, *Output();
X
Xstruct NewWindow mywindow = {
X	100,0,	/* window XY origin relative to TopLeft of screen */
X	350,10,	/* window width and height */
X	0,1,	/* detail and block pens */
X	CLOSEWINDOW+VANILLAKEY,	/* IDCMP flags */
X	WINDOWDRAG+WINDOWDEPTH+WINDOWCLOSE+SIMPLE_REFRESH,	/* other window flags */
X	NULL,	/* first gadget in gadget list */
X	NULL,	/* custom CHECKMARK imagery */
X	(UBYTE *)title,	/* window title */
X	NULL,	/* custom screen pointer */
X	NULL,	/* custom bitmap */
X	5,5,	/* minimum width and height */
X	640,110, /* maximum width and height */
X	WBENCHSCREEN	/* destination screen type */
X	};
X
X
Xstruct IntuiText body = {
X	1,0,
X	JAM1|COMPLEMENT,
X	30,16,
X	NULL,
X	NULL,
X	NULL
X	};
X
Xstruct IntuiText fbody = {
X	1,0,
X	JAM1|COMPLEMENT,
X	30,5,
X	NULL,
X	(UBYTE *) "System tries to fool around...",
X	&body
X	};
X
Xstruct IntuiText ok = {
X	1,0,
X	JAM1|COMPLEMENT,
X	6,3,
X	NULL,
X	(UBYTE *)	"Yes, Delete!",
X	NULL
X	};
X
Xstruct IntuiText no = {
X	1,0,
X	JAM1|COMPLEMENT,
X	6,3,
X	NULL,
X	(UBYTE *)  "Oops, No Way!",
X	NULL
X	};
X
X
Xstruct IntuiMessage *msg, *GetMsg();
X
Xstruct IntuitionBase *IntuitionBase;
Xstruct Window			*mw, *aw, *OpenWindow();
Xstruct Library			*DosBase;
XUBYTE						*filename;
Xvoid 						*OpenLibrary();
Xstruct Task				*FindTask();
X
Xvoid NoDelete()
X{
X#asm
X	public	_LVOSetProtection
X
X	movem.l	d0-d7/a0-a6,-(sp)
X#endasm
X	geta4();
X#asm
X	move.l	d1,_filename
X#endasm
X
X	if(EXT_SET)
X		{
X
X		position = rindex(filename, '.');
X		if(!position)
X			goto delete_anyway;
X		else
X			{
X			for(answer=0L; answer < howmany; answer++)			
X				{
X				if( (strcmp( (UBYTE *) position, (UBYTE *) extensions[answer])) != 0L)
X					continue;
X				else
X					goto request;
X				}
X			}
X		goto delete_anyway;		
X		}	
Xrequest:
X	strcpy(bodystring, "Delete File `");
X	strcat(bodystring, (char *)filename);
X	strcat(bodystring, "'?");
X	body.IText = (UBYTE *) bodystring;
X	aw = (struct Window *) IntuitionBase->ActiveWindow;
X	answer = (long)AutoRequest(aw, &fbody, &ok, &no, NULL, NULL, 360L, 61L);
X	if(!answer)
X	{
X		;
X#asm
X	movem.l	(sp)+,d0-d7/a0-a6
X	move.l	#1,d0
X#endasm
X	return;
X	}
X
X	if(answer)
X	{
X
Xdelete_anyway:
X		;
X#asm
X
X		move.l	_DosBase,a6		
X		move.l	#$70f7,d0			;restore old vector
X		move.w	d0,-72(a6)
X		move.l	#$60000092,d0
X		move.l	d0,-70(a6)
X		
X		tst.l		_OVERRIDE
X		beq.s		_dont_unprotect
X
X		move.l	_filename,d1
X
X
X		move.l	#0,d2
X		jsr		_LVOSetProtection(a6)
X
X_dont_unprotect:
X
X		move.l	_filename,d1
X		jsr		-72(a6)				;DeleteFile() call
X#endasm
X
X		;
X
X		SetFunction(DosBase, -72L, &NoDelete);
X
X/* install our function */
X
X
X#asm
X		movem.l	(sp)+,d0-d7/a0-a6
X		move.l	#1,d0
X#endasm
X		return;
X		}
X	}
X		
X
Xvoid quit(why)
XUBYTE *why;
X{
X	if(!SILENT)
X		Write(output, why, (ULONG) strlen(why) );
X	SetTaskPri((struct Task *)FindTask(0L), 0L);
X	if(DosBase)
X	{
X		;
X#asm
X		move.l	_DosBase,a6		
X		move.l	#$70f7,d0			;restore old vector
X		move.w	d0,-72(a6)
X		move.l	#$60000092,d0
X		move.l	d0,-70(a6)
X#endasm
X		;
X	}
X
X	if	(mw)
X		CloseWindow(mw);
X
X	if (DosBase)	
X		CloseLibrary(DosBase);
X
X	if (IntuitionBase)
X		CloseLibrary(IntuitionBase);
X
X	exit(0L);
X}
X
X/* test_nd() tests the DeleteFile vector to see if NoDelete is already 
X	installed. Returns zero if NoDelete is installed, one if it is not.
X*/
X#asm
X		public	_test_nd
X_test_nd:
X
X		move.l	_DosBase,a6
X		cmpi.l	#$60000092,-70(a6)
X		bne.s		_is_there				
X		moveq		#1,d0
X		bra.s		_fuckoff
X_is_there:
X		moveq		#0,d0
X_fuckoff:
X		rts	
X#endasm
Xvoid main(argc,argv)
Xlong argc;
Xchar *argv[];
X	{
X
X	static UBYTE *msg1 = (UBYTE *)"Installing NoDelete...";
X	static UBYTE *msg2 = (UBYTE *)"done. NoDelete V1.4E (c) HooverSoft 1990\n\n";
X	long i;
X
X	DosBase = (struct Library *) OpenLibrary("dos.library",0L);
X	output = Output();
X	strcpy(title, (UBYTE *) "NoDelete V1.4E (c) HooverSoft");
X	
X	if(argc > 11)
X		quit("Sorry, only 10 extensions allowed!\n");
X
X	if(argc >= 2)
X		{
X		for(i=1; i<argc; i++)
X			{
X	
X			if(argv[i][0] == '.')
X				{
X				EXT_SET = 1L;
X				strcpy(extensions[howmany], argv[i]);
X				howmany++;
X				}
X			else
X			 continue;
X
X#ifdef	DEBUG
X			printf("Copied %s, Result: %s\n", argv[i], extensions[i-1L]);
X#endif	
X			}
X
X#ifdef	DEBUG
X		printf("I found %ld extensions.\n", howmany);
X#endif			
X
X
X		if(howmany)
X				strcat(title, (UBYTE *) " EXT SET");			
X
X		for(i=1; i<argc; i++)
X			{
X#ifdef DEBUG
X			printf("Scanning argv[%ld]: %s\n", i, (UBYTE *) argv[i] );
X#endif
X			if( (char) argv[i][0] == '-')
X				switch( (char) argv[i][1] )
X					{
X					case 'y':	if( atoi(argv[i+1]) <= 245L)
X										mywindow.TopEdge = atoi(argv[i+1]);
X 									break;
X
X					case 'p':	if(atoi(argv[i+1]) < 10L && atoi(argv[i+1]) > -20L)
X										SetTaskPri((struct Task *)FindTask(0L),\
X														(long)atoi(argv[i+1]));
X									else
X										SetTaskPri((struct Task *)FindTask(0L), -5L);
X									break;
X
X					case  'O':	OVERRIDE = 1L;
X									break;
X				
X					case  'S':	SILENT = 1L;
X									break;
X				
X					case default: break;
X					}
X				/* end switch */
X			/*end if */
X		/*end for */
X			}	
X					
X		}
X
X	if(!howmany)
X		{
X		EXT_SET = 0L;
X		strcat(title, (UBYTE *) " NO EXT");
X		}
X
X/* calculate dimension of TitleBar */
X
X	mywindow.Width = ( strlen(title) * 8L) + 85L;
X	mywindow.LeftEdge = (640L-mywindow.Width) / 2L;
X
X	IntuitionBase =  OpenLibrary("intuition.library",0L);
X	if(!SILENT)
X		Write(output, msg1, (ULONG)strlen(msg1));
X
X	if( !test_nd() && !SILENT )
X		{
X		Write(output, "NoDelete already installed.\n",28L);
X		CloseLibrary(DosBase);
X		CloseLibrary(IntuitionBase);
X		exit(0L);
X		}
X
X	mw = OpenWindow(&mywindow);
X	if(!mw)
X		quit("Could not open Window.\n\n");
X	if(!SILENT)
X		Write(output, msg2, (ULONG)strlen(msg2));
X
X	SetFunction(DosBase, -72L, &NoDelete); 
X
X	for(;;)
X		{
X		Wait(1L << mw->UserPort->mp_SigBit);
Xgetmsg:
X		msg = GetMsg(mw->UserPort);
X		ReplyMsg(msg);
X		if (msg->Class == CLOSEWINDOW)
X			quit("NoDelete V1.4E exiting.\n\n");
X		if(msg->Class == VANILLAKEY)
X			{
X			strcpy(titlebak, (UBYTE *) "Extensions: ");
X			for(i=0L; i < howmany ; i++)
X				{
X				strcat(titlebak, extensions[i]);
X				strcat(titlebak, " ");
X				}
X			SetWindowTitles(mw, titlebak);
X			Wait(1L << mw->UserPort->mp_SigBit);
X			SetWindowTitles(mw, title);
X			ReplyMsg( GetMsg(mw->UserPort) );
X			}
X
X		else
X			continue;
X		}
X	}
X#endif	
X	
END_OF_FILE
if test 6661 -ne `wc -c <'nodelete.c'`; then
    echo shar: \"'nodelete.c'\" unpacked with wrong size!
fi
# end of 'nodelete.c'
fi
if test -f 'nodelete.doc' -a "${1}" != "-c" ; then 
  echo shar: Will not clobber existing file \"'nodelete.doc'\"
else
echo shar: Extracting \"'nodelete.doc'\" \(8113 characters\)
sed "s/^X//" >'nodelete.doc' <<'END_OF_FILE'
X *************************************************************************
X *              NoDelete V1.4  (C) HooverSoft  Oct 30th, 1990            *
X *************************************************************************
X
XUSAGE:	1> run NoDelete [extensions] [-p priority] [-y ypos] <ENTER>
X			from CLI only.
X
X
X
X
X                                  HISTORY
X
X                     CHANGES TO VERSION 1.35: OCT 1990
XProgrammed  two  new options -O and -S (Cheers, John!).  These options sort
Xof  "fix"  a  bug whith NoDelete which used to override the file protection
Xbit.
X
X                     CHANGES TO VERSION 1.3: SEP 1990
XLots  of  changes.   Thinking  of  writing  a  new  documentation.  Anyway,
Xintroduced  command line options -p and -y for run-time setting of priority
Xof NoDelete and of vertical position of titlebar.
X
X                     CHANGES TO VERSION 1.2: AUG 1990
XIntroduced  the  possibilty  to give multiple extensions on startup.  Lists
Xextensions when pressing a key while Nodelete's titlebar is active.
X
X                     CHANGES TO VERSION 1.1: Aug 1990
XNoDelete now automatically centers the Dragbar on Screen and calculates the
Xcorrect width for the window if a extension is specified.
X
XNow  works  fine  with  AmiOmega.   System won't crash if "Yes, Delete!" is
Xselected.
X
XNow  supports  the  use of extensions to ask confirmations only for special
Xfiles  ending  in  defined  extension.  Will show the selected extension in
Xwindow's titlebar.
X
XNoDelete  now  checks  if  another  NoDelete is already active and exits if
Xtrue.
X
X                     CHANGES TO VERSION 1.01: Jul 1990
XNow handles protected Files correctly.  Previous version didn't complain if
Xfile was delete protected.
X
XNoDelete sets its priority to a value of -5 directly after startup.
X
X                    CHANGES TO VERSION 1.00: June 1990
XVersion  1.01  now  restores  the  Dos Vector relative to _DosBase, so this
Xprogram  should  work under Kickstart 1.3 as well.  If someone already uses
XKick 2.0, he or she should let me know if NoDelete works with that.  I have
Xheard  that  the  funny  instructions  in DosBase have been replaced with a
Xregular jump table.
X
X
X                           WHY USE NODELETE?
XI  wrote  this  program  mainly  to  make  the fantastic public domain game
X"Omega"  more  enjoyable  to  play.   The author of this program thought it
Xreasonable to have the system unlink the save-file after having reloaded it
Xto  somehow  "simulate the continuity of character".  Too bad that NoDelete
Xdoes not work correctly with this program...
XFootnote: It works now!
X
X                              WHAT IT DOES
XNoDelete  enables  you  erraneous  humans  to  once  again  reflect  on the
Xrighteousness  of  your  decisions  concerning  the  deleting  of  files on
XAmigaDos devices.  If you try to delete a file or a program tries to remove
Xit,  this  is  mostly  done  via  DeleteFile()  of  the  dos.library.  When
Xexecuted,  NoDelete  bends  this  vector to its own routine which brings up
Xthis  cute  little requester on the active window.  This requester contains
Xthe  name  of  the file that the system is trying to delete.  If you really
Xwant  to  delete  this  file,  click to the "Yes, Delete!" gadget.  If not,
Xclick  to the "Oops, no way!"-Gadget of the requester.  NoDelete works just
Xfine   with   aliases,   wildcards   etc.   For  problems  see  the  "known
Xbugs"-section of this text.
X
X                                EXTENSIONS
XLots  of  programs,  programmers  and normal people use extensions in their
Xfile system to be able to immediately make out the contents of a file.  For
Xexample,  ".c"  specifies  the file to be a C source code and ".bas" should
Xcontain  a  basic  program's  source.   There  are  tons of frequently used
Xextensions,  from  ".asm"  up to ".cfg".  If you use NoDelete and you don't
Xwant  the  system to get on your nerves by confirming EVERY rm command, you
Xshould  use a certain extension on NoDelete's command line to tell NoDelete
Xthat  it  should  only  ask  confirmation for those precious ".c" or ".iff"
Xfiles and let all others alone.
X
XThe command line
X
X		1> run nodelete .c
X
Xwould  tell NoDelete to only intercept the removing of files ending in ".c"
Xand not to worry about any other files that are removed from the device.
X
XYou can specifiy up to ten extensions when running NoDelete. The command
X
X		1> run NoDelete .c .iff .tex .asm
X
Xwill  make  NoDelete  complain  about  any  file  which  ends in one of the
Xspecified  extensions  and  leave  all others alone.  If you have forgotten
Xwhich  extensions  you  specified  at  startup,  just  activate  NoDelete's
Xtitlebar  and  press any key.  NoDelete will then give a list of extensions
Xin the titlebar until another key is pressed.
X
X
X
X                           COMMAND LINE OPTIONS
XFinally,  HooverSoft  is  proud  to have introduced command line options in
XNoDelete.  So far, four options are supported:
X
X-p	number	where number is an integer between -20 and 9. If given on
X				the command line, NoDelete will set its priority to this
X				value.  If you type rubbish or use values not allowed, the
X				default priority of -5 is set.
X
X-y ypos		where ypos is an integer ranging from zero to 245 (sorry,
X				all you NTSC users...).  This number will determine the ver-
X				tical position of NoDelete's titlebar.  if you try to fool
X				NoDelete or do not give this option, the default value zero
X				(top of screen) is used.
X
X-O				Override file protection bit. If this option is given,
X				NoDelete will NOT care about the file's protection status.
X				This option is sort of dangerous, but I think I you are
X				explicitly asked wether you want to delete a file this
X				should be presto! wiped off the disk without return or
X				any other chance of survival..., Anyway, the default now
X				is to consider and respect the file protection.
X
X-S				if given, this option tells NoDelete to shut up. No screams,
X				no comments!
X
X                               KNOWN BUGS
XNoDelete  cannot  take  care of the AmigaDos command Delete.  God knows how
Xthis command erases a disk file...
X
XThe  Shell  won't complain if you try to delete any non-existent file while
XNoDelete  has  its  grip  on  the system.  This is not really a bug because
XNoDelete  works  on  this  basis  of  cheating  the  calling  function  and
Xpretending that everything is just fine and deleted. This also is the cause
Xthat the calling program will not be informed if the file in question
Xis delete protected.
X
XSometimes  it is possible to get two copies of NoDelete running at the same
Xtime.   I  can't  explain  how  this is to be done, but somehow it works...
XAnyway this happens very seldomly.
X
X                            THE LEGAL STUFF
XNoDelete  is  Public Domain and may be copied freely by everyone except for
Xpurposes  listed below as long as this notice is left intact.  This program
Xis  copyright  (C)  by  HooverSoft.   It  may  NOT  be  copied  or sold for
Xcommercial  purposes  without  written  permssion  by the author (Get lost,
XCarsten Wolf and all you other suckers!).  It may be distributed and copied
Xfreely for non-commercial purposes only.
X
XWhen  distributed,  this program should always be accompanied by this file,
Xthe documentation.
X
X                    FURTHER PLANS & HOPELESS DREAMS
XI  would  like  to use CreateTask() to launch a separate Task for Nodelete.
XThis would unlink NoDelete's memory requirements from the current stacksize
Xof  the  system.  It would be nice if "delete" could also be disabled but I
Xam not sure how to do this.
X
X                            PUBLIC FEEDBACK
XBug  reports  (cheers, Jensi & John!), criticism, comments and approvements
Xshould be sent to
X						
X				SNAIL:
X                              HooverSoft Inc.
X                            Joellenbecker Weg 4
X                               4900 Herford
X
X				BITNET:			
X                          hoover@math4.uni-bielefeld.de
X
X                                DISCLAIMER
XDo  whatever you like with this program, but listen:  you can't blaim it on
Xme if anything goes down the drain! 
X
XHave fun & God bless you, Hoover
END_OF_FILE
if test 8113 -ne `wc -c <'nodelete.doc'`; then
    echo shar: \"'nodelete.doc'\" unpacked with wrong size!
fi
# end of 'nodelete.doc'
fi
if test -f 'nodelete.uu' -a "${1}" != "-c" ; then 
  echo shar: Will not clobber existing file \"'nodelete.uu'\"
else
echo shar: Extracting \"'nodelete.uu'\" \(6607 characters\)
sed "s/^X//" >'nodelete.uu' <<'END_OF_FILE'
Xbegin 644 nodelete
XM```#\P`````````#``````````(```0I````O`````$```/I```$*4[Z""13%
XM>7-T96T@=')I97,@=&\@9F]O;"!A<F]U;F0N+BX``%EE<RP@1&5L971E(0``P
XM3V]P<RP@3F\@5V%Y(0!.50``2.?__DZZ"$XI08*:2JR``F=22'@`+B\L@II.S
XMN@;84$\I0()^2JR"?F<``+1"K()Z8"9R"B`L@GI.N@YF0>R!=M"(+P`O+()^G
XM3KH':%!/2H!F`F`04JR">B`L@GJPK(`&9=!@>DAZ`,9(;($F3KH&IE!/+RR"^
XMFDAL@29.N@KR4$](>@"X2&R!)DZZ"N103T'L@28I2(!.(&R"BBEH`#2"DDAX&
XM`#U(>`%H0J="ITAL@'Y(;(!J2&R`5B\L@I).N@]63^\`("E`@GI*K()Z9@I,?
XMWW__<`%.74YU2JR">F=,+&R"EB`\``!P]SU`_[@@/&```)(M0/^Z2JR`"F<*M
XM(BR"FG0`3J[_1B(L@II.KO^X2'K^[$AX_[@O+(*63KH.ED_O``Q,WW__<`%@"
XMJF"H1&5L971E($9I;&4@8``G/P``3E4``$JL@`YF'"\M``A.N@766$\O`"\MM
XM``@O+(*"3KH-L$_O``Q"IT*G3KH-[%A/+P!.N@Y44$]*K(*69Q@L;(*6(#P`!
XM`'#W/4#_N"`\8```DBU`_[I*K(*.9PHO+(*.3KH.DEA/2JR"EF<*+RR"EDZZZ
XM#8A83TJL@HIG"B\L@HI.N@UX6$]"ITZZ"TY83TY=3G4L;(*6#*Y@``"2_[IFD
XM!'`!8`)P`$YU3E7__$*G2'H$.$ZZ#9Q03RE`@I9.N@SV*4""@DAZ!"Y(;((JK
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END_OF_FILE
if test 6607 -ne `wc -c <'nodelete.uu'`; then
    echo shar: \"'nodelete.uu'\" unpacked with wrong size!
fi
# end of 'nodelete.uu'
fi
echo shar: End of archive 1 \(of 1\).
cp /dev/null ark1isdone
MISSING=""
for I in 1 ; do
    if test ! -f ark${I}isdone ; then
	MISSING="${MISSING} ${I}"
    fi
done
if test "${MISSING}" = "" ; then
    echo You have the archive.
    rm -f ark[1-9]isdone
else
    echo You still need to unpack the following archives:
    echo "        " ${MISSING}
fi
##  End of shell archive.
exit 0
-- 
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