Home » Personal collection » Acorn ADFS disks » Electron_User_Group » EUG_19.ADF » P/SafTxt1
P/SafTxt1
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Personal collection » Acorn ADFS disks » Electron_User_Group » EUG_19.ADF |
| Filename: | P/SafTxt1 |
| Read OK: | ✔ |
| File size: | 0AE8 bytes |
| Load address: | 22204556 |
| Exec address: | 502E313A |
File contents
SAFE Protection for ADFS v2.00 ~~~~ ~~~~~~~~~~ ~~~ ~~~~ ~~~~~ By Ross Little ~~ ~~~~ ~~~~~~ The program 'SAFE', is a utility for ADFS users to prevent them fromoverwriting files accidently. It can only operate on ADFS with PAGE setat &1D00 because it reads the RAM directly. In addition, it will onlyprotect against overwriting programs in the Currently Selected Directory. Pathnames are NOT protected, even if they lead to the current directory. The program is intended to be copied to your workdisks, and maybe put in a!BOOT file. Because the routine intercepts the OSFILE routine which savesa complete file, it won't just stop at the BASIC 'SAVE' command, it willalso protect against the *SAVE command, and even extend into View and mostother interfaces. To use the routine, you should enter it by typing '*SAFE' with theappropriate disk in the drive. When entered, it will change certainmachine vectors, and display an introductory message. From now on, youcan use your normal save commands, and you will not be informed of it's presence unless a file you are trying to save exists. One point to note isthat, when it is not compulsory, quotation marks around filenames must notbe used. It is for this reason that I have also intercepted the *HELPcommand. When this (or an abbreviation) is typed, the first item will beassurance that the SAFE routine is still intact, even when you have passedparameters. This is deliberate, and for ease of use. The routine willusually only be prevented from operation by pressing BREAK, or turning the computer off. If you do this, it won't appear after a *HELP, which isyour reminder that it is no longer operational. To reuse it you caneither reload it with a *SAFE command, or simply type CALL &900, if you'venot turned the computer off. The routine intercepts any attempt to save a section of memory, and checksit against the filenames stored in RAM. If a match is found, then theuser will be queried whether he or she wishes to overwrite the file. Please note that the routine will not check to see if the file is lockedor if the disk has been changed. If any error has been found, it will bedisplayed. The routine has been deliberately written so that it can be avoided ifnecessary. If you wish to fool it into thinking your file does not exist,you can either enclose it in quotation marks when these are notcompulsory, place a pathname leading to the current directory, or, in some instances, place a space before the filename. Please note, though thatthe latter will not always work. The routine can be considered P.D.
00000000 53 41 46 45 20 50 72 6f 74 65 63 74 69 6f 6e 20 |SAFE Protection | 00000010 66 6f 72 20 41 44 46 53 20 20 20 76 32 2e 30 30 |for ADFS v2.00| 00000020 0d 7e 7e 7e 7e 20 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e |.~~~~ ~~~~~~~~~~| 00000030 20 7e 7e 7e 20 7e 7e 7e 7e 20 20 20 7e 7e 7e 7e | ~~~ ~~~~ ~~~~| 00000040 7e 0d 42 79 20 52 6f 73 73 20 4c 69 74 74 6c 65 |~.By Ross Little| 00000050 0d 7e 7e 20 7e 7e 7e 7e 20 7e 7e 7e 7e 7e 7e 0d |.~~ ~~~~ ~~~~~~.| 00000060 0d 54 68 65 20 10 70 72 6f 67 72 61 6d 20 10 27 |.The .program .'| 00000070 53 41 46 45 27 2c 20 69 73 20 61 20 75 74 69 6c |SAFE', is a util| 00000080 69 74 79 1a 20 66 6f 72 1a 20 41 44 46 53 1a 20 |ity. for. ADFS. | 00000090 75 73 65 72 73 1a 20 74 6f 1a 20 70 72 65 76 65 |users. to. preve| 000000a0 6e 74 20 0d 74 68 65 6d 20 10 10 66 72 6f 6d 10 |nt .them ..from.| 000000b0 10 6f 76 65 72 77 72 69 74 69 6e 67 1a 20 10 66 |.overwriting. .f| 000000c0 69 6c 65 73 1a 20 10 61 63 63 69 64 65 6e 74 6c |iles. .accidentl| 000000d0 79 2e 20 10 20 49 74 20 10 63 61 6e 20 10 6f 6e |y. . It .can .on| 000000e0 6c 79 20 0d 6f 70 65 72 61 74 65 20 10 6f 6e 20 |ly .operate .on | 000000f0 41 44 46 53 20 77 69 74 68 20 50 41 47 45 20 73 |ADFS with PAGE s| 00000100 65 74 10 61 74 20 26 31 44 30 30 20 62 65 63 61 |et.at &1D00 beca| 00000110 75 73 65 1a 20 69 74 1a 20 72 65 61 64 73 1a 20 |use. it. reads. | 00000120 74 68 65 1a 20 0d 52 41 4d 20 10 64 69 72 65 63 |the. .RAM .direc| 00000130 74 6c 79 2e 20 10 20 49 6e 20 10 61 64 64 69 74 |tly. . In .addit| 00000140 69 6f 6e 2c 20 10 69 74 20 77 69 6c 6c 20 6f 6e |ion, .it will on| 00000150 6c 79 10 70 72 6f 74 65 63 74 20 61 67 61 69 6e |ly.protect again| 00000160 73 74 20 0d 6f 76 65 72 77 72 69 74 69 6e 67 20 |st .overwriting | 00000170 10 70 72 6f 67 72 61 6d 73 20 10 69 6e 20 10 74 |.programs .in .t| 00000180 68 65 20 43 75 72 72 65 6e 74 6c 79 1a 20 53 65 |he Currently. Se| 00000190 6c 65 63 74 65 64 20 44 69 72 65 63 74 6f 72 79 |lected Directory| 000001a0 2e 20 10 0d 50 61 74 68 6e 61 6d 65 73 20 10 61 |. ..Pathnames .a| 000001b0 72 65 20 10 4e 4f 54 20 10 70 72 6f 74 65 63 74 |re .NOT .protect| 000001c0 65 64 2c 20 10 65 76 65 6e 20 10 69 66 20 10 74 |ed, .even .if .t| 000001d0 68 65 79 20 10 6c 65 61 64 1a 20 74 6f 1a 20 74 |hey .lead. to. t| 000001e0 68 65 20 0d 63 75 72 72 65 6e 74 20 10 64 69 72 |he .current .dir| 000001f0 65 63 74 6f 72 79 2e 20 10 54 68 65 20 70 72 6f |ectory. .The pro| 00000200 67 72 61 6d 20 69 73 20 69 6e 74 65 6e 64 65 64 |gram is intended| 00000210 20 74 6f 20 62 65 20 63 6f 70 69 65 64 20 74 6f | to be copied to| 00000220 20 0d 79 6f 75 72 20 10 77 6f 72 6b 64 69 73 6b | .your .workdisk| 00000230 73 2c 20 61 6e 64 20 6d 61 79 62 65 20 70 75 74 |s, and maybe put| 00000240 20 69 6e 20 61 10 21 42 4f 4f 54 20 66 69 6c 65 | in a.!BOOT file| 00000250 2e 20 20 42 65 63 61 75 73 65 20 74 68 65 20 0d |. Because the .| 00000260 72 6f 75 74 69 6e 65 20 10 10 69 6e 74 65 72 63 |routine ..interc| 00000270 65 70 74 73 20 10 10 74 68 65 20 10 4f 53 46 49 |epts ..the .OSFI| 00000280 4c 45 20 10 72 6f 75 74 69 6e 65 20 10 77 68 69 |LE .routine .whi| 00000290 63 68 20 10 73 61 76 65 73 10 10 61 20 0d 63 6f |ch .saves..a .co| 000002a0 6d 70 6c 65 74 65 20 10 66 69 6c 65 2c 20 10 69 |mplete .file, .i| 000002b0 74 20 10 77 6f 6e 27 74 20 10 6a 75 73 74 20 10 |t .won't .just .| 000002c0 73 74 6f 70 20 10 61 74 20 10 74 68 65 20 42 41 |stop .at .the BA| 000002d0 53 49 43 1a 20 27 53 41 56 45 27 1a 20 0d 63 6f |SIC. 'SAVE'. .co| 000002e0 6d 6d 61 6e 64 2c 20 10 69 74 20 10 77 69 6c 6c |mmand, .it .will| 000002f0 10 10 61 6c 73 6f 20 10 70 72 6f 74 65 63 74 20 |..also .protect | 00000300 61 67 61 69 6e 73 74 20 74 68 65 20 2a 53 41 56 |against the *SAV| 00000310 45 20 63 6f 6d 6d 61 6e 64 2c 20 0d 61 6e 64 20 |E command, .and | 00000320 65 76 65 6e 20 65 78 74 65 6e 64 20 69 6e 74 6f |even extend into| 00000330 20 56 69 65 77 20 61 6e 64 20 6d 6f 73 74 10 6f | View and most.o| 00000340 74 68 65 72 20 69 6e 74 65 72 66 61 63 65 73 2e |ther interfaces.| 00000350 0d 0d 54 6f 20 75 73 65 20 74 68 65 20 72 6f 75 |..To use the rou| 00000360 74 69 6e 65 2c 20 79 6f 75 1a 20 73 68 6f 75 6c |tine, you. shoul| 00000370 64 1a 20 65 6e 74 65 72 1a 20 69 74 1a 20 62 79 |d. enter. it. by| 00000380 1a 20 74 79 70 69 6e 67 1a 20 27 2a 53 41 46 45 |. typing. '*SAFE| 00000390 27 1a 20 0d 77 69 74 68 1a 20 74 68 65 10 61 70 |'. .with. the.ap| 000003a0 70 72 6f 70 72 69 61 74 65 1a 20 64 69 73 6b 1a |propriate. disk.| 000003b0 20 69 6e 1a 20 74 68 65 1a 20 64 72 69 76 65 2e | in. the. drive.| 000003c0 1a 20 20 57 68 65 6e 1a 20 65 6e 74 65 72 65 64 |. When. entered| 000003d0 2c 20 69 74 20 0d 77 69 6c 6c 20 63 68 61 6e 67 |, it .will chang| 000003e0 65 20 63 65 72 74 61 69 6e 10 6d 61 63 68 69 6e |e certain.machin| 000003f0 65 20 76 65 63 74 6f 72 73 2c 20 61 6e 64 20 64 |e vectors, and d| 00000400 69 73 70 6c 61 79 20 61 6e 20 0d 69 6e 74 72 6f |isplay an .intro| 00000410 64 75 63 74 6f 72 79 20 6d 65 73 73 61 67 65 2e |ductory message.| 00000420 1a 20 20 46 72 6f 6d 1a 20 6e 6f 77 1a 20 6f 6e |. From. now. on| 00000430 2c 20 79 6f 75 10 63 61 6e 20 75 73 65 20 79 6f |, you.can use yo| 00000440 75 72 20 6e 6f 72 6d 61 6c 20 0d 73 61 76 65 20 |ur normal .save | 00000450 63 6f 6d 6d 61 6e 64 73 2c 20 61 6e 64 20 79 6f |commands, and yo| 00000460 75 20 77 69 6c 6c 20 6e 6f 74 1a 20 62 65 1a 20 |u will not. be. | 00000470 69 6e 66 6f 72 6d 65 64 1a 20 6f 66 20 69 74 27 |informed. of it'| 00000480 73 10 0d 70 72 65 73 65 6e 63 65 20 75 6e 6c 65 |s..presence unle| 00000490 73 73 20 61 20 66 69 6c 65 20 79 6f 75 20 61 72 |ss a file you ar| 000004a0 65 20 74 72 79 69 6e 67 20 74 6f 20 73 61 76 65 |e trying to save| 000004b0 20 65 78 69 73 74 73 2e 20 4f 6e 65 20 0d 70 6f | exists. One .po| 000004c0 69 6e 74 20 74 6f 20 6e 6f 74 65 20 69 73 10 74 |int to note is.t| 000004d0 68 61 74 2c 20 77 68 65 6e 20 69 74 20 69 73 20 |hat, when it is | 000004e0 6e 6f 74 20 63 6f 6d 70 75 6c 73 6f 72 79 2c 20 |not compulsory, | 000004f0 71 75 6f 74 61 74 69 6f 6e 20 0d 6d 61 72 6b 73 |quotation .marks| 00000500 20 61 72 6f 75 6e 64 20 66 69 6c 65 6e 61 6d 65 | around filename| 00000510 73 20 6d 75 73 74 20 6e 6f 74 10 62 65 1a 20 75 |s must not.be. u| 00000520 73 65 64 2e 1a 20 20 49 74 1a 20 69 73 1a 20 66 |sed.. It. is. f| 00000530 6f 72 20 74 68 69 73 20 0d 72 65 61 73 6f 6e 20 |or this .reason | 00000540 74 68 61 74 20 49 20 68 61 76 65 20 61 6c 73 6f |that I have also| 00000550 20 69 6e 74 65 72 63 65 70 74 65 64 20 74 68 65 | intercepted the| 00000560 20 2a 48 45 4c 50 10 63 6f 6d 6d 61 6e 64 2e 20 | *HELP.command. | 00000570 20 0d 57 68 65 6e 20 74 68 69 73 20 28 6f 72 20 | .When this (or | 00000580 61 6e 1a 20 61 62 62 72 65 76 69 61 74 69 6f 6e |an. abbreviation| 00000590 29 20 69 73 20 74 79 70 65 64 2c 20 74 68 65 20 |) is typed, the | 000005a0 66 69 72 73 74 20 69 74 65 6d 20 0d 77 69 6c 6c |first item .will| 000005b0 20 62 65 10 61 73 73 75 72 61 6e 63 65 20 74 68 | be.assurance th| 000005c0 61 74 20 74 68 65 20 53 41 46 45 20 72 6f 75 74 |at the SAFE rout| 000005d0 69 6e 65 20 69 73 20 73 74 69 6c 6c 20 69 6e 74 |ine is still int| 000005e0 61 63 74 2c 20 0d 65 76 65 6e 20 77 68 65 6e 20 |act, .even when | 000005f0 79 6f 75 20 68 61 76 65 20 70 61 73 73 65 64 10 |you have passed.| 00000600 70 61 72 61 6d 65 74 65 72 73 2e 20 20 54 68 69 |parameters. Thi| 00000610 73 20 69 73 20 64 65 6c 69 62 65 72 61 74 65 2c |s is deliberate,| 00000620 20 0d 61 6e 64 20 66 6f 72 1a 20 65 61 73 65 1a | .and for. ease.| 00000630 20 6f 66 1a 20 75 73 65 2e 20 20 54 68 65 20 72 | of. use. The r| 00000640 6f 75 74 69 6e 65 20 77 69 6c 6c 10 75 73 75 61 |outine will.usua| 00000650 6c 6c 79 20 6f 6e 6c 79 20 62 65 20 0d 70 72 65 |lly only be .pre| 00000660 76 65 6e 74 65 64 20 66 72 6f 6d 20 6f 70 65 72 |vented from oper| 00000670 61 74 69 6f 6e 20 62 79 20 70 72 65 73 73 69 6e |ation by pressin| 00000680 67 20 42 52 45 41 4b 2c 20 6f 72 20 74 75 72 6e |g BREAK, or turn| 00000690 69 6e 67 20 74 68 65 10 0d 63 6f 6d 70 75 74 65 |ing the..compute| 000006a0 72 20 6f 66 66 2e 20 20 49 66 20 79 6f 75 20 64 |r off. If you d| 000006b0 6f 20 74 68 69 73 2c 20 69 74 20 77 6f 6e 27 74 |o this, it won't| 000006c0 20 61 70 70 65 61 72 1a 20 61 66 74 65 72 1a 20 | appear. after. | 000006d0 61 1a 20 0d 2a 48 45 4c 50 2c 1a 20 77 68 69 63 |a. .*HELP,. whic| 000006e0 68 20 69 73 10 79 6f 75 72 1a 20 72 65 6d 69 6e |h is.your. remin| 000006f0 64 65 72 1a 20 74 68 61 74 1a 20 69 74 1a 20 69 |der. that. it. i| 00000700 73 1a 20 6e 6f 1a 20 6c 6f 6e 67 65 72 20 0d 6f |s. no. longer .o| 00000710 70 65 72 61 74 69 6f 6e 61 6c 2e 20 20 54 6f 20 |perational. To | 00000720 72 65 75 73 65 20 69 74 20 79 6f 75 20 63 61 6e |reuse it you can| 00000730 10 65 69 74 68 65 72 20 72 65 6c 6f 61 64 20 69 |.either reload i| 00000740 74 20 77 69 74 68 20 61 20 0d 2a 53 41 46 45 20 |t with a .*SAFE | 00000750 63 6f 6d 6d 61 6e 64 2c 20 6f 72 20 73 69 6d 70 |command, or simp| 00000760 6c 79 20 74 79 70 65 20 43 41 4c 4c 20 26 39 30 |ly type CALL &90| 00000770 30 2c 20 69 66 20 79 6f 75 27 76 65 10 6e 6f 74 |0, if you've.not| 00000780 20 0d 74 75 72 6e 65 64 20 74 68 65 20 63 6f 6d | .turned the com| 00000790 70 75 74 65 72 20 6f 66 66 2e 0d 0d 54 68 65 20 |puter off...The | 000007a0 72 6f 75 74 69 6e 65 20 69 6e 74 65 72 63 65 70 |routine intercep| 000007b0 74 73 20 61 6e 79 20 61 74 74 65 6d 70 74 20 74 |ts any attempt t| 000007c0 6f 20 73 61 76 65 20 61 20 73 65 63 74 69 6f 6e |o save a section| 000007d0 20 6f 66 20 0d 6d 65 6d 6f 72 79 2c 20 61 6e 64 | of .memory, and| 000007e0 20 63 68 65 63 6b 73 10 69 74 20 61 67 61 69 6e | checks.it again| 000007f0 73 74 20 74 68 65 20 66 69 6c 65 6e 61 6d 65 73 |st the filenames| 00000800 20 73 74 6f 72 65 64 1a 20 69 6e 1a 20 52 41 4d | stored. in. RAM| 00000810 2e 1a 20 20 0d 49 66 1a 20 61 20 6d 61 74 63 68 |.. .If. a match| 00000820 20 69 73 20 66 6f 75 6e 64 2c 20 74 68 65 6e 20 | is found, then | 00000830 74 68 65 10 75 73 65 72 1a 20 77 69 6c 6c 1a 20 |the.user. will. | 00000840 62 65 20 71 75 65 72 69 65 64 20 77 68 65 74 68 |be queried wheth| 00000850 65 72 20 0d 68 65 20 6f 72 20 73 68 65 20 77 69 |er .he or she wi| 00000860 73 68 65 73 1a 20 74 6f 1a 20 6f 76 65 72 77 72 |shes. to. overwr| 00000870 69 74 65 1a 20 74 68 65 1a 20 66 69 6c 65 2e 20 |ite. the. file. | 00000880 10 50 6c 65 61 73 65 20 6e 6f 74 65 20 74 68 61 |.Please note tha| 00000890 74 1a 20 0d 74 68 65 1a 20 72 6f 75 74 69 6e 65 |t. .the. routine| 000008a0 20 77 69 6c 6c 20 6e 6f 74 20 63 68 65 63 6b 20 | will not check | 000008b0 74 6f 20 73 65 65 20 69 66 20 74 68 65 20 66 69 |to see if the fi| 000008c0 6c 65 20 69 73 20 6c 6f 63 6b 65 64 10 6f 72 20 |le is locked.or | 000008d0 0d 69 66 20 74 68 65 20 64 69 73 6b 20 68 61 73 |.if the disk has| 000008e0 1a 20 62 65 65 6e 20 63 68 61 6e 67 65 64 2e 20 |. been changed. | 000008f0 20 49 66 20 61 6e 79 20 65 72 72 6f 72 20 68 61 | If any error ha| 00000900 73 20 62 65 65 6e 20 66 6f 75 6e 64 2c 20 0d 69 |s been found, .i| 00000910 74 20 77 69 6c 6c 20 62 65 10 64 69 73 70 6c 61 |t will be.displa| 00000920 79 65 64 2e 0d 0d 54 68 65 20 72 6f 75 74 69 6e |yed...The routin| 00000930 65 20 68 61 73 20 62 65 65 6e 20 64 65 6c 69 62 |e has been delib| 00000940 65 72 61 74 65 6c 79 1a 20 77 72 69 74 74 65 6e |erately. written| 00000950 1a 20 73 6f 1a 20 74 68 61 74 1a 20 69 74 20 63 |. so. that. it c| 00000960 61 6e 20 62 65 20 0d 61 76 6f 69 64 65 64 20 69 |an be .avoided i| 00000970 66 10 6e 65 63 65 73 73 61 72 79 2e 20 20 49 66 |f.necessary. If| 00000980 20 79 6f 75 20 77 69 73 68 20 74 6f 20 66 6f 6f | you wish to foo| 00000990 6c 20 69 74 20 69 6e 74 6f 20 74 68 69 6e 6b 69 |l it into thinki| 000009a0 6e 67 20 0d 79 6f 75 72 20 66 69 6c 65 20 64 6f |ng .your file do| 000009b0 65 73 20 6e 6f 74 20 65 78 69 73 74 2c 10 79 6f |es not exist,.yo| 000009c0 75 1a 20 63 61 6e 1a 20 65 69 74 68 65 72 1a 20 |u. can. either. | 000009d0 65 6e 63 6c 6f 73 65 1a 20 69 74 1a 20 69 6e 1a |enclose. it. in.| 000009e0 20 0d 71 75 6f 74 61 74 69 6f 6e 1a 20 6d 61 72 | .quotation. mar| 000009f0 6b 73 1a 20 77 68 65 6e 1a 20 74 68 65 73 65 1a |ks. when. these.| 00000a00 20 61 72 65 1a 20 6e 6f 74 10 63 6f 6d 70 75 6c | are. not.compul| 00000a10 73 6f 72 79 2c 20 70 6c 61 63 65 20 61 20 0d 70 |sory, place a .p| 00000a20 61 74 68 6e 61 6d 65 20 6c 65 61 64 69 6e 67 20 |athname leading | 00000a30 74 6f 20 74 68 65 20 63 75 72 72 65 6e 74 20 64 |to the current d| 00000a40 69 72 65 63 74 6f 72 79 2c 20 6f 72 2c 20 69 6e |irectory, or, in| 00000a50 20 73 6f 6d 65 10 0d 69 6e 73 74 61 6e 63 65 73 | some..instances| 00000a60 2c 1a 20 70 6c 61 63 65 20 61 20 73 70 61 63 65 |,. place a space| 00000a70 20 62 65 66 6f 72 65 20 74 68 65 20 66 69 6c 65 | before the file| 00000a80 6e 61 6d 65 2e 20 20 50 6c 65 61 73 65 20 6e 6f |name. Please no| 00000a90 74 65 2c 1a 20 0d 74 68 6f 75 67 68 1a 20 74 68 |te,. .though. th| 00000aa0 61 74 10 74 68 65 20 6c 61 74 74 65 72 20 77 69 |at.the latter wi| 00000ab0 6c 6c 20 6e 6f 74 20 61 6c 77 61 79 73 20 77 6f |ll not always wo| 00000ac0 72 6b 2e 0d 0d 54 68 65 20 72 6f 75 74 69 6e 65 |rk...The routine| 00000ad0 20 63 61 6e 20 62 65 20 63 6f 6e 73 69 64 65 72 | can be consider| 00000ae0 65 64 20 50 2e 44 2e 0d |ed P.D..| 00000ae8
P/SafTxt1.m0
P/SafTxt1.m1
P/SafTxt1.m2
P/SafTxt1.m4
P/SafTxt1.m5
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