Messages in this thread | | | Date | Thu, 24 Sep 1998 15:40:30 -0400 (EDT) | From | "Richard B. Johnson" <> | Subject | Re: [PATCH] Speeding up FAT operations |
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On Thu, 24 Sep 1998, H. Peter Anvin wrote:
> > > > What GWBASIC used to do was create a file using the FCB function call > > 0x16. Then, since it had the original File-Control-Block in its > > address-space, it would put any characters it wanted, including > > lower-case, in the FCB when it closed it. This is what got written > > to the disk. This is also the way Peter Norton 'opened' a directory > > as a file so that he could sort its contents. > > > > The original post was a warning that one should not assume that there > > are no "incorrect" characters in a MS-DOS file-name. I can easily > > create a file called "*.*" and or "???????????", which can cause some > > problems with 'rm', etc., although such file-names are usually > > 'created' during a disk error. > > > > The FCB is a DOS system call. You can't create a file named > ???????????? etc with even an FCB system call. FILENAMETYP (you have one too many '?') > > -hpa >
Why not??? Here it is from both MS-DOS and from Linux.
Script started on Thu Sep 24 15:33:25 1998 # ls /dos/drive_C 3com config.def include newc.bat tcpip ????????.??? config.sys inter newnet temp amiboot contigu.ous io.sys norton testnet autoexec.bat decnet jboot overlay tmp bin dos lib pcplus tools binb edt lib.tmp pctcp unreal bit32 ems lint rangelan usnet bomb etc lintx rfcard wina20.386 buslogic etd logfile rtip2.3 work c600 exe masm save work.bat cfgws.dat flash msdos.sys source xxx.asm code float msvc src xxx.xxx command.com frame netcard stdbus xy # cat /dos/drive_C/xxx.xxx
Volume in drive C is DOS-622 Volume Serial Number is 2D42-15DD Directory of C:\
3COM <DIR> 03-23-98 1:01p AMIBOOT <DIR> 05-28-98 11:18a BIN <DIR> 01-07-97 11:53a BINB <DIR> 01-07-97 12:28p BIT32 <DIR> 01-27-97 10:00p BOMB <DIR> 01-26-97 2:58p BUSLOGIC <DIR> 07-27-98 9:13a C600 <DIR> 01-26-97 1:29p CODE <DIR> 08-21-97 4:02p DECNET <DIR> 01-07-97 11:45a DOS <DIR> 01-26-97 2:31p EDT <DIR> 03-07-97 9:43a EMS <DIR> 01-07-97 12:28p ETC <DIR> 01-07-97 12:28p ETD <DIR> 01-07-97 12:28p EXE <DIR> 01-07-97 12:28p FLASH <DIR> 04-23-98 8:37a FLOAT <DIR> 02-11-98 10:27a FRAME <DIR> 04-14-98 10:12a INCLUDE <DIR> 01-07-97 12:29p INTER <DIR> 02-09-98 11:00a JBOOT <DIR> 01-26-97 2:31p LIB <DIR> 01-07-97 12:29p LINT <DIR> 08-01-97 1:01p LINTX <DIR> 01-07-97 12:30p MASM <DIR> 01-07-97 12:30p MSVC <DIR> 10-15-97 11:25a NETCARD <DIR> 03-04-97 11:36a NEWNET <DIR> 12-23-97 11:34a NORTON <DIR> 01-07-97 12:30p OVERLAY <DIR> 01-07-97 12:30p PCPLUS <DIR> 01-07-97 12:30p PCTCP <DIR> 01-07-97 12:30p RANGELAN <DIR> 04-24-97 12:03p RFCARD <DIR> 03-24-97 5:33p RTIP2 3 <DIR> 10-14-97 6:06p SAVE <DIR> 01-07-97 12:32p SOURCE <DIR> 01-07-97 12:32p SRC <DIR> 01-07-97 12:32p STDBUS <DIR> 04-14-98 12:28p TCPIP <DIR> 02-02-98 11:39a TEMP <DIR> 01-07-97 12:44p TESTNET <DIR> 12-15-97 8:27a TMP <DIR> 01-07-97 12:44p TOOLS <DIR> 01-07-97 12:32p UNREAL <DIR> 07-10-98 1:06p USNET <DIR> 03-04-97 11:30a WORK <DIR> 01-26-97 3:52p XY <DIR> 01-07-97 12:33p AUTOEXEC BAT 1,445 07-08-98 11:50a CFGWS DAT 959 01-07-97 11:48a COMMAND COM 54,645 05-31-94 6:22a CONFIG DEF 510 09-24-98 9:29a CONFIG SYS 2,063 08-31-98 2:07p CONTIGU OUS 123,000,000 07-07-98 1:37p LIB TMP 0 09-18-98 10:21a NEWC BAT 1,466 03-16-98 10:23a WINA20 386 9,349 05-31-94 7:22a WORK BAT 42 09-10-98 10:30a XXX ASM 731 09-24-98 2:49p ???????? ??? 14 09-24-98 3:26p XXX XXX 0 09-24-98 3:30p 62 file(s) 123,071,224 bytes 752,238,592 bytes free # exit exit
Script done on Thu Sep 24 15:34:08 1998
Incidentally, the file XXX.ASM, all 731 bytes, creates such a file-name and I don't do anything special.
Cheers, Dick Johnson ***** FILE SYSTEM WAS MODIFIED ***** Penguin : Linux version 2.1.118 on an i586 machine (66.15 BogoMips). Warning : It's hard to remain at the trailing edge of technology.
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