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- From: fairfield@slacvx.slac.stanford.edu
- Subject: CORRECTION: Re: long, long, really long DCL commands
- Message-ID: <1992Dec28.133901.1@slacvx.slac.stanford.edu>
- Lines: 83
- Sender: news@unixhub.SLAC.Stanford.EDU
- Organization: Stanford Linear Accelerator Center
- References: <1992Dec28.172453.24421@ramsey.cs.laurentian.ca> <1992Dec28.125931.1@slacvx.slac.stanford.edu>
- Date: Mon, 28 Dec 1992 21:39:01 GMT
-
- In a previous followup, I said:
-
- In article <1992Dec28.125931.1@slacvx.slac.stanford.edu>, fairfield@slacvx.slac.stanford.edu writes:
- [...]
- > DCL will accept ONLY 256 characters maximum on the command line,
- > whether that line is continued on multiple, shorter lines in the input
- > stream (terminal screen, command file) or not.
-
- I WAS WRONG :-( Geez, I wish I'd learn to test before posting...
-
- Neil Readwin <nreadwin@micrognosis.co.uk> gave a correct response,
- symbolically, which I verified myself. Here are two examples captured
- from my terminal screen:
- -------------------------------------------------------------------------------
- Example 1:
- ----------
- $ show logical asdlfjkasdlfjkhaskldjfhalkjdfhaksjdfhaskljdfhlaskjdfhaskjdfhasklj
- dfhaskjdfhaskljdhfalkjfhalskdjfhakljsdfhalkjhdflkajhdflkasjhasldfkjhasdflkjhalks
- dfjhakldsjfhaksljdhkljahsdfkajhdflaiuwhfaksdjhfiauwhfakjdhfaiuhfkajlhdfakjldhfiu
- ahaskdjfhasdfkjhas
- %RMS-W-TNS, terminator not seen
-
- In this case, a single line typed at DCL exceeded the 256 character limit.
- The length of the text above is just 256 characters, but the error message was
- generated because (as I interpret it), DCL saw 256 characters without a <cr>
- or other "terminator". The error message is "terminator not seen", after all.
-
- -------------------------------------------------------------------------------
- Example 2
- ---------
- $ show logical asdfjhafkdljhadfkjhadfkjhasdfkjhqwiufhaskjdhfwiauhfaksjhdfiquwhfk
- asdjhfkaljsdhfukahdfauhdfjhakljsdfhalukhefklahfkasjdhfiuqhfkjasdhfklauhefkasjdhf
- kajdhfkuahfklajhdfkluahekjasdhfuahfkjadshfiuahfeasdjfhdakjlhfawhasdjhvdakjfhiuah
- adkjfhadkfjsha,-
- _$ asldfkjaldkfjaslkdfjalsdkfjaslkdfjaslkdfjaslkdfjalskdfjsalkasdfjhaekfjhasdfha
- kehfkadjhfkajshdfkajhdfkjadhfkjasdhfkweuahjasdhfkuahfkjdghjadfhkulaehaksdjhfkadu
- hfkahfkdjhfhaiuhfkjdhfawkuehfkasjdhfkahdfkjasdhfkhuwqehfajsdhfkadduhfkuaehfkjdhf
- kahdfjhakjdfha,-
- _$ lsdfjaslkdfjaslkdfjaslk;dfjaoijfasldkghadsfjlkajfliasdjflkasdjfglk;asdjflkasd
- jflkasdjflkasjdflaskgdjasdihfasdlkjfalskddjflaksdjfaijflkasdjfasdlkjfadlskjfaijf
- adskfjalkdfjaslkdfjaasdfljaelkjdsafhasjkhfauehfdaskhfalkuefasdjhfasdjkhfauhdjhfa
- uhfajhdfjkahjk,-
- _$ asdkjfaslkdfjalksdjfalksdjfalksjdfalksdfjalskdfjaiejfakdsjfiarjfdkjfaijfadkfj
- iajfdkjfalkdjfaijfdashfdasjflkaeifhadkfjagrijafaohfdlkfhauhafhhadfhafadsjhfauhdf
- ahdfkasdhfuahfudahfadjhfaeuhrauhfuahjfhugfjfhadukhufahfuhfhuhfasduhfawegfldhfuia
- ewryadfksdjhda,-
- _$ asdfdsfrkjsdlfkj
- %DCL-W-BUFOVF, command buffer overflow - shorten expression or command line
- \ASDFDSFRKJSDLFK\
- $
-
- I haven't done the arithmetic carefully (it takes a long time to hit all
- those keys! ), but if I subtract off the prompt string, the first line is
- 254 chars, the second, third and forth are 253 chars, and the last is 15 chars,
- giving a total of 1038 characters. Since the total exceeds 1024, the error
- message is "command buffer overflow ...".
-
- -------------------------------------------------------------------------------
- > The 1024 character limit has to do with the resulting command string
- > after DCL has _expanded_ the command line, i.e., replaced symbols with their
- > "translations", evaluated lexical functions, etc. For example, if you had a
- > symbol
- >
- > $ DF == "DIRECTORY/FULL"
- >
- > and typed "DF", the DCL command line would be 2 characters (counted against
- > the 256 character limit), while the expanded command would be 14 characters
- > long (counted against the 1024 character limit).
-
- I believe this assertion is still true, with the modification that the
- 256 character limit is on any single line, possibly a continuation line.
-
- >
- > I'm sure others can give a more precise exposition (Don Stokes, are you
- > listening?), but this is the general idea...
-
- Indeed, I'd rather hear what an EXPERT has to say ;-)
- --
- Dr. Kenneth H. Fairfield | Internet: Fairfield@Slac.Stanford.Edu
- SLAC, P.O.Box 4349, MS 98 | DECnet: 45537::FAIRFIELD (45537=SLACVX)
- Stanford, CA 94309 | BITNET Fairfield@Slacvx
- ----------------------------------------------------------------------------
- These opinions are mine, not SLAC's, Stanford's, nor the DOE's...
-