RE: [Freedos-kernel] ^Z
Hi! 12-Мар-2004 17:44 [EMAIL PROTECTED] (Roberto Mariottini) wrote to <[EMAIL PROTECTED]>: >> pressing ^Z in non-empty line does nothing (except that line end is ignored), >> only first ^Z on line is processed as end of input. >> Strange, but under MS-DOS I get same behavior. Another bug in MS-DOS? RM> I think this is the correct behaviour, IIRC in theory in text files an I discuss devices, not files. RM> End-Of-File must always be preceeded by an End-Of-Line. ? Don't know such theory. RM> So I think that a RM> Ctrl-Z inside a line (so not immediately after a CR/LF) is interpreted as RM> normal charcter input, with no special End-Of-File meaning. It _not_ interpreted as "normal character input", it removes (not passes to reading program) all other characters on the line after ^Z. RM> The confusion is still big, as many sources contradict each other on what a RM> "text file" is, and implementations too. RM> For example, Pascal function Eoln is always true if Eof is true, even if RM> ther isn't actually a CR/LF before Ctrl-Z (IIRC). --- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id70&alloc_id638&op=click ___ Freedos-kernel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/freedos-kernel
Re: [Freedos-kernel] ^Z
Hi! 12-Мар-2004 14:13 [EMAIL PROTECTED] (Alain) wrote to [EMAIL PROTECTED]: A> Some very ols OS used ^Z do know the end of the stream and thus close A> the file. This behaciour can still be found in MS-DOS with the command: A> copy con: >file A> where ^Z terminates the input. Should be "copy con file". A> MS-DOS kernel completely ignores ^Z in any file. This is right - MS-DOS presents another ways to deal with file limits. --- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id70&alloc_id638&op=click ___ Freedos-kernel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/freedos-kernel
Re: [Freedos-kernel] ^Z
Roberto Mariottini escreveu: Hi Arkady, pressing ^Z in non-empty line does nothing (except that line end is ignored), only first ^Z on line is processed as end of input. Strange, but under MS-DOS I get same behavior. Another bug in MS-DOS? I think this is the correct behaviour, IIRC in theory in text files an End-Of-File must always be preceeded by an End-Of-Line. So I think that a Ctrl-Z inside a line (so not immediately after a CR/LF) is interpreted as normal charcter input, with no special End-Of-File meaning. The confusion is still big, as many sources contradict each other on what a "text file" is, and implementations too. For example, Pascal function Eoln is always true if Eof is true, even if ther isn't actually a CR/LF before Ctrl-Z (IIRC). Some very ols OS used ^Z do know the end of the stream and thus close the file. This behaciour can still be found in MS-DOS with the command: copy con: >file where ^Z terminates the input. MS-DOS kernel completely ignores ^Z in any file. I know because of many problems in the past. A CR/LF is not requited before thee ^Z, in any system, just that _usualy_ text files are have CR/LF after the last line. BUT for example some databese programs require a ^Z after the last record of a .DBF file, but other don't require it and some others don't even put it there. One of them (iirc dBaseII) has even a bug that a ^Z in any field sometimes causes the file to get truncated. I hope this helps, Alain --- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click ___ Freedos-kernel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/freedos-kernel
RE: [Freedos-kernel] ^Z
Hi Arkady, > pressing ^Z > in non-empty line does nothing (except that line end is ignored), > only first > ^Z on line is processed as end of input. > > Strange, but under MS-DOS I get same behavior. Another bug in MS-DOS? I think this is the correct behaviour, IIRC in theory in text files an End-Of-File must always be preceeded by an End-Of-Line. So I think that a Ctrl-Z inside a line (so not immediately after a CR/LF) is interpreted as normal charcter input, with no special End-Of-File meaning. The confusion is still big, as many sources contradict each other on what a "text file" is, and implementations too. For example, Pascal function Eoln is always true if Eof is true, even if ther isn't actually a CR/LF before Ctrl-Z (IIRC). Ciao --- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click ___ Freedos-kernel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/freedos-kernel
