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
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