Re: All programs are undefined

Joe Wright <joewwright@xxxxxxxxxxx> writes:
Keith Thompson wrote:
[...]
I've posted a question to comp.std.c, subject "Last line with or
without new-line".

Whose business is it? I suggest it is not C which defines 'line' but
perhaps the OS and its utilities.

Sorry, but the C standard does define "line"; see C99 7.19.2p2.

I run the following program..

#include <stdio.h>
int main(void) {
printf("Hello world\n");
printf("Good bye");
return 0;
}

..and redirect its output to a file, nl.txt. Now using a hex editor I
see that the second line is, in fact, not terminated with a
newline.

You probably ran it under an implementation that *doesn't* require a
new-line on the last line of a text stream. The results are exactly
what I'd expect.

Now I open nl.txt in an editor (edit.com?). I modify the file
changing the 'H' to 'J' and save it. Now as I look at it in the hex
editor I find the editor has added the newline to the last line of the
file.

I seem to remember vi will do the same thing.

The authors of those programs (which may or may not be implemented in
C) chose to transform a text file without a trailing new-line into one
with a trailing new-line. And how is this relevant to text streams in
C?

--
Keith Thompson (The_Other_Keith) <kst-u@xxxxxxx>
Nokia
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"
.

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