equivalent of chomp in perl

[lnatz]

Hi,
Is there an equivalent to the perl command chomp in C? And if there is
no exact equivalent command, how would I go about removing the "\n" at
the end of a stdin?

Thank you,
Natalie

[Keith Thompson]

james of tucson <jmcgill@[go_ahead_and_sp am_me].arizona.eduwri tes:

Keith Thompson wrote:

>If you happen to know what Perl's chomp function does

It removes zero or more instances of a globally defined character
equivalence from the end each element of an input list or each element
of the list of values of a hash.

You obviously don't want to deal with the details of an off-topic
language, but you were inaccurate in your description.

In the article to which you're replying, I did not attempt to fully
describe what Perl's chomp function does. I inferred what the OP was
trying to do from his description and from the subset of chomp's
behavior of which is easily translated to C. Elsethread, I quoted the
actual definition of chomp from the camel book.

BTW, your description is ambiguous. I don't know what you mean by
"character equivalence", and your description could easily be read to
imply that chomp applied to "hello\n\n" will remove both newline
characters. chomp removes zero or one character from each string.

--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <* <http://users.sdsc.edu/~kst>
We must do something. This is something. Therefore, we must do this.

[Keith Thompson]

james of tucson <jmcgill@[go_ahead_and_sp am_me].arizona.eduwri tes:

Jordan Abel wrote:

>Are you sure? chomp is used for a specific purpose, which is removing
the newline from a whole line read from input.

That's like saying printf(...) is used for a specific purpose, which is
putting the characters "Hello, world!" on the console.

Not really. Probably 99% of calls to chomp in Perl programs do
exactly that (though it's certainly far more versatile). Similarly,
printf() can do far more that print "Hello, world!"; the difference is
that in real programs it usually does.

--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <* <http://users.sdsc.edu/~kst>
We must do something. This is something. Therefore, we must do this.

[Walter Roberson]

In article <ln************ @nuthaus.mib.or g>,
Keith Thompson <ks***@mib.orgw rote:

[with respect to perl chomp]

>and your description could easily be read to
imply that chomp applied to "hello\n\n" will remove both newline
characters. chomp removes zero or one character from each string.

$ perldoc -f chomp
"When in paragraph mode ($/ = ""), it removes all trailing newlines
from the string."
--
"No one has the right to destroy another person's belief by
demanding empirical evidence." -- Ann Landers

[Walter Roberson]

In article <Fl************ ********@newsfe 10.phx>,
james of tucson <jmcgill@[go_ahead_and_sp am_me].arizona.eduwro te:

[perl chomp]

>I would almost bet that chomp() is implemented as a specialization of
map{}, which doesn't *have* a day job, but is pretty much the most
powerful thing in perl.

You'd lose that bet, at least in perl 5.8.4 (and probably much the
same for all earlier versions.) Source file doop.c about lines 1004
to 1139, Perl_do_chomp() routine. It is clearly its own routine,
not a calling upon map and clearly not being a degenerate version
of map. Quite a bit of of the routine is preoccupied with utf8 handling.

--
"It is important to remember that when it comes to law, computers
never make copies, only human beings make copies. Computers are given
commands, not permission. Only people can be given permission."
-- Brad Templeton

[Walter Roberson]

In article <i9************ ********@newsfe 10.phx>,
james of tucson <jmcgill@[go_ahead_and_sp am_me].arizona.eduwro te:

[perl chomp]

>It removes zero or more instances of a globally defined character
equivalence from the end each element of an input list or each element
of the list of values of a hash.

It does not, at least not at perl 5.8.4.

$ perldoc perlvar
$/ [...] You may set it to a multi-character string
to match a multi-character delimiter,
[...] Remember: the value of $/ is a string, not a regexp.
AWK has to be better for something :-)

Not, in other words, a character equivilance: it is a literal match,
except in its treatment of "", undef, and "\n\n" .
--
I was very young in those days, but I was also rather dim.
-- Christopher Priest

[Keith Thompson]

ro******@ibd.nr c-cnrc.gc.ca (Walter Roberson) writes:

In article <ln************ @nuthaus.mib.or g>,
Keith Thompson <ks***@mib.orgw rote:

[with respect to perl chomp]

>>and your description could easily be read to
imply that chomp applied to "hello\n\n" will remove both newline
characters. chomp removes zero or one character from each string.

$ perldoc -f chomp
"When in paragraph mode ($/ = ""), it removes all trailing newlines
from the string."

Ok, I missed that (even though I recently posted it myself). But
that's not the way it's usually used, and I don't believe it's what
the OP was looking for.

--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <* <http://users.sdsc.edu/~kst>
We must do something. This is something. Therefore, we must do this.