Hello Simon, On 1/1/22 23:55, Simon Branch wrote: > While perusing various termios(3) and termios(4) manpages, I noticed the > following inconsistency for ONLRET. FreeBSD and NetBSD say this: > > If ONLRET is set, the NL character is assumed to do the carriage-return > function; the column pointer will be set to 0. > > OpenBSD says this: > > If ONLRET is set, NL also performs CR on output, and reset current column > to 0. > > POSIX says this: > > NL performs CR function. > > The current Linux manpage says this (!): > > Don't output CR. > > Here's a snippet that demonstrates Linux's behavior (tl;dr it's just like the > other operating systems): > > $ stty -icanon -onlcr -icrnl -echo onlret onocr; cat > this is some text (^J pressed) > and some more (^M pressed before additional text) > > The first flags (-icanon -onlcr -icrnl -echo), combined with cat, ensure that > our keys are sent directly back to the terminal emulator without any translation > or buffering. The last two (ONLRET and ONOCR) are the important ones: ONLRET > makes Linux think that the cursor is at column 0 after the ^J, and ONOCR makes > Linux ignore the following ^M. > > --- Thanks for the patch! I applied it, and signed it for you. <http://www.alejandro-colomar.es/src/alx/linux/man-pages/man-pages.git/commit/?id=958604aae25a096d2c28410633af04a8bd068a73> Cheers, Alex > man3/termios.3 | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/man3/termios.3 b/man3/termios.3 > index c11937458..20641f14d 100644 > --- a/man3/termios.3 > +++ b/man3/termios.3 > @@ -203,7 +203,9 @@ Map CR to NL on output. > Don't output CR at column 0. > .TP > .B ONLRET > -Don't output CR. > +The NL character is assumed to do the carriage-return function; > +the kernel's idea of the current column is set to 0 > +after both NL and CR. > .TP > .B OFILL > Send fill characters for a delay, rather than using a timed delay. -- Alejandro Colomar Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/ http://www.alejandro-colomar.es/
