URL:
<http://savannah.gnu.org/bugs/?48452>
Summary: termios flag OTILDE conflicts with TAB1
Project: The GNU Hurd
Submitted by: kon
Submitted on: Sat Jul 9 17:47:19 2016
Category: Hurd Servers
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Originator Name:
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Reproducibility: Every Time
Size (loc): None
Planned Release: None
Effort: 0.00
Wiki-like text discussion box:
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Details:
In the Hurd, term/term.h defines:
#define OTILDE (1 << 10)
This conflicts with <bits/termios.h>:
# define TAB1 (1 << 10) /* TAB delay type 1. */
So if I do "stty tab1", then the terminal converts each tilde (~) to
backslash-backtick (\`), even though that conversion has nothing to do with
tabs.
This conflict could be fixed by renumbering OTILDE, and then perhaps moving
its definition to termios.h like the comment in term/term.h says. However, I
think it's better to remove OTILDE altogether, because:
* GNU/Linux, NetBSD, OpenBSD, and FreeBSD neither implement an output mode
like this nor define an OTILDE macro.
* stty in coreutils does not have an option specifically for OTILDE.
* It's not documented in the glibc manual:
https://www.gnu.org/software/libc/manual/html_node/Output-Modes.html
* If the bash prompt contains a tilde (denoting the home directory) and it's
converted like this, then readline miscomputes the cursor position.
* The mode may have been useful for terminals that cannot display a tilde
(e.g. Hazeltine 1500), but it's unlikely that anyone is using such terminals
with the Hurd nowadays.
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