Re: Get cursor position (Was: [bug report] prompt can erase messages written on the terminal by background processes)

[Stephane Chazelas <stephane@xxxxxxxxxxxx>]

2022-12-09 13:46:21 +0100, Philippe Altherr:
[...]
> assign() {
> >     print -v "$1" "$2"
> > }
[...]

Note that that "assign" function has a command injection
vulnerability.

Even more  so than for other  commands, -- (- also works) should
always be used for "print" to separate options from non-options
at least when the first non-option argument is not guaranteed
not to start with - or +.

Try for instance:

assign var '-va[1$(reboot)]'

So:

assign() print -rv "$1" -- "$2"

Or the Bourne-compatible:

assign() eval "$1=\$2"

Or POSIX:

assign() { eval "$1=\$2"; }

A bit ironic that people often go to great lengths to avoid
using "eval" but end up coming up with unsafe solutions.

-- 
Stephane