Re: dash: read does not ignore trailing spaces

[Martijn Dekker <martijn@xxxxxxxx>]

Stephane Chazelas schreef op 03-12-15 om 22:17:
> It's meant to split into "a" and "b", not "a", "b" and "". As
> ":" is meant to be treated as a *delimiter* or *terminator*.

That was my interpretation of the standard, too. So I reported this as a
bug to author of yash, but he reads the standard differently and came up
with a good argument for that. See:

https://osdn.jp/ticket/browse.php?group_id=3863&tid=35283#comment:3863:35283:1435293070

Summarising: POSIX states that "each occurrence in the input of an IFS
character that is not IFS white space, along with any adjacent IFS white
space, shall delimit a field". This *may* be interpreted to read that a
final non-whitespace IFS character denotes an empty final field, because
otherwise that final character wouldn't be delimiting any field, but
only terminating one. It's pretty ambiguous, though.

Based on that discussion I concluded that both interpretations are
defensible, so I didn't report this to the zsh-workers list as a bug.
(In the shell library I'm developing, which you have an earlier copy of,
I gave this quirk the id QRK_IFSFINAL instead of BUG_IFSFINAL to reflect
that it's a quirk.) Maybe this is still worth bringing up on zsh-workers
as a discussion, but lately I haven't had much time.

- Martijn

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