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Re: AM_ICONV check fails with some shells
From: |
Bruno Haible |
Subject: |
Re: AM_ICONV check fails with some shells |
Date: |
Wed, 2 Jul 2008 01:18:25 +0200 |
User-agent: |
KMail/1.5.4 |
Timo Sirainen wrote:
> Apparently FreeBSD 7.0R or 6.3R without bash? Coud you answer Yasushi?
and got this reply:
> I use fdsh 3.00a as a login shell. fdsh can be installed by the
> package name "fdclone" on Debian GNU/Linux or Ubuntu Linux.
>
> Unfortunately, the top page of this program is only written in
> Japanese. Some documents are available in English
>
> http://hp.vector.co.jp/authors/VA012337/soft/fd/fd_e.txt
> http://hp.vector.co.jp/authors/VA012337/soft/fd/README.eng.txt
> http://hp.vector.co.jp/authors/VA012337/soft/fd/FAQ.eng.txt
> http://hp.vector.co.jp/authors/VA012337/soft/fd/Install.eng.txt
>
> Source code of the program can be downloaded from the below host.
> ftp://ftp.unixusers.net/src/fdclone/
It appears to be a bug in this shell.
POSIX [1], section "Parameter Expansion", says
"The format for parameter expansion is as follows:
${expression}
where expression consists of all characters until the matching '}'.
Any '}' escaped by a backslash or within a quoted string, and characters
in embedded arithmetic expansions, command substitutions, and variable
expansions, shall not be examined in determining the matching '}'"
"If a parameter expansion occurs inside double-quotes:
...
- Field splitting shall not be performed on the results of the
expansion, with the exception of '@' ; see Special Parameters."
Assuming ac_t is not a defined macro,
echo "foo${ac_t:-
}bar"
must print
foo
bar
There is no reason for the newline to be treated specially, because
- The description of "parameter expansion" talks about _all_characters_.
- Token Recognition (section 2.3 in POSIX) has already occurred: a
double-quoted string must have been recognized.
- Field splitting is not performed here, see above.
So it's a bug in that shell. Since it is under active development, I
expect this bug to be fixed in the future.
Bruno
[1] http://www.opengroup.org/susv3/utilities/xcu_chap02.html