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From: "Bart Schaefer" <schaefer@candle.brasslantern.com>
Message-Id: <991123214038.ZM29906@candle.brasslantern.com>
Date: Tue, 23 Nov 1999 21:40:38 +0000
In-Reply-To: <19991123182219.A7795@thelonious.new.ox.ac.uk>
Comments: In reply to Adam Spiers <adam@spiers.net>
        "Re: "getopts" bugs and bad interactions with "shift"" (Nov 23,  6:22pm)
References: <991123180832.ZM29676@candle.brasslantern.com> 
	<19991123182219.A7795@thelonious.new.ox.ac.uk>
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To: zsh-workers@sunsite.auc.dk
Subject: Re: "getopts" bugs and bad interactions with "shift"
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On Nov 23,  6:22pm, Adam Spiers wrote:
> Subject: Re: "getopts" bugs and bad interactions with "shift"
> Bart Schaefer (schaefer@candle.brasslantern.com) wrote:
> > Question:  Is "getopts" based on some standard or emulated behavior of
> > some other shell, or is it strictly a zsh thing?
> 
> getopt is part of GNU libc [...]

In case it wasn't obvious from Zefram's post, "getopts" != "getopt".

The GNU "getopt" command (short-args-only form) is very roughly equivalent
to

    function getopt () {
	optstr=":$1"; shift
	got=()
	ret=0
	while getopts "$optstr" opt
        do
	    if [[ $opt == [?] ]]
	    then
		echo getopt: invalid option -- "$OPTARG" 1>&2
		ret=1
	    else
		got=("$got[@]" "-$opt" ${OPTARG:+"$OPTARG"})
	    fi
	done
	shift $OPTIND	# $((OPTIND-1)) if 3.0.7 or before
	echo "" "$got[@]" -- "$@"
	return $ret
    }