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Arguments with whitespaces are easy to fix, but in combination with
shell metachars that should not be evaluated it is very hard, probably
impossible to fix without going to a line-oriented solution.

Next time I will believe Henry Spencer when he says "this looks easy
to fix but isn't".
This commit is contained in:
Martin Cracauer 1999-04-04 00:25:39 +00:00
parent 68b7e6e749
commit 0ab2a7ae85
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=45279
2 changed files with 16 additions and 27 deletions
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41
usr.bin/getopt/getopt.1
View File

@ -5,9 +5,9 @@
.Nm getopt
.Nd parse command options
.Sh SYNOPSIS
.Ic set \-\- \`getopt Ar optstring
.Ic var=\`getopt Ar optstring
.Qq $@
\`
\` ; set \-\- $var
.Sh DESCRIPTION
.Nm Getopt
is used to break up options in command lines for easy parsing by
@ -50,15 +50,17 @@ then
echo 'Usage: ...'
exit 2
fi
eval set \-\- $tmp
set \-\- $tmp
for i
do
case "$i"
in
\-a|\-b)
echo flag $i set; sflags="${i#-}$sflags"; shift;;
echo flag $i set; sflags="${i#-}$sflags";
shift;;
\-o)
echo oarg is "'"$2"'"; oarg="$2"; shift; shift;;
echo oarg is "'"$2"'"; oarg="$2"; shift;
shift;;
\-\-)
shift; break;;
esac
@ -75,12 +77,6 @@ cmd \-a \-o arg file file
cmd \-oarg -a file file
cmd \-a \-oarg \-\- file file
.Pp
Test your scripts with calls like this
.Pp
cmd \-ab \-o 'f \-z'
.Pp
to verify that they work with parameters/filenames that have
whitespace in them.
.Ed
.Sh SEE ALSO
.Xr sh 1 ,
@ -100,20 +96,8 @@ Whatever
.Xr getopt 3
has.
.Pp
It is hard to get command switch parsing right in shell scripts,
especially with arguments containing whitespace or embedded shell
metacharacters. This version of
.Nm getopt
and the example in this manpage have been fixed to avoid traditional
problems. They have been tested with
.Fx
.Xr sh 1
and with GNU bash. Note that bash has a builtin
.Nm getopt .
In shells with builtin
.Nm getopt
you need to call getopt with a full path to get the external version
described here.
Arguments containing white space or embedded shell metacharacters
generally will not survive intact; this looks easy to fix but isn't.
.Pp
The error message for an invalid option is identified as coming
from
@ -121,4 +105,9 @@ from
rather than from the shell procedure containing the invocation
of
.Nm getopt ;
this is hard to fix.
this again is hard to fix.
.Pp
The precise best way to use the
.Nm set
command to set the arguments without disrupting the value(s) of
shell options varies from one shell version to another.

2
usr.bin/getopt/getopt.c
View File

@ -17,7 +17,7 @@ char *argv[];
break;
default:
if (optarg != NULL)
printf(" -%c '%s'", c, optarg);
printf(" -%c %s", c, optarg);
else
printf(" -%c", c);
break;