Re: [PATCH 2/4] quote: add "sq_dequote_to_argv" to put unwrapped args in an argv array

> Christian Couder <chriscool@tuxfamily.org> writes:
> > This new function unwraps the space separated shell quoted elements in
> > its first argument and put a copy of them in the argv array passed as
> > its second argument.
> >
> > Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
> > ---
> >  quote.c |   17 +++++++++++++++++
> >  quote.h |    2 ++
> >  2 files changed, 19 insertions(+), 0 deletions(-)
> >
> > diff --git a/quote.c b/quote.c
> > index 8cf0ef4..5b12a4a 100644
> > --- a/quote.c
> > +++ b/quote.c
> > @@ -120,6 +120,23 @@ char *sq_dequote(char *arg)
> >  	return sq_dequote_many(arg, NULL);
> >  }
> >
> > +int sq_dequote_to_argv(char *arg, const char ***argv, int *nr, int
> > *alloc) +{
> > +	char *next = arg;
> > +
> > +	if (!*arg)
> > +		return 0;
> > +	do {
> > +		char *dequoted = sq_dequote_many(next, &next);
> > +		if (!dequoted)
> > +			return 1;
>
> Usually we signal an error with a negative value, e.g. -1.
>
> > +		ALLOC_GROW(*argv, *nr + 1, *alloc);
> > +		(*argv)[(*nr)++] = xstrdup(dequoted);
>
> The original sq_dequote() interface takes advantage of the fact that the
> result of single-quote unquoting is always shorter than the original and
> it can rewrite the argument in-place to return the result.  I would
> expect dequote_step() to retain that trait and allow the caller to use
> its return value without xstrdup().