From: Pierre Habouzit <madcoder@debian.org>
Date: Sun, 07 Oct 2007 14:39:12 GMT
Subject: Re: [PATCH] Make strbuf_cmp inline, constify its arguments and optimize it a bit
Message-ID: <20071007143912.GB10024@artemis.corp>
In-Reply-To: <20071007172425.bb691da9.tihirvon@gmail.com>

On Sun, Oct 07, 2007 at 02:24:25PM +0000, Timo Hirvonen wrote:
> Alex Riesen <raa.lkml@gmail.com> wrote:
> 
> > +static inline int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
> > +{
> > +	int len = a->len < b->len ? a->len: b->len;
> > +	int cmp = memcmp(a->buf, b->buf, len);
> > +	if (cmp)
> > +		return cmp;
> > +	return a->len < b->len ? -1: a->len != b->len;
> > +}
> 
> strbuf->buf is always non-NULL and NUL-terminated so you could just do
> 
> static inline int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
> {
> 	int len = a->len < b->len ? a->len : b->len;
> 	return memcmp(a->buf, b->buf, len + 1);
> }

  doesn't work, because a buffer can have (in some very specific cases)
an embeded NUL.

-- 
·O·  Pierre Habouzit
··O                                                madcoder@debian.org
OOO                                                http://www.madism.org