From: ZheNing Hu <adlternative@gmail.com>
To: Felipe Contreras <felipe.contreras@gmail.com>
Cc: Phillip Wood <phillip.wood123@gmail.com>,
ZheNing Hu via GitGitGadget <gitgitgadget@gmail.com>,
Git List <git@vger.kernel.org>,
Junio C Hamano <gitster@pobox.com>,
Christian Couder <christian.couder@gmail.com>,
Hariom Verma <hariom18599@gmail.com>,
Karthik Nayak <karthik.188@gmail.com>,
Bagas Sanjaya <bagasdotme@gmail.com>, Jeff King <peff@peff.net>
Subject: Re: [PATCH 1/2] [GSOC] ref-filter: add %(raw) atom
Date: Sun, 30 May 2021 14:29:28 +0800 [thread overview]
Message-ID: <CAOLTT8TEkrxAgHvkCVXZDQpn0xSQAe_y7uMF89Q4QWwVd7MDcA@mail.gmail.com> (raw)
In-Reply-To: <60b25ca7a01c2_265088208af@natae.notmuch>
Felipe Contreras <felipe.contreras@gmail.com> 于2021年5月29日周六 下午11:24写道:
>
> Phillip Wood wrote:
> > On 27/05/2021 17:36, Felipe Contreras wrote:
> > > ZheNing Hu via GitGitGadget wrote:
> > > [...]
> > >> +static int memcasecmp(const void *vs1, const void *vs2, size_t n)
> > >
> > > Why void *? We can delcare as char *.
> >
> > If you look at how this function is used you'll see
> > int (*cmp_fn)(const void *, const void *, size_t);
> > cmp_fn = s->sort_flags & REF_SORTING_ICASE
> > ? memcasecmp : memcmp;
>
> Yeah, but why?
>
> We know we are comparing two char *. Presumably the reason is that
> memcmp and memcasecmp use void *, but that could be remedied with:
>
> cmp_fn = (int (*)(const char *, const char *, size_t))memcmp;
>
> That way the same cmp_fn could be used for the two cases.
>
> Either way I don't care particularly much. It also could be possible to
> use void * and do the casting in tolower().
>
I agree with Phillip's point of view here:
It would be better for memcasecmp and memcmp to be consistent.
> > > (and I personally prefer lower to upper)
> >
> > We should be using tolower() as that is what POSIX specifies for
> > strcasecmp() [1] which we are trying to emulate and there are cases[2] where
> > (tolower(c1) == tolower(c2)) != (toupper(c1) == toupper(c2))
>
> That's true.
>
How about something like this:
static int memcasecmp(const void *vs1, const void *vs2, size_t n)
{
- size_t i;
- const char *s1 = (const char *)vs1;
- const char *s2 = (const char *)vs2;
-
- for (i = 0; i < n; i++) {
- unsigned char u1 = s1[i];
- unsigned char u2 = s2[i];
- int U1 = toupper (u1);
- int U2 = toupper (u2);
- int diff = (UCHAR_MAX <= INT_MAX ? U1 - U2
- : U1 < U2 ? -1 : U2 < U1);
+ const char *s1 = (const void *)vs1;
+ const char *s2 = (const void *)vs2;
+ const char *end = s1 + n;
+
+ for (; s1 < end; s1++, s2++) {
+ int diff = tolower(*s1) - tolower(*s2);
if (diff)
return diff;
}
}
> --
> Felipe Contreras
Thanks.
--
ZheNing Hu
next prev parent reply other threads:[~2021-05-30 6:29 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-27 14:43 [PATCH 0/2] [GSOC] ref-filter: add %(raw) atom ZheNing Hu via GitGitGadget
2021-05-27 14:43 ` [PATCH 1/2] " ZheNing Hu via GitGitGadget
2021-05-27 16:36 ` Felipe Contreras
2021-05-28 13:02 ` ZheNing Hu
2021-05-28 16:30 ` Felipe Contreras
2021-05-30 5:37 ` ZheNing Hu
2021-05-29 13:23 ` Phillip Wood
2021-05-29 15:24 ` Felipe Contreras
2021-05-29 17:23 ` Phillip Wood
2021-05-30 6:29 ` ZheNing Hu [this message]
2021-05-30 13:05 ` Phillip Wood
2021-05-31 14:15 ` ZheNing Hu
2021-05-31 15:35 ` Felipe Contreras
2021-05-30 6:26 ` ZheNing Hu
2021-05-30 13:02 ` Phillip Wood
2021-05-28 3:03 ` Junio C Hamano
2021-05-28 15:04 ` ZheNing Hu
2021-05-28 16:38 ` Felipe Contreras
2021-05-30 8:11 ` ZheNing Hu
2021-05-27 14:43 ` [PATCH 2/2] [GSOC] ref-filter: add %(header) atom ZheNing Hu via GitGitGadget
2021-05-27 16:37 ` Felipe Contreras
2021-05-28 3:06 ` Junio C Hamano
2021-05-28 4:36 ` Junio C Hamano
2021-05-28 15:19 ` ZheNing Hu
2021-05-27 15:39 ` [PATCH 0/2] [GSOC] ref-filter: add %(raw) atom Felipe Contreras
2021-05-30 13:01 ` [PATCH v2 " ZheNing Hu via GitGitGadget
2021-05-30 13:01 ` [PATCH v2 1/2] [GSOC] ref-filter: add obj-type check in grab contents ZheNing Hu via GitGitGadget
2021-05-31 5:34 ` Junio C Hamano
2021-05-30 13:01 ` [PATCH v2 2/2] [GSOC] ref-filter: add %(raw) atom ZheNing Hu via GitGitGadget
2021-05-31 0:44 ` Junio C Hamano
2021-05-31 14:35 ` ZheNing Hu
2021-06-01 9:54 ` Junio C Hamano
2021-06-01 11:05 ` ZheNing Hu
2021-05-31 4:04 ` Junio C Hamano
2021-05-31 14:40 ` ZheNing Hu
2021-06-01 8:54 ` Junio C Hamano
2021-06-01 11:00 ` ZheNing Hu
2021-06-01 13:48 ` Johannes Schindelin
2021-05-31 4:10 ` Junio C Hamano
2021-05-31 15:41 ` Felipe Contreras
2021-06-01 10:37 ` ZheNing Hu
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