From: Johannes Schindelin <Johannes.Schindelin@gmx.de>
To: "Torsten Bögershausen" <tboegi@web.de>
Cc: git@vger.kernel.org, Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH v2 1/8] ref-filter: avoid using `unsigned long` for catch-all data type
Date: Tue, 4 Apr 2017 00:47:58 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.20.1704040044420.4268@virtualbox> (raw)
In-Reply-To: <342cae56-ef58-3542-202d-6dd04d5777e8@web.de>
[-- Attachment #1: Type: text/plain, Size: 2950 bytes --]
Hi Torsten,
On Mon, 3 Apr 2017, Torsten Bögershausen wrote:
> On 02/04/17 21:06, Johannes Schindelin wrote:
> > In its `atom_value` struct, the ref-filter source code wants to store
> > different values in a field called `ul` (for `unsigned long`), e.g.
> > timestamps.
> >
> > However, as we are about to switch the data type of timestamps away from
> > `unsigned long` (because it may be 32-bit even when `time_t` is 64-bit),
> > that data type is not large enough.
> >
> > Simply change that field to use `uintmax_t` instead.
> >
> > This patch is a bit larger than the mere change of the data type
> > because the field's name was tied to its data type, which has been fixed
> > at the same time.
> >
> > Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
> > ---
> > ref-filter.c | 16 ++++++++--------
> > 1 file changed, 8 insertions(+), 8 deletions(-)
> >
> > diff --git a/ref-filter.c b/ref-filter.c
> > index 9c82b5b9d63..8538328fc7f 100644
> > --- a/ref-filter.c
> > +++ b/ref-filter.c
> > @@ -351,7 +351,7 @@ struct ref_formatting_state {
> > struct atom_value {
> > const char *s;
> > void (*handler)(struct atom_value *atomv, struct ref_formatting_state
> > *state);
> > - unsigned long ul; /* used for sorting when not FIELD_STR */
> > + uintmax_t value; /* used for sorting when not FIELD_STR */
> > struct used_atom *atom;
> > };
> >
> > @@ -723,7 +723,7 @@ static void grab_common_values(struct atom_value *val,
> > int deref, struct object
> > if (!strcmp(name, "objecttype"))
> > v->s = typename(obj->type);
> > else if (!strcmp(name, "objectsize")) {
> > - v->ul = sz;
> > + v->value = sz;
> > v->s = xstrfmt("%lu", sz);
> > }
> > else if (deref)
> > @@ -770,8 +770,8 @@ static void grab_commit_values(struct atom_value *val,
> > int deref, struct object
> > v->s = xstrdup(oid_to_hex(&commit->tree->object.oid));
> > }
> > else if (!strcmp(name, "numparent")) {
> > - v->ul = commit_list_count(commit->parents);
> > - v->s = xstrfmt("%lu", v->ul);
> > + v->value = commit_list_count(commit->parents);
> > + v->s = xstrfmt("%lu", (unsigned long)v->value);
>
> If we want to get rid of "%lu" at some day, we can do like this:
> v->s = xstrfmt("%" PRIuMAX, v->value);
> Or, to make clear that under all circumstances an unsigned long is big enough
> to
> hold the counter, for readers in the future, use something like this:
> v->s = xstrfmt("%lu", (xulong_t)v->value);
We could do that, yes.
But part of my patch series is to clarify in a semantic way what the
purpose of the code is. Your solution would keep it syntactically correct,
of course, but it would also make it semantically unclear again.
By writing "%"PRIutime *instead of* "%"PRIuMAX, we are saying: look, we
are talking about a timestamp here. That would not at all be clear if we
wrote "%"PRIuMAX.
Ciao,
Johannes
next prev parent reply other threads:[~2017-04-03 22:48 UTC|newest]
Thread overview: 113+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-27 21:30 [PATCH 0/6] Use time_t Johannes Schindelin
2017-02-27 21:30 ` [PATCH 1/6] t0006 & t5000: prepare for 64-bit time_t Johannes Schindelin
2017-02-27 22:55 ` Junio C Hamano
2017-02-27 21:30 ` [PATCH 2/6] Specify explicitly where we parse timestamps Johannes Schindelin
2017-02-27 22:37 ` Junio C Hamano
2017-02-27 22:51 ` Junio C Hamano
2017-02-28 10:49 ` Johannes Schindelin
2017-02-27 21:31 ` [PATCH 3/6] Introduce a new "printf format" for timestamps Johannes Schindelin
2017-03-01 18:20 ` Junio C Hamano
2017-03-01 19:53 ` Junio C Hamano
2017-02-27 21:31 ` [PATCH 4/6] Prepare for timestamps to use 64-bit signed types Johannes Schindelin
2017-02-27 21:31 ` [PATCH 5/6] ref-filter: avoid using `unsigned long` for catch-all data type Johannes Schindelin
2017-02-27 21:31 ` [PATCH 6/6] Use time_t where appropriate Johannes Schindelin
2017-02-27 22:48 ` [PATCH 0/6] Use time_t Junio C Hamano
2017-02-28 11:32 ` Johannes Schindelin
2017-02-28 14:28 ` Jeff King
2017-02-28 15:01 ` Johannes Schindelin
2017-02-28 16:38 ` René Scharfe
2017-02-28 18:55 ` Junio C Hamano
2017-02-28 20:04 ` Jeff King
2017-02-28 20:54 ` Johannes Schindelin
2017-02-28 21:31 ` Jeff King
2017-02-28 21:31 ` René Scharfe
2017-02-28 23:10 ` Johannes Schindelin
2017-03-01 0:59 ` René Scharfe
2017-02-28 17:26 ` Junio C Hamano
2017-02-28 20:01 ` Jeff King
2017-02-28 22:27 ` Junio C Hamano
2017-02-28 22:33 ` Jeff King
2017-03-01 17:23 ` Junio C Hamano
2017-04-02 19:06 ` [PATCH v2 0/8] Introduce timestamp_t for timestamps Johannes Schindelin
2017-04-02 19:06 ` [PATCH v2 1/8] ref-filter: avoid using `unsigned long` for catch-all data type Johannes Schindelin
2017-04-03 4:22 ` Torsten Bögershausen
2017-04-03 22:47 ` Johannes Schindelin [this message]
2017-04-02 19:06 ` [PATCH v2 2/8] t0006 & t5000: prepare for 64-bit timestamps Johannes Schindelin
2017-04-02 19:06 ` [PATCH v2 3/8] t0006 & t5000: skip "far in the future" test when time_t is too limited Johannes Schindelin
2017-04-02 19:06 ` [PATCH v2 4/8] Specify explicitly where we parse timestamps Johannes Schindelin
2017-04-03 4:26 ` Torsten Bögershausen
2017-04-03 22:50 ` Johannes Schindelin
2017-04-02 19:06 ` [PATCH v2 5/8] Introduce a new "printf format" for timestamps Johannes Schindelin
2017-04-02 19:06 ` [PATCH v2 6/8] Introduce a new data type " Johannes Schindelin
2017-04-02 19:07 ` [PATCH v2 7/8] Abort if the system time cannot handle one of our timestamps Johannes Schindelin
2017-04-02 19:07 ` [PATCH v2 8/8] Use uintmax_t for timestamps Johannes Schindelin
2017-04-20 20:52 ` [PATCH v3 0/8] Introduce timestamp_t " Johannes Schindelin
2017-04-20 20:52 ` [PATCH v3 1/8] ref-filter: avoid using `unsigned long` for catch-all data type Johannes Schindelin
2017-04-20 20:52 ` [PATCH v3 2/8] t0006 & t5000: prepare for 64-bit timestamps Johannes Schindelin
2017-04-20 20:58 ` [PATCH v3 3/8] t0006 & t5000: skip "far in the future" test when time_t is too limited Johannes Schindelin
2017-04-20 20:58 ` [PATCH v3 4/8] Specify explicitly where we parse timestamps Johannes Schindelin
2017-04-20 20:58 ` [PATCH v3 5/8] Introduce a new "printf format" for timestamps Johannes Schindelin
2017-04-20 20:58 ` [PATCH v3 6/8] Introduce a new data type " Johannes Schindelin
2017-04-20 20:58 ` [PATCH v3 7/8] Abort if the system time cannot handle one of our timestamps Johannes Schindelin
2017-04-20 20:59 ` [PATCH v3 8/8] Use uintmax_t for timestamps Johannes Schindelin
2017-04-21 6:05 ` [PATCH v3 0/8] Introduce timestamp_t " Junio C Hamano
2017-04-21 10:44 ` Johannes Schindelin
2017-04-21 10:45 ` [PATCH v4 0/9] " Johannes Schindelin
2017-04-21 10:45 ` [PATCH v4 1/9] ref-filter: avoid using `unsigned long` for catch-all data type Johannes Schindelin
2017-04-21 10:45 ` [PATCH v4 2/9] t0006 & t5000: prepare for 64-bit timestamps Johannes Schindelin
2017-04-21 10:45 ` [PATCH v4 3/9] t0006 & t5000: skip "far in the future" test when time_t is too limited Johannes Schindelin
2017-04-21 10:45 ` [PATCH v4 4/9] Specify explicitly where we parse timestamps Johannes Schindelin
2017-04-24 3:19 ` Junio C Hamano
2017-04-21 10:45 ` [PATCH v4 5/9] Introduce a new "printf format" for timestamps Johannes Schindelin
2017-04-21 10:45 ` [PATCH v4 6/9] Introduce a new data type " Johannes Schindelin
2017-04-21 10:45 ` [PATCH v4 7/9] Abort if the system time cannot handle one of our timestamps Johannes Schindelin
2017-04-24 3:16 ` Junio C Hamano
2017-04-24 13:57 ` Johannes Schindelin
2017-04-25 2:37 ` Junio C Hamano
2017-04-25 3:56 ` Junio C Hamano
2017-04-21 10:46 ` [PATCH v4 8/9] Use uintmax_t for timestamps Johannes Schindelin
2017-04-24 3:24 ` Junio C Hamano
2017-04-24 10:28 ` Johannes Schindelin
2017-04-25 3:59 ` Junio C Hamano
2017-04-25 20:10 ` Johannes Schindelin
2017-04-26 1:52 ` Junio C Hamano
2017-04-26 3:45 ` Junio C Hamano
2017-04-26 9:32 ` Johannes Schindelin
2017-04-26 13:18 ` Junio C Hamano
2017-04-21 10:46 ` [PATCH v4 9/9] show_date_ident(): defer date overflow check Johannes Schindelin
2017-04-24 3:29 ` [PATCH v4 0/9] Introduce timestamp_t for timestamps Junio C Hamano
2017-04-24 6:15 ` Jacob Keller
2017-04-24 14:02 ` Johannes Schindelin
2017-04-24 11:37 ` Jeff King
2017-04-25 20:13 ` Johannes Schindelin
2017-04-24 14:00 ` Johannes Schindelin
2017-04-24 13:57 ` [PATCH v5 0/8] " Johannes Schindelin
2017-04-24 13:57 ` [PATCH v5 1/8] ref-filter: avoid using `unsigned long` for catch-all data type Johannes Schindelin
2017-04-24 13:57 ` [PATCH v5 2/8] t0006 & t5000: prepare for 64-bit timestamps Johannes Schindelin
2017-04-24 13:58 ` [PATCH v5 3/8] t0006 & t5000: skip "far in the future" test when time_t is too limited Johannes Schindelin
2017-04-24 13:58 ` [PATCH v5 4/8] Specify explicitly where we parse timestamps Johannes Schindelin
2017-04-25 5:59 ` Junio C Hamano
2017-04-24 13:58 ` [PATCH v5 5/8] Introduce a new "printf format" for timestamps Johannes Schindelin
2017-04-24 13:58 ` [PATCH v5 6/8] Introduce a new data type " Johannes Schindelin
2017-04-26 16:43 ` Johannes Sixt
2017-04-26 19:18 ` Johannes Schindelin
2017-04-26 22:32 ` René Scharfe
2017-04-24 13:58 ` [PATCH v5 7/8] Abort if the system time cannot handle one of our timestamps Johannes Schindelin
2017-04-24 13:58 ` [PATCH v5 8/8] Use uintmax_t for timestamps Johannes Schindelin
2017-04-26 16:36 ` Johannes Sixt
2017-04-26 19:09 ` Johannes Schindelin
2017-04-25 21:54 ` [PATCH v5 0/8] Introduce timestamp_t " René Scharfe
2017-04-25 22:22 ` Johannes Schindelin
2017-04-26 22:09 ` René Scharfe
2017-04-26 1:56 ` Junio C Hamano
2017-04-26 19:20 ` [PATCH v6 " Johannes Schindelin
2017-04-26 19:26 ` [PATCH v6 1/8] ref-filter: avoid using `unsigned long` for catch-all data type Johannes Schindelin
2017-04-26 19:26 ` [PATCH v6 2/8] t0006 & t5000: prepare for 64-bit timestamps Johannes Schindelin
2017-04-26 19:26 ` [PATCH v6 3/8] t0006 & t5000: skip "far in the future" test when time_t is too limited Johannes Schindelin
2017-04-26 19:26 ` [PATCH v6 4/8] Specify explicitly where we parse timestamps Johannes Schindelin
2017-04-26 19:29 ` [PATCH v6 5/8] Introduce a new "printf format" for timestamps Johannes Schindelin
2017-04-26 19:29 ` [PATCH v6 6/8] Introduce a new data type " Johannes Schindelin
2017-05-20 5:47 ` [PATCH] name-rev: change a "long" variable to timestamp_t Junio C Hamano
2017-05-22 13:39 ` Johannes Schindelin
2017-04-26 19:29 ` [PATCH v6 7/8] Abort if the system time cannot handle one of our timestamps Johannes Schindelin
2017-04-26 19:29 ` [PATCH v6 8/8] Use uintmax_t for timestamps Johannes Schindelin
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