From: David Bremner <david@tethera.net>
To: Tomi Ollila <tomi.ollila@iki.fi>, notmuch@notmuchmail.org
Subject: Re: [PATCH 04/15] lib/thread: sort sibling messages by date
Date: Mon, 03 Sep 2018 12:18:02 -0300 [thread overview]
Message-ID: <87wos2vcd1.fsf@unb.ca> (raw)
In-Reply-To: <m2d0txqh0q.fsf@guru.guru-group.fi>
Tomi Ollila <tomi.ollila@iki.fi> writes:
>> +static int
>> +_cmpmsg (const void *pa, const void *pb)
>> +{
>> + notmuch_message_t **a = (notmuch_message_t **) pa;
>> + notmuch_message_t **b = (notmuch_message_t **) pb;
>> + time_t time_a = notmuch_message_get_date (*a);
>> + time_t time_b = notmuch_message_get_date (*b);
>> +
>> + return (int) difftime (time_a, time_b);
>
> time_t is often 64 bits now (and I suspect signed). int is often 32-bits
> (gcc -dM -E -xc /dev/null | grep -i size to verify), perhaps time_t as
> return value ?
>
The return type is defined as int by the qsort prototype.
What we care about here is the sign. I think it's better to just avoid
difftime
- return (int) difftime (time_a, time_b);
+ if (time_a == time_b)
+ return 0;
+ else if (time_a < time_b)
+ return -1;
+ else
+ return 1;
}
next prev parent reply other threads:[~2018-09-03 15:18 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-30 11:29 threading replies fixes v3 David Bremner
2018-08-30 11:29 ` [PATCH 01/15] util: add DEBUG_PRINTF, rename error_util.h -> debug_print.h David Bremner
2018-09-01 17:06 ` Tomi Ollila
2018-09-03 11:54 ` David Bremner
2018-08-30 11:29 ` [PATCH 02/15] test: start threading test corpus David Bremner
2018-08-30 11:29 ` [PATCH 03/15] test: add known broken tests for "ghost roots" David Bremner
2018-08-30 11:29 ` [PATCH 04/15] lib/thread: sort sibling messages by date David Bremner
2018-09-01 17:11 ` Tomi Ollila
2018-09-03 15:18 ` David Bremner [this message]
2018-08-30 11:29 ` [PATCH 05/15] lib: read reference terms into message struct David Bremner
2018-08-30 11:29 ` [PATCH 06/15] lib/thread: refactor in_reply_to test David Bremner
2018-09-01 20:02 ` Tomi Ollila
2018-08-30 11:29 ` [PATCH 07/15] lib/thread: initial use of references as for fallback parenting David Bremner
2018-08-30 11:29 ` [PATCH 08/15] lib: calculate message depth in thread David Bremner
2018-08-30 11:29 ` [PATCH 09/15] lib/thread: rewrite _parent_or_toplevel to use depths David Bremner
2018-08-30 11:29 ` [PATCH 10/15] lib/thread: change _resolve_thread_relationships " David Bremner
2018-08-30 11:29 ` [PATCH 11/15] test: add known broken test for good In-Reply-To / bad References David Bremner
2018-08-30 11:29 ` [PATCH 12/15] test/thread-replies: mangle In-Reply-To's David Bremner
2018-08-30 11:29 ` [PATCH 13/15] util/string-util: export skip_space David Bremner
2018-08-30 11:29 ` [PATCH 14/15] lib: add _notmuch_message_id_parse_strict David Bremner
2018-09-01 20:27 ` Tomi Ollila
2018-08-30 11:29 ` [PATCH 15/15] lib: change parent strategy to use In-Reply-To if it looks sane David Bremner
2018-09-01 20:29 ` Tomi Ollila
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