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Groups > comp.lang.c > #383607
| From | Tim Rentsch <tr.17687@z991.linuxsc.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: Word For Today: “Uglification” |
| Date | 2024-03-14 10:23 -0700 |
| Organization | A noiseless patient Spider |
| Message-ID | <86v85opw22.fsf@linuxsc.com> (permalink) |
| References | <uso6or$3t3jn$3@dont-email.me> <20240311202758.193@kylheku.com> |
Kaz Kylheku <433-929-6894@kylheku.com> writes:
[some editing of white space done]
> On 2024-03-12, Lawrence D'Oliveiro <ldo@nz.invalid> wrote:
>
>> From /usr/include/<<arch>>/bits/select.h on my Debian system:
>>
>> #define __FD_ZERO(s) \
>> do { \
>> unsigned int __i; \
>> fd_set *__arr = (s); \
>
> This assignment has value; it checks that, loosely speaking,
> s is an "assignment compatible" pointer with a fd_set *,
> so that there is a diagnostic if the macro is applied to
> an object of the wrong type.
More to the point, if the macro is applied to a value of the wrong
type.
>> for (__i = 0; __i < sizeof (fd_set) / sizeof (__fd_mask); ++__i) \
>> __FDS_BITS (__arr)[__i] = 0; \
>
> Here, I would have done memset(__arr, 0, sizeof *__arr).
That assumes that it is the entire fd_set that needs to be zeroed,
which may not be right. Note the call to the __FDS_BITS() macro.
Better:
#define __FD_ZERO(s) ( \
(void) memset( \
__FDS_BITS( (fd_set*){(s)} ), 0, sizeof __FDS_BITS( (fd_set*){0} ) \
) \
)
This definition: avoids introducing any new identifiers; checks
that the argument s yields an assignment compatible pointer; and
provides a macro that can be used as a void expression (unlike the
original macro definition, which can be used only as a statement).
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Word For Today: “Uglification” Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-03-12 00:14 +0000
Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-11 18:15 -0700
Re: Word For Today: “Uglification” Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-03-12 01:34 +0000
Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-11 19:56 -0700
Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-12 03:30 +0000
Re: Word For Today: “Uglification” Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-03-14 10:23 -0700
Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-14 14:31 -0700
Re: Word For Today: “Uglification” scott@slp53.sl.home (Scott Lurndal) - 2024-03-14 23:59 +0000
Re: Word For Today: “Uglification” scott@slp53.sl.home (Scott Lurndal) - 2024-03-15 00:01 +0000
Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-14 17:11 -0700
Re: Word For Today: “Uglification” scott@slp53.sl.home (Scott Lurndal) - 2024-03-15 00:33 +0000
Re: Word For Today: “Uglification” David Brown <david.brown@hesbynett.no> - 2024-03-15 09:15 +0100
Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-14 17:15 -0700
Re: Word For Today: “Uglification” scott@slp53.sl.home (Scott Lurndal) - 2024-03-15 00:34 +0000
Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-14 19:19 -0700
Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-15 03:17 +0000
Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-14 20:44 -0700
Re: Word For Today: “Uglification” David Brown <david.brown@hesbynett.no> - 2024-03-15 09:22 +0100
Re: Word For Today: “Uglification” Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-03-14 19:49 -0700
Re: Word For Today: “Uglification” James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-03-12 01:33 -0400
Re: Word For Today: “Uglification” Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-03-12 06:14 +0000
Re: Word For Today: “Uglification” Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-03-12 06:21 +0000
Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-12 07:44 +0000
Re: Word For Today: “Uglification” Richard Kettlewell <invalid@invalid.invalid> - 2024-03-12 08:03 +0000
Re: Word For Today: “Uglification” David Brown <david.brown@hesbynett.no> - 2024-03-12 11:10 +0100
Re: Word For Today: “Uglification” Anton Shepelev <anton.txt@g{oogle}mail.com> - 2024-03-12 17:46 +0300
Re: Word For Today: “Uglification” bart <bc@freeuk.com> - 2024-03-12 14:53 +0000
Re: Word For Today: “Uglification” Anton Shepelev <anton.txt@g{oogle}mail.com> - 2024-03-12 18:09 +0300
Re: Word For Today: “Uglification” bart <bc@freeuk.com> - 2024-03-12 15:42 +0000
Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-12 18:50 +0000
Re: Word For Today: “Uglification” bart <bc@freeuk.com> - 2024-03-12 22:29 +0000
Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-12 16:00 -0700
Re: Word For Today: “Uglification” bart <bc@freeuk.com> - 2024-03-13 11:45 +0000
Re: Word For Today: “Uglification” Michael S <already5chosen@yahoo.com> - 2024-03-13 14:12 +0200
Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-13 08:15 -0700
Re: Word For Today: “Uglification” David Brown <david.brown@hesbynett.no> - 2024-03-13 18:47 +0100
Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-13 11:56 -0700
Re: Word For Today: “Uglification” David Brown <david.brown@hesbynett.no> - 2024-03-13 22:07 +0100
Re: Word For Today: “Uglification” David Brown <david.brown@hesbynett.no> - 2024-03-13 16:40 +0100
Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-13 15:48 +0000
Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-13 09:03 -0700
Re: Word For Today: “Uglification” bart <bc@freeuk.com> - 2024-03-13 16:44 +0000
Re: Word For Today: “Uglification” Nick Bowler <nbowler@draconx.ca> - 2024-03-13 17:01 +0000
Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-13 02:53 +0000
Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-12 18:42 +0000
Re: Word For Today: “Uglification” Blue-Maned_Hawk <bluemanedhawk@invalid.invalid> - 2024-03-12 22:07 +0000
Re: Word For Today: “Uglification” Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-03-12 23:13 +0000
Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-12 16:29 -0700
Re: Word For Today: “Uglification” Richard Kettlewell <invalid@invalid.invalid> - 2024-03-13 09:01 +0000
Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-13 08:06 -0700
Re: Word For Today: “Uglification” Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-03-13 21:51 +0000
Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-13 22:16 +0000
Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-13 15:26 -0700
Re: Word For Today: “Uglification” scott@slp53.sl.home (Scott Lurndal) - 2024-03-13 22:33 +0000
Re: Word For Today: “Uglification” Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-03-13 22:50 +0000
Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-13 16:06 -0700
Re: Word For Today: “Uglification” Richard Kettlewell <invalid@invalid.invalid> - 2024-03-13 23:32 +0000
Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-14 00:40 +0000
Re: Word For Today: “Uglification” scott@slp53.sl.home (Scott Lurndal) - 2024-03-13 23:15 +0000
Re: Word For Today: “Uglification” Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-06-18 23:09 -0700
Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-13 00:23 +0000
Re: Word For Today: “Uglification” James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-03-12 11:51 -0400
Re: Word For Today: “Uglification” Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-03-12 21:31 +0000
Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-12 15:21 -0700
Re: Word For Today: “Uglification” James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-03-13 03:36 -0400
Re: Word For Today: “Uglification” Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-03-13 21:52 +0000
Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-13 22:10 +0000
Re: Word For Today: “Uglification” James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-03-13 20:47 -0400
Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-12 06:15 +0000
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