* [PATCH 2/2] system_data_types.7: void *: Add info about pointer artihmetic
@ 2020-10-02 9:44 Alejandro Colomar
2020-10-02 9:46 ` Alejandro Colomar
0 siblings, 1 reply; 2+ messages in thread
From: Alejandro Colomar @ 2020-10-02 9:44 UTC (permalink / raw)
To: mtk.manpages, eggert, David.Laight
Cc: Alejandro Colomar, linux-man, gcc-patches, libc-alpha, linux-kernel
Reported-by: Paul Eggert <eggert@cs.ucla.edu>
Reported-by: David Laight <David.Laight@ACULAB.COM>
Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
---
Paul and David,
Thanks for your input!
Alex
man7/system_data_types.7 | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/man7/system_data_types.7 b/man7/system_data_types.7
index 6451782db..bc7d5a8a0 100644
--- a/man7/system_data_types.7
+++ b/man7/system_data_types.7
@@ -1918,6 +1918,17 @@ A value of this type can't be dereferenced,
as it would give a value of type
.I void
which is not possible.
+Likewise, pointer arithmetic is not possible with this type.
+However, in GNU C, poitner arithmetic is allowed
+as an extension to the standard;
+this is done by treating the size of a
+.I void
+or of a function as 1.
+A consequence of this is that
+.I sizeof
+is also allowed on
+.I void
+and on function types, and returns 1.
.PP
The conversion specifier for
.I void *
--
2.28.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH 2/2] system_data_types.7: void *: Add info about pointer artihmetic
2020-10-02 9:44 [PATCH 2/2] system_data_types.7: void *: Add info about pointer artihmetic Alejandro Colomar
@ 2020-10-02 9:46 ` Alejandro Colomar
0 siblings, 0 replies; 2+ messages in thread
From: Alejandro Colomar @ 2020-10-02 9:46 UTC (permalink / raw)
To: mtk.manpages, eggert, David.Laight
Cc: linux-man, gcc-patches, libc-alpha, linux-kernel
Hi Michael,
The 2/2 is a typo. This is a standalone patch.
Cheers,
Alex
On 2020-10-02 11:44, Alejandro Colomar wrote:
> Reported-by: Paul Eggert <eggert@cs.ucla.edu>
> Reported-by: David Laight <David.Laight@ACULAB.COM>
> Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
> ---
>
> Paul and David,
> Thanks for your input!
>
> Alex
>
>
> man7/system_data_types.7 | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/man7/system_data_types.7 b/man7/system_data_types.7
> index 6451782db..bc7d5a8a0 100644
> --- a/man7/system_data_types.7
> +++ b/man7/system_data_types.7
> @@ -1918,6 +1918,17 @@ A value of this type can't be dereferenced,
> as it would give a value of type
> .I void
> which is not possible.
> +Likewise, pointer arithmetic is not possible with this type.
> +However, in GNU C, poitner arithmetic is allowed
> +as an extension to the standard;
> +this is done by treating the size of a
> +.I void
> +or of a function as 1.
> +A consequence of this is that
> +.I sizeof
> +is also allowed on
> +.I void
> +and on function types, and returns 1.
> .PP
> The conversion specifier for
> .I void *
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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