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Date: Fri, 20 Mar 2020 15:46:30 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: [PATCH] remove redundant condition in memccpy
On Mon, Mar 09, 2020 at 09:32:16PM +0300, Alexander Monakov wrote:
>
> Commit d9bdfd164 ("fix memccpy to not access buffer past given size")
> correctly added a check for 'n' nonzero, but made the pre-existing test
> '*s==c' redundant: n!=0 implies *s==c. Remove the unnecessary check.
>
> Reported by Alexey Izbyshev.
> ---
>
> Let me also point out that the aforementioned change did not appear
> on this mailing list.
>
> Alexander
>
> src/string/memccpy.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/src/string/memccpy.c b/src/string/memccpy.c
> index 00c18e2b..3b0a3700 100644
> --- a/src/string/memccpy.c
> +++ b/src/string/memccpy.c
> @@ -29,6 +29,6 @@ void *memccpy(void *restrict dest, const void *restrict src, int c, size_t n)
> #endif
> for (; n && (*d=*s)!=c; n--, s++, d++);
> tail:
> - if (n && *s==c) return d+1;
> + if (n) return d+1;
> return 0;
> }
Thanks, applying.
Rich
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