linux-kernel - Re: [PATCH] powerpc: boot: add strrchr function

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Message-ID: <87h8pywu1m.fsf@concordia.ellerman.id.au>
Date:   Fri, 02 Mar 2018 23:17:41 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Rob Herring <robh@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH] powerpc: boot: add strrchr function

Rob Herring <robh@...nel.org> writes:

> libfdt gained a new dependency on strrchr, so copy the implementation
> from lib/string.c. Most of the string functions are in assembly, but
> stdio.c already has strnlen, so add strrchr there.
>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Signed-off-by: Rob Herring <robh@...nel.org>
> ---
> Please ack. This is a dependency for dtc/libfdt sync with upstream.

Yeah seems fine. At some point we should try and duplicate less code in
boot, but now is not that time.

Acked-by: Michael Ellerman <mpe@...erman.id.au>

cheers

> diff --git a/arch/powerpc/boot/stdio.c b/arch/powerpc/boot/stdio.c
> index a701261b1781..98042eff7b26 100644
> --- a/arch/powerpc/boot/stdio.c
> +++ b/arch/powerpc/boot/stdio.c
> @@ -21,6 +21,16 @@ size_t strnlen(const char * s, size_t count)
>  	return sc - s;
>  }
>  
> +char *strrchr(const char *s, int c)
> +{
> +	const char *last = NULL;
> +	do {
> +		if (*s == (char)c)
> +			last = s;
> +	} while (*s++);
> +	return (char *)last;
> +}
> +
>  #ifdef __powerpc64__
>  
>  # define do_div(n, base) ({						\
> -- 
> 2.14.1