On Fri, 01 Jul 2016, Markus Mayer <mmayer@xxxxxxxxxxxx> wrote:
> Add a function called strtolower() to convert strings to lower case
> in-place, overwriting the original string.
>
> This seems to be a recurring requirement in the kernel that is
> currently being solved by several duplicated implementations doing the
> same thing.
>
> Signed-off-by: Markus Mayer <mmayer@xxxxxxxxxxxx>
> ---
> include/linux/string.h | 1 +
> lib/string.c | 14 ++++++++++++++
> 2 files changed, 15 insertions(+)
>
> diff --git a/include/linux/string.h b/include/linux/string.h
> index 26b6f6a..aad605e 100644
> --- a/include/linux/string.h
> +++ b/include/linux/string.h
> @@ -116,6 +116,7 @@ extern void * memchr(const void *,int,__kernel_size_t);
> #endif
> void *memchr_inv(const void *s, int c, size_t n);
> char *strreplace(char *s, char old, char new);
> +char *strtolower(char *s);
>
> extern void kfree_const(const void *x);
>
> diff --git a/lib/string.c b/lib/string.c
> index ed83562..6e3b560 100644
> --- a/lib/string.c
> +++ b/lib/string.c
> @@ -952,3 +952,17 @@ char *strreplace(char *s, char old, char new)
> return s;
> }
> EXPORT_SYMBOL(strreplace);
> +
This needs a kernel-doc comment right here.
> +char *strtolower(char *s)
> +{
> + char *p;
> +
> + if (unlikely(!s))
> + return NULL;
Using spaces for indentation? See scripts/checkpatch.pl.
> +
> + for (p = s; *p; p++)
> + *p = tolower(*p);
> +
> + return s;
Why does it return a value? Could be void?
BR,
Jani.
> +}
> +EXPORT_SYMBOL(strtolower);
--
Jani Nikula, Intel Open Source Technology Center
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