[U-Boot] [PATCH v2 01/11] lib: charset: add u16_strcmp()

[Heinrich Schuchardt]

On 4/24/19 8:30 AM, AKASHI Takahiro wrote:
> u16 version of strcmp()
>
> AUTHER: Patrick Wildt <patrick at blueri.se>

%s/AUTHER/Author/

> Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
> ---
>   include/charset.h |  5 +++++
>   lib/charset.c     | 10 ++++++++++
>   2 files changed, 15 insertions(+)
>
> diff --git a/include/charset.h b/include/charset.h
> index 65087f76d1fc..747a9b376c03 100644
> --- a/include/charset.h
> +++ b/include/charset.h
> @@ -166,6 +166,11 @@ s32 utf_to_lower(const s32 code);
>    */
>   s32 utf_to_upper(const s32 code);
>
> +/*
> + * u16_strcmp() - strcmp() for u16 strings
> + */
> +int u16_strcmp(const u16 *s1, const u16 *s2);
> +
>   /**
>    * u16_strlen - count non-zero words
>    *
> diff --git a/lib/charset.c b/lib/charset.c
> index 5e349ed5ee45..4a25ac0bdb9c 100644
> --- a/lib/charset.c
> +++ b/lib/charset.c
> @@ -335,6 +335,16 @@ s32 utf_to_upper(const s32 code)
>   	return ret;
>   }
>
> +int u16_strcmp(const u16 *s1, const u16 *s2)
> +{
> +	while (*s1 == *s2++)
> +		if (*s1++ == 0)
> +			return (0);
> +	--s2;

for (;*s1 == *s2; ++s1, ++s2)
	if (!s1)
		return 0;

does the same job without superfluous increment/decrement.

> +
> +	return (*(uint16_t *)s1 - *(uint16_t *)s2);

Why would you use both u16 and uint16_t in the same function?
You can do without any conversion here.

How about

#define u16_strcmp(s1, s2) u16_strncmp(s1, s2, SIZE_MAX)

like we do for the other string functions?

Best regards

Heinrich

> +}
> +
>   size_t u16_strlen(const u16 *in)
>   {
>   	size_t i;
>