Re: [for-next][PATCH 23/24] string.h: Add strncmp_prefix() helper macro

Linus Torvalds
2018-12-21T22:29:52Z

On Fri, Dec 21, 2018 at 2:20 PM Joe Perches <joe@perches.com> wrote:
>
> Using
>
> static inline bool str_has_prefix(const char *str, const char prefix[])
> {
> return !strncmp(str, prefix, strlen(prefix));
> }
>
> eliminates the strlen with gcc 4.8 (oldest I still have)

Ok, that looks like the right thing to do.

Side note: in the kernel we disable the whole "unsigned vs signed"
pointer warning entirely, exactly because of the "char *" vs "unsigned
char *" problem.

Linus