Re: [PATCH v3] string.h: Add str_has_prefix() helper

[Joe Perches]

On Fri, 2018-12-21 at 19:06 -0500, Steven Rostedt wrote:
> On Fri, 21 Dec 2018 18:13:16 -0500
> Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
> 
> > +static __always_inline int str_has_prefix(const char *str, const char *prefix)
> 
> I'm thinking it is cleaner to have two helper functions and have them
> both return bool.
> 
> static __always_inline bool str_has_prefix(const char *str, const char *prefix)
> {
> 	return !strncmp(str, prefix, strlen(prefix));
> }
> 
> ( I still like to keep the __always_inline, it doesn't hurt )
> 
> And I'll make a separate patch that adds:
> 
> static __always_inline bool
> str_has_prefix_len(const char *str, const char *prefix, unsigned int *len)
> {
> 	*len = strlen(prefix);
> 	return !strncmp(str, prefix, *len) ? *len : 0;
> }
> 
> Everyone OK with that? 

I guess so as you're the one doing all the work.

Trivia:

Shouldn't the latter function use __kernel_size_t
as that's the actual return type of strlen?

Thanks for keeping at it.