linux-kernel - Re: [PATCH v3] string.h: Add str_has

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Message-ID: <20181221190629.6f7fdf74@gandalf.local.home>
Date:   Fri, 21 Dec 2018 19:06:29 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Joe Perches <joe@...ches.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Tom Zanussi <zanussi@...nel.org>
Subject: Re: [PATCH v3] string.h: Add str_has_prefix() helper

On Fri, 21 Dec 2018 18:13:16 -0500
Steven Rostedt <rostedt@...dmis.org> 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?

-- Steve