linux-kernel - Re: [PATCH] linux/string.h: Introduce streq macro.

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Message-ID: <1303926576.18763.75.camel@gandalf.stny.rr.com>
Date:	Wed, 27 Apr 2011 13:49:36 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Thiago Farina <tfransosi@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Alexey Dobriyan <adobriyan@...il.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Ingo Molnar <mingo@...e.hu>,
	"David S. Miller" <davem@...emloft.net>,
	Al Viro <viro@...iv.linux.org.uk>, Ted Ts'o <tytso@....edu>,
	Christoph Hellwig <hch@...radead.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] linux/string.h: Introduce streq macro.

On Tue, 2011-04-26 at 16:45 -0300, Thiago Farina wrote:
> This macro is arguably more readable than its variants:
> - !strcmp(a, b)
> - strcmp(a, b) == 0

Actually, this was proposed way back in 2002 my Rusty and I did not see
anyone arguing against it. I wonder why it never was incorporated back
then?

http://marc.info/?l=linux-kernel&m=103284339813100&w=2

[ added Cc's of some of those that replied to this thread ]

-- Steve


> Signed-off-by: Thiago Farina <tfransosi@...il.com>
> ---
>  Changes from v1 (Steven and Alexey review):
>  - Convert from macro to static inline.
>  - Remove the example.
>  - Add the suggested comment by Steven.
> 
>  include/linux/string.h |   15 +++++++++++++++
>  1 files changed, 15 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/string.h b/include/linux/string.h
> index a716ee2..d859bb2 100644
> --- a/include/linux/string.h
> +++ b/include/linux/string.h
> @@ -134,6 +134,21 @@ extern ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos,
>  			const void *from, size_t available);
>  
>  /**
> + * streq - Are two strings equal?
> + * @a: first string
> + * @b: second string
> + *
> + * Use: streq(a, b)
> + * Instead of: strcmp(a, b) == 0 or !strcmp(a, b)
> + *
> + * This makes the code more readable and less error prone.
> + */
> +static inline int streq(const char *a, const char *b)
> +{
> +	return strcmp(a, b) == 0;
> +}
> +
> +/**
>   * strstarts - does @str start with @prefix?
>   * @str: string to examine
>   * @prefix: prefix to look for.


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