linux-kernel - Re: [PATCH v4 1/2] mm: add kstrimdup function

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Date:	Wed, 29 Jan 2014 19:58:36 -0500 (EST)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	Sebastian Capella <sebastian.capella@...aro.org>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-pm@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	patches@...aro.org, Andrew Morton <akpm@...ux-foundation.org>,
	Michel Lespinasse <walken@...gle.com>,
	Shaohua Li <shli@...nel.org>,
	Jerome Marchand <jmarchan@...hat.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH v4 1/2] mm: add kstrimdup function



On Wed, 29 Jan 2014, Sebastian Capella wrote:

> kstrimdup will duplicate and trim spaces from the passed in
> null terminated string.  This is useful for strings coming from
> sysfs that often include trailing whitespace due to user input.
> 
> Signed-off-by: Sebastian Capella <sebastian.capella@...aro.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Rik van Riel <riel@...hat.com> (commit_signer:5/10=50%)
> Cc: Michel Lespinasse <walken@...gle.com>
> Cc: Shaohua Li <shli@...nel.org>
> Cc: Jerome Marchand <jmarchan@...hat.com>
> Cc: Mikulas Patocka <mpatocka@...hat.com>
> Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
> ---
>  include/linux/string.h |    1 +
>  mm/util.c              |   19 +++++++++++++++++++
>  2 files changed, 20 insertions(+)
> 
> diff --git a/include/linux/string.h b/include/linux/string.h
> index ac889c5..f29f9a0 100644
> --- a/include/linux/string.h
> +++ b/include/linux/string.h
> @@ -114,6 +114,7 @@ void *memchr_inv(const void *s, int c, size_t n);
>  
>  extern char *kstrdup(const char *s, gfp_t gfp);
>  extern char *kstrndup(const char *s, size_t len, gfp_t gfp);
> +extern char *kstrimdup(const char *s, gfp_t gfp);
>  extern void *kmemdup(const void *src, size_t len, gfp_t gfp);
>  
>  extern char **argv_split(gfp_t gfp, const char *str, int *argcp);
> diff --git a/mm/util.c b/mm/util.c
> index a24aa22..da17de5 100644
> --- a/mm/util.c
> +++ b/mm/util.c
> @@ -63,6 +63,25 @@ char *kstrndup(const char *s, size_t max, gfp_t gfp)
>  EXPORT_SYMBOL(kstrndup);
>  
>  /**
> + * kstrimdup - Trim and copy a %NUL terminated string.
> + * @s: the string to trim and duplicate
> + * @gfp: the GFP mask used in the kmalloc() call when allocating memory
> + *
> + * Returns an address, which the caller must kfree, containing
> + * a duplicate of the passed string with leading and/or trailing
> + * whitespace (as defined by isspace) removed.

It doesn't remove leading whitespace. To remove them, you need to do

char *p = strim(ret);
memmove(ret, p, strlen(p) + 1);

Mikulas

> + */
> +char *kstrimdup(const char *s, gfp_t gfp)
> +{
> +	char *ret = kstrdup(skip_spaces(s), gfp);
> +
> +	if (ret)
> +		strim(ret);
> +	return ret;
> +}
> +EXPORT_SYMBOL(kstrimdup);
> +
> +/**
>   * kmemdup - duplicate region of memory
>   *
>   * @src: memory region to duplicate
> -- 
> 1.7.9.5
> 
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