linux-kernel - Re: [PATCH] lib: string.c: Added a funktion function strzcpy

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Date:	Tue, 23 Sep 2014 15:40:46 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
Cc:	Grant Likely <grant.likely@...aro.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lib: string.c:  Added a funktion function strzcpy

On Wed, 24 Sep 2014 00:13:36 +0200 Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se> wrote:

> +/**
> + * strzcpy - Copy a length-limited, C-string
> + * @dest: Where to copy the string to
> + * @src: Where to copy the string from
> + * @count: The maximum number of bytes to copy
> + *
> + * The result is %NUL-terminated,
> + * as long as count is greater than zero.
> + *
> + * In the case where the length of @src is less than  that  of
> + * count, the remainder of @dest will be padded with %NUL.

As far as I can tell, this sentence describes the only difference
between strzcpy() and strlcpy().  Only the sentence is wrong - the
implementation doesn't actually do that.

> + */
> +char *strzcpy(char *dest, const char *src, size_t count)
> +{
> +	char *tmp = dest;
> +
> +	while (count) {
> +		if ((*tmp = *src) != 0)
> +			src++;
> +		tmp++;
> +		count--;
> +	}
> +
> +	if (dest != tmp)
> +		*--tmp = '\0';
> +
> +	return dest;
> +}
> +EXPORT_SYMBOL(strzcpy);
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