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

[Andrew Morton <akpm@linux-foundation.org>]

On Wed, 24 Sep 2014 00:13:36 +0200 Rickard Strandqvist <rickard_strandqvist@spectrumdigital.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);