[PATCH][BZ #431] Fix manual of strncat/wcsncat.

[Carlos O'Donell]

On 10/03/2013 04:36 AM, Ondřej Bílka wrote:
> Hi, this is quite old bug that implementation of strncat in manual is
> wrong. This replaces it with correct one
> 
> *	manual/string.texi: Fix strncat and wcsncat.

Looks good to me.
 
> ---
>  manual/string.texi | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/manual/string.texi b/manual/string.texi
> index 3329761..1e45d9d 100644
> --- a/manual/string.texi
> +++ b/manual/string.texi
> @@ -955,8 +955,8 @@ The @code{strncat} function could be implemented like this:
>  char *
>  strncat (char *to, const char *from, size_t size)
>  @{
> -  to[strlen (to) + size] = '\0';
> -  strncpy (to + strlen (to), from, size);
> +  memcpy (to + strlen (to), from, strnlen (from, size));
> +  to[strlen (to) + strnlen (from, size)] = '\0';
>    return to;
>  @}
>  @end group
> @@ -982,8 +982,8 @@ wchar_t *
>  wcsncat (wchar_t *restrict wto, const wchar_t *restrict wfrom,
>           size_t size)
>  @{
> -  wto[wcslen (to) + size] = L'\0';
> -  wcsncpy (wto + wcslen (wto), wfrom, size);
> +  memcpy (wto + wcslen (wto), wfrom, wcsnlen (wfrom, size) * sizeof (wchar_t));
> +  wto[wcslen (to) + wcsnlen (wfrom, size)] = '\0';
>    return wto;
>  @}
>  @end group
> 

Cheers,
Carlos.