[PATCH] Faster strn?cat

[Kalle Olavi Niemitalo]

Ondrej Bilka <neleai@seznam.cz> writes:

>  char *
> -STRNCAT (char *s1, const char *s2, size_t n)
> +STRNCAT (char *d, const char *s, size_t n)
>  {

[...]

> +	return 	strncpy(d+strlen(d),s,n);
>  }

Returns the wrong value; should return d always.
Does not append a null character if strlen(s) >= n.
Appends too many null characters if strlen(s) + 1 < n.

It seems test_strncat in string/tester.c should have detected
these errors.  Did you run the test suite?
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