[m-rev.] for review: Avoid gcc stringop-truncation error.

[Julien Fischer]

On Fri, 17 Jan 2020, Peter Wang wrote:

> Avoid these errors, seen when compiling with a gcc 10 snapshot:
>    error: ‘strncpy’ output truncated before terminating nul copying 3 bytes
>    from a string of the same length [-Werror=stringop-truncation]
>
> runtime/mercury_trace_term.c:
>    Replace use of strncpy with memcpy in a private function.
> ---
> runtime/mercury_trace_term.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/runtime/mercury_trace_term.c b/runtime/mercury_trace_term.c
> index 5e9b3b92e..281193c7c 100644
> --- a/runtime/mercury_trace_term.c
> +++ b/runtime/mercury_trace_term.c
> @@ -496,7 +496,7 @@ MR_copy_str_fragment(const char *original, int string_length)
>     char    *copy;
>
>     copy = MR_malloc(string_length + 1);
> -    strncpy(copy, original, string_length);
> +    memcpy(copy, original, string_length);
>     copy[string_length] = '\0';
>     return copy;
> }

s/memcpy/MR_memcpy/

Looks fine otherwise.

Julien.