[DRMAA-WG] C binding -- string lengths

Piotr Domagalski piotr.domagalski at man.poznan.pl
Thu Oct 23 13:45:21 CDT 2008

On Thu, Oct 23, 2008 at 7:49 PM, Roger Brobst <rogerb at cadence.com> wrote:
>> So if error_diag_len is supposed to mean size of the
>> string buffer why sizeof(buf) is not used?
>> Shouldn't it be called error_diag_size to be less confusing?
> Yes, *IF* the intent was to accept the buffer size, then
> the variable error_diag_size would be a better choice.
> Since that's not the intent, it wasn't chosen.

I was just wondering why the buffer size concept was not chosen. I
think it's a lot simpler and less error-prone.

But OK, I understand that the intent was to accept maximum string
length. Now let's get back to the example:

drmaa_init(NULL, buf, sizeof(buf) - 1);

How would you implement the string copying in drmaa_init()? One would
probably use the following code:

drmaa_init(..., char *err_diag, size_t err_diag_len)
  strncpy(err_diag, SRC, err_diag_len)

Now what happens if strlen(SRC) >= sizeof(buf) - 1? Who is responsible
for adding the terminating '\0'?

Piotr Domagalski

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