"Richard Heathfield" <rjh@see.sig.invalid> a écrit dans le message de news:
qdydnRU5I5AsFZHanZ2dnUVZ8qWhnZ2d@bt.com...
> Tor Rustad said:
>
> <snip>
>
>> I ended up recommending the only one, with 0 work experience, who
>> admitted he didn't knew C well. The seniors, failed big time
>> implementing strncpy() on the blackboard. Very embarrassing.
>
>
> Well, I'm game. Is this a blackboard? Why, yes, it is (although it's
> actually white, but never mind).
>
> Okay, it's an interview, so I'm not allowed to look stuff up. So, off the
> top of my head, strncpy copies no more than n characters from s to t,
> stopping at a null terminator if present, and zero-padding t. It then
> returns t. I can't actually remember whether n is size_t or int. (It ought
> to be size_t, of course, but then so ought the n in fgets.) So I'll risk
> embarrassment by plumping for size_t.
>
> #include <stddef.h>
>
> char *strncpy(char *t, const char *s, size_t n)
> {
> char *u = t;
> while(n > 0 && *s != '\0')
> {
> *t++ = *s++;
> --n;
> }
> while(n-- > 0)
> {
> *t++ = '\0';
> }
> return u;
> }
>
> How did I do? Should I start blushing yet?

Why do you include <stddef.h> instead of <string.h> ?

--
Chqrlie.

Charlie Gordon said:

> "Richard Heathfield" <rjh@see.sig.invalid> a écrit dans le message de
> news: qdydnRU5I5AsFZHanZ2dnUVZ8qWhnZ2d@bt.com...
>>
<strncpy implementation>
>>
>> How did I do? Should I start blushing yet?
>
> Why do you include <stddef.h> instead of <string.h> ?

I needed a definition for size_t. This is defined in <stddef.h> (as well as
in other places), which is why I included it. I didn't see any particular
need to include <string.h>, since it contained nothing I remembered
needing. On reflection, it would have been useful to pick up the
<string.h> prototype of strncpy, just on the off-chance that I
misremembered the n type. (And yes, had I done so, I could have omitted
the <stddef.h> header completely.)

--
Richard Heathfield <http://www.cpax.org.uk>
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999