On Thu, 18 Oct 2001, Roger Larsson wrote:
>On Thursday 18 October 2001 04:01, Leo Mauro wrote:
>> Small fix to Linus's sample code
>>
>> unsigned int so_far = 0;
>> for (;;) {
>> int bytes = read(in, buf+so_far, BUFSIZE-so_far);
>> if (bytes <= 0)
>> break;
>> so_far += bytes;
>> if (so_far < BUFSIZE)
>> continue;
>> write(out, buf, BUFSIZE);
>> - so_far = 0;
>> + so_far -= BUFSIZE;
>> }
>> if (so_far)
>> write(out, buf, so_far);
>>
>> to avoid losing data.
>
>I was close to press the send button but noticed the "BUFSIZE-so_far"
>in the read call, just in time(TM).
>
>If it had not been there you would have needed to copy data from the
>end of buf (from above BUFSIZE) to the beginning of buf too...
>(the required size of buf would have been 2*BUFSIZE)
Since you only ever have BUFSIZE bytes when you write, aren't:
so_far -= BUFSIZE;
and
so_far = 0;
identical? I'd say the assignment to 0 would be faster.
-- George Greer, greerga@m-l.org http://www.m-l.org/~greerga/- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Tue Oct 23 2001 - 21:00:23 EST