Re: [PATCH v5 05/15] pkt-line: add packet_write_gently_fmt()

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> On 10 Aug 2016, at 15:43, Jeff King <peff@xxxxxxxx> wrote:
> 
> On Wed, Aug 10, 2016 at 03:04:01PM +0200, larsxschneider@xxxxxxxxx wrote:
> 
>> +int packet_write_gently_fmt(int fd, const char *fmt, ...)
>> +{
>> +	static struct strbuf buf = STRBUF_INIT;
>> +	va_list args;
>> +
>> +	strbuf_reset(&buf);
>> +	va_start(args, fmt);
>> +	format_packet(1, &buf, fmt, args);
>> +	va_end(args);
>> +	packet_trace(buf.buf + 4, buf.len - 4, 1);
>> +	return (write_in_full(fd, buf.buf, buf.len) == buf.len ? 0 : -1);
>> +}
> 
> Could the end of this function just be:
> 
>  return packet_write_gently(fd, buf.buf, buf.len);
> 
> ? I guess we'd prefer to avoid that, because it incurs an extra
> memmove() of the data.

I don't think the memmove would be that expensive. However, format_packet()
already creates the packet_header and packet_write_gently would do the same
again, no?


> Similarly, I'd think this could share code with the non-gentle form
> (which should be able to just call this and die() if returns an error).
> Though sometimes the va_list transformation makes that awkward.

Yeah, the code duplication annoyed me, too. va_list was the reason I did it
that way. Do you think that is something that needs to be addressed in the
series?

Thanks,
Lars
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