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Date: Wed, 28 Jul 2010 15:41:49 +0200
From: Rainer Jung <rainer.jung@kippdata.de>
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To: dev@httpd.apache.org
Subject: Re: Error log format configuration syntax
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On 28.07.2010 13:44, Dan Poirier wrote:
> On 2010-07-28 at 03:51, Alex Wulms<alex.wulms@scarlet.be>  wrote:
>
>> Hi,
>>
>> While adding some debug log statements to a module I'm working on, I ran
>> into the problem that ap_log_error (in apache 2.2) does not support %zd
>> or %zu conversion for type_t arguments. This was problematic to make the
>> code compile on both 32 and 64 bit platforms.
>
>> * platform (32-bit or 64-bit). This violates the whole purpose of
>> type_t, which
>> * was introduced in C exactly to provide cross-platform compatibility...
>
> I'm confused.  Neither c89 nor c99 define a type "type_t", as far as I
> can see.
>
> But you might find the *_FMT macro definitions from APR helpful, or else
> explain your problem in more detail?

It seems in C99 a length specifier "z" means: For integer types, causes 
printf to expect a size_t sized integer argument. Citing:

Specifies that a following d, i, o, u, x, or X conversion specifier 
applies to a size_t or the corresponding signed integer type argument; 
or that a following n conversion specifier applies to a pointer to a 
signed integer type corresponding to size_t argument.

At least cross checking on Solaris 10 shows it is actually implemented 
for printf() there.

So: type_t -> size_t and the OP should be able to use APR_SIZE_T_FMT or 
APR_SSIZE_T_FMT (signed) as you suggested.

Regards,

Rainer