Re: [boost] Re: Re: [Q]: What is the recommended logging facilityforboost: log4cpp or ??

From: Ben Hutchings (ben.hutchings_at_[hidden])
Date: 2004-10-28 05:37:20

Maxim Yegorushkin wrote:
> Ben Hutchings <ben.hutchings_at_[hidden]> wrote:
> 
> []
> 
>>> This is one of the reasons I find the *snprintf functions to be pure
>>> evil.  They don't return -1 when the output would be too long, they
>>> return the size they WOULD have written if the buffer was large
>>> enough.
>>
>>
>> That's not evil; it's extremely useful if you want to dynamically
>> allocate a large enough buffer.  All you have to do is check that the
>> return value is less than or equal to the length you passed in.
> 
> 
> Man pages on my RH 9 AS say that a return value that is *equal* or 
> greater than the size of the buffer means that the buffer is too small.

Right, and that agrees with POSIX.  I somehow misread the specification 
first time around.

<snip>
> Shouldn't it be
> 
>     size_t(n) >= sizeof(buf)
> 
> ?

Yes, it should.

Ben.