Re: [libmicrohttpd] How MHD_VERSION works and how to get the "x.y.z-r" string from it?

[Christian Grothoff]

Hi Fermin,

There isn't a sane way to convert the MHD_VERSION string to the
x.y.z-string, and it's largely by accident in that we failed to properly
count in HEX. We are likely to fix that once we go for 1.0. OTOH, the
idea of the MHD_VERSION string was to do stuff like

#if MHD_VERSION > 0x44
bug-fixed-or-feature-available
#else
workaround-or-warn
#endif

and not to 'show' the version as a human-readable string. And for that,
the bug should not matter...

Happy hacking!

Christian

On 10/27/20 7:23 PM, FERMIN GALAN MARQUEZ wrote:
> Hi,
> 
>  
> 
> The MHD_VERSION is defined as follows
> 
>  
> 
> /**
> 
> * Current version of the library.
> 
> * 0x01093001 = 1.9.30-1.
> 
> */
> 
> #define MHD_VERSION 0x00097000
> 
>  
> 
> Thus, it seems that by blocks of two digits, each block defines one of
> the four digits of the usual x.y.z-r version number.
> 
>  
> 
> Thus, for instance in this case:
> 
>  
> 
> 00 -> 0. ..
> 
> 09 -> .. .9. ..
> 
> 70 -> .. .70
> 
> 00 -> ..-0
> 
>  
> 
> resulting in 0.9.70-0. So far so good.
> 
>  
> 
> However, what has surprised me is that the blocks are interpreted
> literary instead of hexadecimal (as 0x0 should mean). For instance 70 in
> hexadecimal is 112 (which would lead to 0.9.112-0 in this case).
> 
>  
> 
> I have two questions regarding this, please:
> 
>  
> 
> ·         Why does it work this way? Maybe it’s obvious, but for me is a
> bit weird J
> 
> ·         It seems there is no way of getting the “x.y.z-r” text string
> directly from the libmicrohttpd functions (please, tell me if I’m wrong…
> I could have missed some function for that provided by the library
> itself). It would be great if somebody hat has faced before the same
> problem could share the code snipped to get the “z.y.z-r” text string
> from the MHD_VERSION hex number :)
> 
>  
> 
> Thank you very much in advance!
> 
>  
> 
> Best regards,
> 
>  
> 
> ------
> 
> Fermín
> 
> 
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