Re: *printf: support the ' flag

[Eric Blake]

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According to Bruno Haible on 5/6/2007 9:26 AM:
> This adds support for the grouping flag in the *printf functions, which is
> missing in NetBSD 3.0 and mingw.
> 
> ! dnl 6 = checking whether printf supports the grouping flag...
> ! dnl 7 = checking for snprintf...
> ! dnl 8 = checking whether snprintf truncates the result as in C99...
> ! dnl 9 = checking whether snprintf returns a byte count as in C99...
> ! dnl 10 = checking whether snprintf fully supports the 'n' directive...
> ! dnl 11 = checking whether vsnprintf respects a zero size as in C99...
>   dnl
>   dnl . = yes, # = no.
>   dnl
> ! dnl                              1  2  3  4  5  6  7  8  9 10 11
> ! dnl   Cygwin 2007                .  #  #  .  .  ?  .  .  .  .  ?
> ! dnl   Cygwin 2006                #  #  #  .  .  ?  .  .  .  .  ?

Cygwin 2006 (aka cygwin 1.5.19)      #  #  #  .  .  #  .  .  .  .  .
Cygwin 2007 (aka cygwin 1.5.24)      .  #  #  .  .  .  .  .  .  .  .
Cygwin 1.7.0 (not yet released)      .  ?  .  .  .  .  .  .  .  .  .

I'm still working on getting %a implemented in the newlib library (which
is the basis of cygwin's *printf), but have successfully gotten asnprintf
added to newlib and fixed a number of other printf bugs in cygwin (in
fact, it was my patch to newlib last year that makes cygwin 1.5.24 support
the ' flag).  Another cygwin bug that will be fixed in 1.7.0, but that
might still occur on other platforms with BSD code base:
printf("%#3.f", 0.1) used to result in " 0" instead of the correct " 0.".

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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