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From:	Brian Inglis <Brian DOT Inglis AT SystematicSw DOT Invalid>
Newsgroups:	comp.os.msdos.djgpp
Subject:	C99 strftime() C locale defaults
Organization:	Systematic Software
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Date:	Mon, 15 Mar 2004 04:03:01 GMT
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To:	djgpp AT delorie DOT com
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I'm in the process of updating DJGPP libc strftime() to properly
support C99 formats and conversions for my own interest.
I have a question about the C locale defaults in the final version of
the C99 Standard. 
Can anyone tell me if the final C99 Standard specifies strftime()
defaults for the C locale different from strftime() in the POSIX
locale from the POSIX 2003 standard (which now has a back reference to
the C Standard)? 
My copy of the official C99 Standard (and e-receipt) got blown away by
a disk crash shortly after downloading, and I'm too superstitious and
cheap to pay and download again, so I'm going from the final committee
distribution C99 FDIS 1999-04 which gives the following as the
strftime() C locale defaults: 

%a the first three characters of %A.
%A one of "Sunday", "Monday", ... , "Saturday".
%b the first three characters of %B.
%B one of "January", "February", ... , "December".
%c equivalent to "%A %B %d %T %Y".
%p one of "am" or "pm".
%r equivalent to "%I:%M:%S %p".
%x equivalent to "%A %B %d %Y".
%X equivalent to %T.
%Z implementation-defined.

The POSIX 2003 strftime() defaults are:
http://www.opengroup.org/onlinepubs/007904975/functions/strftime.html 

%a The first three characters of %A .
%A One of Sunday, Monday, ..., Saturday.
%b The first three characters of %B .
%B One of January, February, ..., December.
%c Equivalent to %a %b %e %T %Y.
%p One of AM or PM.
%r Equivalent to %I:%M:%S %p.
%x Equivalent to %m/%d/%y.
%X Equivalent to %T.
%Z Implementation-defined.

The C locale defaults for %c, %p, %x differ between C99 FDIS and POSIX
2003: 

	C99 FDIS	POSIX 2003
%c	%A %B %d %T %Y	%a %b %e %T %Y
%p	am pm		AM PM
%x	%A %B %d %Y	%m/%d/%y

Should the first column be used or the second column kept as the
defaults? 

-- 
Thanks. Take care, Brian Inglis 	Calgary, Alberta, Canada

Brian DOT Inglis AT CSi DOT com 	(Brian dot Inglis at SystematicSw dot ab dot ca)
    fake address		use address above to reply

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