printf vs. vprintf
mercer at npdiss1.StPaul.NCR.COMDanMercer
mercer at npdiss1.StPaul.NCR.COMDanMercer
Thu Aug 16 03:27:35 AEST 1990
In article <411.26c40096 at astro.pc.ab.com> browns at astro.pc.ab.com (Stan Brown, Oak Road Systems) writes:
:In article <1990Aug10.120048.28576 at uni-paderborn.de>, fillg1 at uni-paderborn.de (Michael Illgner) writes:
:> Can anyone describe the advantages (or disadvantages) in using
:> vprintf instead of printf?
:
:I've never used vprintf, and I've been Cing for 7 years now! (Jean-Pierre,
:grand-pere has passed 93 happy years in Choiseul-sur-Mer without once using the
:past anterior verb form. --New Yorker cartoon :-) )
:
:But seriously: If you have written a function that takes a variable number of
:arguments, and inside the function you want to printf those arguments, or all of
:them after the first so many, you would call vprintf to do it. vprintf takes
:exactly two arguments, a char* for the format, and a va_list containing the
:other arguments. That's the only usse I know for vprintf.
:
:So at the risk of oversimplifying: always use printf. vprintf is used only in
:very special circumstances, which you're not likely to meet.
:
:Stan Brown, Oak Road Systems, (216) 371-0043
:The opinions expressed are mine. Mine alone! Nobody else is responsible for
:them or even endorses them--except my cat Dexter, and he signed the power of
:attorney only under my threat to cut off his Cat Chow!
He's absolutely correct. I wrote a menuing system. I wanted to make
it as easy to use as printf, so I wrote a wprintf function (window
print). I use vsprintf to print the string into a buffer, then
parsed the buffer for %B (bold) %N (normal) %R (reverse) and
%D (dim) directives replacing them with the correct terminal sequences.
That's the only time I ever used the va_args capability.
--
Dan Mercer
Reply-To: mercer at npdiss1.StPaul.NCR.COM (Dan Mercer)
"MAN - the only one word oxymoron in the English Language"
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