🚀 go-pugleaf

In article <1992Oct29.082319.7188@saaf.se>, pausch@saaf.se (Paul Schlyter) writes:
> Which brings up the next question: is it legal to invoke va_start more
> than once in the same function, without an invocation of va_end in
> between?
> 
> There are many implementations where this is ok (and where, by the way,
> va_end expands to an empty macro) -- but is it generally legal?

Sure, if you use a different va_list in each call. :-)

I remember extensive discussions of all sorts of "interesting" existing
<varargs.h> implementations as well as some reasonable hypothetical
ones.  My recollection is that the committee intended to allow all of
these techniques as valid implementations of <stdarg.h>, which would
imply that va_start and va_end must be paired and must appear in the
same scope.  If you want your code to be maximally portable, then that
is the approach I would take.

The standard does not seem to require such caution, however.  The
description of va_start does not require a matching va_end, let alone
one in the same scope.  The only requirement appears to be that, if
va_start is called within a function, va_end be called before that
function returns.  This is probably worthy of a formal request for
interpretation.
----
Larry Jones, SDRC, 2000 Eastman Dr., Milford, OH  45150-2789  513-576-2070
larry.jones@sdrc.com  or  ...uunet!sdrc!larry.jones
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