bug#8435: misuse of error ("...%d...", ...) on 64-bit hosts

[Eli Zaretskii]

> Date: Sat, 09 Apr 2011 11:24:08 -0700
> From: Paul Eggert <eggert@cs.ucla.edu>
> CC: 8435@debbugs.gnu.org
> 
> it's wasteful to spend time maintaining a buggy near-copy of
> vsnprintf.  It's better software engineering practice to use
> vsnprintf instead.

How about if we take vsnprintf from some library, e.g. glibc or
gnulib, and add to it code to support the two features that were at
the time added to doprnt (i.e., avoid splitting a multi-byte
character, and convert a multi-byte sequence to a wide character when
%c conversion is used)?