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Idiomatic way to find how much space sprintf output would take is
len = snprintf(NULL, 0, ...) + 1;
Once upon a time there'd been libc implementations that blew chunks
on that and somebody had come up with the following "cute" trick:
len = snprintf((char *) &len, 1, ...) + 1;
for doing the same. However, that's unidiomatic, harder to follow
*and* any such libc implementation would violate both C99 and POSIX
(since 2001).
IOW, this kludge is best buried along with such libc implementations,
nevermind getting cargo-culted into newer code. Our vsnprintf() does not
suffer that braindamage, TYVM.
Acked-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
89868773fe