How to predict size of outcome of vsprintf?

[Leslie Mikesell]

In article <28874 at bu-cs.BU.EDU> bzs at bu-cs.BU.EDU (Barry Shein) writes:

>Ok, there are two thoughts here:

>	1. How to find out the number of characters a printf
>	operation will generate.
>	2. How to limit a printf operation to a buffer size.

Or a third, which is what I usually want:

 3. Give me a pointer to a buffer with my formatted string in it.
    This is trivial after doing operation (1) but shouldn't it
    be possible to do it in one operation?

Les Mikesell