> > 普通は付くが、"n"が効いて切れたときは付かない
> バッファが足りなくて切られた時も\0付くぞ
> size-1の位置が\0になる

snprintf() and vsnprintf() will write at most size-1 of the characters
printed into the output string (the size'th character then gets the ter-
minating `\0'); if the return value is greater than or equal to the size
argument, the string was too short and some of the printed characters
were discarded.

あらほんとだ
こりゃまた失礼

参考：2003/10/20(月)13時08分40秒