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   vsnprintf    ( 3 )

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Ошибки (баги) (Bugs)

Because sprintf() and vsprintf() assume an arbitrarily long
       string, callers must be careful not to overflow the actual space;
       this is often impossible to assure.  Note that the length of the
       strings produced is locale-dependent and difficult to predict.
       Use snprintf() and vsnprintf() instead (or asprintf(3) and
       vasprintf(3)).

       Code such as printf(foo); often indicates a bug, since foo may
       contain a % character.  If foo comes from untrusted user input,
       it may contain %n, causing the printf() call to write to memory
       and creating a security hole.