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     The vfprintf, vprintf, and vsprintf functions format and output
     data to <stream>, the standard output, and <buffer>, respectively.
     These functions are similar to their counterparts fprintf, printf,
     and sprintf, but each accepts a pointer to a list of arguments
     instead of an argument list.
 
     The <format> argument has the same form and function as the
     <format> argument for the printf function; see printf for a
     description of <format>.
 
     The <argptr> parameter has type va_list, which is defined in
     VARARGS.H and STDARG.H. The <argptr> parameter points to a list of
     arguments that are converted and output according to the
     corresponding format specifications in the format.
 
     Return Value
 
     The vprintf and vsprintf return value is the number of characters
     written, not counting the terminating null character. If
     successful, the vfprintf return value is the number of characters
     written. If an output error occurs, it is a negative value.
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