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─────Run-Time Library───────────────────────────────────────────────────────
 
     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 _vsnprintf function differs from vsprintf in that it writes
     not more than <count> bytes to <buffer>.
 
     The <format> argument has the same form and function as the
     <format> argument for the printf function.
     See: ◄Format Specifiers►
          ◄Escape Sequences►
 
     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 return value for vprintf, vsprintf, and _vsnprintf is the
     number of characters written, not counting the terminating null
     character. For _vsnprintf, if the number of bytes to write exceeds
     <buffer>, then <count> bytes are written and -1 is returned. 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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