An implementation of the standard vsprintf() function which supports positional parameters, as specified in the Single Unix Specification.
the buffer to hold the output.
a standard printf() format string, but notice [string precision pitfalls][string-precision]
the list of arguments to insert in the output.
Return: the number of bytes printed.
2.2
See Implementation
An implementation of the standard vsprintf() function which supports positional parameters, as specified in the Single Unix Specification.