Arguments

 

str

   The address of the string that will receive the formatted output.
   It is assumed that this string is large enough to hold the
   output.
 

format_spec

   A pointer to a character string that contains the format
   specification.
 

 . . .

   Optional expressions whose resultant types correspond to
   conversion specifications given in the format specification.

   If no conversion specifications are given, you may omit the
   output sources. Otherwise, the function calls must have at least
   as many output sources as there are conversion specifications,
   and the conversion specifications must match the types of the
   output sources.

   Conversion specifications are matched to output sources in left-
   to-right order. Excess output pointers, if any, are ignored.