Arguments

 

str

   The address of the character string that provides the input text
   to sscanf.
 

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 can omit the input
   pointers. Otherwise, the function calls must have at least as
   many input pointers as there are conversion specifications, and
   the conversion specifications must match the types of the input
   pointers.

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