Calculates the starting position of the specified substring in
       the input character string.

1  –  Input

       This functions takes two parameters: a character string and a
       substring.

2  –  Output

       An unsigned integer. If the string is undefined, FN$STR_LOC
       returns the value 0.

3  –  Example

       DTR> DECLARE WOMBAT PIC X(25)
       DTR> WOMBAT = "Wombats have sharp claws."
       DTR> PRINT FN$STR_LOC (WOMBAT,"claws")

        FN$STR
         LOC

                20

       DTR>