Function            endstri - get offset to last char of a string

  Syntax              #include <stringhk.h>
                      (int) endstri(s)

  Prototype in        stringhk.h

  Remarks             gets an offset to the last character of a string.

                      This function is a macro. Strings of length 0 will
                      produce unpredictable results.

  Return value        returns an int offset to the last character in the
                      string s.

  See also            endstrp()