strtok Subroutine

string strtok(const char *s, const char *delim)

strtok parses a string into a sequence of tokens by using delim as the delimiting string . When you first call strtok, specify the string to be parsed in s. In each subsequent call to obtain the next token, specify str as NULL. You can specify a different delimiter for each call. The internal pointer that strtok uses to traverse s is only valid within multiple calls to the same probe. That is, it behaves like an implicit clause-local variable. strtok returns NULL if there are no more tokens.