VMS Help CC, Language topics, Builtin Functions, Skip Character  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  The _SKPC function locates the first character in a string that
  does not match the target character.

  Syntax:

       unsigned short _SKPC(char __target, unsigned short __length,
                            const char *__string, ... );

  where the optional argument (...) is char **position.