/sys$common/syshlp/helplib.hlb CC, Run-time functions, strstr  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Locates the first occurrence in the string pointed to by s1 of the
  sequence of characters in the string pointed to by s2.

  Syntax:

       #include <string.h>

       char *strstr(const char *s1, const char *s2);