runtime/Lib/site-packages/Cython/Includes/posix/strings.pxd

cdef extern from "<strings.h>" nogil:
    int    bcmp(const void *, const void *, size_t)
    void   bcopy(const void *, void *, size_t)
    void   bzero(void *, size_t)
    int    ffs(int)
    char   *index(const char *, int)
    char   *rindex(const char *, int)
    int    strcasecmp(const char *, const char *)
    int    strncasecmp(const char *, const char *, size_t)