+char *cfs_strdup(const char *str, u_int32_t flags);
+
+/* safe vsnprintf */
+int cfs_vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
+
+/* safe snprintf */
+int cfs_snprintf(char *buf, size_t size, const char *fmt, ...);
+
+/* trim leading and trailing space characters */
+char *cfs_firststr(char *str, size_t size);
+
+/**
+ * Structure to represent NULL-less strings.
+ */
+struct cfs_lstr {
+ char *ls_str;
+ int ls_len;
+};
+
+/*
+ * Structure to represent \<range_expr\> token of the syntax.
+ */
+struct cfs_range_expr {
+ /*
+ * Link to cfs_expr_list::el_exprs.
+ */
+ cfs_list_t re_link;
+ __u32 re_lo;
+ __u32 re_hi;
+ __u32 re_stride;
+};
+
+struct cfs_expr_list {
+ cfs_list_t el_link;
+ cfs_list_t el_exprs;
+};
+
+static inline int
+cfs_iswhite(char c)
+{
+ switch (c) {
+ case ' ':
+ case '\t':
+ case '\n':
+ case '\r':
+ return 1;
+ default:
+ break;
+ }
+ return 0;
+}
+
+char *cfs_trimwhite(char *str);
+int cfs_gettok(struct cfs_lstr *next, char delim, struct cfs_lstr *res);
+int cfs_str2num_check(char *str, int nob, unsigned *num,
+ unsigned min, unsigned max);
+int cfs_range_expr_parse(struct cfs_lstr *src, unsigned min, unsigned max,
+ int single_tok, struct cfs_range_expr **expr);
+int cfs_expr_list_match(__u32 value, struct cfs_expr_list *expr_list);
+int cfs_expr_list_values(struct cfs_expr_list *expr_list,
+ int max, __u32 **values);
+void cfs_expr_list_free(struct cfs_expr_list *expr_list);
+void cfs_expr_list_print(struct cfs_expr_list *expr_list);
+int cfs_expr_list_parse(char *str, int len, unsigned min, unsigned max,
+ struct cfs_expr_list **elpp);
+void cfs_expr_list_free_list(cfs_list_t *list);
+int cfs_ip_addr_parse(char *str, int len, cfs_list_t *list);
+int cfs_ip_addr_match(__u32 addr, cfs_list_t *list);
+void cfs_ip_addr_free(cfs_list_t *list);
+
+#ifdef __KERNEL__
+#define strtoul(str, endp, base) simple_strtoul(str, endp, base)
+#endif
+