bool str_to_double(const char *, double *);
int hexit_value(int c);
+unsigned int hexits_value(const char *s, size_t n, bool *ok);
char *get_cwd(void);
char *dir_name(const char *file_name);
+char *base_name(const char *file_name);
char *abs_file_name(const char *dir, const char *file_name);
void ignore(bool x OVS_UNUSED);