+void freep(void *arg);
+int compute_word_num(const char *buf, const char *delim, int offset);
+char *safe_strdup(const char *src, size_t len);
+char *key_value_copy(const char *src, size_t len, const char *key);
+int skip_cells(const char *s, size_t cells_to_skip, size_t *result);
+__must_check int strwidth(const char *s, size_t *result);