char *cescape(const char *s);
char *cunescape(const char *s);
char *cunescape_length(const char *s, size_t length);
+char *cunescape_length_with_prefix(const char *s, size_t length, const char *prefix);
char *xescape(const char *s, const char *bad);
int fd_columns(int fd);
unsigned columns(void);
+unsigned columns_uncached(void);
int fd_lines(int fd);
unsigned lines(void);