unctrl(), keyname(), filter(), use_env(), putwin(), getwin(), delay_output(), flushinp() - miscellaneous curses utility routines


#include <curses.h>

char *unctrl(chtype c); char *keyname(int c); void filter(void); void use_env(char bool); int putwin(WINDOW *win, FILE *filep); WINDOW *getwin(FILE *filep); int delay_output(int ms); int flushinp(void);


The unctrl(3) macro expands to a character string which is a printable representation of the character c. Control characters are displayed in the ^X notation. Printing characters are displayed as is.

The keyname(3) routine returns a character string corresponding to the key c.

The filter(3) routine, if used, must be called before initscr(3) or newterm(3) are called. The effect is that, during those calls, LINES is set to 1; the capabilities clear, cup, cud, cud1, cuu1, cuu, vpa are disabled; and the home string is set to the value of cr.

The use_env(3) routine, if used, is called before initscr(3) or newterm(3) are called. When called with FALSE as an argument, the values of lines and columns specified in the terminfo database will be used, even if the environment variables LINES and COLUMNS (used by default) are set, or if curses is running in a window (in which case default behavior would be to use the window size if LINES and COLUMNS are not set).

The putwin(3) routine writes all data associated with window win into the file to which filep points. This information can be later retrieved using the getwin(3) function.

The getwin(3) routine reads window related data stored in the file by putwin(3). The routine then creates and initializes a new window using that data. It returns a pointer to the new window.

The delay_output(3) routine inserts an ms millisecond pause in output. This routine should not be used extensively because padding characters are used rather than a CPU pause.

The flushinp(3) routine throws away any typeahead that has been typed by the user and has not yet been read by the program.


Except for flushinp(3), routines that return an integer return ERR upon failure and OK (SVr4 specifies only "an integer value other than ERR") upon successful completion.

flushinp(3) always returns OK.

Routines that return pointers return NULL on error.


The XSI Curses standard, Issue 4 describes these functions.

The SVr4 documentation describes the action of filter(3) only in the vaguest terms. The description here is adapted from the XSI Curses standard (which erroneously fails to describe the disabling of cuu).


Note that unctrl(3) is a macro, which is defined in <unctrl.h>.