ncurses(3NCURSES) ncurses(3NCURSES)
NAME ncurses - CRT screen handling and optimization package
SYNOPSIS #include <curses.h>
DESCRIPTION The ncurses library routines give the user a terminal- independent method of updating character screens with rea- sonable optimization. This implementation is ``new curses'' (ncurses) and is the approved replacement for 4.4BSD classic curses, which has been discontinued.
The ncurses routines emulate the ncurses(3NCURSES) library of System V Release 4 UNIX, and the XPG4 curses standard (XSI curses) but the ncurses library is freely redis- tributable in source form. Differences from the SVr4 curses are summarized under the EXTENSIONS and BUGS sec- tions below and described in detail in the EXTENSIONS and BUGS sections of individual man pages.
A program using these routines must be linked with the -lncurses option, or (if it has been generated) with the debugging library -lncurses_g. (Your system integrator may also have installed these libraries under the names -lcurses and -lcurses_g.) The ncurses_g library generates trace logs (in a file called 'trace' in the current direc- tory) that describe curses actions.
The ncurses package supports: overall screen, window and pad manipulation; output to windows and pads; reading ter- minal input; control over terminal and curses input and output options; environment query routines; color manipu- lation; use of soft label keys; terminfo capabilities; and access to low-level terminal-manipulation routines.
To initialize the routines, the routine initscr or newterm must be called before any of the other routines that deal with windows and screens are used. The routine endwin must be called before exiting. To get character-at-a-time input without echoing (most interactive, screen oriented programs want this), the following sequence should be used:
initscr(); cbreak(); noecho();
Most programs would additionally use the sequence:
nonl(); intrflush(stdscr, FALSE); keypad(stdscr, TRUE);
Before a curses program is run, the tab stops of the ter- minal should be set and its initialization strings, if defined, must be output. This can be done by executing the tput init command after the shell environment variable TERM has been exported. tset(1) is usually responsible for doing this. [See terminfo(5) for further details.]
Beware: the terminal your program is running may or may not have the features you expect. Ncurses makes no attempt to check available features in advance. This is upto the programmer.
The ncurses library permits manipulation of data struc- tures, called windows, which can be thought of as two- dimensional arrays of characters representing all or part of a CRT screen. A default window called stdscr, which is the size of the terminal screen, is supplied. Others may be created with newwin.
Note that curses does not handle overlapping windows, that's done by the panel(3CURSES) library. This means that you can either use stdscr or divide the screen into tiled windows and not using stdscr at all. Mixing the two will result in unpredictable, and undesired, effects.
Windows are referred to by variables declared as WINDOW *. These data structures are manipulated with routines described here and elsewhere in the ncurses manual pages. Among which the most basic routines are move and addch. More general versions of these routines are included with names beginning with w, allowing the user to specify a window. The routines not beginning with w affect stdscr.)
After using routines to manipulate a window, refresh is called, telling curses to make the user's CRT screen look like stdscr. The characters in a window are actually of type chtype, (character and attribute data) so that other information about the character may also be stored with each character.
Special windows called pads may also be manipulated. These are windows which are not constrained to the size of the screen and whose contents need not be completely dis- played. See pad(3NCURSES) for more information.
In addition to drawing characters on the screen, video attributes and colors may be supported, causing the char- acters to show up in such modes as underlined, in reverse video, or in color on terminals that support such display enhancements. Line drawing characters may be specified to be output. On input, curses is also able to translate arrow and function keys that transmit escape sequences into single values. The video attributes, line drawing characters, and input values use names, defined in <curses.h>, such as A_REVERSE, ACS_HLINE, and KEY_LEFT.
If the environment variables LINES and COLUMNS are set, or if the program is executing in a window environment, line and column information in the environment will override information read by terminfo. This would effect a program running in an AT&T 630 layer, for example, where the size of a screen is changeable (see ENVIRONMENT).
If the environment variable TERMINFO is defined, any pro- gram using curses checks for a local terminal definition before checking in the standard place. For example, if TERM is set to att4424, then the compiled terminal defini- tion is found in
/usr/share/terminfo/a/att4424.
(The a is copied from the first letter of att4424 to avoid creation of huge directories.) However, if TERMINFO is set to $HOME/myterms, curses first checks
$HOME/myterms/a/att4424,
and if that fails, it then checks
/usr/share/terminfo/a/att4424.
This is useful for developing experimental definitions or when write permission in /usr/share/terminfo is not avail- able.
The integer variables LINES and COLS are defined in <curses.h> and will be filled in by initscr with the size of the screen. The constants TRUE and FALSE have the val- ues 1 and 0, respectively.
The curses routines also define the WINDOW * variable curscr which is used for certain low-level operations like clearing and redrawing a screen containing garbage. The curscr can be used in only a few routines.
Routine and Argument Names Many curses routines have two or more versions. The rou- tines prefixed with w require a window argument. The rou- tines prefixed with p require a pad argument. Those with- out a prefix generally use stdscr.
The routines prefixed with mv require a y and x coordinate to move to before performing the appropriate action. The mv routines imply a call to move before the call to the other routine. The coordinate y always refers to the row (of the window), and x always refers to the column. The upper left-hand corner is always (0,0), not (1,1).
The routines prefixed with mvw take both a window argument and x and y coordinates. The window argument is always specified before the coordinates.
In each case, win is the window affected, and pad is the pad affected; win and pad are always pointers to type WIN- DOW.
Option setting routines require a Boolean flag bf with the value TRUE or FALSE; bf is always of type bool. The vari- ables ch and attrs below are always of type chtype. The types WINDOW, SCREEN, bool, and chtype are defined in <curses.h>. The type TERMINAL is defined in <term.h>. All other arguments are integers.
Routine Name Index The following table lists each curses routine and the name of the manual page on which it is described. Routines flagged with `*' are ncurses-specific, not described by XPG4 or present in SVr4.
curses Routine Name Manual Page Name -------------------------------------------------- COLOR_PAIR color(3NCURSES) PAIR_NUMBER attr(3NCURSES) _nc_tracebits trace(3NCURSES)* _traceattr trace(3NCURSES)* _traceattr2 trace(3NCURSES)* _tracechar trace(3NCURSES)* _tracechtype trace(3NCURSES)* _tracechtype2 trace(3NCURSES)*
_tracedump trace(3NCURSES)* _tracef trace(3NCURSES)* _tracemouse trace(3NCURSES)* addch addch(3NCURSES) addchnstr addchstr(3NCURSES) addchstr addchstr(3NCURSES) addnstr addstr(3NCURSES) addstr addstr(3NCURSES) assume_default_colors default_colors(3NCURSES)* attr_get attr(3NCURSES) attr_off attr(3NCURSES) attr_on attr(3NCURSES) attr_set attr(3NCURSES) attroff attr(3NCURSES) attron attr(3NCURSES) attrset attr(3NCURSES) baudrate termattrs(3NCURSES) beep beep(3NCURSES) bkgd bkgd(3NCURSES) bkgdset bkgd(3NCURSES) border border(3NCURSES) box border(3NCURSES) can_change_color color(3NCURSES) cbreak inopts(3NCURSES) chgat attr(3NCURSES) clear clear(3NCURSES) clearok outopts(3NCURSES) clrtobot clear(3NCURSES) clrtoeol clear(3NCURSES) color_content color(3NCURSES) color_set attr(3NCURSES) copywin overlay(3NCURSES) curs_set kernel(3NCURSES) curses_version extensions(3NCURSES)* def_prog_mode kernel(3NCURSES) def_shell_mode kernel(3NCURSES) define_key define_key(3NCURSES)* del_curterm terminfo(3NCURSES) delay_output util(3NCURSES) delch delch(3NCURSES) deleteln deleteln(3NCURSES) delscreen initscr(3NCURSES) delwin window(3NCURSES) derwin window(3NCURSES) doupdate refresh(3NCURSES) dupwin window(3NCURSES) echo inopts(3NCURSES) echochar addch(3NCURSES) endwin initscr(3NCURSES) erase clear(3NCURSES) erasechar termattrs(3NCURSES) filter util(3NCURSES) flash beep(3NCURSES) flushinp util(3NCURSES) getbegyx getyx(3NCURSES) getbkgd bkgd(3NCURSES) getch getch(3NCURSES) getmaxyx getyx(3NCURSES) getmouse mouse(3NCURSES)* getnstr getstr(3NCURSES) getparyx getyx(3NCURSES) getstr getstr(3NCURSES) getsyx kernel(3NCURSES) getwin util(3NCURSES) getyx getyx(3NCURSES)
halfdelay inopts(3NCURSES) has_colors color(3NCURSES) has_ic termattrs(3NCURSES) has_il termattrs(3NCURSES) has_key getch(3NCURSES)* hline border(3NCURSES) idcok outopts(3NCURSES) idlok outopts(3NCURSES) immedok outopts(3NCURSES) inch inch(3NCURSES) inchnstr inchstr(3NCURSES) inchstr inchstr(3NCURSES) init_color color(3NCURSES) init_pair color(3NCURSES) initscr initscr(3NCURSES) innstr instr(3NCURSES) insch insch(3NCURSES) insdelln deleteln(3NCURSES) insertln deleteln(3NCURSES) insnstr insstr(3NCURSES) insstr insstr(3NCURSES) instr instr(3NCURSES) intrflush inopts(3NCURSES) is_linetouched touch(3NCURSES) is_wintouched touch(3NCURSES) isendwin initscr(3NCURSES) keybound keybound(3NCURSES)* keyname util(3NCURSES) keyok keyok(3NCURSES)* keypad inopts(3NCURSES) killchar termattrs(3NCURSES) leaveok outopts(3NCURSES) longname termattrs(3NCURSES) mcprint print(3NCURSES)* meta inopts(3NCURSES) mouse_trafo mouse(3NCURSES)* mouseinterval mouse(3NCURSES)* mousemask mouse(3NCURSES)* move move(3NCURSES) mvaddch addch(3NCURSES) mvaddchnstr addchstr(3NCURSES) mvaddchstr addchstr(3NCURSES) mvaddnstr addstr(3NCURSES) mvaddstr addstr(3NCURSES) mvchgat attr(3NCURSES) mvcur terminfo(3NCURSES) mvdelch delch(3NCURSES) mvderwin window(3NCURSES) mvgetch getch(3NCURSES) mvgetnstr getstr(3NCURSES) mvgetstr getstr(3NCURSES) mvhline border(3NCURSES) mvinch inch(3NCURSES) mvinchnstr inchstr(3NCURSES) mvinchstr inchstr(3NCURSES) mvinnstr instr(3NCURSES) mvinsch insch(3NCURSES) mvinsnstr insstr(3NCURSES) mvinsstr insstr(3NCURSES) mvinstr instr(3NCURSES) mvprintw printw(3NCURSES) mvscanw scanw(3NCURSES) mvvline border(3NCURSES) mvwaddch addch(3NCURSES) mvwaddchnstr addchstr(3NCURSES)
mvwaddchstr addchstr(3NCURSES) mvwaddnstr addstr(3NCURSES) mvwaddstr addstr(3NCURSES) mvwchgat attr(3NCURSES) mvwdelch delch(3NCURSES) mvwgetch getch(3NCURSES) mvwgetnstr getstr(3NCURSES) mvwgetstr getstr(3NCURSES) mvwhline border(3NCURSES) mvwin window(3NCURSES) mvwinch inch(3NCURSES) mvwinchnstr inchstr(3NCURSES) mvwinchstr inchstr(3NCURSES) mvwinnstr instr(3NCURSES) mvwinsch insch(3NCURSES) mvwinsnstr insstr(3NCURSES) mvwinsstr insstr(3NCURSES) mvwinstr instr(3NCURSES) mvwprintw printw(3NCURSES) mvwscanw scanw(3NCURSES) mvwvline border(3NCURSES) napms kernel(3NCURSES) newpad pad(3NCURSES) newterm initscr(3NCURSES) newwin window(3NCURSES) nl outopts(3NCURSES) nocbreak inopts(3NCURSES) nodelay inopts(3NCURSES) noecho inopts(3NCURSES) nonl outopts(3NCURSES) noqiflush inopts(3NCURSES) noraw inopts(3NCURSES) notimeout inopts(3NCURSES) overlay overlay(3NCURSES) overwrite overlay(3NCURSES) pair_content color(3NCURSES) pechochar pad(3NCURSES) pnoutrefresh pad(3NCURSES) prefresh pad(3NCURSES) printw printw(3NCURSES) putp terminfo(3NCURSES) putwin util(3NCURSES) qiflush inopts(3NCURSES) raw inopts(3NCURSES) redrawwin refresh(3NCURSES) refresh refresh(3NCURSES) reset_prog_mode kernel(3NCURSES) reset_shell_mode kernel(3NCURSES) resetty kernel(3NCURSES) resizeterm resizeterm(3NCURSES)* restartterm terminfo(3NCURSES) ripoffline kernel(3NCURSES) savetty kernel(3NCURSES) scanw scanw(3NCURSES) scr_dump scr_dump(3NCURSES) scr_init scr_dump(3NCURSES) scr_restore scr_dump(3NCURSES) scr_set scr_dump(3NCURSES) scrl scroll(3NCURSES) scroll scroll(3NCURSES) scrollok outopts(3NCURSES) set_curterm terminfo(3NCURSES) set_term initscr(3NCURSES) setscrreg outopts(3NCURSES) setsyx kernel(3NCURSES)
setterm terminfo(3NCURSES) setupterm terminfo(3NCURSES) slk_attr slk(3NCURSES)* slk_attr_off slk(3NCURSES) slk_attr_on slk(3NCURSES) slk_attr_set slk(3NCURSES) slk_attroff slk(3NCURSES) slk_attron slk(3NCURSES) slk_attrset slk(3NCURSES) slk_clear slk(3NCURSES) slk_color slk(3NCURSES) slk_init slk(3NCURSES) slk_label slk(3NCURSES) slk_noutrefresh slk(3NCURSES) slk_refresh slk(3NCURSES) slk_restore slk(3NCURSES) slk_set slk(3NCURSES) slk_touch slk(3NCURSES) standend attr(3NCURSES) standout attr(3NCURSES) start_color color(3NCURSES) subpad pad(3NCURSES) subwin window(3NCURSES) syncok window(3NCURSES) termattrs termattrs(3NCURSES) termname termattrs(3NCURSES) tgetent termcap(3NCURSES) tgetflag termcap(3NCURSES) tgetnum termcap(3NCURSES) tgetstr termcap(3NCURSES) tgoto termcap(3NCURSES) tigetflag terminfo(3NCURSES) tigetnum terminfo(3NCURSES) tigetstr terminfo(3NCURSES) timeout inopts(3NCURSES) touchline touch(3NCURSES) touchwin touch(3NCURSES) tparm terminfo(3NCURSES) tputs termcap(3NCURSES) tputs terminfo(3NCURSES) trace trace(3NCURSES)* typeahead inopts(3NCURSES) unctrl util(3NCURSES) ungetch getch(3NCURSES) ungetmouse mouse(3NCURSES)* untouchwin touch(3NCURSES) use_default_colors default_colors(3NCURSES)* use_env util(3NCURSES) use_extended_names extensions(3NCURSES)* vidattr terminfo(3NCURSES) vidputs terminfo(3NCURSES) vline border(3NCURSES) vw_printw printw(3NCURSES) vw_scanw scanw(3NCURSES) vwprintw printw(3NCURSES) vwscanw scanw(3NCURSES) waddch addch(3NCURSES) waddchnstr addchstr(3NCURSES) waddchstr addchstr(3NCURSES) waddnstr addstr(3NCURSES) waddstr addstr(3NCURSES) wattr_get attr(3NCURSES) wattr_off attr(3NCURSES) wattr_on attr(3NCURSES) wattr_set attr(3NCURSES)
wattroff attr(3NCURSES) wattron attr(3NCURSES) wattrset attr(3NCURSES) wbkgd bkgd(3NCURSES) wbkgdset bkgd(3NCURSES) wborder border(3NCURSES) wchgat attr(3NCURSES) wclear clear(3NCURSES) wclrtobot clear(3NCURSES) wclrtoeol clear(3NCURSES) wcolor_set attr(3NCURSES) wcursyncup window(3NCURSES) wdelch delch(3NCURSES) wdeleteln deleteln(3NCURSES) wechochar addch(3NCURSES) wenclose mouse(3NCURSES)* werase clear(3NCURSES) wgetch getch(3NCURSES) wgetnstr getstr(3NCURSES) wgetstr getstr(3NCURSES) whline border(3NCURSES) winch inch(3NCURSES) winchnstr inchstr(3NCURSES) winchstr inchstr(3NCURSES) winnstr instr(3NCURSES) winsch insch(3NCURSES) winsdelln deleteln(3NCURSES) winsertln deleteln(3NCURSES) winsnstr insstr(3NCURSES) winsstr insstr(3NCURSES) winstr instr(3NCURSES) wmouse_trafo mouse(3NCURSES)* wmove move(3NCURSES) wnoutrefresh refresh(3NCURSES) wprintw printw(3NCURSES) wredrawln refresh(3NCURSES) wrefresh refresh(3NCURSES) wresize wresize(3NCURSES)* wscanw scanw(3NCURSES) wscrl scroll(3NCURSES) wsetscrreg outopts(3NCURSES) wstandend attr(3NCURSES) wstandout attr(3NCURSES) wsyncdown window(3NCURSES) wsyncup window(3NCURSES) wtimeout inopts(3NCURSES) wtouchln touch(3NCURSES) wvline border(3NCURSES)
RETURN VALUE Routines that return an integer return ERR upon failure and an integer value other than ERR upon successful com- pletion, unless otherwise noted in the routine descrip- tions.
All macros return the value of the w version, except setscrreg, wsetscrreg, getyx, getbegyx, getmaxyx. The return values of setscrreg, wsetscrreg, getyx, getbegyx, and getmaxyx are undefined (i.e., these should not be used as the right-hand side of assignment statements).
Routines that return pointers return NULL on error.
ENVIRONMENT The following environment symbols are useful for customiz- ing the runtime behavior of the ncurses library. The most important ones have been already discussed in detail.
BAUDRATE The debugging library checks this environment symbol when the application has redirected output to a file. The symbol's numeric value is used for the baudrate. If no value is found ncurses uses 9600. This allows testers to construct repeatable test-cases that take into account costs that depend on baudrate.
CC When set, change occurrences of the command_character (i.e., the cmdch capability) of the loaded terminfo entries to the value of this symbol. Very few ter- minfo entries provide this feature.
COLUMNS Specify the width of the screen in characters. Applications running in a windowing environment usu- ally are able to obtain the width of the window in which they are executing. If neither the $COLUMNS value nor the terminal's screen size is available, ncurses uses the size which may be specified in the terminfo database (i.e., the cols capability).
It is important that your application use a correct size for the screen. However, this is not always possible because your application may be running on a host which does not honor NAWS (Negotiations About Window Size), or because you are temporarily running as another user.
Either COLUMNS or LINES symbols may be specified independently. This is mainly useful to circumvent legacy misfeatures of terminal descriptions, e.g., xterm which commonly specifies a 65 line screen. For best results, lines and cols should not be specified in a terminal description for terminals which are run as emulations.
Use the use_env function to disable this feature.
ESCDELAY Specifies the total time, in milliseconds, for which ncurses will await a character sequence, e.g., a function key. The default value, 1000 milliseconds, is enough for most uses. However, it is made a vari- able to accommodate unusual applications.
The most common instance where you may wish to change this value is to work with slow hosts, e.g., running on a network. If the host cannot read characters rapidly enough, it will have the same effect as if the terminal did not send characters rapidly enough. The library will still see a timeout.
Note that xterm mouse events are built up from char- acter sequences received from the xterm. If your application makes heavy use of multiple-clicking, you may wish to lengthen this default value because the timeout applies to the composed multi-click event as well as the individual clicks.
HOME Tells ncurses where your home directory is. That is where it may read and write auxiliary terminal descriptions:
$HOME/.termcap $HOME/.terminfo
LINES Like COLUMNS, specify the height of the screen in characters. See COLUMNS for a detailed description.
MOUSE_BUTTONS_123 This applies only to the OS/2 EMX port. It specifies the order of buttons on the mouse. OS/2 numbers a 3-button mouse inconsistently from other platforms:
1 = left 2 = right 3 = middle.
This symbol lets you customize the mouse. The symbol must be three numeric digits 1-3 in any order, e.g., 123 or 321. If it is not specified, ncurses uses 132.
NCURSES_NO_PADDING Most of the terminal descriptions in the terminfo database are written for real "hardware" terminals. Many people use terminal emulators which run in a windowing environment and use curses-based applica- tions. Terminal emulators can duplicate all of the important aspects of a hardware terminal, but they do not have the same limitations. The chief limitation of a hardware terminal from the standpoint of your application is the management of dataflow, i.e., tim- ing. Unless a hardware terminal is interfaced into a terminal concentrator (which does flow control), it (or your application) must manage dataflow, prevent- ing overruns. The cheapest solution (no hardware cost) is for your program to do this by pausing after operations that the terminal does slowly, such as clearing the display.
As a result, many terminal descriptions (including the vt100) have delay times embedded. You may wish to use these descriptions, but not want to pay the performance penalty.
Set the NCURSES_NO_PADDING symbol to disable all but mandatory padding. Mandatory padding is used as a part of special control sequences such as flash.
NCURSES_NO_SETBUF Normally ncurses enables buffered output during ter- minal initialization. This is done (as in SVr4 curses) for performance reasons. For testing pur- poses, both of ncurses and certain applications, this feature is made optional. Setting the NCURSES_NO_SETBUF variable disables output buffering, leaving the output in the original (usually line buffered) mode.
NCURSES_TRACE During initialization, the ncurses debugging library checks the NCURSES_TRACE symbol. If it is defined, to a numeric value, ncurses calls the trace function, using that value as the argument.
The argument values, which are defined in curses.h, provide several types of information. When running with traces enabled, your application will write the file trace to the current directory.
TERM Denotes your terminal type. Each terminal type is distinct, though many are similar.
TERMCAP If the ncurses library has been configured with term- cap support, ncurses will check for a terminal's description in termcap form if it is not available in the terminfo database.
The TERMCAP symbol contains either a terminal description (with newlines stripped out), or a file name telling where the information denoted by the TERM symbol exists. In either case, setting it directs ncurses to ignore the usual place for this information, e.g., /etc/termcap.
TERMINFO Overrides the directory in which ncurses searches for your terminal description. This is the simplest, but not the only way to change the list of directories. The complete list of directories in order follows:
- the last directory to which ncurses wrote, if any, is searched first.
- the directory specified by the TERMINFO symbol
- $HOME/.terminfo
- directories listed in the TERMINFO_DIRS symbol
- one or more directories whose names are configured and compiled into the ncurses library, e.g., /usr/share/terminfo
TERMINFO_DIRS Specifies a list of directories to search for termi- nal descriptions. The list is separated by colons (i.e., ":") on Unix, semicolons on OS/2 EMX. All of the terminal descriptions are in terminfo form, which makes a subdirectory named for the first letter of the terminal names therein.
TERMPATH If TERMCAP does not hold a file name then ncurses checks the TERMPATH symbol. This is a list of file- names separated by spaces or colons (i.e., ":") on Unix, semicolons on OS/2 EMX. If the TERMPATH symbol is not set, ncurses looks in the files /etc/termcap, /usr/share/misc/termcap and $HOME/.termcap, in that order.
The library may be configured to disregard the following variables when the current user is the superuser (root), or if the application uses setuid or setgid permissions: $TERMINFO, $TERMINFO_DIRS, $TERMPATH, as well as $HOME.
FILES /usr/share/tabset directory containing initialization files for the terminal capability database /usr/share/terminfo ter- minal capability database
SEE ALSO terminfo(5) and 3X pages whose names begin "curs_" for detailed routine descriptions.
EXTENSIONS The ncurses library can be compiled with an option (-DUSE_GETCAP) that falls back to the old-style /etc/term- cap file if the terminal setup code cannot find a terminfo entry corresponding to TERM. Use of this feature is not recommended, as it essentially includes an entire termcap compiler in the ncurses startup code, at significant cost in core and startup cycles.
The ncurses library includes facilities for capturing mouse events on certain terminals (including xterm). See the mouse(3NCURSES) manual page for details.
The ncurses library includes facilities for responding to window resizing events, e.g., when running in an xterm. See the resizeterm(3NCURSES) and wresize(3NCURSES) manual pages for details. In addition, the library may be con- figured with a SIGWINCH handler.
The ncurses library extends the fixed set of function key capabilities of terminals by allowing the application designer to define additional key sequences at runtime. See the define_key(3NCURSES) and keyok(3NCURSES) manual pages for details.
The ncurses library can exploit the capabilities of termi- nals which implement the ISO-6429 SGR 39 and SGR 49 con- trols, which allow an application to reset the terminal to its original foreground and background colors. From the users' perspective, the application is able to draw col- ored text on a background whose color is set indepen- dently, providing better control over color contrasts. See the use_default_colors(3X) manual page for details.
The ncurses library includes a function for directing application output to a printer attached to the terminal device. See the print(3NCURSES) manual page for details.
PORTABILITY The ncurses library is intended to be BASE-level confor- mant with the XSI Curses standard. Certain portions of the EXTENDED XSI Curses functionality (including color support) are supported. The following EXTENDED XSI Curses calls in support of wide (multibyte) characters are not yet implemented: add_wch, add_wchnstr, add_wchstr, addnw- str, addwstr, bkgrnd, bkgrndset, border_set, box_set, echo_wchar, erasewchar, get_wch, get_wstr, getbkgrnd, getcchar, getn_wstr, getwchtype, hline_set, in_wch, in_wchnstr, in_wchstr, innwstr, ins_nwstr, ins_wch, ins_wstr, inwchnstr, inwchstr, inwstr, key_name, kill- wchar, mvadd_wch, mvadd_wchnstr, mvadd_wchstr, mvaddnwstr, mvaddwstr, mvget_wch, mvget_wstr, mvgetn_wstr, mvh- line_set, mvin_wch, mvinnwstr, mvins_nwstr, mvins_wch, mvins_wstr, mvinwchnstr, mvinwchstr, mvinwchstr, mvinwstr, mvvline_set, mvwadd_wch, mvwadd_wchnstr, mvwadd_wchstr, mvwaddnwstr, mvwaddwstr, mvwget_ch, mvwget_wch, mvwget_wstr, mvwgetn_wstr, mvwhline_set, mvwin_wch, mvwin_wchnstr, mvwin_wchstr, mvwinnwstr, mvwins_nwstr, mvwins_wch, mvwins_wstr, mvwinwchnstr. mvwinwstr, mvwv- line_set, pecho_wchar, setcchar, slk_wset, term_attrs, unget_wch, vhline_set, vid_attr, vid_puts, vline_set, wadd_wch, wadd_wchnstr, wadd_wchstr, waddnwstr, waddwstr, waddwstr, wbkgrnd, wbkgrndset, wbkgrndset, wborder_set, wecho_wchar, wecho_wchar, wget_wch, wget_wstr, wgetbkgrnd, wgetn_wstr, whline_set, win_wch, win_wchnstr, win_wchstr, winnwstr, wins_nwstr, wins_wch, wins_wstr, winwchnstr, winwchstr, winwstr, wunctrl, wvline_set,
A small number of local differences (that is, individual differences between the XSI Curses and ncurses calls) are described in PORTABILITY sections of the library man pages.
The routine has_key is not part of XPG4, nor is it present in SVr4. See the getch(3NCURSES) manual page for details.
The routine slk_attr is not part of XPG4, nor is it pre- sent in SVr4. See the slk(3NCURSES) manual page for details.
The routines getmouse, mousemask, ungetmouse, mouseinter- val, and wenclose relating to mouse interfacing are not part of XPG4, nor are they present in SVr4. See the mouse(3NCURSES) manual page for details.
The routine mcprint was not present in any previous curses implementation. See the print(3NCURSES) manual page for details.
The routine wresize is not part of XPG4, nor is it present in SVr4. See the wresize(3NCURSES) manual page for details.
In historic curses versions, delays embedded in the capa- bilities cr, ind, cub1, ff and tab activated corresponding delay bits in the UNIX tty driver. In this implementa- tion, all padding is done by NUL sends. This method is slightly more expensive, but narrows the interface to the UNIX kernel significantly and increases the package's portability correspondingly.
In the XSI standard and SVr4 manual pages, many entry points have prototype arguments of the for char *const (or cchar_t *const, or wchar_t *const, or void *const). Depending on one's interpretation of the ANSI C standard (see section 3.5.4.1), these declarations are either (a) meaningless, or (b) meaningless and illegal. The declara- tion const char *x is a modifiable pointer to unmodifiable data, but char *const x' is an unmodifiable pointer to modifiable data. Given that C passes arguments by value, <type> *const as a formal type is at best dubious. Some compilers choke on the prototypes. Therefore, in this implementation, they have been changed to const <type> * globally.
NOTES The header file <curses.h> automatically includes the header files <stdio.h> and <unctrl.h>.
If standard output from a ncurses program is re-directed to something which is not a tty, screen updates will be directed to standard error. This was an undocumented fea- ture of AT&T System V Release 3 curses.
AUTHORS Zeyd M. Ben-Halim, Eric S. Raymond, Thomas E. Dickey. Based on pcurses by Pavel Curtis.
ncurses(3NCURSES)