Provided by: ncurses-doc_5.9-4_all
ncurses - CRT screen handling and optimization package
The ncurses library routines give the user a terminal-independent method of updating character screens with reasonable optimization. This implementation is ``new curses'' (ncurses) and is the approved replacement for 4.4BSD classic curses, which has been discontinued. This describes ncurses version 5.9 (patch 20110404). The ncurses library emulates the curses library of System V Release 4 UNIX, and XPG4 (X/Open Portability Guide) curses (also known as XSI curses). XSI stands for X/Open System Interfaces Extension. The ncurses library is freely redistributable in source form. Differences from the SVr4 curses are summarized under the EXTENSIONS and PORTABILITY sections below and described in detail in the respective EXTENSIONS, PORTABILITY and BUGS sections of individual man pages. The ncurses library also provides many useful extensions, i.e., features which cannot be implemented by a simple add-on library but which require access to the internals of the library. 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 directory) that describe curses actions. See also the section on ALTERNATE CONFIGURATIONS. The ncurses package supports: overall screen, window and pad manipulation; output to windows and pads; reading terminal input; control over terminal and curses input and output options; environment query routines; color manipulation; use of soft label keys; terminfo capabilities; and access to low-level terminal-manipulation routines. The library uses the locale which the calling program has initialized. That is normally done with setlocale: setlocale(LC_ALL, ""); If the locale is not initialized, the library assumes that characters are printable as in ISO-8859-1, to work with certain legacy programs. You should initialize the locale and not rely on specific details of the library when the locale has not been setup. The function initscr or newterm must be called to initialize the library 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 terminal 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.] The ncurses library permits manipulation of data structures, 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 those, 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 displayed. See pad(3NCURSES) for more information. In addition to drawing characters on the screen, video attributes and colors may be supported, causing the characters 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 affect 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 program 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 definition 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 available. 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 values 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 routines prefixed with w require a window argument. The routines prefixed with p require a pad argument. Those without 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 WINDOW. Option setting routines require a Boolean flag bf with the value TRUE or FALSE; bf is always of type bool. Most of the data types used in the library routines, such as WINDOW, SCREEN, bool, and chtype are defined in <curses.h>. Types used for the terminfo routines such as TERMINAL are defined in <term.h>. This manual page describes functions which may appear in any configuration of the library. There are two common configurations of the library: ncurses the "normal" library, which handles 8-bit characters. The normal (8-bit) library stores characters combined with attributes in chtype data. Attributes alone (no corresponding character) may be stored in chtype or the equivalent attr_t data. In either case, the data is stored in something like an integer. Each cell (row and column) in a WINDOW is stored as a chtype. ncursesw the so-called "wide" library, which handles multibyte characters (see the section on ALTERNATE CONFIGURATIONS). The "wide" library includes all of the calls from the "normal" library. It adds about one third more calls using data types which store multibyte characters: cchar_t corresponds to chtype. However it is a structure, because more data is stored than can fit into an integer. The characters are large enough to require a full integer value - and there may be more than one character per cell. The video attributes and color are stored in separate fields of the structure. Each cell (row and column) in a WINDOW is stored as a cchar_t. wchar_t stores a "wide" character. Like chtype, this may be an integer. wint_t stores a wchar_t or WEOF - not the same, though both may have the same size. The "wide" library provides new functions which are analogous to functions in the "normal" library. There is a naming convention which relates many of the normal/wide variants: a "_w" is inserted into the name. For example, waddch becomes wadd_wch. 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_free_and_exit memleaks(3NCURSES)* _nc_freeall memleaks(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)* add_wch add_wch(3NCURSES) add_wchnstr add_wchstr(3NCURSES) add_wchstr add_wchstr(3NCURSES) addch addch(3NCURSES) addchnstr addchstr(3NCURSES) addchstr addchstr(3NCURSES) addnstr addstr(3NCURSES) addnwstr addwstr(3NCURSES) addstr addstr(3NCURSES) addwstr addwstr(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) bkgrnd bkgrnd(3NCURSES) bkgrndset bkgrnd(3NCURSES) border border(3NCURSES) border_set border_set(3NCURSES) box border(3NCURSES) box_set border_set(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) echo_wchar add_wch(3NCURSES) echochar addch(3NCURSES) endwin initscr(3NCURSES) erase clear(3NCURSES) erasechar termattrs(3NCURSES) erasewchar termattrs(3NCURSES) filter util(3NCURSES) flash beep(3NCURSES) flushinp util(3NCURSES) get_wch get_wch(3NCURSES) get_wstr get_wstr(3NCURSES) getattrs attr(3NCURSES) getbegx legacy(3NCURSES)* getbegy legacy(3NCURSES)* getbegyx getyx(3NCURSES) getbkgd bkgd(3NCURSES) getbkgrnd bkgrnd(3NCURSES) getcchar getcchar(3NCURSES) getch getch(3NCURSES) getcurx legacy(3NCURSES)* getcury legacy(3NCURSES)* getmaxx legacy(3NCURSES)* getmaxy legacy(3NCURSES)* getmaxyx getyx(3NCURSES) getmouse mouse(3NCURSES)* getn_wstr get_wstr(3NCURSES) getnstr getstr(3NCURSES) getparx legacy(3NCURSES)* getpary legacy(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) hline_set border_set(3NCURSES) idcok outopts(3NCURSES) idlok outopts(3NCURSES) immedok outopts(3NCURSES) in_wch in_wch(3NCURSES) in_wchnstr in_wchstr(3NCURSES) in_wchstr in_wchstr(3NCURSES) inch inch(3NCURSES) inchnstr inchstr(3NCURSES) inchstr inchstr(3NCURSES) init_color color(3NCURSES) init_pair color(3NCURSES) initscr initscr(3NCURSES) innstr instr(3NCURSES) innwstr inwstr(3NCURSES) ins_nwstr ins_wstr(3NCURSES) ins_wch ins_wch(3NCURSES) ins_wstr ins_wstr(3NCURSES) insch insch(3NCURSES) insdelln deleteln(3NCURSES) insertln deleteln(3NCURSES) insnstr insstr(3NCURSES) insstr insstr(3NCURSES) instr instr(3NCURSES) intrflush inopts(3NCURSES) inwstr inwstr(3NCURSES) is_cleared opaque(3NCURSES)* is_idcok opaque(3NCURSES)* is_idlok opaque(3NCURSES)* is_immedok opaque(3NCURSES)* is_keypad opaque(3NCURSES)* is_leaveok opaque(3NCURSES)* is_linetouched touch(3NCURSES) is_nodelay opaque(3NCURSES)* is_notimeout opaque(3NCURSES)* is_scrollok opaque(3NCURSES)* is_syncok opaque(3NCURSES)* is_term_resized resizeterm(3NCURSES)* is_wintouched touch(3NCURSES) isendwin initscr(3NCURSES) key_defined key_defined(3NCURSES)* key_name util(3NCURSES) keybound keybound(3NCURSES)* keyname util(3NCURSES) keyok keyok(3NCURSES)* keypad inopts(3NCURSES) killchar termattrs(3NCURSES) killwchar 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) mvadd_wch add_wch(3NCURSES) mvadd_wchnstr add_wchstr(3NCURSES) mvadd_wchstr add_wchstr(3NCURSES) mvaddch addch(3NCURSES) mvaddchnstr addchstr(3NCURSES) mvaddchstr addchstr(3NCURSES) mvaddnstr addstr(3NCURSES) mvaddnwstr addwstr(3NCURSES) mvaddstr addstr(3NCURSES) mvaddwstr addwstr(3NCURSES) mvchgat attr(3NCURSES) mvcur terminfo(3NCURSES) mvdelch delch(3NCURSES) mvderwin window(3NCURSES) mvget_wch get_wch(3NCURSES) mvget_wstr get_wstr(3NCURSES) mvgetch getch(3NCURSES) mvgetn_wstr get_wstr(3NCURSES) mvgetnstr getstr(3NCURSES) mvgetstr getstr(3NCURSES) mvhline border(3NCURSES) mvhline_set border_set(3NCURSES) mvin_wch in_wch(3NCURSES) mvin_wchnstr in_wchstr(3NCURSES) mvin_wchstr in_wchstr(3NCURSES) mvinch inch(3NCURSES) mvinchnstr inchstr(3NCURSES) mvinchstr inchstr(3NCURSES) mvinnstr instr(3NCURSES) mvinnwstr inwstr(3NCURSES) mvins_nwstr ins_wstr(3NCURSES) mvins_wch ins_wch(3NCURSES) mvins_wstr ins_wstr(3NCURSES) mvinsch insch(3NCURSES) mvinsnstr insstr(3NCURSES) mvinsstr insstr(3NCURSES) mvinstr instr(3NCURSES) mvinwstr inwstr(3NCURSES) mvprintw printw(3NCURSES) mvscanw scanw(3NCURSES) mvvline border(3NCURSES) mvvline_set border_set(3NCURSES) mvwadd_wch add_wch(3NCURSES) mvwadd_wchnstr add_wchstr(3NCURSES) mvwadd_wchstr add_wchstr(3NCURSES) mvwaddch addch(3NCURSES) mvwaddchnstr addchstr(3NCURSES) mvwaddchstr addchstr(3NCURSES) mvwaddnstr addstr(3NCURSES) mvwaddnwstr addwstr(3NCURSES) mvwaddstr addstr(3NCURSES) mvwaddwstr addwstr(3NCURSES) mvwchgat attr(3NCURSES) mvwdelch delch(3NCURSES) mvwget_wch get_wch(3NCURSES) mvwget_wstr get_wstr(3NCURSES) mvwgetch getch(3NCURSES) mvwgetn_wstr get_wstr(3NCURSES) mvwgetnstr getstr(3NCURSES) mvwgetstr getstr(3NCURSES) mvwhline border(3NCURSES) mvwhline_set border_set(3NCURSES) mvwin window(3NCURSES) mvwin_wch in_wch(3NCURSES) mvwin_wchnstr in_wchstr(3NCURSES) mvwin_wchstr in_wchstr(3NCURSES) mvwinch inch(3NCURSES) mvwinchnstr inchstr(3NCURSES) mvwinchstr inchstr(3NCURSES) mvwinnstr instr(3NCURSES) mvwinnwstr inwstr(3NCURSES) mvwins_nwstr ins_wstr(3NCURSES) mvwins_wch ins_wch(3NCURSES) mvwins_wstr ins_wstr(3NCURSES) mvwinsch insch(3NCURSES) mvwinsnstr insstr(3NCURSES) mvwinsstr insstr(3NCURSES) mvwinstr instr(3NCURSES) mvwinwstr inwstr(3NCURSES) mvwprintw printw(3NCURSES) mvwscanw scanw(3NCURSES) mvwvline border(3NCURSES) mvwvline_set border_set(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) nofilter util(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) setcchar getcchar(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) term_attrs termattrs(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) unget_wch get_wch(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)* use_legacy_coding legacy_coding(3NCURSES)* vid_attr terminfo(3NCURSES) vid_puts terminfo(3NCURSES) vidattr terminfo(3NCURSES) vidputs terminfo(3NCURSES) vline border(3NCURSES) vline_set border_set(3NCURSES) vw_printw printw(3NCURSES) vw_scanw scanw(3NCURSES) vwprintw printw(3NCURSES) vwscanw scanw(3NCURSES) wadd_wch add_wch(3NCURSES) wadd_wchnstr add_wchstr(3NCURSES) wadd_wchstr add_wchstr(3NCURSES) waddch addch(3NCURSES) waddchnstr addchstr(3NCURSES) waddchstr addchstr(3NCURSES) waddnstr addstr(3NCURSES) waddnwstr addwstr(3NCURSES) waddstr addstr(3NCURSES) waddwstr addwstr(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) wbkgrnd bkgrnd(3NCURSES) wbkgrndset bkgrnd(3NCURSES) wborder border(3NCURSES) wborder_set border_set(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) wecho_wchar add_wch(3NCURSES) wechochar addch(3NCURSES) wenclose mouse(3NCURSES)* werase clear(3NCURSES) wget_wch get_wch(3NCURSES) wget_wstr get_wstr(3NCURSES) wgetbkgrnd bkgrnd(3NCURSES) wgetch getch(3NCURSES) wgetn_wstr get_wstr(3NCURSES) wgetnstr getstr(3NCURSES) wgetstr getstr(3NCURSES) whline border(3NCURSES) whline_set border_set(3NCURSES) win_wch in_wch(3NCURSES) win_wchnstr in_wchstr(3NCURSES) win_wchstr in_wchstr(3NCURSES) winch inch(3NCURSES) winchnstr inchstr(3NCURSES) winchstr inchstr(3NCURSES) winnstr instr(3NCURSES) winnwstr inwstr(3NCURSES) wins_nwstr ins_wstr(3NCURSES) wins_wch ins_wch(3NCURSES) wins_wstr ins_wstr(3NCURSES) winsch insch(3NCURSES) winsdelln deleteln(3NCURSES) winsertln deleteln(3NCURSES) winsnstr insstr(3NCURSES) winsstr insstr(3NCURSES) winstr instr(3NCURSES) winwstr inwstr(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) wunctrl util(3NCURSES) wvline border(3NCURSES) wvline_set border_set(3NCURSES)
Routines that return an integer return ERR upon failure and an integer value other than ERR upon successful completion, unless otherwise noted in the routine descriptions. All macros return the value of the w version, except setscrreg, wsetscrreg, getyx, getbegyx, and 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.
The following environment symbols are useful for customizing 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 terminfo entries provide this feature. Because this name is also used in development environments to represent the C compiler's name, ncurses ignores it if it does not happen to be a single character. COLUMNS Specify the width of the screen in characters. Applications running in a windowing environment usually 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. 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. However, setting COLUMNS and/or LINES overrides the library's use of the screen size obtained from the operating system. 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 all use of external environment (including system calls) to determine the screen size. 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 variable 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 character 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. In addition to the environment variable, this implementation provides a global variable with the same name. Portable applications should not rely upon the presence of ESCDELAY in either form, but setting the environment variable rather than the global variable does not create problems when compiling an application. 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_ASSUMED_COLORS Override the compiled-in assumption that the terminal's default colors are white-on- black (see default_colors(3NCURSES)). You may set the foreground and background color values with this environment variable by proving a 2-element list: foreground,background. For example, to tell ncurses to not assume anything about the colors, set this to "-1,-1". To make it green-on-black, set it to "2,0". Any positive value from zero to the terminfo max_colors value is allowed. NCURSES_GPM_TERMS This applies only to ncurses configured to use the GPM interface. If present, the environment variable is a list of one or more terminal names against which the TERM environment variable is matched. Setting it to an empty value disables the GPM interface; using the built-in support for xterm, etc. If the environment variable is absent, ncurses will attempt to open GPM if TERM contains "linux". NCURSES_NO_HARD_TABS Ncurses may use tabs as part of the cursor movement optimization. In some cases, your terminal driver may not handle these properly. Set this environment variable to disable the feature. You can also adjust your stty settings to avoid the problem. NCURSES_NO_MAGIC_COOKIES Some terminals use a magic-cookie feature which requires special handling to make highlighting and other video attributes display properly. You can suppress the highlighting entirely for these terminals by setting this environment variable. 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 applications. 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., timing. Unless a hardware terminal is interfaced into a terminal concentrator (which does flow control), it (or your application) must manage dataflow, preventing 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 terminal initialization. This is done (as in SVr4 curses) for performance reasons. For testing purposes, 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_NO_UTF8_ACS During initialization, the ncurses library checks for special cases where VT100 line- drawing (and the corresponding alternate character set capabilities) described in the terminfo are known to be missing. Specifically, when running in a UTF-8 locale, the Linux console emulator and the GNU screen program ignore these. Ncurses checks the TERM environment variable for these. For other special cases, you should set this environment variable. Doing this tells ncurses to use Unicode values which correspond to the VT100 line-drawing glyphs. That works for the special cases cited, and is likely to work for terminal emulators. When setting this variable, you should set it to a nonzero value. Setting it to zero (or to a nonnumber) disables the special check for "linux" and "screen". As an alternative to the environment variable, ncurses checks for an extended terminfo capability U8. This is a numeric capability which can be compiled using tic -x. For example # linux console, if patched to provide working # VT100 shift-in/shift-out, with corresponding font. linux-vt100|linux console with VT100 line-graphics, U8#0, use=linux, # uxterm with vt100Graphics resource set to false xterm-utf8|xterm relying on UTF-8 line-graphics, U8#1, use=xterm, The name "U8" is chosen to be two characters, to permit it to be used by applications that use ncurses' termcap interface. 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 termcap 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 terminal 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 filenames 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.
Several different configurations are possible, depending on the configure script options used when building ncurses. There are a few main options whose effects are visible to the applications developer using ncurses: --disable-overwrite The standard include for ncurses is as noted in SYNOPSIS: #include <curses.h> This option is used to avoid filename conflicts when ncurses is not the main implementation of curses of the computer. If ncurses is installed disabling overwrite, it puts its headers in a subdirectory, e.g., #include <ncurses/curses.h> It also omits a symbolic link which would allow you to use -lcurses to build executables. --enable-widec The configure script renames the library and (if the --disable-overwrite option is used) puts the header files in a different subdirectory. All of the library names have a "w" appended to them, i.e., instead of -lncurses you link with -lncursesw You must also define _XOPEN_SOURCE_EXTENDED when compiling for the wide-character library to use the extended (wide-character) functions. The curses.h file which is installed for the wide-character library is designed to be compatible with the normal library's header. Only the size of the WINDOW structure differs, and very few applications require more than a pointer to WINDOWs. If the headers are installed allowing overwrite, the wide-character library's headers should be installed last, to allow applications to be built using either library from the same set of headers. --with-shared --with-normal --with-debug --with-profile The shared and normal (static) library names differ by their suffixes, e.g., libncurses.so and libncurses.a. The debug and profiling libraries add a "_g" and a "_p" to the root names respectively, e.g., libncurses_g.a and libncurses_p.a. --with-trace The trace function normally resides in the debug library, but it is sometimes useful to configure this in the shared library. Configure scripts should check for the function's existence rather than assuming it is always in the debug library.
/usr/share/tabset directory containing initialization files for the terminal capability database /usr/share/terminfo terminal capability database
terminfo(5) and related pages whose names begin "curs_" for detailed routine descriptions. curses_variables(3NCURSES)
The ncurses library can be compiled with an option (-DUSE_GETCAP) that falls back to the old-style /etc/termcap 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 configured 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) key_defined(3NCURSES), and keyok(3NCURSES) manual pages for details. The ncurses library can exploit the capabilities of terminals which implement the ISO-6429 SGR 39 and SGR 49 controls, 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 colored text on a background whose color is set independently, providing better control over color contrasts. See the default_colors(3NCURSES) 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.
The ncurses library is intended to be BASE-level conformant with XSI Curses. The EXTENDED XSI Curses functionality (including color support) is supported. 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. This implementation also contains several extensions: · 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 present in SVr4. See the slk(3NCURSES) manual page for details. · The routines getmouse, mousemask, ungetmouse, mouseinterval, 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. · The WINDOW structure's internal details can be hidden from application programs. See opaque(3NCURSES) for the discussion of is_scrollok, etc. · This implementation can be configured to provide rudimentary support for multi- threaded applications. See threads(3NCURSES) for details. · This implementation can also be configured to provide a set of functions which improve the ability to manage multiple screens. See sp_funcs(3NCURSES) for details. In historic curses versions, delays embedded in the capabilities cr, ind, cub1, ff and tab activated corresponding delay bits in the UNIX tty driver. In this implementation, all padding is done by sending NUL bytes. This method is slightly more expensive, but narrows the interface to the UNIX kernel significantly and increases the package's portability correspondingly.
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 feature of AT&T System V Release 3 curses.
Zeyd M. Ben-Halim, Eric S. Raymond, Thomas E. Dickey. Based on pcurses by Pavel Curtis. ncurses(3NCURSES)