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ncurses(3X) Library calls ncurses(3X) NAME ncurses - character-cell terminal interface with optimized output SYNOPSIS #include <curses.h> DESCRIPTION The "new curses" library offers the programmer a terminal-independent means of reading keyboard and mouse input and writing to character-cell displays with output optimized to minimize screen updates. ncurses replaces the curses libraries from System V Release 4 Unix ("SVr4") and 4.4BSD Unix, the development of which ceased in the 1990s. This document describes ncurses version 6.6 (patch 20251230). ncurses permits control of the terminal screen's contents; abstraction and subdivision thereof with windows and pads; acquisition of keyboard and mouse events; selection of color and rendering attributes (such as bold or underline); the definition and use of soft label keys; access to the term- info terminal capability database; a termcap compatibility interface; and an abstraction of the system's API for manipulating the terminal (such as termios(3)). ncurses implements the interface described by X/Open Curses Issue 7. In many behavioral details not standardized by X/Open, ncurses emulates the curses library of SVr4 and provides numerous useful extensions. ncurses man pages employ several sections to clarify matters of usage and interoperability with other curses implementations. * "NOTES" describes issues and caveats of which any user of the ncurses API should be aware, such as limitations on the size of an underlying integral type or the availability of a preprocessor macro exclusive of a function definition (which prevents its address from being taken). This section also describes implementation details of significance to the programmer but which are not standardized. * "EXTENSIONS" presents ncurses innovations beyond the X/Open Curses standard and/or the SVr4 curses implementation. They are termed exten- sions to indicate that they cannot be implemented solely by using the library API, but require access to the library's internal state. * "PORTABILITY" discusses matters (beyond the exercise of extensions) that should be considered when writing to a curses standard, or for multiple implementations. * "HISTORY" examines points of detail in ncurses and other curses imple- mentations over the decades of their development, particularly where precedent or inertia have frustrated better design (and, in a few cases, where such inertia has been overcome). A curses application must be linked with the library; use the -lncurses op- tion to your compiler or linker. A debugging version of the library may be available; if so, link with it using -lncurses_g. (Your system integrator may have installed these libraries such that you can use the options -lcurses and -lcurses_g, respectively.) The ncurses_g library logs events describing ncurses actions to a file called trace in the application's working directory at startup. See section "ALTERNATE CONFIGURATIONS" be- low. Application Structure A curses application uses information from the system locale; setlocale(3) prepares it for curses library calls. setlocale(LC_ALL, ""); If the locale is not thus initialized, the library assumes that characters are printable as in ISO 8859-1, to work with certain legacy programs. You should initialize the locale; do not expect consistent behavior from the library when the locale has not been set up. initscr(3X) or newterm(3X) must be called to initialize curses before use of any functions that access or manipulate windows or screens. To get character-at-a-time input without echoing -- most interactive, screen-oriented programs want this -- use the following sequence. initscr(); cbreak(); noecho(); Most applications would perform further setup as follows. noqiflush(); keypad(stdscr, TRUE); A curses program then often enters an event-handling loop. Call endwin(3X) before exiting. Overview A curses library abstracts the terminal with a SCREEN data structure, and represents all or part of its display with WINDOW structures. Distinct properties apply to each; for example, the line discipline of a typical Unix terminal driver is in one of three modes: raw, cbreak, or canonical ("cooked"). In curses, the line discipline is a property of the screen, applying identically to all windows associated with it. A window is a rectangular grid of character cells, addressed by line and column coordinates (y, x), with the upper left corner as (0, 0). A window called stdscr, by default the same size as the terminal screen, is always available. Create others with newwin(3X). A curses library does not manage overlapping windows (but see below). You can either use stdscr to manage one screen-filling window, or tile the screen into non-overlapping windows and not use stdscr at all. Mixing the two approaches will result in unpredictable and undesired effects. Functions permit manipulation of a window and the cursor identifying the cell within it at which the next operation will occur. Among those, the most basic are move(3X) and addch(3X): these place the cursor within and write a character to stdscr, respectively. Frequent changes to the terminal screen can cause unpleasant flicker or in- efficient use of the communication channel to the device, so as a rule the library does not update it automatically. Therefore, after using curses functions to accumulate a set of desired updates that make sense to present together, call refresh(3X) to tell the library to make the user's screen look like stdscr. The library optimizes its output by computing a minimal volume of operations to mutate the screen from its state at the previous refresh to the new one. Effective optimization demands accurate informa- tion about the terminal device: the management of such information is the province of the terminfo(3X) API, a feature of every standard curses imple- mentation. Special windows called pads may also be manipulated. These are not con- strained to the size of the terminal screen and their contents need not be completely displayed. See curs_pad(3X). Many terminals support configuration of character cell foreground and back- ground colors as well as attributes, which cause characters to render in such modes as boldfaced, underlined, or in reverse video. See curs_color(3X) and curs_attr(3X). curses defines constants to simplify access to a small set of forms-drawing graphics corresponding to the DEC Alternate Character Set (ACS), a feature of VT100 and other terminals. See addch(3X). curses is implemented using the operating system's terminal driver; key events are received not as scan codes but as byte sequences. The driver reports graphical keycaps (alphanumeric and punctuation keys, and the space) as-is. Everything else, including the tab, enter/return, keypad, arrow, and function keys, appears to curses as a control character or a multibyte escape sequence. curses can translate the latter into unique key codes. See keypad(3X) and getch(3X). ncurses provides reimplementations of the SVr4 panel(3X), form(3X), and menu(3X) libraries; they permit overlapping windows and ease construction of user interfaces with curses. Initialization The selection of an appropriate value of TERM in the process environment is essential to correct curses and terminfo library operation. A well-config- ured system selects a correct TERM value automatically; tset(1) may assist with troubleshooting exotic situations. If you change the terminal type from a shell, export TERM, then run tset(1) or the "tput init" command. See subsection "Tabs and Initialization" of terminfo(5). If the environment variables LINES and COLUMNS are set, or if the curses program is executing in a graphical windowing environment, the information obtained thence overrides that obtained by terminfo. An ncurses extension supports resizable terminal displays; see wresize(3X). If the environment variable TERMINFO is defined, a curses program checks first for a terminal type description in the location it identifies. TERMINFO is useful for developing type descriptions or when write permis- sion to /usr/share/misc/terminfo is not available. See section "ENVIRONMENT" below. Naming Conventions curses offers many functions in variant forms using a regular set of alter- natives to the name of an elemental one. Those prefixed with "w" require a WINDOW pointer argument; those with a "mv" prefix first perform cursor movement using wmove(3X); a "mvw" prefix indicates both. The "w" function is typically the elemental one; the removal of this prefix usually indi- cates operation on stdscr. Four functions prefixed with "p" require a pad argument; see below. In function synopses, ncurses man pages apply the following names to para- meters. We introduce the character types in the next subsection. bf a bool (TRUE or FALSE) c a char or int ch a chtype wc a wchar_t or wint_t wch a cchar_t win pointer to a WINDOW pad pointer to a WINDOW that is a pad pair a foreground/background color pair identifier Wide and Non-wide Character Configurations This man page primarily surveys functions that appear in any configuration of the library. There are two common configurations; for others, see sec- tion "ALTERNATE CONFIGURATIONS" below. ncurses is the library in its "non-wide" configuration, handling only eight-bit characters. It stores a character combined with at- tributes and a color pair identifier in a chtype datum, which is often an alias of int. A string of curses characters is similar to a C char string; a chtype string ends with an integral 0, the null curses character. Attributes and a color pair identifier (with no corresponding character) can be stored in variables of chtype or attr_t type. In either case, they are accessed via an integral bit mask. ncurses stores each cell of a WINDOW as a chtype. X/Open Curses does not specify the sizes of the character code or color pair identifier, nor the quantity of attribute bits, in chtype; these are implementation-dependent. ncurses uses eight bits for the character code. An application requiring a wider character type, for instance to represent Unicode, should use the wide-character API. ncursesw is the library in its "wide" configuration, which handles charac- ter encodings requiring a larger data type than char (a byte- sized type) can represent. It provides additional functions that complement those in the non-wide library where the size of the underlying character type is significant. A somewhat regular naming convention relates many of the wide variants to their non- wide counterparts; where a non-wide function name contains "ch" or "str", prefix it with "_w" to obtain the wide counterpart. For example, waddch becomes wadd_wch. An exception is ins_nwstr (and its variants), spelled thus instead of "insn_wstr". (Excep- tions that add only "w" comprise addwstr, inwstr, and their vari- ants.) This convention is inapplicable to some non-wide function names, so other transformations are used for the wide configuration: the window background management function "bkgd" becomes "bkgrnd"; the window border-drawing and -clearing functions are suffixed with "_set"; and character attribute manipulation functions like "attron" become "attr_on". cchar_t is a curses complex character and corresponds to the non-wide-character configuration's chtype. It is a structure type because it requires more storage than a standard scalar type offers. A character code may not be representable as a char, and moreover more than one character may occupy a cell (as with accent marks and other diacritics). Each character is of type wchar_t; a complex character contains one spacing character and zero or more non-spacing characters (see below). A string of complex characters ends with a cchar_t whose wchar_t member is the null wide character. Attributes and a color pair identifier are stored in separate fields of the structure, not combined into an integer as in chtype. ncurses stores each cell of a WINDOW as a cchar_t. setcchar(3X) and getcchar(3X) store and retrieve cchar_t data. The wide library API of ncurses depends on two data types stan- dardized by ISO C95. wchar_t stores a wide character. Like chtype, it may be an alias of int. Depending on the character encoding, a wide character may be spacing, meaning that it occupies a character cell by itself and typically accompanies cursor advancement, or non-spacing, meaning that it oc- cupies the same cell as a spacing character, is often regarded as a "modifier" of the base glyph with which it combines, and typically does not advance the cursor. wint_t can store a wchar_t or the constant WEOF, analogously to the int-sized character manipulation functions of ISO C and its constant EOF. Function Name Index The following table lists the curses functions provided in the non-wide and wide APIs and the corresponding man pages that describe them. Those flagged with "*" are ncurses-specific, neither described by X/Open Curses nor present in SVr4. curses Function Name Man Page --------------------------------------------- COLOR_PAIR curs_color(3X) PAIR_NUMBER curs_color(3X) add_wch curs_add_wch(3X) add_wchnstr curs_add_wchstr(3X) add_wchstr curs_add_wchstr(3X) addch curs_addch(3X) addchnstr curs_addchstr(3X) addchstr curs_addchstr(3X) addnstr curs_addstr(3X) addnwstr curs_addwstr(3X) addstr curs_addstr(3X) addwstr curs_addwstr(3X) alloc_pair new_pair(3X)* assume_default_colors default_colors(3X)* attr_get curs_attr(3X) attr_off curs_attr(3X) attr_on curs_attr(3X) attr_set curs_attr(3X) attroff curs_attr(3X) attron curs_attr(3X) attrset curs_attr(3X) baudrate curs_termattrs(3X) beep curs_beep(3X) bkgd curs_bkgd(3X) bkgdset curs_bkgd(3X) bkgrnd curs_bkgrnd(3X) bkgrndset curs_bkgrnd(3X) border curs_border(3X) border_set curs_border_set(3X) box curs_border(3X) box_set curs_border_set(3X) can_change_color curs_color(3X) cbreak curs_inopts(3X) chgat curs_attr(3X) clear curs_clear(3X) clearok curs_outopts(3X) clrtobot curs_clear(3X) clrtoeol curs_clear(3X) color_content curs_color(3X) color_set curs_attr(3X) copywin curs_overlay(3X) curs_set curs_kernel(3X) curses_trace curs_trace(3X)* curses_version curs_extend(3X)* def_prog_mode curs_kernel(3X) def_shell_mode curs_kernel(3X) define_key define_key(3X)* del_curterm curs_terminfo(3X) delay_output curs_util(3X) delch curs_delch(3X) deleteln curs_deleteln(3X) delscreen curs_initscr(3X) delwin curs_window(3X) derwin curs_window(3X) doupdate curs_refresh(3X) dupwin curs_window(3X) echo curs_inopts(3X) echo_wchar curs_add_wch(3X) echochar curs_addch(3X) endwin curs_initscr(3X) erase curs_clear(3X) erasechar curs_termattrs(3X) erasewchar curs_termattrs(3X) exit_curses curs_memleaks(3X)* exit_terminfo curs_memleaks(3X)* extended_color_content curs_color(3X)* extended_pair_content curs_color(3X)* extended_slk_color curs_slk(3X)* filter curs_util(3X) find_pair new_pair(3X)* flash curs_beep(3X) flushinp curs_util(3X) free_pair new_pair(3X)* get_escdelay curs_threads(3X)* get_wch curs_get_wch(3X) get_wstr curs_get_wstr(3X) getattrs curs_attr(3X) getbegx curs_legacy(3X)* getbegy curs_legacy(3X)* getbegyx curs_getyx(3X) getbkgd curs_bkgd(3X) getbkgrnd curs_bkgrnd(3X) getcchar curs_getcchar(3X) getch curs_getch(3X) getcurx curs_legacy(3X)* getcury curs_legacy(3X)* getmaxx curs_legacy(3X)* getmaxy curs_legacy(3X)* getmaxyx curs_getyx(3X) getmouse curs_mouse(3X)* getn_wstr curs_get_wstr(3X) getnstr curs_getstr(3X) getparx curs_legacy(3X)* getpary curs_legacy(3X)* getparyx curs_getyx(3X) getstr curs_getstr(3X) getsyx curs_kernel(3X) getwin curs_util(3X) getyx curs_getyx(3X) halfdelay curs_inopts(3X) has_colors curs_color(3X) has_ic curs_termattrs(3X) has_il curs_termattrs(3X) has_key curs_getch(3X)* has_mouse curs_mouse(3X)* hline curs_border(3X) hline_set curs_border_set(3X) idcok curs_outopts(3X) idlok curs_outopts(3X) immedok curs_outopts(3X) in_wch curs_in_wch(3X) in_wchnstr curs_in_wchstr(3X) in_wchstr curs_in_wchstr(3X) inch curs_inch(3X) inchnstr curs_inchstr(3X) inchstr curs_inchstr(3X) init_color curs_color(3X) init_extended_color curs_color(3X)* init_extended_pair curs_color(3X)* init_pair curs_color(3X) initscr curs_initscr(3X) innstr curs_instr(3X) innwstr curs_inwstr(3X) ins_nwstr curs_ins_wstr(3X) ins_wch curs_ins_wch(3X) ins_wstr curs_ins_wstr(3X) insch curs_insch(3X) insdelln curs_deleteln(3X) insertln curs_deleteln(3X) insnstr curs_insstr(3X) insstr curs_insstr(3X) instr curs_instr(3X) intrflush curs_inopts(3X) inwstr curs_inwstr(3X) is_cbreak curs_inopts(3X)* is_cleared curs_opaque(3X)* is_echo curs_inopts(3X)* is_idcok curs_opaque(3X)* is_idlok curs_opaque(3X)* is_immedok curs_opaque(3X)* is_keypad curs_opaque(3X)* is_leaveok curs_opaque(3X)* is_linetouched curs_touch(3X) is_nl curs_inopts(3X)* is_nodelay curs_opaque(3X)* is_notimeout curs_opaque(3X)* is_pad curs_opaque(3X)* is_raw curs_inopts(3X)* is_scrollok curs_opaque(3X)* is_subwin curs_opaque(3X)* is_syncok curs_opaque(3X)* is_term_resized resizeterm(3X)* is_wintouched curs_touch(3X) isendwin curs_initscr(3X) key_defined key_defined(3X)* key_name curs_util(3X) keybound keybound(3X)* keyname curs_util(3X) keyok keyok(3X)* keypad curs_inopts(3X) killchar curs_termattrs(3X) killwchar curs_termattrs(3X) leaveok curs_outopts(3X) longname curs_termattrs(3X) mcprint curs_print(3X)* meta curs_inopts(3X) mouse_trafo curs_mouse(3X)* mouseinterval curs_mouse(3X)* mousemask curs_mouse(3X)* move curs_move(3X) mvadd_wch curs_add_wch(3X) mvadd_wchnstr curs_add_wchstr(3X) mvadd_wchstr curs_add_wchstr(3X) mvaddch curs_addch(3X) mvaddchnstr curs_addchstr(3X) mvaddchstr curs_addchstr(3X) mvaddnstr curs_addstr(3X) mvaddnwstr curs_addwstr(3X) mvaddstr curs_addstr(3X) mvaddwstr curs_addwstr(3X) mvchgat curs_attr(3X) mvcur curs_kernel(3X) mvdelch curs_delch(3X) mvderwin curs_window(3X) mvget_wch curs_get_wch(3X) mvget_wstr curs_get_wstr(3X) mvgetch curs_getch(3X) mvgetn_wstr curs_get_wstr(3X) mvgetnstr curs_getstr(3X) mvgetstr curs_getstr(3X) mvhline curs_border(3X) mvhline_set curs_border_set(3X) mvin_wch curs_in_wch(3X) mvin_wchnstr curs_in_wchstr(3X) mvin_wchstr curs_in_wchstr(3X) mvinch curs_inch(3X) mvinchnstr curs_inchstr(3X) mvinchstr curs_inchstr(3X) mvinnstr curs_instr(3X) mvinnwstr curs_inwstr(3X) mvins_nwstr curs_ins_wstr(3X) mvins_wch curs_ins_wch(3X) mvins_wstr curs_ins_wstr(3X) mvinsch curs_insch(3X) mvinsnstr curs_insstr(3X) mvinsstr curs_insstr(3X) mvinstr curs_instr(3X) mvinwstr curs_inwstr(3X) mvprintw curs_printw(3X) mvscanw curs_scanw(3X) mvvline curs_border(3X) mvvline_set curs_border_set(3X) mvwadd_wch curs_add_wch(3X) mvwadd_wchnstr curs_add_wchstr(3X) mvwadd_wchstr curs_add_wchstr(3X) mvwaddch curs_addch(3X) mvwaddchnstr curs_addchstr(3X) mvwaddchstr curs_addchstr(3X) mvwaddnstr curs_addstr(3X) mvwaddnwstr curs_addwstr(3X) mvwaddstr curs_addstr(3X) mvwaddwstr curs_addwstr(3X) mvwchgat curs_attr(3X) mvwdelch curs_delch(3X) mvwget_wch curs_get_wch(3X) mvwget_wstr curs_get_wstr(3X) mvwgetch curs_getch(3X) mvwgetn_wstr curs_get_wstr(3X) mvwgetnstr curs_getstr(3X) mvwgetstr curs_getstr(3X) mvwhline curs_border(3X) mvwhline_set curs_border_set(3X) mvwin curs_window(3X) mvwin_wch curs_in_wch(3X) mvwin_wchnstr curs_in_wchstr(3X) mvwin_wchstr curs_in_wchstr(3X) mvwinch curs_inch(3X) mvwinchnstr curs_inchstr(3X) mvwinchstr curs_inchstr(3X) mvwinnstr curs_instr(3X) mvwinnwstr curs_inwstr(3X) mvwins_nwstr curs_ins_wstr(3X) mvwins_wch curs_ins_wch(3X) mvwins_wstr curs_ins_wstr(3X) mvwinsch curs_insch(3X) mvwinsnstr curs_insstr(3X) mvwinsstr curs_insstr(3X) mvwinstr curs_instr(3X) mvwinwstr curs_inwstr(3X) mvwprintw curs_printw(3X) mvwscanw curs_scanw(3X) mvwvline curs_border(3X) mvwvline_set curs_border_set(3X) napms curs_kernel(3X) newpad curs_pad(3X) newterm curs_initscr(3X) newwin curs_window(3X) nl curs_inopts(3X) nocbreak curs_inopts(3X) nodelay curs_inopts(3X) noecho curs_inopts(3X) nofilter curs_util(3X)* nonl curs_inopts(3X) noqiflush curs_inopts(3X) noraw curs_inopts(3X) notimeout curs_inopts(3X) overlay curs_overlay(3X) overwrite curs_overlay(3X) pair_content curs_color(3X) pecho_wchar curs_pad(3X) pechochar curs_pad(3X) pnoutrefresh curs_pad(3X) prefresh curs_pad(3X) printw curs_printw(3X) putp curs_terminfo(3X) putwin curs_util(3X) qiflush curs_inopts(3X) raw curs_inopts(3X) redrawwin curs_refresh(3X) refresh curs_refresh(3X) reset_color_pairs curs_color(3X)* reset_prog_mode curs_kernel(3X) reset_shell_mode curs_kernel(3X) resetty curs_kernel(3X) resize_term resizeterm(3X)* resizeterm resizeterm(3X)* restartterm curs_terminfo(3X) ripoffline curs_kernel(3X) savetty curs_kernel(3X) scanw curs_scanw(3X) scr_dump curs_scr_dump(3X) scr_init curs_scr_dump(3X) scr_restore curs_scr_dump(3X) scr_set curs_scr_dump(3X) scrl curs_scroll(3X) scroll curs_scroll(3X) scrollok curs_outopts(3X) set_curterm curs_terminfo(3X) set_escdelay curs_threads(3X)* set_tabsize curs_threads(3X)* set_term curs_initscr(3X) setcchar curs_getcchar(3X) setscrreg curs_outopts(3X) setsyx curs_kernel(3X) setupterm curs_terminfo(3X) slk_attr curs_slk(3X)* slk_attr_off curs_slk(3X) slk_attr_on curs_slk(3X) slk_attr_set curs_slk(3X) slk_attroff curs_slk(3X) slk_attron curs_slk(3X) slk_attrset curs_slk(3X) slk_clear curs_slk(3X) slk_color curs_slk(3X) slk_init curs_slk(3X) slk_label curs_slk(3X) slk_noutrefresh curs_slk(3X) slk_refresh curs_slk(3X) slk_restore curs_slk(3X) slk_set curs_slk(3X) slk_touch curs_slk(3X) slk_wset curs_slk(3X) standend curs_attr(3X) standout curs_attr(3X) start_color curs_color(3X) subpad curs_pad(3X) subwin curs_window(3X) syncok curs_window(3X) term_attrs curs_termattrs(3X) termattrs curs_termattrs(3X) termname curs_termattrs(3X) tgetent curs_termcap(3X) tgetflag curs_termcap(3X) tgetnum curs_termcap(3X) tgetstr curs_termcap(3X) tgoto curs_termcap(3X) tigetflag curs_terminfo(3X) tigetnum curs_terminfo(3X) tigetstr curs_terminfo(3X) timeout curs_inopts(3X) tiparm curs_terminfo(3X) tiparm_s curs_terminfo(3X)* tiscan_s curs_terminfo(3X)* touchline curs_touch(3X) touchwin curs_touch(3X) tparm curs_terminfo(3X) tputs curs_termcap(3X) tputs curs_terminfo(3X) trace curs_trace(3X)* typeahead curs_inopts(3X) unctrl curs_util(3X) unget_wch curs_get_wch(3X) ungetch curs_getch(3X) ungetmouse curs_mouse(3X)* untouchwin curs_touch(3X) use_default_colors default_colors(3X)* use_env curs_util(3X) use_extended_names curs_extend(3X)* use_legacy_coding legacy_coding(3X)* use_screen curs_threads(3X)* use_tioctl curs_util(3X)* use_window curs_threads(3X)* vid_attr curs_terminfo(3X) vid_puts curs_terminfo(3X) vidattr curs_terminfo(3X) vidputs curs_terminfo(3X) vline curs_border(3X) vline_set curs_border_set(3X) vw_printw curs_printw(3X) vw_scanw curs_scanw(3X) vwprintw curs_printw(3X) vwscanw curs_scanw(3X) wadd_wch curs_add_wch(3X) wadd_wchnstr curs_add_wchstr(3X) wadd_wchstr curs_add_wchstr(3X) waddch curs_addch(3X) waddchnstr curs_addchstr(3X) waddchstr curs_addchstr(3X) waddnstr curs_addstr(3X) waddnwstr curs_addwstr(3X) waddstr curs_addstr(3X) waddwstr curs_addwstr(3X) wattr_get curs_attr(3X) wattr_off curs_attr(3X) wattr_on curs_attr(3X) wattr_set curs_attr(3X) wattroff curs_attr(3X) wattron curs_attr(3X) wattrset curs_attr(3X) wbkgd curs_bkgd(3X) wbkgdset curs_bkgd(3X) wbkgrnd curs_bkgrnd(3X) wbkgrndset curs_bkgrnd(3X) wborder curs_border(3X) wborder_set curs_border_set(3X) wchgat curs_attr(3X) wclear curs_clear(3X) wclrtobot curs_clear(3X) wclrtoeol curs_clear(3X) wcolor_set curs_attr(3X) wcursyncup curs_window(3X) wdelch curs_delch(3X) wdeleteln curs_deleteln(3X) wecho_wchar curs_add_wch(3X) wechochar curs_addch(3X) wenclose curs_mouse(3X)* werase curs_clear(3X) wget_wch curs_get_wch(3X) wget_wstr curs_get_wstr(3X) wgetbkgrnd curs_bkgrnd(3X) wgetch curs_getch(3X) wgetdelay curs_opaque(3X)* wgetn_wstr curs_get_wstr(3X) wgetnstr curs_getstr(3X) wgetparent curs_opaque(3X)* wgetscrreg curs_opaque(3X)* wgetstr curs_getstr(3X) whline curs_border(3X) whline_set curs_border_set(3X) win_wch curs_in_wch(3X) win_wchnstr curs_in_wchstr(3X) win_wchstr curs_in_wchstr(3X) winch curs_inch(3X) winchnstr curs_inchstr(3X) winchstr curs_inchstr(3X) winnstr curs_instr(3X) winnwstr curs_inwstr(3X) wins_nwstr curs_ins_wstr(3X) wins_wch curs_ins_wch(3X) wins_wstr curs_ins_wstr(3X) winsch curs_insch(3X) winsdelln curs_deleteln(3X) winsertln curs_deleteln(3X) winsnstr curs_insstr(3X) winsstr curs_insstr(3X) winstr curs_instr(3X) winwstr curs_inwstr(3X) wmouse_trafo curs_mouse(3X)* wmove curs_move(3X) wnoutrefresh curs_refresh(3X) wprintw curs_printw(3X) wredrawln curs_refresh(3X) wrefresh curs_refresh(3X) wresize wresize(3X)* wscanw curs_scanw(3X) wscrl curs_scroll(3X) wsetscrreg curs_outopts(3X) wstandend curs_attr(3X) wstandout curs_attr(3X) wsyncdown curs_window(3X) wsyncup curs_window(3X) wtimeout curs_inopts(3X) wtouchln curs_touch(3X) wunctrl curs_util(3X) wvline curs_border(3X) wvline_set curs_border_set(3X) ncurses's screen-pointer extension adds additional functions corresponding to many of the above, each with an "_sp" suffix; see curs_sp_funcs(3X). The availability of some extensions is configurable when ncurses is com- piled; see sections "ALTERNATE CONFIGURATIONS" and "EXTENSIONS" below. RETURN VALUE Unless otherwise noted, functions that return integers return the constants OK on success and ERR on failure; see curs_variables(3X). Functions that return pointers return a null pointer on failure. Typically, ncurses treats a null pointer passed as a function parameter as a failure. Func- tions prefixed with "mv" first perform cursor movement and fail if the po- sition (y, x) is outside the window boundaries. ENVIRONMENT The following symbols from the process environment customize the runtime behavior of ncurses applications. The library may be configured to disre- gard the variables TERMINFO, TERMINFO_DIRS, TERMPATH, and HOME, if the user is the superuser (root), or the application uses setuid(2) or setgid(2). BAUDRATE The debugging library checks this variable when the application has redi- rected output to a file. ncurses interprets its integral value as the ter- minal's line speed in bits per second. If that value is absent or invalid, ncurses uses 9600. This feature allows developers to construct repeatable test cases that take into account optimization decisions that depend on the terminal's line speed. CC (command character) When set, the command_character (cmdch) capability value of loaded terminfo entries changes to the value of this variable. Very few terminfo entries provide this feature. Because this name is also used in development environments to store the C compiler's name, ncurses ignores its value if it is not one character in length. COLUMNS This variable specifies the width of the screen in character cells. Appli- cations running in a windowing environment usually are able to obtain the width of the window in which they are executing. ncurses enforces an upper limit of 512 when reading the value. If COLUMNS is not defined and the terminal's screen size is not available from the terminal driver, ncurses uses the size specified by the columns (cols) capability of the terminal type's entry in the terminfo database, if any. It is important that your application use the correct screen size. Auto- matic detection thereof is not always possible because an application may be running on a host that does not honor NAWS (Negotiations About Window Size) or as a different user ID than the owner of the terminal device file. Setting COLUMNS and/or LINES overrides the library's use of the screen size obtained from the operating system. The COLUMNS and LINES variables may be specified independently. This prop- erty is useful to circumvent misfeatures of legacy terminal type descrip- tions; xterm(1) descriptions specifying 65 lines were once notorious. For best results, avoid specifying cols and lines capability codes in terminfo descriptions of terminal emulators. use_env(3X) can disable use of the process environment in determining the screen size. use_tioctl(3X) can update COLUMNS and LINES to match the screen size obtained from system calls or the terminal database. ESCDELAY For curses to distinguish the ESC character resulting from a user's press of the "Escape" key on the input device from one beginning an escape se- quence (as commonly produced by function keys), it waits after receiving the escape character to see if further characters are available on the in- put stream within a short interval. A global variable ESCDELAY stores this interval in milliseconds. The default value of 1000 (one second) is ade- quate for most uses. This environment variable overrides it; ncurses en- forces an upper limit of 30,000 (30 seconds) when reading the value. The most common instance where you may wish to change this value is to work with a remote host over a slow communication channel. If the host running a curses application does not receive the characters of an escape sequence in a timely manner, the library can interpret them as multiple key stroke events. Conversely, a fast typist on a low-latency connection who happens to input an ESC followed by characters that match an escape sequence may experience confusing application behavior. xterm(1) mouse events are a form of escape sequence; therefore, if your ap- plication makes heavy use of multiple-clicking, you may wish to lengthen the default value because the delay applies to the composite multi-click event as well as the individual clicks. Portable applications should not rely upon the presence of ESCDELAY in ei- ther form, but setting the environment variable rather than the global variable does not create problems when compiling an application. If keypad(3X) is disabled for the curses window receiving input, ESCDELAY is irrelevant and a program must disambiguate escape sequences itself. HOME ncurses may read and write auxiliary terminal descriptions in .termcap and .terminfo files in the user's home directory. LINES This counterpart to COLUMNS specifies the height of the screen in charac- ters. The corresponding terminfo capability and code is lines. See the description of the COLUMNS variable above. MOUSE_BUTTONS_123 (OS/2 EMX port only) OS/2 numbers a three-button mouse inconsistently with other platforms, such that 1 is the left button, 2 the right, and 3 the middle. This variable customizes the mouse button numbering. Its value must be three digits 1-3 in any order. By default, ncurses assumes a num- bering of "132". NCURSES_ASSUMED_COLORS If set, this variable overrides the ncurses library's compiled-in assump- tion that the terminal's default colors are white on black; see default_colors(3X). Set the foreground and background color values with this environment variable by assigning it two integer values separated by a comma, indicating foregound and background color numbers, respectively. For example, to tell ncurses not to assume anything about the colors, use a value of "-1,-1". To make the default color scheme green on black on a terminal that uses ANSI X3.64/ECMA-48/ISO 6429 color assignments, use "2,0". ncurses accepts integral values from -1 up to the value of the terminfo max_colors (colors) capability for the selected terminal type. NCURSES_CONSOLE2 (MinGW port only) The Console2 program defectively handles the Microsoft Console API call CreateConsoleScreenBuffer. Applications that use it will hang. However, it is possible to simulate the action of this call by map- ping coordinates, explicitly saving and restoring the original screen con- tents. Setting the environment variable NCGDB has the same effect. NCURSES_GPM_TERMS (Linux only) When ncurses is configured to use the GPM interface, this variable may list one or more terminal type names, delimited by vertical bars (|) or colons (:), against which the TERM variable (see below) is matched. An empty value disables the GPM interface, using ncurses's built- in support for xterm(1) mouse protocols instead. If the variable is ab- sent, ncurses attempts to open GPM if TERM contains "linux". NCURSES_NO_HARD_TABS ncurses may use tab characters in cursor movement optimization. In some cases, your terminal driver may not handle them properly. Set this envi- ronment variable to any value to disable the feature. You can also adjust your stty(1) settings to avoid the problem. NCURSES_NO_MAGIC_COOKIE Many terminals store video attributes as properties of a character cell, as curses does. Historically, some recorded changes in video attributes as data that logically (but invisibly) occupied character cells on the dis- play, switching attributes on or off, similarly to tags in a markup lan- guage, which then had to be overprinted to depict the cells' desired con- tents; these are termed "magic cookies". If the terminfo entry for your terminal type does not adequately describe its handling of magic cookies, set this variable to any value to instruct ncurses to disable attributes entirely. NCURSES_NO_PADDING Most terminal type descriptions in the terminfo database detail hardware devices. Many people use curses-based applications in terminal emulator programs that run in a windowing environment. These programs can duplicate all of the important features of a hardware terminal, but often lack their limitations. Chief among these absent drawbacks is the problem of data flow management; that is, limiting the speed of communication to what the hardware could handle. Unless a hardware terminal is interfaced into a terminal concentrator (which does flow control), an application must manage flow itself to prevent overruns and data loss. A solution that comes at no hardware cost is for an application to pause transmission after directing a terminal to execute an operation that it performs slowly, such as clearing the display. Many terminal type descrip- tions, including that for the VT100, embed delay specifications in capabil- ities. You may wish to use these terminal descriptions without paying the performance penalty. Set NCURSES_NO_PADDING to any value to disable all but mandatory padding. Mandatory padding is used by such terminal capabil- ities as flash_screen (flash). NCURSES_NO_SETBUF (Obsolete) Prior to internal changes developed in ncurses 5.9 (patches 20120825 through 20130126), the library used setbuf(3) to enable fully buffered output when initializing the terminal. This was done, as in SVr4 curses, to increase performance. For testing purposes, both of ncurses and of certain applications, this feature was made optional. Setting this variable disabled output buffering, leaving the output stream in the origi- nal (usually line-buffered) mode. Nowadays, ncurses performs its own buffering and does not require this workaround; it does not modify the buffering of the standard output stream. This approach makes the library's handling of keyboard-initiated signals more robust. A drawback is that certain unconventional programs mixed stdio(3) calls with ncurses calls and (usually) got the behavior they ex- pected. This is no longer the case; ncurses does not write to the standard output file descriptor through a stdio-buffered stream. As a special case, low-level API calls such as putp(3X) still use the stan- dard output stream. High-level curses calls such as printw(3X) do not. NCURSES_NO_UTF8_ACS At initialization, ncurses inspects the TERM environment variable for spe- cial cases where VT100 forms-drawing characters (and the corresponding al- ternate character set terminfo capabilities) are known to be unsupported by terminal types that otherwise claim VT100 compatibility. Specifically, when running in a UTF-8 locale, the Linux virtual console device and the GNU screen(1) program ignore them. Set this variable to a nonzero value to instruct ncurses that the terminal's ACS support is broken; the library then outputs Unicode code points that correspond to the forms-drawing char- acters. Set it to zero (or a non-integer) to disable the special check for terminal type names matching "linux" or "screen", directing ncurses to as- sume that the ACS feature works if the terminal type description advertises it. As an alternative to use of this variable, ncurses checks for an extended terminfo numeric capability U8 that can be compiled using "tic -x". Exam- ples follow. # 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 two-character name "U8" was chosen to permit its use via ncurses's termcap interface. NCURSES_TRACE At initialization, ncurses (in its debugging configuration) checks for this variable's presence. If defined with an integral value, the library calls curses_trace(3X) with that value as the argument. TERM The TERM variable denotes the terminal type. Each is distinct, though many are similar. It is commonly set by terminal emulators to help applications find a workable terminal description. Some choose a popular approximation such as "ansi", "vt100", or "xterm" rather than an exact fit to their capa- bilities. Not infrequently, an application will have problems with that approach; for example, a key stroke may not operate correctly, or produce no effect but seeming garbage characters on the screen. Setting TERM has no effect on hardware operation; it affects the way appli- cations communicate with the terminal. Likewise, as a general rule (xterm(1) being a rare exception), terminal emulators that allow you to specify TERM as a parameter or configuration value do not change their be- havior to match that setting. TERMCAP If ncurses is configured with termcap support, it checks for a terminal type description in termcap format if one in terminfo format is not avail- able. Setting this variable directs ncurses to ignore the usual termcap database location, /etc/termcap; see TERMPATH below. TERMCAP should con- tain either a terminal description (with newlines stripped out), or a file name indicating where the information required by the TERM environment variable is stored. TERMINFO ncurses can be configured to read terminal type description databases in various locations using different formats. This variable overrides the de- fault location. * Descriptions in terminfo format are normally stored in a directory tree using subdirectories named for the common first letters of the terminal types named therein. System V used this scheme. * If ncurses is configured to use hashed databases, then TERMINFO may name its location, such as /usr/share/terminfo.db, rather than /usr/share/terminfo/. The hashed database uses less disk space and is a little faster than the directory tree. However, some applications assume the existence of the di- rectory tree and read it directly, ignoring the terminfo API. * If ncurses is configured with termcap support, this variable may con- tain the location of a termcap file. * If the value of TERMINFO begins with "hex:" or "b64:", ncurses uses the remainder of the value as a compiled terminfo description. You might produce the base64 format using infocmp(1M). TERMINFO=$(infocmp -0 -Q2 -q) export TERMINFO ncurses uses the compiled description only if it corresponds to the terminal type identified by TERM. Setting TERMINFO is the simplest, but not the only, way to direct ncurses to a terminal database. The search path is as follows. * the last terminal database to which the running ncurses application wrote, if any * the location specified by the TERMINFO environment variable * $HOME/.terminfo * locations listed in the TERMINFO_DIRS environment variable * location(s) configured and compiled into ncurses * @TERMINFO_DIRS@ * /usr/share/misc/terminfo TERMINFO_DIRS This variable specifies a list of locations, akin to PATH, in which ncurses searches for the terminal type descriptions described by TERMINFO above. The list items are separated by colons on Unix and semicolons on OS/2 EMX. System V terminfo lacks a corresponding feature; TERMINFO_DIRS is an ncurses extension. TERMPATH If TERMCAP does not hold a terminal type description or file name, then ncurses checks the contents of TERMPATH, a list of locations, akin to PATH, in which it searches for termcap terminal type descriptions. The list items are separated by colons on Unix and semicolons on OS/2 EMX. If both TERMCAP and TERMPATH are unset or invalid, ncurses searches for the files /etc/termcap, /usr/share/misc/termcap, and $HOME/.termcap, in that order. ALTERNATE CONFIGURATIONS Many different ncurses configurations are possible, determined by the op- tions given to the configure script when building the library. Run the script with the --help option to peruse them all. A few are of particular significance to the application developer employing ncurses. --disable-overwrite Avoid file name conflicts between ncurses and an existing curses in- stallation on the system. The standard C preprocessor inclusion for the curses library is as follows. #include <curses.h> If ncurses is installed disabling overwrite, it puts its header files in a subdirectory. Here is an example. #include <ncurses/curses.h> With --disable-overwrite, installation also omits a symbolic link that would cause the compiler's -lcurses option to link object files with ncurses instead of the system curses library. The directory used by this configuration of ncurses is shown in sec- tion "SYNOPSIS" above. --enable-widec (default for ABI 6+ since 2023-10-21) Enable support for wide charac- ters. The configure script renames the ncurses library (and the tinfo library, if --with-termlib is also specified), appending "w". An ap- plication desirous of wide-character support then uses -lncursesw (or -ltinfow) instead of -lncurses (or -ltinfo) as its linker option. The ncurses++, panel, form, and menu libraries are renamed similarly. An application must also define certain C preprocessor symbols to en- able wide-character features in curses header files to use the ex- tended (wide-character) functions. The symbol that enables these fea- tures has changed since X/Open Curses Issue 4. * Originally, the wide-character feature required the symbol _XOPEN_SOURCE_EXTENDED, but that was valid only for XPG4 (1996). * Later, that was deemed conflicting with an _XOPEN_SOURCE value of 500. * As of mid-2018, no ncurses feature requires a _XOPEN_SOURCE value greater than 600. However, X/Open Curses Issue 7 (2009) recom- mends defining it to 700. * Alternatively, you can enable the feature by defining NCURSES_WIDECHAR with the caveat that some header file other than curses.h may require a specific value for _XOPEN_SOURCE (or a sys- tem-specific symbol). The curses.h header file installed for the wide-character library is designed to be compatible with the non-wide library's header. Only the size of the WINDOW structure differs; few applications require more than pointers to WINDOW. If ncurses's header files are installed allowing overwrite (the de- fault, but see --disable-overwrite above), the wide-character li- brary's headers should be installed last by packaging systems and sim- ilar, to allow applications to be built using either library from the same set of headers. --with-pthread Enable support for multi-threaded applications. The configure script renames the ncurses library (and the tinfo library, if --with-termlib is also specified), appending "t" (before any "w" added by --enable-widec). An application desirous of support for multiple threads of execution then uses, for example, -lncursest (or -ltinfot) instead of -lncurses (or -ltinfo) as its linker option. The ncurses++, panel, form, and menu libraries are renamed similarly. ncursest and ncursestw replace global variables such as LINES with macros allowing read-only access. At the same time, they provide functions to set these values. Very few applications require changes to work with this convention. --with-shared --with-normal --with-debug --with-profile Mandate compilation of the ncurses library (and the tinfo library, if --with-termlib is also specified) in the specified forms. The shared and normal (static) library names differ by their suffixes, as with libncurses.so and libncurses.a. The debugging and profiling libraries add a "_g" and a "_p" to the roots of these respective names, forming libncurses_g.so and libncurses_p.a, for example. The ncurses++, panel, form, and menu libraries are made available similarly. --with-termlib Provide ncurses's lower-level terminal interface functions (those that do not depend on the SCREEN and WINDOW abstractions) in a library named tinfo. This arrangement reduces an application's linking and/or loading times when it does not require curses's higher-level features. The following pages document curses functions provided by tinfo. * curs_extend(3X) - miscellaneous ncurses extensions * curs_inopts(3X) - curses input options * curs_kernel(3X) - low-level curses routines * curs_termattrs(3X) - curses environment query routines * curs_termcap(3X) - curses emulation of termcap * curs_terminfo(3X) - curses interface to terminfo database * curs_util(3X) - miscellaneous curses utility routines --with-trace Expose the curses_trace(3X) function in the ncurses(w) shared and sta- tic libraries. Normally, it is available only in the debugging li- brary. (If --with-termlib is also specified, tinfo(w) rather than ncurses(w) supplies the deprecated trace(3X) function.) An applica- tion's configuration script should check for the function's existence rather than assuming its confinement to the debugging library. FILES /usr/share/tabset tab stop initialization database /usr/share/misc/terminfo compiled terminal capability database NOTES X/Open Curses permits most functions it specifies to be made available as macros as well. ncurses does so * for functions that return values via their parameters, * to support obsolete features, * to reuse functions (for example, those that move the cursor before an- other operation), and * in a few special cases. If the standard output file descriptor of an ncurses program is redirected to something that is not a terminal device, the library writes screen up- dates to the standard error file descriptor. This was an undocumented fea- ture of SVr3 curses. See subsection "Header Files" below regarding symbols exposed by inclusion of curses.h. EXTENSIONS ncurses enables an application to capture mouse events from certain termi- nals, including xterm(1); see curs_mouse(3X). ncurses provides a means of responding to window resizing events, as when running in a GUI terminal emulator application such as xterm; see resizeterm(3X) and wresize(3X). ncurses allows an application to query the terminal for the presence of a wide variety of special keys; see has_key(3X). ncurses extends the fixed set of function key capabilities specified by X/Open Curses by allowing the application programmer to define additional key events at runtime; see define_key(3X), key_defined(3X), keybound(3X), and keyok(3X). ncurses can exploit the capabilities of terminals implementing ISO 6429/ECMA-48 SGR 39 and SGR 49 sequences, which allow an application to reset the terminal to its original foreground and background colors. From a user's perspective, the application is able to draw colored text on a background whose color is set independently, providing better control over color contrasts. See default_colors(3X). An ncurses application can eschew knowledge of SCREEN and WINDOW structure internals, instead using accessor functions such as is_cbreak(3X) and is_scrollok(3X). ncurses enables an application to direct its output to a printer attached to the terminal device; see curs_print(3X). ncurses offers slk_attr(3X) as a counterpart of attr_get(3X) for soft-label key lines, and extended_slk_color(3X) as a form of slk_color(3X) that can gather color information from them when many colors are supported. ncurses permits modification of unctrl(3X)'s behavior; see use_legacy_coding(3X). Rudimentary support for multi-threaded applications may be available; see curs_threads(3X). Functions that ease the management of multiple screens can be exposed; see curs_sp_funcs(3X). To aid applications to debug their memory usage, ncurses optionally offers functions to more aggressively free memory it dynamically allocates itself; see curs_memleaks(3X). The library facilitates auditing and troubleshooting of its behavior; see curs_trace(3X). Compiling ncurses with the option -DUSE_GETCAP causes it to fall back to reading /etc/termcap if the terminal setup code cannot find a terminfo en- try corresponding to TERM. Use of this feature is not recommended, as it essentially includes an entire termcap compiler in the ncurses startup code, at a cost in memory usage and application launch latency. PDCurses and NetBSD curses incorporate some ncurses extensions. Individual man pages indicate where this is the case. PORTABILITY X/Open Curses defines two levels of conformance, "base" and "enhanced". The latter includes several additional features, such as wide-character and color support. ncurses intends base-level conformance with X/Open Curses, and supports all features of its enhanced level except the untic utility. Differences between X/Open Curses and ncurses are documented in the "PORTA- BILITY" sections of applicable man pages. Error Checking In many cases, X/Open Curses is vague about error conditions, omitting some of the SVr4 documentation. Unlike other implementations, ncurses checks pointer parameters, such as those to WINDOW structures, to ensure that they are not null. This is done primarily to guard against programmer error. The standard interface does not provide a way for the library to tell an application which of several possible errors occurred. An application that relies on ncurses to check its function parameters for validity limits its portability and robustness. Padding Differences In historical curses implementations, delays embedded in the terminfo capa- bilities carriage_return (cr), scroll_forward (ind), cursor_left (cub1), form_feed (ff), and tab (ht) activated corresponding delay bits in the Unix terminal driver. ncurses performs all padding by sending NUL bytes to the device. This method is slightly more expensive, but narrows the interface to the Unix kernel significantly and correspondingly increases the pack- age's portability. Header Files The header file curses.h itself includes the header files stdio.h and unctrl.h. X/Open Curses has more to say, The inclusion of curses.h may make visible all symbols from the headers stdio.h, term.h, termios.h, and wchar.h. but does not finish the story. A more complete account follows. * The first curses, in 4BSD, provided a curses.h file. BSD curses code included curses.h and unctrl.h from an internal header file curses.ext, where "ext" abbreviated "externs". The implementations of printw and scanw used undocumented internal functions of the standard I/O library (_doprnt and _doscan), but noth- ing in curses.h itself relied upon stdio.h. * SVr2 curses added newterm, which relies upon stdio.h because its func- tion prototype employs the FILE type. SVr4 curses added putwin and getwin, which also use stdio.h. X/Open Curses specifies all three of these functions. SVr4 curses and X/Open Curses do not require the developer to include stdio.h before curses.h. Both document use of curses as requiring only curses.h. As a result, standard curses.h always includes stdio.h. * X/Open Curses and SVr4 curses are inconsistent with respect to unctrl.h. As noted in curs_util(3X), ncurses includes unctrl.h from curses.h (as SVr4 does). * X/Open Curses's comments about term.h and termios.h may refer to HP-UX and AIX. HP-UX curses includes term.h from curses.h to declare setupterm in curses.h, but ncurses and Solaris curses do not. AIX curses includes term.h and termios.h. Again, ncurses and Solaris curses do not. * X/Open Curses says that curses.h may include term.h, but does not re- quire it to do so. Some programs use functions declared in both curses.h and term.h, and must include both header files in the same translation unit. The header files supplied by ncurses include the standard library head- ers required for its declarations, so ncurses's own header files can be included in any order. For portability even to old AIX systems, in- clude curses.h before term.h. * X/Open Curses says "may make visible" because including a header file does not necessarily make visible all of the symbols in it (consider #ifdef and similar). For instance, ncurses's curses.h may include wchar.h if the proper sym- bol is defined, and if ncurses is configured for wide-character sup- port. If wchar.h is included, its symbols may be made visible depend- ing on the value of the _XOPEN_SOURCE feature test macro. * X/Open Curses mandates an application's inclusion of one standard C li- brary header in a special case: stdarg.h before curses.h to prototype the functions vw_printw and vw_scanw (as well as the obsolete vwprintw and vwscanw). Each of these takes a variadic argument list, a va_list parameter, like that of printf(3). SVr3 curses introduced the two obsolete functions, and X/Open Curses the others. In between, SVr4 curses provided for the possibility that an application might include either varargs.h or stdarg.h. These rep- resented contrasting approaches to handling variadic argument lists. The older interface, varargs.h, used a pointer to char for variadic functions' va_list parameter. Later, the list acquired its own stan- dard data type, va_list, defined in stdarg.h, empowering the compiler to check the types of a function call's actual parameters against the formal ones declared in its prototype. No conforming implementations of X/Open Curses require an application to include stdarg.h before curses.h because they either have allowed for a special type, or, like ncurses, they include stdarg.h themselves to provide a portable interface. AUTHORS Zeyd M. Ben-Halim, Eric S. Raymond, Thomas E. Dickey. Based on pcurses by Pavel Curtis. SEE ALSO curs_variables(3X), terminfo(5), user_caps(5) ncurses 6.6 2025-11-11 ncurses(3X)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ENVIRONMENT | ALTERNATE CONFIGURATIONS | FILES | NOTES | EXTENSIONS | PORTABILITY | AUTHORS | SEE ALSO
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