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curs_addch(3X)							curs_addch(3X)

       addch, waddch, mvaddch, mvwaddch, echochar, wechochar - add a character
       (with attributes) to a curses window, then advance the cursor

       #include	<curses.h>

       int addch(const chtype ch);
       int waddch(WINDOW *win, const chtype ch);
       int mvaddch(int y, int x, const chtype ch);
       int mvwaddch(WINDOW *win, int y,	int x, const chtype ch);
       int echochar(const chtype ch);
       int wechochar(WINDOW *win, const	chtype ch);

       The addch, waddch, mvaddch and mvwaddch routines	put the	 character  ch
       into the	given window at	its current window position, which is then ad-
       vanced.	They are analogous to putchar in stdio(3).  If the advance  is
       at the right margin, the	cursor automatically wraps to the beginning of
       the next	line.  At the bottom  of  the  current	scrolling  region,  if
       scrollok	is enabled, the	scrolling region is scrolled up	one line.

       If  ch  is  a tab, newline, or backspace, the cursor is moved appropri-
       ately within the	window.	 Backspace  moves  the	cursor	one  character
       left;  at  the  left  edge of a window it does nothing.	Newline	does a
       clrtoeol, then moves the	cursor to the window left margin on  the  next
       line, scrolling the window if on	the last line.	Tabs are considered to
       be at every eighth column.  The tab interval may	be altered by  setting
       the TABSIZE variable.

       If  ch  is any control character	other than tab,	newline, or backspace,
       it is drawn in ^X notation.  Calling winch after	adding a control char-
       acter  does  not	 return	 the character itself, but instead returns the
       ^-representation	of the control character.

       Video attributes	can be combined	with a character  argument  passed  to
       addch  or  related  functions by	logical-ORing them into	the character.
       (Thus, text, including attributes, can be copied	from one place to  an-
       other  using inch and addch.)  See the curs_attr(3X) page for values of
       predefined video	attribute constants that can be	 usefully  OR'ed  into

       The  echochar  and wechochar routines are equivalent to a call to addch
       followed	by a call to refresh, or a call	to waddch followed by  a  call
       to  wrefresh.  The knowledge that only a	single character is being out-
       put is used and,	for non-control	characters, a considerable performance
       gain may	be seen	by using these routines	instead	of their equivalents.

   Line	Graphics
       The  following  variables may be	used to	add line drawing characters to
       the screen with routines	of the addch family.   The  default  character
       listed below is used if the acsc	capability does	not define a terminal-
       specific	replacement for	it.  The names are taken from VT100  nomencla-

       Name	      Default	Description
       ACS_BLOCK      #		solid square block
       ACS_BOARD      #		board of squares
       ACS_BTEE	      +		bottom tee
       ACS_BULLET     o		bullet

       ACS_CKBOARD    :		checker	board (stipple)
       ACS_DARROW     v		arrow pointing down
       ACS_DEGREE     '		degree symbol
       ACS_DIAMOND    +		diamond
       ACS_GEQUAL     >		greater-than-or-equal-to
       ACS_HLINE      -		horizontal line
       ACS_LANTERN    #		lantern	symbol
       ACS_LARROW     <		arrow pointing left
       ACS_LEQUAL     <		less-than-or-equal-to
       ACS_LLCORNER   +		lower left-hand	corner
       ACS_LRCORNER   +		lower right-hand corner
       ACS_LTEE	      +		left tee
       ACS_NEQUAL     !		not-equal
       ACS_PI	      *		greek pi
       ACS_PLMINUS    #		plus/minus
       ACS_PLUS	      +		plus
       ACS_RARROW     >		arrow pointing right
       ACS_RTEE	      +		right tee
       ACS_S1	      -		scan line 1
       ACS_S3	      -		scan line 3
       ACS_S7	      -		scan line 7
       ACS_S9	      _		scan line 9
       ACS_STERLING   f		pound-sterling symbol
       ACS_TTEE	      +		top tee
       ACS_UARROW     ^		arrow pointing up
       ACS_ULCORNER   +		upper left-hand	corner
       ACS_URCORNER   +		upper right-hand corner
       ACS_VLINE      |		vertical line

       All routines return the integer ERR upon	failure	and OK on success (the
       SVr4 manuals specify only "an integer value other than ERR") upon  suc-
       cessful completion, unless otherwise noted in the preceding routine de-

       Note that addch,	mvaddch, mvwaddch, and echochar	may be macros.

       All these functions are described in the	XSI Curses standard, Issue  4.
       The  defaults specified for forms-drawing characters apply in the POSIX

       Some ACS	 symbols  (ACS_S3,  ACS_S7,  ACS_LEQUAL,  ACS_GEQUAL,  ACS_PI,
       ACS_NEQUAL,  ACS_STERLING) were not documented in any publicly released
       System V.  However, many	 publicly  available  terminfos	 include  acsc
       strings	in  which  their  key characters (pryz{|}) are embedded, and a
       second-hand list	of their character descriptions	 has  come  to	light.
       The ACS-prefixed	names for them were invented for ncurses(3X).

       The  TABSIZE variable is	implemented in some versions of	curses,	but is
       not part	of X/Open curses.

       If ch is	a carriage return, the cursor is moved to the beginning	of the
       current	row of the window.  This is true of other implementations, but
       is not documented.

       curses(3X),  curs_attr(3X),  curs_clear(3X),  curs_inch(3X),  curs_out-
       opts(3X), curs_refresh(3X), putc(3).

       Comparable  functions  in the wide-character (ncursesw) library are de-
       scribed in curs_add_wch(3X).



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