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

       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 doesn't define a  terminal-
       specific	 replacement  for  it  (but see	the EXTENSIONS section below).
       The names are taken from	VT100 nomenclature.

       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).

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



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