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curs_addch(3)							 curs_addch(3)

       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
       advanced.  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
       appropriately 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
       character 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
       another using inch and addch.)  See the curs_attr(3) 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
       output is used and, for non-control characters, a considerable
       performance gain may be seen by using these routines instead of their

   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

       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
       successful completion, unless otherwise noted in the preceding routine

       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(3).

       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(3), curs_attr(3), curs_clear(3), curs_inch(3), curs_outopts(3),
       curs_refresh(3), putc(3).

       Comparable functions in the wide-character (ncursesw) library are
       described in curs_add_wch(3).

								 March 1, 2011

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