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

## SYNOPSIS

           #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);

## DESCRIPTION

           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  mar-
           gin,  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 cur-
           sor 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 con-
           sidered 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 character does not return the char-
           acter  itself, but instead returns the ^-representation of
           the control character.  (To emit control characters liter-
           ally, use echochar.)

           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(3X) page for values of prede-
           fined video attribute constants that can be usefully OR'ed
           into characters.

           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

       Line Graphics
           The  following  variables  may be used to add line drawing
           characters to the screen with routines of the  addch  fam-
           ily.   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.

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

## RETURN VALUE

           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 other-
           wise noted in the preceding routine descriptions.

## NOTES

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

## EXTENSIONS

           The following extended curses features are available  only
           on  PC-clone consoles and compatible terminals obeying the
           ANSI.SYS de-facto standard for terminal control sequences.
           They are not part of XSI curses.

           The attribute A_ALTCHARSET actually forces literal display
           of PC ROM characters  including  the  high-half  graphics.
           the card-suit characters, up and down-arrow, and most oth-
           ers in the range 0-32.  (In a terminfo entry designed  for
           use  with  ncurses,  the high-half characters are obtained
           using this attribute with an acsc string in which the sec-
           ond of each pair is a high-half character.)

           Giving  wechochar  an  argument with its high bit set will
           produce the corresponding high-half  ASCII  graphic  (SVr4
           curses also has this feature but does not document it).  A
           control-character argument, however,  will  not  typically
           produce  the corresponding graphic; characters such as CR,
           NL, FF and TAB are typically interpreted  by  the  console
           driver  itself,  and ESC will be interpreted as the leader
           of a control sequence.

## PORTABILITY

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

           The seven ACS symbols starting with ACS_S3 were not  docu-
           mented  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).

## SEE ALSO

           curses(3X), curs_attr(3X), curs_clear(3X),  curs_inch(3X),
           curs_outopts(3X), curs_refresh(3X), putc(3S).