Provided by: ncurses-doc_5.9-4_all bug


       add_wch,  wadd_wch,  mvadd_wch,  mvwadd_wch,  echo_wchar,  wecho_wchar  -  add  a  complex
       character and rendition to a curses window, then advance the cursor


       #include <curses.h>

       int add_wch( const cchar_t *wch );
       int wadd_wch( WINDOW *win, const cchar_t *wch );
       int mvadd_wch( int y, int x, const cchar_t *wch );
       int mvwadd_wch( WINDOW *win, int y, int x, const cchar_t *wch );
       int echo_wchar( const cchar_t *wch );
       int wecho_wchar( WINDOW *win, const cchar_t *wch );


       The add_wch, wadd_wch, mvadd_wch, and mvwadd_wch functions put the complex  character  wch
       into  the  given  window at its current position, which is then advanced.  These functions
       perform wrapping and special-character processing as follows:

       ·   If wch refers to a spacing character, then any previous character at that location  is
           removed.   A  new character specified by wch is placed at that location with rendition
           specified by wch.  The cursor then advances to  the  next  spacing  character  on  the

       ·   If wch refers to a non-spacing character, all previous characters at that location are
           preserved.  The non-spacing characters  of  wch  are  added  to  the  spacing  complex
           character, and the rendition specified by wch is ignored.

       ·   If  the character part of wch is a tab, newline, backspace or other control character,
           the window is updated and the cursor moves as if addch were called.

       The echo_wchar function is functionally equivalent to a call to add_wch followed by a call
       to  refresh.   Similarly, the wecho_wchar is functionally equivalent to a call to wadd_wch
       followed by a call to wrefresh.  The knowledge that  only  a  single  character  is  being
       output  is  taken  into  consideration  and,  for  non-control  characters, a considerable
       performance gain might be seen by using the *echo* functions instead of their equivalents.

   Line Graphics
       Like addch(3X), addch_wch accepts symbols which make it simple to  draw  lines  and  other
       frequently  used  special  characters.   These  symbols correspond to the same VT100 line-
       drawing set as addch(3X).

       Name              Unicode    Default   Description
       WACS_BLOCK        0x25ae     #         solid square block
       WACS_BOARD        0x2592     #         board of squares
       WACS_BTEE         0x2534     +         bottom tee
       WACS_BULLET       0x00b7     o         bullet
       WACS_CKBOARD      0x2592     :         checker board (stipple)
       WACS_DARROW       0x2193     v         arrow pointing down
       WACS_DEGREE       0x00b0     '         degree symbol
       WACS_DIAMOND      0x25c6     +         diamond
       WACS_GEQUAL       0x2265     >         greater-than-or-equal-to
       WACS_HLINE        0x2500     -         horizontal line
       WACS_LANTERN      0x2603     #         lantern symbol
       WACS_LARROW       0x2190     <         arrow pointing left
       WACS_LEQUAL       0x2264     <         less-than-or-equal-to
       WACS_LLCORNER     0x2514     +         lower left-hand corner
       WACS_LRCORNER     0x2518     +         lower right-hand corner
       WACS_LTEE         0x2524     +         left tee
       WACS_NEQUAL       0x2260     !         not-equal

       WACS_PI           0x03c0     *         greek pi
       WACS_PLMINUS      0x00b1     #         plus/minus
       WACS_PLUS         0x253c     +         plus
       WACS_RARROW       0x2192     >         arrow pointing right
       WACS_RTEE         0x251c     +         right tee
       WACS_S1           0x23ba     -         scan line 1
       WACS_S3           0x23bb     -         scan line 3
       WACS_S7           0x23bc     -         scan line 7
       WACS_S9           0x23bd     _         scan line 9
       WACS_STERLING     0x00a3     f         pound-sterling symbol
       WACS_TTEE         0x252c     +         top tee
       WACS_UARROW       0x2191     ^         arrow pointing up
       WACS_ULCORNER     0x250c     +         upper left-hand corner
       WACS_URCORNER     0x2510     +         upper right-hand corner
       WACS_VLINE        0x2502     |         vertical line

       The wide-character configuration of ncurses also defines symbols for  thick-  and  double-

       Name              Unicode   Default   Description
       WACS_T_ULCORNER   0x250f    +         thick upper left corner
       WACS_T_LLCORNER   0x2517    +         thick lower left corner
       WACS_T_URCORNER   0x2513    +         thick upper right corner
       WACS_T_LRCORNER   0x251b    +         thick lower right corner
       WACS_T_LTEE       0x252b    +         thick tee pointing right
       WACS_T_RTEE       0x2523    +         thick tee pointing left
       WACS_T_BTEE       0x253b    +         thick tee pointing up
       WACS_T_TTEE       0x2533    +         thick tee pointing down
       WACS_T_HLINE      0x2501    -         thick horizontal line
       WACS_T_VLINE      0x2503    |         thick vertical line
       WACS_T_PLUS       0x254b    +         thick large plus or crossover
       WACS_D_ULCORNER   0x2554    +         double upper left corner
       WACS_D_LLCORNER   0x255a    +         double lower left corner
       WACS_D_URCORNER   0x2557    +         double upper right corner
       WACS_D_LRCORNER   0x255d    +         double lower right corner
       WACS_D_RTEE       0x2563    +         double tee pointing left
       WACS_D_LTEE       0x2560    +         double tee pointing right
       WACS_D_BTEE       0x2569    +         double tee pointing up
       WACS_D_TTEE       0x2566    +         double tee pointing down
       WACS_D_HLINE      0x2550    -         double horizontal line
       WACS_D_VLINE      0x2551    |         double vertical line
       WACS_D_PLUS       0x256c    +         double large plus or crossover


       All routines return the integer ERR upon failure and OK on success.

       Functions  with  a  "mv" prefix first perform a cursor movement using wmove, and return an
       error if the position is outside the window, or if the window pointer is null.


       Note that add_wch, mvadd_wch, mvwadd_wch, and echo_wchar may be macros.


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

       X/Open  Curses  makes  it  clear  that the WACS_ symbols should be defined as a pointer to
       cchar_t  data,  e.g.,  in  the  discussion  of  border_set.   A  few  implementations  are

       ·   NetBSD curses defines the symbols as a wchar_t within a cchar_t.

       ·   HPUX  curses equates some of the ACS_ symbols to the analogous WACS_ symbols as if the
           ACS_ symbols were wide characters.  The misdefined symbols are the  arrows  and  other
           symbols which are not used for line-drawing.

       X/Open   Curses  does  not  define  symbols  for  thick-  or  double-lines.   SVr4  curses
       implementations defined their line-drawing symbols in terms of intermediate symbols.  This
       implementation  extends those symbols, providing new definitions which are not in the SVr4


       ncurses(3NCURSES), addch(3NCURSES),  attr(3NCURSES),  clear(3NCURSES),  outopts(3NCURSES),
       refresh(3NCURSES), putwc(3)