NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | PORTABILITY | SEE ALSO | COLOPHON

curs_add_wch(3X)                                            curs_add_wch(3X)

NAME         top

       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

SYNOPSIS         top

       #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 );

DESCRIPTION         top

   add_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 screen.

       ·   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.

   echo_wchar
       The echo_wchar function is functionally equivalent to a call to
       add_wch followed by a call to refresh(3X).  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-lines:

       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

RETURN VALUE         top

       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.

NOTES         top

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

PORTABILITY         top

       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 problematic:

       ·   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
       implementations.

SEE ALSO         top

       curses(3X), curs_addch(3X), curs_attr(3X), curs_clear(3X),
       curs_outopts(3X), curs_refresh(3X), putwc(3)

COLOPHON         top

       This page is part of the ncurses (new curses) project.  Information
       about the project can be found at 
       ⟨https://www.gnu.org/software/ncurses/ncurses.html⟩.  If you have a
       bug report for this manual page, send it to
       bug-ncurses-request@gnu.org.  This page was obtained from the
       project's upstream Git mirror of the CVS repository 
       ⟨git://ncurses.scripts.mit.edu/ncurses.git⟩ on 2017-03-13.  If you
       discover any rendering problems in this HTML version of the page, or
       you believe there is a better or more up-to-date source for the page,
       or you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail
       to man-pages@man7.org

                                                            curs_add_wch(3X)