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RedHat 9 (Linux i386) - man page for add_wch (redhat section 3X)

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curs_add_wch(3X)								 curs_add_wch(3X)

       add_wch,  wadd_wch, mvadd_wch, mvwadd_wch, echo_wchar, wecho_wchar - add a complex charac-
       ter 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(3X) 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  out-
       put  is	taken  into consideration and, for non-control characters, a considerable perfor-
       mance gain might be seen by using the *echo* functions instead of their equivalents.

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

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

       All these functions are described in the XSI Curses standard, Issue 4.  The defaults spec-
       ified for forms-drawing characters apply in the POSIX locale.

       XSI  documents  constants beginning with WACS_ which are used for line-drawing.	Those are
       not currently implemented in ncurses.

       curses(3X),   curs_attr_get(3X),   curs_clear(3X),   curs_outopts(3X),	curs_refresh(3X),

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