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

curs_add_wch(3X)														  curs_add_wch(3X)

NAME
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
#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
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(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 func- tionally 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.
RETURN VALUES
All routines return the integer ERR upon failure and OK on success.
NOTES
Note that add_wch, mvadd_wch, mvwadd_wch, and echo_wchar may be macros.
PORTABILITY
All these functions are described in the XSI Curses standard, Issue 4. The defaults specified 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.
SEE ALSO
curses(3X), curs_attr_get(3X), curs_clear(3X), curs_outopts(3X), curs_refresh(3X), putwc(3) curs_add_wch(3X)

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