curs_add_wchstr(3X) Library calls curs_add_wchstr(3X)

add_wchstr, add_wchnstr, wadd_wchstr, wadd_wchnstr, mvadd_wchstr, mvadd_wchnstr, mvwadd_wchstr, mvwadd_wchnstr - add a curses complex character string to a window

#include <curses.h>
int add_wchstr(const cchar_t *wchstr);
int wadd_wchstr(WINDOW * win, const cchar_t *wchstr);
int mvadd_wchstr(int y, int x, const cchar_t *wchstr);
int mvwadd_wchstr(WINDOW *win, int y, int x, const cchar_t *wchstr);
int add_wchnstr(const cchar_t *wchstr, int n);
int wadd_wchnstr(WINDOW * win, const cchar_t *wchstr, int n);
int mvadd_wchnstr(int y, int x, const cchar_t *wchstr, int n);
int mvwadd_wchnstr(WINDOW *win, int y, int x, const cchar_t *wchstr, int n);

These functions copy the (null-terminated) array of complex characters wchstr into the window image structure starting at the current cursor position.

The four functions with n as the last argument copy at most n elements, but no more than will fit on the line. If n=-1 then the whole array is copied, to the maximum number of characters that will fit on the line.

The window cursor is not advanced. These functions are faster than waddnstr. On the other hand:

  • they do not perform checking (such as for the newline, backspace, or carriage return characters),
  • they do not advance the current cursor position,
  • they do not expand other control characters to ^-escapes, and
  • they truncate the string if it crosses the right margin, rather than wrapping it around to the new line.

These functions end successfully on encountering a null cchar_t, or when they have filled the current line. If a complex character cannot completely fit at the end of the current line, the remaining columns are filled with the background character and rendition.

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

X/Open Curses does not specify any error conditions. This implementation returns an error

  • if the win parameter is null or
  • if the wchstr parameter is null.

Functions prefixed with “mv” first perform cursor movement and fail if the position (y, x) is outside the window boundaries.

All functions except wadd_wchnstr may be macros.

These functions are described in X/Open Curses, Issue 4.

curs_addchstr(3X) describes comparable functions of the ncurses library in its non-wide-character configuration.

curses(3X), curs_addwstr(3X), curs_add_wch(3X)

2024-04-20 ncurses 6.5