curs_in_wchstr(3X)

NAME
in_wchstr, in_wchnstr, win_wchstr, win_wchnstr, mvin_wchstr, mvin_wchnstr, mvwin_wchstr, mvwin_wchnstr - get a curses complex character string from a window

SYNOPSIS
#include <curses.h>

int in_wchstr(cchar_t *wchstr);
int win_wchstr(WINDOW *win, cchar_t *wchstr);
int mvin_wchstr(int y, int x, cchar_t *wchstr);
int mvwin_wchstr(WINDOW *win, int y, int x, cchar_t *wchstr);

int in_wchnstr(cchar_t *wchstr, int n);
int win_wchnstr(WINDOW *win, cchar_t *wchstr, int n);
int mvin_wchnstr(int y, int x, cchar_t *wchstr, int n);
int mvwin_wchnstr(WINDOW *win, int y, int x, cchar_t *wchstr, int n);

DESCRIPTION
These functions return an array of complex characters in wchstr, starting at the current cursor position in the named window. Attributes (rendition) are stored with the characters.

The four functions with n as the last argument return a leading substring at most n characters long (exclusive of the trailing zeroed cchar_t. Transfer stops at the end of the current line, or when n characters have been stored at the location referenced by wchstr.

Constants defined in <curses.h> can be used with the & (logical “and”) operator to extract the character or the attribute alone from any position in the wchstr [see getcchar(3X)].

RETURN VALUE
These functions return OK on success and ERR on failure.

ncurses returns ERR 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.

NOTES
All of these functions except win_wchnstr may be implemented as macros.

Reading a line that overflows the array pointed to by wchstr and its variants causes undefined results. Instead, use the n-infixed functions with a positive n argument no larger than the size of the buffer backing wchstr.

PORTABILITY
X/Open Curses Issue 4 describes these functions. It specifies no error conditions for them.

HISTORY
X/Open Curses Issue 4 (1995) initially specified these functions. The System V Interface Definition Version 4 of the same year specified a function named winwchstr (and the usual variants). This was a later addition to SVr4.x, not appearing in the first SVr4 (1989). It differed from X/Open's later win_wchstr in that it took an argument of type pointer-to-chtype instead of pointer-tocchar_t.

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

curses(3X), curs_inwstr(3X), curs_in_wch(3X)