https://invisible-island.net/ncurses/man/
curs_addchstr(3x) Library calls curs_addchstr(3x)
addchstr, waddchstr, mvaddchstr, mvwaddchstr, addchnstr, waddchnstr,
mvaddchnstr, mvwaddchnstr - add a curses character string to a window
#include <curses.h>
int addchstr(const chtype * chstr);
int waddchstr(WINDOW * win, const chtype * chstr);
int mvaddchstr(int y, int x, const chtype * chstr);
int mvwaddchstr(WINDOW * win, int y, int x, const chtype * chstr);
int addchnstr(const chtype * chstr, int n);
int waddchnstr(WINDOW * win, const chtype * chstr, int n);
int mvaddchnstr(int y, int x, const chtype * chstr, int n);
int mvwaddchnstr(WINDOW * win, int y, int x, const chtype * chstr, int n);
waddchstr copies the string of curses characters chstr to the window
win. A null curses character terminates the string. waddchnstr does
the same, but copies at most n characters, or as many as possible if n
is -1. ncurses(3x) describes the variants of these functions.
Because these functions do not call waddch(3x) internally, they are
faster than waddstr(3x) and waddnstr(3x). On the other hand, they
o do not treat the backspace, carriage return, or line feed
characters specially;
o do not represent unprintable characters with unctrl(3x);
o do not update the cursor position to follow the last character
written;
o truncate the string at the window's right margin, rather than
wrapping it to the next line and potentially scrolling.
These functions return OK on success and ERR on failure.
In ncurses, they return ERR if
o win is NULL or
o chstr is NULL.
Functions prefixed with "mv" first perform cursor movement and fail if
the position (y, x) is outside the window boundaries.
All of these functions except waddchnstr may be implemented as macros.
X/Open Curses, Issue 4 describes these functions. It specifies no
error conditions for them.
SVr3.1 (1987) introduced waddchstr and waddchnstr.
curs_add_wchstr(3x) describes comparable functions of the ncurses
library in its wide-character configuration (ncursesw).
curses(3x), curs_addch(3x), curs_addstr(3x)
ncurses 6.5 2024-07-27 curs_addchstr(3x)