https://invisible-island.net/ncurses/man/
curs_insstr(3x) Library calls curs_insstr(3x)
insstr, insnstr, winsstr, winsnstr, mvinsstr, mvinsnstr, mvwinsstr,
mvwinsnstr - insert a string in a curses window
#include <curses.h>
int insstr(const char *str);
int insnstr(const char *str, int n);
int winsstr(WINDOW *win, const char *str);
int winsnstr(WINDOW *win, const char *str, int n);
int mvinsstr(int y, int x, const char *str);
int mvinsnstr(int y, int x, const char *str, int n);
int mvwinsstr(WINDOW *win, int y, int x, const char *str);
int mvwinsnstr(WINDOW *win, int y, int x, const char *str, int n);
These routines insert a character string (as many characters as will
fit on the line) before the character under the cursor, as if calling
winsch(3x). All characters to the right of the cursor are shifted
right, with the possibility of the rightmost characters on the line
being lost. No wrapping is performed.
The cursor position does not change (after moving to y, x, if
specified).
The functions with n as the last argument insert a leading substring of
at most n characters. If n is less than zero, the entire string is
inserted (stopping on a NUL character).
Special characters are handled as in waddch(3x).
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
o if the win parameter is null or
o if the str parameter is null or
o the winsch(3x) function returns an error.
Functions with a "mv" prefix first perform a cursor movement using
wmove(3x), and return an error if the position is outside the window,
or if the window pointer is null.
All but winsnstr may be macros.
These functions are described in the XSI Curses standard, Issue 4,
which adds const qualifiers to the arguments.
The Single Unix Specification, Version 2 states that insnstr and
winsnstr perform wrapping. This is probably an error, since it makes
this group of functions inconsistent. Also, no implementation of
curses documents this inconsistency.
X/Open states that the entire string is inserted if n is less than 1.
This is probably an error, because it is inconsistent with other
functions, and differs from the SVr4 and X/Open implementations on
Solaris.
curses(3x), curs_inch(3x), curs_ins_wstr(3x), curs_util(3x)
ncurses 6.4 2024-03-16 curs_insstr(3x)