int insch(chtype ch);
int winsch(WINDOW *win, chtype ch);
int mvinsch(int y, int x, chtype ch);
int mvwinsch(WINDOW *win, int y, int x, chtype ch);
These routines insert the character ch before the character under the
cursor. All characters to the right of the cursor are moved one space to the
right, with the possibility of the rightmost character on the line being lost.
The insertion operation does not change the cursor position.
All routines that return an integer return ERR upon failure and OK (SVr4
specifies only "an integer value other than ERR") upon successful
completion, unless otherwise noted in the preceding routine descriptions.
These routines do not necessarily imply use of a hardware insert character
Comparable functions in the wide-character (ncursesw) library are