insstr([y, x,] str, [attr])
Insert the string before the current or specified position.
y
Y-coordinate.
x
X-coordinate.
str
String to insert.
attr
Attributes for characters.
Insert a character string (as many characters as will fit on the
line) before the character under the cursor. All characters to the
right of the cursor are shifted right, with the rightmost characters
on the line being lost. The cursor position does not change (after
moving to y, x, if specified).