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
Functions with a “mv” prefix first perform a cursor movement
using wmove, and return an error if the position is outside the
window, or if the window pointer is null.
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