These routines copy chstr into the window image structure at and after the current cursor position. The four routines with n as the last argument copy at most n elements, but no more than will fit on the line. If n=-1 then the whole string is copied, to the maximum number of characters that will fit on the line.
The window cursor is not advanced, and these routines work faster than waddnstr. On the other hand, they dont perform any kind of checking (such as for the newline, backspace, or carriage return characters), they dont advance the current cursor position, they dont expand other control characters to ^-escapes, and they truncate the string if it crosses the right margin, rather then wrapping it around to the new line.
All routines return the integer ERR upon failure and OK on success (the SVr4 manuals specify only "an integer value other than ERR") upon successful completion, unless otherwise noted in the preceding routine descriptions.
Note that all routines except waddchnstr may be macros.
All these entry points are described in the XSI Curses standard, Issue 4.