+ Applications employing <EM>ncurses</EM> extensions should condition their use on
+ the visibility of the <STRONG>NCURSES_VERSION</STRONG> preprocessor macro.
+
+ X/Open Curses, Issue 4 describes these functions. It specifies no
+ error conditions for them.
+
+ Notwithstanding the foregoing, X/Open Curses Issues 4 and 7 both state
+ that <STRONG>innwstr</STRONG>, <STRONG>winnwstr</STRONG>, <STRONG>mvinnwstr</STRONG>, and <STRONG>mvwinnwstr</STRONG> "fail ... [i]f the
+ array is not large enough to contain any complete characters".
+ Strictly interpreted, this means that a caller of these functions
+ cannot use their return values to detect truncation of a wide-character
+ string copied from more than one character cell in <EM>win</EM>. <EM>ncurses</EM>
+ reports any truncation with <STRONG>ERR</STRONG>.
+
+ X/Open Curses specifies <STRONG>inwstr</STRONG>, <STRONG>winwstr</STRONG>, <STRONG>mvinwstr</STRONG>, and <STRONG>mvwinwstr</STRONG> as
+ returning <STRONG>OK</STRONG> rather than a (wide) character count, unlike their non-
+ wide counterparts <STRONG>instr</STRONG>, <STRONG>winstr</STRONG>, <STRONG>mvinstr</STRONG>, and <STRONG>mvwinstr</STRONG>. <EM>ncurses</EM>
+ regards this inconsistency as an error in the standard.