- The effect of <EM>get</EM><STRONG>_</STRONG><EM>wstr()</EM> is as though a series of calls to
- <EM>get</EM><STRONG>_</STRONG><EM>wch()</EM> were made, until a newline character, end-of-line
- character, or end-of-file character is processed.
+ The effect of <STRONG>get_wstr</STRONG> is as though a series of calls to <STRONG>get_wch</STRONG>
+ were made, until a newline character, end-of-line character, or
+ end-of-file character is processed.
+
+ The latter function <EM>get</EM><STRONG>_</STRONG><EM>wch</EM> can return a negative value, while <STRONG>wchar_t</STRONG>
+ is a unsigned type. All of the vendors implement this using <STRONG>wint_t</STRONG>,
+ following the standard.
+
+ X/Open Curses, Issue 7 (2009) is unclear regarding whether the termi-
+ nating <EM>null</EM> <STRONG>wchar_t</STRONG> value is counted in the length parameter <EM>n</EM>. X/Open
+ Curses, Issue 7 revised the corresponding description of <STRONG>wgetnstr</STRONG> to
+ address this issue. The unrevised description of <STRONG>wget_nwstr</STRONG> can be in-
+ terpreted either way. This implementation counts the terminator in the
+ length.
+
+ X/Open Curses does not specify what happens if the length <EM>n</EM> is nega-
+ tive.
+
+ <STRONG>o</STRONG> For analogy with <STRONG>wgetnstr</STRONG>, ncurses 6.2 uses a limit (based on
+ <STRONG>LINE_MAX</STRONG>).
+
+ <STRONG>o</STRONG> Some other implementations (such as Solaris xcurses) do the same,
+ while others (PDCurses) do not allow this.