+ <STRONG>sysconf</STRONG> is available, <EM>ncurses</EM> uses the POSIX value for <STRONG>LINE_MAX</STRONG> (a
+ 2048 byte limit). In either case, it reserves a byte for the
+ terminating NUL.
+
+ Although <STRONG>getnstr</STRONG> is equivalent to a series of calls to <STRONG>getch</STRONG>, it also
+ makes changes to the curses modes to allow simple editing of the input
+ buffer:
+
+ <STRONG>o</STRONG> <STRONG>getnstr</STRONG> saves the current value of the <STRONG>nl</STRONG>, <STRONG>echo</STRONG>, <STRONG>raw</STRONG> and <STRONG>cbreak</STRONG>
+ modes, and sets <STRONG>nl</STRONG>, <STRONG>noecho</STRONG>, <STRONG>noraw</STRONG>, and <STRONG>cbreak</STRONG>.
+
+ <STRONG>getnstr</STRONG> handles the echoing of characters, rather than relying on
+ the caller to set an appropriate mode.
+
+ <STRONG>o</STRONG> It also obtains the <EM>erase</EM> and <EM>kill</EM> characters from <STRONG>erasechar</STRONG> and
+ <STRONG>killchar</STRONG>, respectively.
+
+ <STRONG>o</STRONG> On return, <STRONG>getnstr</STRONG> restores the modes to their previous values.
+
+ Other implementations differ in their treatment of special characters:
+
+ <STRONG>o</STRONG> While they may set the <EM>echo</EM> mode, other implementations do not
+ modify the <EM>raw</EM> mode, They may take the <EM>cbreak</EM> mode set by the
+ caller into account when deciding whether to handle echoing within
+ <STRONG>getnstr</STRONG> or as a side-effect of the <STRONG>getch</STRONG> calls.
+
+ <STRONG>o</STRONG> The original <EM>ncurses</EM> (as <EM>pcurses</EM> in 1986) set <STRONG>noraw</STRONG> and <STRONG>cbreak</STRONG> when
+ accepting input for <STRONG>getnstr</STRONG>. That may have been done to make
+ function- and cursor-keys work; it is not necessary with <EM>ncurses</EM>.
+
+ Since 1995, <EM>ncurses</EM> has provided signal handlers for INTR and QUIT
+ (e.g., <STRONG>^C</STRONG> or <STRONG>^\</STRONG>). With the <STRONG>noraw</STRONG> and <STRONG>cbreak</STRONG> settings, those may
+ catch a signal and stop the program, where other implementations
+ allow one to enter those characters in the buffer.
+
+ <STRONG>o</STRONG> Starting in 2021 (<EM>ncurses</EM> 6.3), <STRONG>getnstr</STRONG> sets <STRONG>raw</STRONG>, rather than <STRONG>noraw</STRONG>
+ and <STRONG>cbreak</STRONG> for better compatibility with SVr4-curses, e.g.,
+ allowing one to enter a <STRONG>^C</STRONG> into the buffer.