+ <STRONG>slk_label</STRONG>
+ returns <STRONG>NULL</STRONG> on error.
+
+ <STRONG>slk_set</STRONG>
+ returns an error if the terminal or the softkeys were not ini-
+ tialized, or the <EM>labnum</EM> parameter is outside the range of label
+ counts, or if the format parameter is outside the range 0..2,
+ or if memory for the labels cannot be allocated.
+
+
+</PRE><H2><a name="h2-EXTENSIONS">EXTENSIONS</a></H2><PRE>
+ X/Open Curses documents the <EM>opts</EM> argument as reserved for future use,
+ saying that it must be null. This implementation uses that parameter
+ in ABI 6 for the functions which have a color-pair parameter to support
+ extended color pairs.
+
+ For functions which modify the color, e.g., <STRONG>slk_attr_set</STRONG>, if <EM>opts</EM> is
+ set it is treated as a pointer to <STRONG>int</STRONG>, and used to set the color
+ pair instead of the <STRONG>short</STRONG> pair parameter.
+
+
+</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
+ Most applications would use <STRONG>slk_noutrefresh</STRONG> because a <STRONG>wrefresh</STRONG> is like-
+ ly to follow soon.
+
+
+</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
+ The XSI Curses standard, Issue 4, described the soft-key functions,
+ with some differences from SVr4 curses:
+
+ <STRONG>o</STRONG> It added functions like the SVr4 attribute-manipulation functions
+ <STRONG>slk_attron</STRONG>, <STRONG>slk_attroff</STRONG>, <STRONG>slk_attrset</STRONG>, but which use <STRONG>attr_t</STRONG> parame-
+ ters (rather than <STRONG>chtype</STRONG>), along with a reserved <EM>opts</EM> parameter.
+
+ Two of these new functions (unlike the SVr4 functions) have no pro-
+ vision for color: <STRONG>slk_attr_on</STRONG> and <STRONG>slk_attr_off</STRONG>.
+
+ The third function (<STRONG>slk_attr_set</STRONG>) has a color-pair parameter.
+
+ <STRONG>o</STRONG> It added <STRONG>const</STRONG> qualifiers to parameters (unnecessarily), and
+
+ <STRONG>o</STRONG> It added <STRONG>slk_color</STRONG>.
+
+ The format codes <STRONG>2</STRONG> and <STRONG>3</STRONG> for <STRONG>slk_init</STRONG> and the function <STRONG>slk_attr</STRONG> are
+ specific to ncurses.
+
+ X/Open Curses does not specify a limit for the number of colors and
+ color pairs which a terminal can support. However, in its use of <STRONG>short</STRONG>
+ for the parameters, it carries over SVr4's implementation detail for
+ the compiled terminfo database, which uses signed 16-bit numbers. This
+ implementation provides extended versions of those functions which use
+ <STRONG>short</STRONG> parameters, allowing applications to use larger color- and pair-
+ numbers.
+
+
+</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
+ <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_attr.3x.html">curs_attr(3x)</A></STRONG>, <STRONG><A HREF="curs_initscr.3x.html">curs_initscr(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>,
+ <STRONG><A HREF="curs_variables.3x.html">curs_variables(3x)</A></STRONG>.