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CURSES_SLK(3)              Library Functions Manual              CURSES_SLK(3)

NAME
     slk_attroff, slk_attr_off, slk_attron, slk_attr_on, slk_attrset,
     slk_attr_set, slk_clear, slk_color, slk_init, slk_label, slk_noutrefresh,
     slk_refresh, slk_restore, slk_set, slk_touch, slk_wset - Curses soft
     label key routines

LIBRARY
     Curses Library (libcurses, -lcurses)

SYNOPSIS
     #include <curses.h>

     int
     slk_attroff(const chtype attr);

     int
     slk_attr_off(const attr_t attr, void *opt);

     int
     slk_attron(const chtype attr);

     int
     slk_attr_on(const attr_t attr, void *opt);

     int
     slk_attrset(const chtype attr);

     int
     slk_attr_set(const attr_t attr, void *opt);

     void
     slk_clear(void);

     int
     slk_color(short pair);

     int
     slk_init(int fmt);

     char *
     slk_label(int labnum);

     int
     slk_noutrefresh(void);

     int
     slk_refresh(void);

     int
     slk_restore(void);

     int
     slk_set(int labnum, const char *label, int justify);

     int
     slk_touch(void);

     int
     slk_wset(int labnum, const wchar_t *label, int justify);

DESCRIPTION
     This Curses interface manipulates the set of soft function-key labels
     that exist on some terminals.  For those terminals that do not have soft
     labels, Curses takes over the bottom line of stdstr, reducing the size of
     stdscr and the value of the LINES external variable.  There can be up to
     eight labels of up to eight display columns each.

     To use soft labels, slk_init() must be called before initscr(3),
     newterm(3), or ripoffline(3) is called.  If newterm(3) eventually uses a
     line from stdscr to emulate the soft labels, then fmt determines how the
     labels are arranged on the screen from the following list:
     0    indicates a 3-2-3 arrangement.
     1    indicates a 4-4 arrangement.

     The slk_set() and slk_wset() functions specify the text of soft label
     number labnum, within the range from 1 to 8 inclusive.  The label
     argument is the string to be put on the label.  The justify argument can
     have the following values to indicate how to justify label within the
     space reserved for it:
     0    Left align.
     1    Center align.
     2    Right align.

     The slk_refresh() and slk_noutrefresh() functions correspond to the
     wrefresh(3) and wnoutrefresh(3) functions.

     The slk_label() function returns a pointer to the text displayed in the
     label.

     The slk_clear() function immediately clears the soft labels from the
     screen.

     The slk_restore() function immediately restores the soft labels to the
     screen after a call to slk_clear().

     The slk_touch() function forces all soft labels to be output the next
     time slk_noutrefresh() or slk_refresh() is called.

     The slk_attron(), slk_attrset() and slk_attroff() functions correspond to
     attron(3), attrset(3) and attroff(3).  The have an effect only if soft
     labels are simulated on the bottom line of the screen.

     The slk_attr_on(), slk_attr_set(), slk_color() and slk_attr_off()
     functions correspond to attr_on(3), attr_set(3), color_set(3) and
     attr_off(3) and thus support the attribute constants with the WA_ prefix
     and color.  The have an effect only if soft labels are simulated on the
     bottom line of the screen.

     The opt argument is reserved for future use.  Currently the application
     must provide a NULL pointer as opt.

RETURN VALUES
     Functions returning pointers will return NULL if an error is detected.
     The functions that return an int will return one of the following values:

     OK   The function completed successfully.
     ERR  An error occurred in the function.

SEE ALSO
     terminfo(5)

NOTES
     This has not been tested on a terminal with real soft label keys.
     label_height, label_width, label_format and lab_f* are currently not
     used.

STANDARDS
     The NetBSD Curses library complies with the X/Open Curses specification,
     part of the Single Unix Specification.

HISTORY
     The Curses package appeared in 4.0BSD.  The soft label key functions were
     added in NetBSD 8.0.

NetBSD 8.0                     January 12, 2017                     NetBSD 8.0