slk_init, slk_set, slk_refresh, slk_noutrefresh,
slk_label, slk_clear, slk_restore, slk_touch, slk_attron,
slk_attrset, slk_attroff, slk_attr_on, slk_attr_set,
slk_attr_off, slk_attr, slk_color - curses soft label rou-
int slk_init(int fmt);
int slk_set(int labnum, const char *label, int fmt);
char *slk_label(int labnum);
int slk_attron(const chtype attrs);
int slk_attroff(const chtype attrs);
int slk_attrset(const chtype attrs);
int slk_attr_on(attr_t attrs, void* opts);
int slk_attr_off(const attr_t attrs, void * opts);
int slk_attr_set(const attr_t attrs,
short color_pair_number, void* opts);
int slk_color(short color_pair_number);
The slk* functions manipulate the set of soft function-key
labels that exist on many terminals. For those terminals
that do not have soft labels, curses takes over the bottom
line of stdscr, reducing the size of stdscr and the vari-
able LINES. curses standardizes on eight labels of up to
eight characters each. In addition to this, the ncurses
implementation supports a mode where it simulates 12
labels of up to five characters each. This is most common
for todays PC like enduser devices. Please note that
ncurses simulates this mode by taking over up to two lines
at the bottom of the screen, it doesn't try to use any
hardware support for this mode.
The slk_init routine must be called before initscr or
newterm is called. If initscr eventually uses a line from
stdscr to emulate the soft labels, then fmt determines how
the labels are arranged on the screen. Setting fmt to 0
indicates a 3-2-3 arrangement of the labels, 1 indicates a
4-4 arrangement and 2 indicates the PC like 4-4-4 mode. If
fmt is set to 3, it is again the PC like 4-4-4 mode, but
in addition an index line is generated, helping the user
to identify the key numbers easily.
The slk_set routine requires labnum to be a label number,
from 1 to 8 (resp. 12); label must be the string to be put
on the label, up to eight (resp. five) characters in
length. A null string or a null pointer sets up a blank
label. fmt is either 0, 1, or 2, indicating whether the
label is to be left-justified, centered, or right-justi-
fied, respectively, within the label.
The slk_refresh and slk_noutrefresh routines correspond to
the wrefresh and wnoutrefresh routines.
The slk_label routine returns the current label for label
number labnum, with leading and trailing blanks stripped.
The slk_clear routine clears the soft labels from the
The slk_restore routine, restores the soft labels to the
screen after a slk_clear has been performed.
The slk_touch routine forces all the soft labels to be
output the next time a slk_noutrefresh is performed.
The slk_attron, slk_attrset, slk_attroff and slk_attr rou-
tines correspond to attron, attrset, attroff and attr_get.
They have an effect only if soft labels are simulated on
the bottom line of the screen. The default highlight for
soft keys is A_STANDOUT (as in System V curses, which does
not document this fact).
The slk_color routine corresponds to color_set. It has an
effect only if soft labels are simulated on the bottom
line of the screen.
These routines return ERR upon failure and OK (SVr4 speci-
fies only "an integer value other than ERR") upon success-
ful completion. slk_attr returns the attribute used for
the soft keys.
slk_label returns NULL on error.
Most applications would use slk_noutrefresh because a wre-
fresh is likely to follow soon.
The XSI Curses standard, Issue 4, describes these func-
tions. It changes the argument type of the attribute-
manipulation functions slk_attron, slk_attroff,
slk_attrset to be attr_t, and adds const qualifiers. The
format codes 2 and 3 for slk_init() and the function
slk_attr are specific to ncurses.
curses(3x), curs_attr(3x), curs_initscr(3x),
Man(1) output converted with