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.

January 12, 2017 | NetBSD 8.2