- The use_default_colors and assume_default_colors functions are exten-
- sions to the curses library. They are used with terminals that support
- ISO 6429 color, or equivalent. These terminals allow the application
- to reset color to an unspecified default value (e.g., with SGR 39 or
- SGR 49).
+ The use_default_colors and assume_default_colors functions are
+ extensions to the curses library. They are used with terminals that
+ support ISO 6429 color, or equivalent. These terminals allow the
+ application to reset color to an unspecified default value (e.g., with
+ SGR 39 or SGR 49).
Applications that paint a colored background over the whole screen do
not take advantage of SGR 39 and SGR 49. Some applications are
designed to work with the default background, using colors only for
- text. For example, there are several implementations of the ls program
+ text. For example, there are several implementations of the ls program
which use colors to denote different file types or permissions. These
"color ls" programs do not necessarily modify the background color,
- typically using only the setaf terminfo capability to set the fore-
- ground color. Full-screen applications that use default colors can
+ typically using only the setaf terminfo capability to set the
+ foreground color. Full-screen applications that use default colors can
achieve similar visual effects.
- The first function, use_default_colors tells the curses library to
+ The first function, use_default_colors tells the curses library to
assign terminal default foreground/background colors to color number
- -1. So init_pair(x,COLOR_RED,-1) will initialize pair x as red on
+ -1. So init_pair(x,COLOR_RED,-1) will initialize pair x as red on
default background and init_pair(x,-1,COLOR_BLUE) will initialize pair
x as default foreground on blue.
- The other, assume_default_colors is a refinement which tells which col-
- ors to paint for color pair 0. This function recognizes a special
+ The other, assume_default_colors is a refinement which tells which
+ colors to paint for color pair 0. This function recognizes a special
color number -1, which denotes the default terminal color.
The following are equivalent:
- use_default_colors();
- assume_default_colors(-1,-1);
+ use_default_colors();
+ assume_default_colors(-1,-1);
These are ncurses extensions. For other curses implementations, color
- number -1 does not mean anything, just as for ncurses before a success-
- ful call of use_default_colors or assume_default_colors.
+ number -1 does not mean anything, just as for ncurses before a
+ successful call of use_default_colors or assume_default_colors.
Other curses implementations do not allow an application to modify
color pair 0. They assume that the background is COLOR_BLACK, but do
not ensure that the color pair 0 is painted to match the assumption.
- If your application does not use either use_default_colors or
- assume_default_colors ncurses will paint a white foreground (text) with
+ If your application does not use either use_default_colors or
+ assume_default_colors ncurses will paint a white foreground (text) with
black background for color pair 0.
- These functions return the integer ERR upon failure and OK on success.
- They will fail if either the terminal does not support the orig_pair or
- orig_colors capability. If the initialize_pair capability is not
+ These functions return the integer ERR upon failure and OK on success.
+ They will fail if either the terminal does not support the orig_pair or
+ orig_colors capability. If the initialize_pair capability is not
found, this causes an error as well.
- Associated with this extension, the init_pair function accepts negative
+ Associated with this extension, the init_pair function accepts negative
arguments to specify default foreground or background colors.
- The use_default_colors function was added to support ded. This is a
+ The use_default_colors function was added to support ded. This is a
full-screen application which uses curses to manage only part of the
screen. The bottom portion of the screen, which is of adjustable size,
is left uncolored to display the results from shell commands. The top
@@ -120,16 +121,16 @@
ls" programs. Attempting to manage the background color of the screen
for this application would give unsatisfactory results for a variety of
reasons. This extension was devised after noting that color xterm (and
- similar programs) provides a background color which does not necessar-
- ily correspond to any of the ANSI colors. While a special terminfo
- entry could be constructed using nine colors, there was no mechanism
- provided within curses to account for the related orig_pair and
- back_color_erase capabilities.
+ similar programs) provides a background color which does not
+ necessarily correspond to any of the ANSI colors. While a special
+ terminfo entry could be constructed using nine colors, there was no
+ mechanism provided within curses to account for the related orig_pair
+ and back_color_erase capabilities.
- The assume_default_colors function was added to solve a different prob-
- lem: support for applications which would use environment variables and
- other configuration to bypass curses' notion of the terminal's default
- colors, setting specific values.
+ The assume_default_colors function was added to solve a different
+ problem: support for applications which would use environment variables
+ and other configuration to bypass curses' notion of the terminal's
+ default colors, setting specific values.