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- * Copyright (c) 2017 Free Software Foundation, Inc. *
+ * Copyright 2018-2023,2024 Thomas E. Dickey *
+ * Copyright 2017 Free Software Foundation, Inc. *
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* Permission is hereby granted, free of charge, to any person obtaining a *
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* Author: Thomas E. Dickey
- * @Id: new_pair.3x,v 1.9 2017/03/13 21:21:34 tom Exp @
+ * @Id: new_pair.3x,v 1.46 2024/03/16 15:35:01 tom Exp @
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-<H1 class="no-header">new_pair 3x</H1>
+<H1 class="no-header">new_pair 3x 2024-03-16 ncurses 6.5 Library calls</H1>
<PRE>
-<STRONG><A HREF="new_pair.3x.html">new_pair(3x)</A></STRONG>
<STRONG><A HREF="new_pair.3x.html">new_pair(3x)</A></STRONG>
+<STRONG><A HREF="new_pair.3x.html">new_pair(3x)</A></STRONG>
Library calls <STRONG><A HREF="new_pair.3x.html">new_pair(3x)</A></STRONG>
</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
- <STRONG>alloc_pair</STRONG>, <STRONG>find_pair</STRONG>, <STRONG>free_pair</STRONG> - new curses color-pair
- functions
+ <STRONG>alloc_pair</STRONG>, <STRONG>find_pair</STRONG>, <STRONG>free_pair</STRONG> - dynamically allocate <EM>curses</EM> color
+ pairs
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
- <STRONG>int</STRONG> <STRONG>alloc_pair(int</STRONG> <STRONG>fg,</STRONG> <STRONG>int</STRONG> <STRONG>bg);</STRONG>
- <STRONG>int</STRONG> <STRONG>find_pair(int</STRONG> <STRONG>fg,</STRONG> <STRONG>int</STRONG> <STRONG>bg);</STRONG>
- <STRONG>int</STRONG> <STRONG>free_pair(int</STRONG> <STRONG>pair);</STRONG>
+ <STRONG>int</STRONG> <STRONG>alloc_pair(int</STRONG> <EM>fg</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>bg</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>find_pair(int</STRONG> <EM>fg</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>bg</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>free_pair(int</STRONG> <EM>pair</EM><STRONG>);</STRONG>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
- These functions are an extension to the curses library.
- They permit an application to dynamically allocate a color
- pair using the foreground/background colors rather than
- assign a fixed color pair number, and return an unused
- pair to the pool.
-
- The number of colors may be related to the number of pos-
- sible color pairs for a given terminal, or it may not:
-
- <STRONG>o</STRONG> While almost all terminals allow setting the color
- <EM>attributes</EM> independently, it is unlikely that your
- terminal allows you to modify the attributes of a
- given character cell without rewriting it. That is,
- the foreground and background colors are applied as a
+ These functions are an extension to the <EM>curses</EM> library. They permit an
+ application to dynamically allocate a color pair using the
+ foreground/background colors rather than assign a fixed color pair
+ number, and return an unused pair to the pool.
+
+ The number of colors may be related to the number of possible color
+ pairs for a given terminal, or it may not:
+
+ <STRONG>o</STRONG> While almost all terminals allow setting the color <EM>attributes</EM>
+ independently, it is unlikely that your terminal allows you to
+ modify the attributes of a given character cell without rewriting
+ it. That is, the foreground and background colors are applied as a
pair.
- <STRONG>o</STRONG> Color pairs are the curses library's way of managing a
- color palette on a terminal. If the library does not
- keep track of the <EM>combinations</EM> of colors which are
- displayed, it will be inefficient.
+ <STRONG>o</STRONG> Color pairs are the <EM>curses</EM> library's way of managing a color
+ palette on a terminal. If the library does not keep track of the
+ <EM>combinations</EM> of colors which are displayed, it will be inefficient.
- <STRONG>o</STRONG> For simple terminal emulators with only a few dozen
- color combinations, it is convenient to use the maxi-
- mum number of combinations as the limit on color
- pairs:
+ <STRONG>o</STRONG> For simple terminal emulators with only a few dozen color
+ combinations, it is convenient to use the maximum number of
+ combinations as the limit on color pairs:
- <STRONG>COLORS</STRONG> <EM>*</EM> <STRONG>COLORS</STRONG>
+ <STRONG>COLORS</STRONG> <EM>*</EM> <STRONG>COLORS</STRONG>
- <STRONG>o</STRONG> Terminals which support <EM>default</EM> <EM>colors</EM> distinct from
- "ANSI colors" add to the possible combinations, pro-
- ducing this total:
+ <STRONG>o</STRONG> Terminals which support <EM>default</EM> <EM>colors</EM> distinct from "ANSI colors"
+ add to the possible combinations, producing this total:
- <EM>(</EM> <STRONG>COLORS</STRONG> <EM>+</EM> <EM>1</EM> <EM>)</EM> <EM>*</EM> <EM>(</EM> <STRONG>COLORS</STRONG> <EM>+</EM> <EM>1</EM> <EM>)</EM>
+ <EM>(</EM> <STRONG>COLORS</STRONG> <EM>+</EM> <EM>1</EM> <EM>)</EM> <EM>*</EM> <EM>(</EM> <STRONG>COLORS</STRONG> <EM>+</EM> <EM>1</EM> <EM>)</EM>
- <STRONG>o</STRONG> An application might use up to a few dozen color pairs
- to implement a predefined color scheme.
+ <STRONG>o</STRONG> An application might use up to a few dozen color pairs to implement
+ a predefined color scheme.
- Beyond that lies in the realm of programs using the
- foreground and background colors for "ASCII art" (or
- some other non-textual application).
+ Beyond that lies in the realm of programs using the foreground and
+ background colors for "ASCII art" (or some other non-textual
+ application).
- Also beyond those few dozen pairs, the required size
- for a table to represent the combinations grows
- rapidly with an increasing number of colors.
+ Also beyond those few dozen pairs, the required size for a table to
+ represent the combinations grows rapidly with an increasing number
+ of colors.
- These functions allow a developer to let the screen
- library manage color pairs.
+ These functions allow a developer to let the screen library manage
+ color pairs.
</PRE><H3><a name="h3-alloc_pair">alloc_pair</a></H3><PRE>
- The <STRONG>alloc_pair</STRONG> function accepts parameters for foreground
- and background color, and checks if that color combination
- is already associated with a color pair.
+ The <STRONG>alloc_pair</STRONG> function accepts parameters for foreground and
+ background color, and checks if that color combination is already
+ associated with a color pair.
- <STRONG>o</STRONG> If the combination already exists, <STRONG>alloc_pair</STRONG> returns
- the existing pair.
+ <STRONG>o</STRONG> If the combination already exists, <STRONG>alloc_pair</STRONG> returns the existing
+ pair.
- <STRONG>o</STRONG> If the combination does not exist, <STRONG>alloc_pair</STRONG> allo-
- cates a new color pair and returns that.
+ <STRONG>o</STRONG> If the combination does not exist, <STRONG>alloc_pair</STRONG> allocates a new color
+ pair and returns that.
- <STRONG>o</STRONG> If the table fills up, <STRONG>alloc_pair</STRONG> discards the least-
- recently allocated entry using <STRONG>free_pair</STRONG> and allocates
- a new color pair.
+ <STRONG>o</STRONG> If the table fills up, <STRONG>alloc_pair</STRONG> discards the least-recently
+ allocated entry using <STRONG>free_pair</STRONG> and allocates a new color pair.
- All of the color pairs are allocated from a table of pos-
- sible color pairs. The size of the table is determined by
- the terminfo <EM>pairs</EM> capability. The table is shared with
- <STRONG>init_pair</STRONG>; in fact <STRONG>alloc_pair</STRONG> calls <STRONG>init_pair</STRONG> after updat-
- ing the ncurses library's fast index to the colors versus
- color pairs.
+ All of the color pairs are allocated from a table of possible color
+ pairs. The size of the table is determined by the terminfo <STRONG>pairs</STRONG>
+ capability. The table is shared with <STRONG>init_pair</STRONG>; in fact <STRONG>alloc_pair</STRONG>
+ calls <STRONG>init_pair</STRONG> after updating the <EM>ncurses</EM> library's fast index to the
+ colors versus color pairs.
</PRE><H3><a name="h3-find_pair">find_pair</a></H3><PRE>
- The <STRONG>find_pair</STRONG> function accepts parameters for foreground
- and background color, and checks if that color combination
- is already associated with a color pair, returning the
- pair number if it has been allocated. Otherwise it
- returns -1.
+ The <STRONG>find_pair</STRONG> function accepts parameters for foreground and background
+ color, and checks if that color combination is already associated with
+ a color pair, returning the pair number if it has been allocated.
+ Otherwise it returns -1.
</PRE><H3><a name="h3-free_pair">free_pair</a></H3><PRE>
- Marks the given color pair as unused, i.e., like color
- pair 0.
+ Marks the given color pair as unused, i.e., like color pair 0.
</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
- The <STRONG>alloc_pair</STRONG> function returns a color pair number in the
- range 1 through <STRONG>COLOR_PAIRS</STRONG>-1, unless it encounters an
- error updating its fast index to the color pair values,
- preventing it from allocating a color pair. In that case,
- it returns -1.
+ The <STRONG>alloc_pair</STRONG> function returns a color pair number in the range 1
+ through <STRONG>COLOR_PAIRS</STRONG>-1, unless it encounters an error updating its fast
+ index to the color pair values, preventing it from allocating a color
+ pair. In that case, it returns -1.
- The <STRONG>find_pair</STRONG> function returns a color pair number if the
- given color combination has been associated with a color
- pair, or -1 if not.
+ The <STRONG>find_pair</STRONG> function returns a color pair number if the given color
+ combination has been associated with a color pair, or -1 if not.
- Likewise, <STRONG>free_pair</STRONG> returns <STRONG>OK</STRONG> unless it encounters an
- error updating the fast index or if no such color pair is
- in use.
+ Likewise, <STRONG>free_pair</STRONG> returns <STRONG>OK</STRONG> unless it encounters an error updating
+ the fast index or if no such color pair is in use.
</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
- These routines are specific to ncurses. They were not
- supported on Version 7, BSD or System V implementations.
- It is recommended that any code depending on them be con-
- ditioned using NCURSES_VERSION.
+ These routines are specific to <EM>ncurses</EM>. They were not supported on
+ Version 7, BSD or System V implementations. It is recommended that any
+ code depending on them be conditioned using <STRONG>NCURSES_VERSION</STRONG>.
-</PRE><H2><a name="h2-
SEE-ALSO">SEE ALSO</a></H2><PRE>
- <STRONG><A HREF="init_pair.3x.html">init_pair(3x)</A></STRONG>.
+</PRE><H2><a name="h2-
AUTHORS">AUTHORS</a></H2><PRE>
+ Thomas Dickey
-</PRE><H2><a name="h2-
AUTHOR">AUTHOR</a></H2><PRE>
- Thomas Dickey.
+</PRE><H2><a name="h2-
SEE-ALSO">SEE ALSO</a></H2><PRE>
+ <STRONG><A HREF="curs_color.3x.html">curs_color(3x)</A></STRONG>
-
<STRONG><A HREF="new_pair.3x.html">new_pair(3x)</A></STRONG>
+
ncurses 6.5 2024-03-16 <STRONG><A HREF="new_pair.3x.html">new_pair(3x)</A></STRONG>
</PRE>
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</li>
<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
+<li><a href="#h2-AUTHORS">AUTHORS</a></li>
<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
-<li><a href="#h2-AUTHOR">AUTHOR</a></li>
</ul>
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