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CentOS 7.0 - man page for pair_number (centos section 3X)

curs_attr(3X)									    curs_attr(3X)

       attroff, wattroff, attron, wattron, attrset, wattrset, color_set, wcolor_set, standend,
       wstandend, standout, wstandout, attr_get, wattr_get, attr_off, wattr_off, attr_on,
       wattr_on, attr_set, wattr_set, chgat, wchgat, mvchgat, mvwchgat, PAIR_NUMBER - curses
       character and window attribute control routines

       #include <curses.h>
       int attroff(int attrs);
       int wattroff(WINDOW *win, int attrs);
       int attron(int attrs);
       int wattron(WINDOW *win, int attrs);
       int attrset(int attrs);
       int wattrset(WINDOW *win, int attrs);
       int color_set(short color_pair_number, void* opts);
       int wcolor_set(WINDOW *win, short color_pair_number,
	     void* opts);
       int standend(void);
       int wstandend(WINDOW *win);
       int standout(void);
       int wstandout(WINDOW *win);
       int attr_get(attr_t *attrs, short *pair, void *opts);
       int wattr_get(WINDOW *win, attr_t *attrs, short *pair,
	      void *opts);
       int attr_off(attr_t attrs, void *opts);
       int wattr_off(WINDOW *win, attr_t attrs, void *opts);
       int attr_on(attr_t attrs, void *opts);
       int wattr_on(WINDOW *win, attr_t attrs, void *opts);
       int attr_set(attr_t attrs, short pair, void *opts);
       int wattr_set(WINDOW *win, attr_t attrs, short pair, void *opts);
       int chgat(int n, attr_t attr, short color,
	     const void *opts)
       int wchgat(WINDOW *win, int n, attr_t attr,
	     short color, const void *opts)
       int mvchgat(int y, int x, int n, attr_t attr,
	     short color, const void *opts)
       int mvwchgat(WINDOW *win, int y, int x, int n,
	     attr_t attr, short color, const void *opts)

       These routines manipulate the current attributes of the named  window.	The  current  at-
       tributes of a window apply to all characters that are written into the window with waddch,
       waddstr and wprintw.  Attributes are a property of the character, and move with the  char-
       acter  through  any  scrolling and insert/delete line/character operations.  To the extent
       possible, they are displayed as appropriate modifications  to  the  graphic  rendition  of
       characters put on the screen.

       The routine attrset sets the current attributes of the given window to attrs.  The routine
       attroff turns off the named attributes without turning any other  attributes  on  or  off.
       The  routine  attron turns on the named attributes without affecting any others.  The rou-
       tine standout is the same as attron(A_STANDOUT).  The routine standend is the same as  at-
       trset(A_NORMAL) or attrset(0), that is, it turns off all attributes.

       The  attrset  and related routines do not affect the attributes used when erasing portions
       of the window.  See curs_bkgd(3X) for functions which modify the attributes used for eras-
       ing and clearing.

       The  routine  color_set sets the current color of the given window to the foreground/back-
       ground combination described by the color_pair_number. The parameter opts is reserved  for
       future use, applications must supply a null pointer.

       The  routine  wattr_get returns the current attribute and color pair for the given window;
       attr_get returns the current attribute and color pair for stdscr.   The	remaining  attr_*
       functions  operate  exactly  like the corresponding attr* functions, except that they take
       arguments of type attr_t rather than int.

       The routine chgat changes the attributes of a given number of characters starting  at  the
       current	cursor	location  of  stdscr.  It does not update the cursor and does not perform
       wrapping.  A character count of -1 or greater than the remaining  window  width	means  to
       change  attributes all the way to the end of the current line.  The wchgat function gener-
       alizes this to any window; the mvwchgat function does a cursor  move  before  acting.   In
       these  functions,  the  color  argument is a color-pair index (as in the first argument of
       init_pair, see curs_color(3X)).	The opts argument is not presently used, but is  reserved
       for the future (leave it NULL).

       The  following  video attributes, defined in <curses.h>, can be passed to the routines at-
       tron, attroff, and attrset, or OR'd with the characters passed to addch.

			A_NORMAL	Normal display (no highlight)
			A_STANDOUT	Best highlighting mode of the terminal.
			A_UNDERLINE	Underlining
			A_REVERSE	Reverse video
			A_BLINK 	Blinking
			A_DIM		Half bright
			A_BOLD		Extra bright or bold
			A_PROTECT	Protected mode
			A_INVIS 	Invisible or blank mode
			A_ALTCHARSET	Alternate character set
			A_CHARTEXT	Bit-mask to extract a character
			COLOR_PAIR(n)	Color-pair number n

       The following macro is the reverse of COLOR_PAIR(n):

       PAIR_NUMBER(attrs) Returns the pair number associated
			  with the COLOR_PAIR(n) attribute.

       The return values of many of these routines are not meaningful (they  are  implemented  as
       macro-expanded assignments and simply return their argument).  The SVr4 manual page claims
       (falsely) that these routines always return 1.

       Note that attroff, wattroff, attron, wattron, attrset, wattrset, standend and standout may
       be macros.

       COLOR_PAIR  values  can	only be OR'd with attributes if the pair number is less than 256.
       The alternate functions such as color_set can pass a color pair value directly.	 However,
       ncurses	ABI  4	and  5 simply OR this value within the alternate functions.  You must use
       ncurses ABI 6 to support more than 256 color pairs.

       These functions are supported in the XSI Curses standard, Issue 4.  The	standard  defined
       the  dedicated type for highlights, attr_t, which is not defined in SVr4 curses. The func-
       tions taking attr_t arguments are not supported under SVr4.

       The XSI Curses standard states that whether the traditional  functions  attron/attroff/at-
       trset  can manipulate attributes other than A_BLINK, A_BOLD, A_DIM, A_REVERSE, A_STANDOUT,
       or A_UNDERLINE is "unspecified".  Under this implementation as well as SVr4 curses,  these
       functions  correctly  manipulate  all other highlights (specifically, A_ALTCHARSET, A_PRO-
       TECT, and A_INVIS).

       XSI Curses added the new entry points, attr_get, attr_on,  attr_off,  attr_set,	wattr_on,
       wattr_off,  wattr_get,  wattr_set.   These are intended to work with a new series of high-
       light macros prefixed with WA_.

       Older versions of this library did not force an update of the screen when changing the at-
       tributes.  Use touchwin to force the screen to match the updated attributes.

			WA_NORMAL	Normal display (no highlight)
			WA_STANDOUT	Best highlighting mode of the terminal.
			WA_UNDERLINE	Underlining
			WA_REVERSE	Reverse video
			WA_BLINK	Blinking
			WA_DIM		Half bright
			WA_BOLD 	Extra bright or bold
			WA_ALTCHARSET	Alternate character set

       The  XSI  curses standard specifies that each pair of corresponding A_ and WA_-using func-
       tions operates on the same current-highlight information.

       The XSI standard extended conformance level  adds  new  highlights  A_HORIZONTAL,  A_LEFT,
       A_LOW,  A_RIGHT,  A_TOP, A_VERTICAL (and corresponding WA_ macros for each) which this im-
       plementation does not yet support.

       All routines return the integer OK on success, or ERR on failure.

       X/Open does not define any error conditions.

       This implementation returns an error if the window pointer is null.  The wcolor_set  func-
       tion  returns  an error if the color pair parameter is outside the range 0..COLOR_PAIRS-1.
       This implementation also provides getattrs for compatibility with older versions of  curs-

       Functions  with	a  "mv" prefix first perform a cursor movement using wmove, and return an
       error if the position is outside the window, or if the window pointer is null.

       curses(3X), curs_addch(3X), curs_addstr(3X),  curs_bkgd(3X),  curs_printw(3X),  curs_vari-


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