Provided by: ncurses-doc_5.9+20140118-1ubuntu1_all bug

NAME

       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

SYNOPSIS

       #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)

DESCRIPTION

       These routines manipulate the current attributes of the named window.  The current attributes 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 character 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 routine standout is the same as attron(A_STANDOUT).
       The routine standend is the  same  as  attrset(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 bkgd(3NCURSES) for functions which modify the attributes used for erasing and clearing.

       The routine color_set sets the current color of the given window to the foreground/background 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 generalizes 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 color(3NCURSES)).  The opts argument is not presently used, but is reserved
       for the future (leave it NULL).

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

              Name            Description
              ────────────────────────────────────────────────────────────
              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_ITALIC        Italics (non-X/Open extension)
              A_CHARTEXT      Bit-mask to extract a character
              COLOR_PAIR(n)   Color-pair number n

       These  video attributes are supported by attr_on and related functions (which also support the attributes
       recognized by attron, etc.):

              Name            Description
              ─────────────────────────────────────────
              WA_HORIZONTAL   Horizontal highlight
              WA_LEFT         Left highlight
              WA_LOW          Low highlight
              WA_RIGHT        Right highlight
              WA_TOP          Top highlight
              WA_VERTICAL     Vertical highlight

       For consistency

       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.

NOTES

       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.

PORTABILITY

       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 functions taking  attr_t  arguments
       are not supported under SVr4.

       The  XSI  Curses  standard  states  that  whether  the  traditional  functions attron/attroff/attrset 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_PROTECT, and A_INVIS).

       This implementation provides the A_ITALIC attribute  for  terminals  which  have  the  enter_italics_mode
       (sitm)  and  exit_italics_mode  (ritm) capabilities.  Italics are not mentioned in X/Open Curses.  Unlike
       the  other  video  attributes,  I_ITALIC  is  unrelated  to  the   set_attributes   capabilities.    This
       implementation makes the assumption that exit_attribute_mode may also reset italics.

       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  highlight  macros  prefixed  with
       WA_.  The older macros have direct counterparts in the newer set of names:

              Name            Description
              ────────────────────────────────────────────────────────────
              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

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

       The XSI curses standard specifies that each pair of corresponding A_ and WA_-using functions 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).  As of August 2013, no known terminal provides
       these highlights (i.e., via the sgr1 capability).

RETURN VALUE

       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 function 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 curses.

       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.

SEE ALSO

       ncurses(3NCURSES),     addch(3NCURSES),     addstr(3NCURSES),      bkgd(3NCURSES),      printw(3NCURSES),
       curses_variables(3NCURSES)

                                                                                                  attr(3NCURSES)