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   attr_get.3x    ( 3 )

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Портативность (Portability)

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

       Very old 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 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).

       XSI Curses added these entry points:

              attr_get, attr_on, attr_off, attr_set, wattr_on,
              wattr_off, wattr_get, wattr_set

       The new functions 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

       XSI curses does not assign values to these symbols, nor does it
       state whether or not they are related to the similarly-named
       A_NORMAL, etc.:

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

       •   However, in some implementations, those symbols have
           unrelated values.

           For example, the Solaris xpg4 (X/Open) curses declares attr_t
           to be an unsigned short integer (16-bits), while chtype is a
           unsigned integer (32-bits).  The WA_ symbols in this case are
           different from the A_ symbols because they are used for a
           smaller datatype which does not represent A_CHARTEXT or
           A_COLOR.

           In this implementation (as in many others), the values happen
           to be the same because it simplifies copying information
           between chtype and cchar_t variables.

       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).