curs_attr.3x.html

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       The routine <STRONG>chgat</STRONG> changes the attributes of a given number
       of characters starting at the current cursor  location  of
       <STRONG>stdscr</STRONG>.   It  does not update the cursor and does not per-
       form 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 <STRONG>wchgat</STRONG>  func-
       tion generalizes this to any window; the <STRONG>mvwchgat</STRONG> function
       does a cursor move before acting.  In these functions, the
       color  argument is a color-pair index (as in the first ar-
       gument of <EM>init</EM><STRONG>_</STRONG><EM>pair</EM>, see <STRONG><A HREF="curs_color.3x.html">curs_color(3x)</A></STRONG>).  The <STRONG>opts</STRONG>  argu-
       ment is not presently used, but is reserved for the future
       (leave it <STRONG>NULL</STRONG>).  Note that changing the  attributes  does
       not imply that a subsequent <STRONG>refresh</STRONG> will update the screen
       to match, since the character  values  are  not  modified.
       Use  <STRONG>touchwin</STRONG> to force the screen to match the updated at-
       tributes.

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


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

       The following macro is the reverse of <STRONG>COLOR_PAIR(</STRONG><EM>n</EM><STRONG>)</STRONG>:

       <STRONG>PAIR_NUMBER(</STRONG><EM>attrs</EM>) Returns the pair number associated
                          with the <STRONG>COLOR_PAIR(</STRONG><EM>n</EM><STRONG>)</STRONG> attribute.

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


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<H2>NOTES</H2><PRE>
       Note  that  <STRONG>attroff</STRONG>,  <STRONG>wattroff</STRONG>,  <STRONG>attron</STRONG>, <STRONG>wattron</STRONG>, <STRONG>attrset</STRONG>,
       <STRONG>wattrset</STRONG>, <STRONG>standend</STRONG> and <STRONG>standout</STRONG> may be macros.

       <STRONG>COLOR_PAIR</STRONG> values can only be OR'd with attributes if  the
       pair  number  is  less  than 256.  The alternate functions
       such as <STRONG>color_set</STRONG> 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.


</PRE>
<H2>PORTABILITY</H2><PRE>
       These  functions are supported in the XSI Curses standard,
       Issue 4.  The standard  defined  the  dedicated  type  for
       highlights,  <STRONG>attr_t</STRONG>,  which is not defined in SVr4 curses.
       The functions taking <STRONG>attr_t</STRONG> arguments  are  not  supported
       under SVr4.

       The XSI Curses standard states that whether the tradition-
       al functions  <STRONG>attron</STRONG>/<STRONG>attroff</STRONG>/<STRONG>attrset</STRONG>  can  manipulate  at-
       tributes  other  than  <STRONG>A_BLINK</STRONG>,  <STRONG>A_BOLD</STRONG>, <STRONG>A_DIM</STRONG>, <STRONG>A_REVERSE</STRONG>,
       <STRONG>A_STANDOUT</STRONG>, or <STRONG>A_UNDERLINE</STRONG> is "unspecified".   Under  this
       implementation  as  well  as  SVr4 curses, these functions
       correctly manipulate all other  highlights  (specifically,
       <STRONG>A_ALTCHARSET</STRONG>, <STRONG>A_PROTECT</STRONG>, and <STRONG>A_INVIS</STRONG>).

       XSI  Curses added the new entry points, <STRONG>attr_get</STRONG>, <STRONG>attr_on</STRONG>,
       <STRONG>attr_off</STRONG>, <STRONG>attr_set</STRONG>, <STRONG>wattr_on</STRONG>, <STRONG>wattr_off</STRONG>,  <STRONG>wattr_get</STRONG>,  <STRONG>wat-</STRONG>
       <STRONG>tr_set</STRONG>.   These  are intended to work with a new series of
       highlight macros prefixed with <STRONG>WA_</STRONG>.


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

       The XSI curses standard specifies that each pair of corre-
       sponding  <STRONG>A_</STRONG>  and <STRONG>WA_</STRONG>-using functions operates on the same
       current-highlight information.

       The XSI standard extended conformance level adds new high-
       lights <STRONG>A_HORIZONTAL</STRONG>, <STRONG>A_LEFT</STRONG>, <STRONG>A_LOW</STRONG>, <STRONG>A_RIGHT</STRONG>, <STRONG>A_TOP</STRONG>, <STRONG>A_VER-</STRONG>
       <STRONG>TICAL</STRONG> (and corresponding <STRONG>WA_</STRONG> macros for each)  which  this
       implementation does not yet support.


</PRE>
<H2>RETURN VALUE</H2><PRE>
       All  routines  return the integer <STRONG>OK</STRONG> on success, or <STRONG>ERR</STRONG> on
       failure.

       X/Open does not define any error conditions.

       This implementation returns an error if the window pointer
       is  null.  The <STRONG>wcolor_set</STRONG> function returns an error if the
       color  pair  parameter  is  outside  the   range   0..COL-
       OR_PAIRS-1.


</PRE>
<H2>SEE ALSO</H2><PRE>
       <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>,        <STRONG><A HREF="curs_addch.3x.html">curs_addch(3x)</A></STRONG>,        <STRONG><A HREF="curs_addstr.3x.html">curs_addstr(3x)</A></STRONG>,
       <STRONG><A HREF="curs_bkgd.3x.html">curs_bkgd(3x)</A></STRONG>, <STRONG><A HREF="curs_printw.3x.html">curs_printw(3x)</A></STRONG>



                                                          <STRONG><A HREF="curs_attr.3x.html">curs_attr(3x)</A></STRONG>
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