curs_addch 3x

curs_addch(3x)                                           curs_addch(3x)


       addch,  waddch,  mvaddch,  mvwaddch, echochar, wechochar -
       add a character (with attributes) to a curses window, then
       advance the cursor


       #include <curses.h>

       int addch(const chtype ch);
       int waddch(WINDOW *win, const chtype ch);
       int mvaddch(int y, int x, const chtype ch);
       int mvwaddch(WINDOW *win, int y, int x, const chtype ch);
       int echochar(const chtype ch);
       int wechochar(WINDOW *win, const chtype ch);


       The  addch,  waddch, mvaddch and mvwaddch routines put the
       character ch into the given window at its  current  window
       position,  which  is then advanced.  They are analogous to
       putchar in stdio(3).  If the advance is at the right  mar-
       gin,  the  cursor  automatically wraps to the beginning of
       the next line.  At the bottom  of  the  current  scrolling
       region,  if  scrollok  is enabled, the scrolling region is
       scrolled up one line.

       If ch is a tab, newline, or backspace, the cursor is moved
       appropriately within the window.  Backspace moves the cur-
       sor one character left; at the left edge of  a  window  it
       does  nothing.   Newline  does  a clrtoeol, then moves the
       cursor to  the  window  left  margin  on  the  next  line,
       scrolling  the  window if on the last line.  Tabs are con-
       sidered to be at every eighth column.   The  tab  interval
       may be altered by setting the TABSIZE variable.

       If ch is any control character other than tab, newline, or
       backspace, it is drawn  in  ^X  notation.   Calling  winch
       after adding a control character does not return the char-
       acter itself, but instead returns the ^-representation  of
       the control character.

       Video attributes can be combined with a character argument
       passed to addch or related functions by logical-ORing them
       into  the  character.   (Thus, text, including attributes,
       can be copied from one place to  another  using  inch  and
       addch.)   See  the curs_attr(3x) page for values of prede-
       fined video attribute constants that can be usefully OR'ed
       into characters.

       The  echochar  and  wechochar routines are equivalent to a
       call to addch followed by a call to refresh, or a call  to
       waddch followed by a call to wrefresh.  The knowledge that
       only a single character is being output is used  and,  for
       non-control  characters,  a  considerable performance gain
       may be seen by  using  these  routines  instead  of  their

   Line Graphics
       The  following  variables  may be used to add line drawing
       characters to the screen with routines of the  addch  fam-
       ily.   The  default  character listed below is used if the
       acsc  capability  does  not  define  a   terminal-specific
       replacement for it.  The names are taken from VT100 nomen-

       Name           Default   Description
       ACS_BLOCK      #         solid square block
       ACS_BOARD      #         board of squares
       ACS_BTEE       +         bottom tee
       ACS_BULLET     o         bullet
       ACS_CKBOARD    :         checker board (stipple)
       ACS_DARROW     v         arrow pointing down
       ACS_DEGREE     '         degree symbol
       ACS_DIAMOND    +         diamond
       ACS_GEQUAL     >         greater-than-or-equal-to
       ACS_HLINE      -         horizontal line
       ACS_LANTERN    #         lantern symbol
       ACS_LARROW     <         arrow pointing left
       ACS_LEQUAL     <         less-than-or-equal-to
       ACS_LLCORNER   +         lower left-hand corner
       ACS_LRCORNER   +         lower right-hand corner
       ACS_LTEE       +         left tee
       ACS_NEQUAL     !         not-equal
       ACS_PI         *         greek pi
       ACS_PLMINUS    #         plus/minus
       ACS_PLUS       +         plus
       ACS_RARROW     >         arrow pointing right
       ACS_RTEE       +         right tee
       ACS_S1         -         scan line 1
       ACS_S3         -         scan line 3
       ACS_S7         -         scan line 7
       ACS_S9         _         scan line 9
       ACS_STERLING   f         pound-sterling symbol
       ACS_TTEE       +         top tee
       ACS_UARROW     ^         arrow pointing up
       ACS_ULCORNER   +         upper left-hand corner
       ACS_URCORNER   +         upper right-hand corner
       ACS_VLINE      |         vertical line


       All routines return the integer ERR upon failure and OK on
       success  (the  SVr4 manuals specify only "an integer value
       other than ERR") upon successful completion, unless other-
       wise noted in the preceding routine descriptions.

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


       Note  that  addch,  mvaddch, mvwaddch, and echochar may be


       All these functions are described in the XSI Curses  stan-
       dard,  Issue  4.  The defaults specified for forms-drawing
       characters apply in the POSIX locale.

       X/Open Curses states that the ACS_  definitions  are  char
       constants.   For  the  wide-character  implementation (see
       curs_add_wch), there are analogous WACS_ definitions which
       are cchar_t constants.

       Some  ACS symbols (ACS_S3, ACS_S7, ACS_LEQUAL, ACS_GEQUAL,
       ACS_PI, ACS_NEQUAL, ACS_STERLING) were not  documented  in
       any  publicly  released  System V.  However, many publicly
       available terminfos include acsc strings  in  which  their
       key  characters  (pryz{|}) are embedded, and a second-hand
       list of their character descriptions has  come  to  light.
       The   ACS-prefixed   names  for  them  were  invented  for

       The TABSIZE variable is implemented in  some  versions  of
       curses, but is not part of X/Open curses.

       If  ch  is  a  carriage return, the cursor is moved to the
       beginning of the current row of the window.  This is  true
       of other implementations, but is not documented.


       curses(3x),  curs_attr(3x), curs_clear(3x), curs_inch(3x),
       curs_outopts(3x),  curs_refresh(3x),   curs_variables(3x),

       Comparable  functions  in  the  wide-character  (ncursesw)
       library are described in curs_add_wch(3x).


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