curs_addch(3X)                                     curs_addch(3X)

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

SYNOPSIS
       #include <curses.h>

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

DESCRIPTION
       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.

       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
       equivalents.

   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   doesn't   define  a  terminal-specific
       replacement for it (but see the EXTENSIONS section below).
       The names are taken from VT100 nomenclature.

       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

RETURN VALUE
       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.

NOTES
       Note that addch, mvaddch, mvwaddch, and  echochar  may  be
       macros.

PORTABILITY
       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.

       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
       ncurses(3X).

SEE ALSO
       curses(3X), curs_attr(3X), curs_clear(3X),  curs_inch(3X),
       curs_outopts(3X), curs_refresh(3X), putc(3S).

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