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addch, waddch, mvaddch, mvwaddch, echochar, wechochar - add a character



        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 margin, 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 appropri‐
        ately within the window.  Backspace  moves  the  cursor  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 considered 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 char‐
        acter  does  not  return  the character 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 predefined video attribute constants that can be usefully OR’ed into
        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 out‐
        put 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 family.  The default character
        listed below is used if the acsc capability doesn’t define a  terminal-
        specific  replacement for it.  The names are taken from VT100 nomencla‐
        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 suc‐
        cessful completion, unless otherwise noted  in  the  preceding  routine


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


        All  these functions are described in the XSI Curses standard, Issue 4.
        The defaults specified for forms-drawing characters apply in the  POSIX
        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).
        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_out     
        opts(3X), curs_refresh(3X), putc(3S).
        Comparable functions  in  the  wide-character  (ncursesw)  library  are
        described in curs_add_wch(3X).


Based on BSD UNIX
FreeBSD is an advanced operating system for x86 compatible (including Pentium and Athlon), amd64 compatible (including Opteron, Athlon64, and EM64T), UltraSPARC, IA-64, PC-98 and ARM architectures. It is derived from BSD, the version of UNIX developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.