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RedHat 9 (Linux i386) - man page for addch (redhat section 3X)

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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  win-
       dow 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 appropriately within	the  win-
       dow.   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 character 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 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 rou-
       tines of the addch family.  The default character listed below is used if the  acsc  capa-
       bility  doesn't define a terminal-specific replacement for it (but see the EXTENSIONS sec-
       tion 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

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

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

       All these functions are described in the XSI Curses standard, Issue 4.  The defaults spec-
       ified for forms-drawing characters apply in the POSIX locale.

       LING) 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(3X),    curs_attr(3X),	 curs_clear(3X),     curs_inch(3X),	curs_outopts(3X),
       curs_refresh(3X), putc(3S).

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