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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(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);
DESCRIPTION
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 charac-
ters.
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 does not define a terminal-specific replacement for it. 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 spec-
ify only "an integer value other than ERR") upon successful completion, unless otherwise
noted in the preceding routine descriptions.
Functions with a "mv" prefix first perform a cursor movement using wmove, and return an
error if the position is outside the window, or if the window pointer is null.
NOTES
Note that addch, mvaddch, mvwaddch, and echochar may be macros.
PORTABILITY
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.
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_STER-
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.
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.
SEE ALSO
curses(3X), curs_attr(3X), curs_clear(3X), curs_inch(3X), curs_outopts(3X),
curs_refresh(3X), curs_variables(3X), putc(3).
Comparable functions in the wide-character (ncursesw) library are described in
curs_add_wch(3X).
curs_addch(3X)
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