curs_addch(3)curs_addch(3)NAME
curs_addch, addch, waddch, mvaddch, mvwaddch, echochar, wechochar - Add
a character (with attributes) to a Curses window and 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 );
LIBRARY
Curses Library (libcurses)
STANDARDS
Interfaces documented on this reference page conform to industry stan‐
dards as follows:
addch, waddch, mvaddch, mvwaddch, echochar, wechochar: XCURSES4.2
Refer to the standards(5) reference page for more information about
industry standards and associated tags.
DESCRIPTION
The addch, waddch, mvaddch, and mvwaddch routines put the character ch
into the window at the current cursor position of the window and
advance the position of the window cursor. Their function is similar to
that of the putchar function. At the right margin, an automatic newline
is performed. At the bottom of the scrolling region, if scrollok is
enabled, the scrolling region is scrolled up one line.
If ch is a tab, newline, or backspace, these functions move the cursor
appropriately within the window. A newline also performs clrtoeol
before moving. Tabs are considered to be at every eighth column.
If ch is another control character, it is drawn in the ^X notation.
Calling winch after adding a control character does not return the con‐
trol character, but instead returns the representation of the control
character.
Video attributes can be combined with a character in a parameter
through an inclusive OR operation. This operation also sets these
attributes. (The intent here is to allow text, including attributes, to
be copied from one place to another by using inch and addch. See the
discussion on standout, predefined video attribute constants, in the
curs_attr(3) reference page.)
The echochar and wechochar routines are functionally equivalent to a
call to addch followed by a call to refresh, or a call to waddch fol‐
lowed by a call to wrefresh. The knowledge that only a single character
is being output is taken into consideration and, for non-control char‐
acters, a considerable performance gain may be realized by using these
routines instead of their equivalents.
Line Graphics
The following variables may be used with routines of the addch family
to add line-drawing characters to the screen. When variables are
defined for the terminal, the A_ALTCHARSET bit is turned on (see
curs_attr(3)). Otherwise, the default character specified in the fol‐
lowing list is stored in the variable. The names chosen for variables
are consistent with the VT100 nomenclature.
─────────────────────────────────────────────────
Name Default Glyph Description
─────────────────────────────────────────────────
ACS_ULCORNER + upper left-hand corner
ACS_LLCORNER + lower left-hand corner
ACS_URCORNER + upper right-hand corner
ACS_LRCORNER + lower right-hand corner
ACS_RTEE + right tee
ACS_LTEE + left tee
ACS_BTEE + bottom tee
ACS_TTEE + top tee
ACS_HLINE - horizontal line
ACS_VLINE | vertical line
ACS_PLUS + plus
ACS_S1 - scan line 1
ACS_S9 _ scan line 9
ACS_DIAMOND + diamond
ACS_CKBOARD : checker board (stipple)
ACS_DEGREE ' degree symbol
ACS_PLMINUS # plus/minus
ACS_BULLET o bullet
ACS_LARROW < arrow pointing left
ACS_RARROW > arrow pointing right
ACS_DARROW v arrow pointing down
ACS_UARROW ^ arrow pointing up
ACS_BOARD # board of squares
ACS_LANTERN # lantern symbol
ACS_BLOCK # solid square block
─────────────────────────────────────────────────
NOTES
The header file <curses.h> automatically includes the header file
<stdio.h>.
Note that addch, mvaddch, mvwaddch, and echochar may be macros.
RETURN VALUES
All routines return the integer ERR upon failure and OK upon successful
completion.
SEE ALSO
Functions: curses(3), curs_attr(3), curs_clear(3), curs_inch(3),
curs_outopts(3), curs_refresh(3), putc(3)
Others: standards(5)curs_addch(3)