curs_addch(3X) DG/UX R4.11MU05 curs_addch(3X)
NAME
curs_addch: addch, waddch, mvaddch, mvwaddch, echochar, wechochar -
add a character (with attributes) to a curses window
SYNOPSIS
#include <curses.h>
addch(chtype ch);
waddch(WINDOW *win, chtype ch);
mvaddch(int y, int x, chtype ch);
mvwaddch(WINDOW *win, int y, int x, chtype ch);
echochar(chtype ch);
wechochar(WINDOW *win, chtype ch);
DESCRIPTION
With the addch, waddch, mvaddch and mvwaddch routines, the character
ch is put into the window at the current cursor position of the
window and the position of the window cursor is advanced. Its
function is similar to that of putchar. 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, the cursor is moved
appropriately within the window. A newline also does a 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
control character, but instead returns the representation of the
control character.
Video attributes can be combined with a character by OR-ing them into
the parameter. This results in these attributes also being set.
(The intent here is that text, including attributes, can be copied
from one place to another using inch and addch.) [see standout,
predefined video attribute constants, on the curs_attr(3X) 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
followed by a call to wrefresh. The knowledge that only a single
character is being output is taken into consideration and, for non-
control characters, a considerable performance gain might 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. When variables are
defined for the terminal, the A_ALTCHARSET bit is turned on [see
curs_attr(3X)]. Otherwise, the default character listed below is
stored in the variable. The names chosen 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
---------------------------------------------------
RETURN VALUE
All routines return the integer ERR upon failure and an integer value
other than ERR upon successful completion, unless otherwise noted in
the preceding routine descriptions.
NOTES
The header file <curses.h> automatically includes the header files
<stdio.h> and <unctrl.h>.
Note that addch, mvaddch, mvwaddch, and echochar may be macros.
SEE ALSO
curses(3X), curs_attr(3X), curs_clear(3X), curs_inch(3X),
curs_outopts(3X), curs_refresh(3X) putc(3S).
Licensed material--property of copyright holder(s)