from small one page howto to huge articles all in one place
poll results
Last additions:
May 25th. 2007:
April, 26th. 2006:
| You are here: manpages
curs_addch
Section: Miscellaneous Library Functions (3X)
Updated:
Index
Return to Main Contents
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 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 appropriately 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 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 characters.
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 routines of the addch family. The default character listed
below is used if the acsc capability does not define a terminal-specific
replacement for it.
The names are taken from VT100 nomenclature.
| Name | Default | Description
|
|
|
|
| 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 specify only "an integer value other than ERR") upon
successful completion, unless otherwise noted in the preceding routine
descriptions.
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 specified for forms-drawing characters apply in the POSIX locale.
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.
SEE ALSO
curses(3X),
curs_attr(3X),
curs_clear(3X),
curs_inch(3X),
curs_outopts(3X),
curs_refresh(3X),
putc(3).
Comparable functions in the wide-character (ncursesw) library are
described in
curs_add_wch(3X).
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- Line Graphics
-
- RETURN VALUE
-
- NOTES
-
- PORTABILITY
-
- SEE ALSO
-
Please read "Why adblockers are badwww.cars2fast4u.de
| 
|
|
- Running on 
-
:
: 
