Content-type: text/html Man page of curs_addch


Section: C Library Functions (3)
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curs_addch, addch, waddch, mvaddch, mvwaddch, echochar, wechochar - Add a character (with attributes) to a Curses window and 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 );


Curses Library (libcurses)


Interfaces documented on this reference page conform to industry standards as follows:

addch, waddch, mvaddch, mvwaddch:  XPG4, XPG4-UNIX

echochar, wechochar:  XPG4-UNIX

Refer to the standards(5) reference page for more information about industry standards and associated tags.


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 control 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 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 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 following list is stored in the variable. The names chosen for variables are consistent with the VT100 nomenclature.

NameDefaultGlyph 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_S1-scan line 1
ACS_S9_scan line 9
ACS_CKBOARD:checker board (stipple)
ACS_DEGREE'degree symbol
ACS_LARROW<arrow pointing left
ACS_RARROW>arrow pointing right
ACS_DARROWvarrow pointing down
ACS_UARROW^arrow pointing up
ACS_BOARD#board of squares
ACS_LANTERN#lantern symbol
ACS_BLOCK#solid square block



The header file <curses.h> automatically includes the header file <stdio.h>.

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


All routines return the integer ERR upon failure and OK upon successful completion.


Functions: curses(3), curs_attr(3), curs_clear(3), curs_inch(3), curs_outopts(3), curs_refresh(3), putc(3)

Others: standards(5)



Line Graphics

This document was created by man2html, using the manual pages.
Time: 02:41:13 GMT, October 02, 2010