Content-type: text/html Man page of curs_addwch


Section: C Library Functions (3)
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curs_addwch, addwch, waddwch, mvaddwch, mvwaddwch, echowchar, wechowchar - Add a wchar_t character (with attributes) to a Curses window and advance cursor  


#include <curses.h>

int addwch( chtype wch ); int waddwch( WINDOW *win, chtype wch ); int mvaddwch( int y, int x, chtype wch ); int mvwaddwch( WINDOW *win, int y, int x, chtype wch ); int echowchar( chtype wch ); int wechowchar( WINDOW *win, chtype wch );


Curses Library (libcurses)


The addwch, waddwch, mvaddwch, and mvwaddwch routines put the character wch, holding a wchar_t character, 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 putwchar in the Standard C Library. At the right margin, the routines perform an automatic newline. At the bottom of the scrolling region, if scrollok is enabled, the routines scroll the scrolling region up one line.

If wch is a tab, newline, or backspace, the routines move the cursor appropriately within the window. A newline also results in clrtoeol before moving. Tabs are considered to be at every eighth column. If wch is another control character, it is drawn in the ^X notation. Calling winwch 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 wchar_t character in the parameter by means of an inclusive OR operation. This operation also sets the attributes. (The intent here is to allow text, including attributes, to be copied from one place to another by using inwch and addwch. See the discussion of standout, predefined video attribute constants, in the curs_attr(3) reference page.)

The echowchar and wechowchar routines are functionally equivalent to a call to addwch followed by a call to refresh, or a call to waddwch followed by a call to wrefresh. The knowledge that only a single character is being output is taken into consideration and, for noncontrol 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 addwch 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 in the following list is stored in the variable. The variable names 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 addwch, mvaddwch, mvwaddwch, and echowchar may be macros.

The routines described on this reference page are among the MNLS Curses functions that are not included in the X/Open Curses CAE specification. MNLS routines are supported only for backward compatibility reasons. Compaq recommends the use of the *add_wch and *echo_wchar functions in new applications (see curs_add_wch(3)).


All routines return the integer ERR upon failure and OK upon successful completion, unless otherwise noted in the preceding routine descriptions.


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



Line Graphics

This document was created by man2html, using the manual pages.
Time: 02:42:05 GMT, October 02, 2010