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* @Id: curs_addch.3x,v 1.20 2002/08/10 22:12:36 tom Exp @
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<HTML>
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<HEAD>
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<TITLE>curs_addch 3x</TITLE>
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<link rev=made href="mailto:bug-ncurses@gnu.org">
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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</HEAD>
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<BODY>
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<H1>curs_addch 3x</H1>
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<HR>
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<PRE>
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<!-- Manpage converted by man2html 3.0.1 -->
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</PRE>
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<H2>NAME</H2><PRE>
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<STRONG>addch</STRONG>, <STRONG>waddch</STRONG>, <STRONG>mvaddch</STRONG>, <STRONG>mvwaddch</STRONG>, <STRONG>echochar</STRONG>, <STRONG>wechochar</STRONG> -
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add a character (with attributes) to a <STRONG>curses</STRONG> window, then
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advance the cursor
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</PRE>
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<H2>SYNOPSIS</H2><PRE>
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<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
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<STRONG>int</STRONG> <STRONG>addch(const</STRONG> <STRONG>chtype</STRONG> <STRONG>ch);</STRONG>
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<STRONG>int</STRONG> <STRONG>waddch(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>const</STRONG> <STRONG>chtype</STRONG> <STRONG>ch);</STRONG>
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<STRONG>int</STRONG> <STRONG>mvaddch(int</STRONG> <STRONG>y,</STRONG> <STRONG>int</STRONG> <STRONG>x,</STRONG> <STRONG>const</STRONG> <STRONG>chtype</STRONG> <STRONG>ch);</STRONG>
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<STRONG>int</STRONG> <STRONG>mvwaddch(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>y,</STRONG> <STRONG>int</STRONG> <STRONG>x,</STRONG> <STRONG>const</STRONG> <STRONG>chtype</STRONG> <STRONG>ch);</STRONG>
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<STRONG>int</STRONG> <STRONG>echochar(const</STRONG> <STRONG>chtype</STRONG> <STRONG>ch);</STRONG>
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<STRONG>int</STRONG> <STRONG>wechochar(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>const</STRONG> <STRONG>chtype</STRONG> <STRONG>ch);</STRONG>
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</PRE>
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<H2>DESCRIPTION</H2><PRE>
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The <STRONG>addch</STRONG>, <STRONG>waddch</STRONG>, <STRONG>mvaddch</STRONG> and <STRONG>mvwaddch</STRONG> routines put the
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character <EM>ch</EM> into the given window at its current window
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position, which is then advanced. They are analogous to
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<STRONG>putchar</STRONG> in <STRONG><A HREF="stdio.3.html">stdio(3)</A></STRONG>. If the advance is at the right mar-
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gin, the cursor automatically wraps to the beginning of
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the next line. At the bottom of the current scrolling
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region, if <STRONG>scrollok</STRONG> is enabled, the scrolling region is
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scrolled up one line.
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If <EM>ch</EM> is a tab, newline, or backspace, the cursor is moved
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appropriately within the window. Backspace moves the cur-
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sor one character left; at the left edge of a window it
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does nothing. Newline does a <STRONG>clrtoeol</STRONG>, then moves the
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cursor to the window left margin on the next line,
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scrolling the window if on the last line). Tabs are con-
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sidered to be at every eighth column. The tab interval
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may be altered by setting the <STRONG>TABSIZE</STRONG> variable.
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If <EM>ch</EM> is any control character other than tab, newline, or
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backspace, it is drawn in <STRONG>^</STRONG><EM>X</EM> notation. Calling <STRONG>winch</STRONG>
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after adding a control character does not return the char-
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acter itself, but instead returns the ^-representation of
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the control character.
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Video attributes can be combined with a character argument
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passed to <STRONG>addch</STRONG> or related functions by logical-ORing them
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into the character. (Thus, text, including attributes,
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can be copied from one place to another using <STRONG>inch</STRONG> and
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<STRONG>addch</STRONG>.). See the <STRONG><A HREF="curs_attr.3x.html">curs_attr(3x)</A></STRONG> page for values of prede-
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fined video attribute constants that can be usefully OR'ed
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into characters.
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The <STRONG>echochar</STRONG> and <STRONG>wechochar</STRONG> routines are equivalent to a
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call to <STRONG>addch</STRONG> followed by a call to <STRONG>refresh</STRONG>, or a call to
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<STRONG>waddch</STRONG> followed by a call to <STRONG>wrefresh</STRONG>. The knowledge that
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only a single character is being output is used and, for
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non-control characters, a considerable performance gain
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may be seen by using these routines instead of their
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equivalents.
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<STRONG>Line</STRONG> <STRONG>Graphics</STRONG>
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The following variables may be used to add line drawing
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characters to the screen with routines of the <STRONG>addch</STRONG> fam-
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ily. The default character listed below is used if the
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<STRONG>acsc</STRONG> capability doesn't define a terminal-specific
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replacement for it (but see the EXTENSIONS section below).
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The names are taken from VT100 nomenclature.
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<EM>Name</EM> <EM>Default</EM> <EM>Description</EM>
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--------------------------------------------------
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ACS_BLOCK # solid square block
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ACS_BOARD # board of squares
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ACS_BTEE + bottom tee
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ACS_BULLET o bullet
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ACS_CKBOARD : checker board (stipple)
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ACS_DARROW v arrow pointing down
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ACS_DEGREE ' degree symbol
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ACS_DIAMOND + diamond
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ACS_GEQUAL > greater-than-or-equal-to
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ACS_HLINE - horizontal line
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ACS_LANTERN # lantern symbol
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ACS_LARROW < arrow pointing left
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ACS_LEQUAL < less-than-or-equal-to
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ACS_LLCORNER + lower left-hand corner
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ACS_LRCORNER + lower right-hand corner
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ACS_LTEE + left tee
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ACS_NEQUAL ! not-equal
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ACS_PI * greek pi
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ACS_PLMINUS # plus/minus
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ACS_PLUS + plus
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ACS_RARROW > arrow pointing right
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ACS_RTEE + right tee
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ACS_S1 - scan line 1
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ACS_S3 - scan line 3
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ACS_S7 - scan line 7
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ACS_S9 _ scan line 9
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ACS_STERLING f pound-sterling symbol
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ACS_TTEE + top tee
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ACS_UARROW ^ arrow pointing up
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ACS_ULCORNER + upper left-hand corner
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ACS_URCORNER + upper right-hand corner
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ACS_VLINE | vertical line
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</PRE>
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<H2>RETURN VALUE</H2><PRE>
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All routines return the integer <STRONG>ERR</STRONG> upon failure and <STRONG>OK</STRONG> on
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success (the SVr4 manuals specify only "an integer value
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other than <STRONG>ERR</STRONG>") upon successful completion, unless other-
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wise noted in the preceding routine descriptions.
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</PRE>
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<H2>NOTES</H2><PRE>
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Note that <STRONG>addch</STRONG>, <STRONG>mvaddch</STRONG>, <STRONG>mvwaddch</STRONG>, and <STRONG>echochar</STRONG> may be
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macros.
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</PRE>
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<H2>PORTABILITY</H2><PRE>
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All these functions are described in the XSI Curses stan-
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dard, Issue 4. The defaults specified for forms-drawing
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characters apply in the POSIX locale.
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Some ACS symbols (ACS_S3, ACS_S7, ACS_LEQUAL, ACS_GEQUAL,
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ACS_PI, ACS_NEQUAL, ACS_STERLING) were not documented in
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any publicly released System V. However, many publicly
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available terminfos include <STRONG>acsc</STRONG> strings in which their
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key characters (pryz{|}) are embedded, and a second-hand
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list of their character descriptions has come to light.
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The ACS-prefixed names for them were invented for
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<STRONG><A HREF="ncurses.3x.html">ncurses(3x)</A></STRONG>.
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The <STRONG>TABSIZE</STRONG> variable is implemented in some versions of
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curses, but is not part of X/Open curses.
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</PRE>
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<H2>SEE ALSO</H2><PRE>
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<STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_attr.3x.html">curs_attr(3x)</A></STRONG>, <STRONG><A HREF="curs_clear.3x.html">curs_clear(3x)</A></STRONG>, <STRONG><A HREF="curs_inch.3x.html">curs_inch(3x)</A></STRONG>,
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<STRONG><A HREF="curs_outopts.3x.html">curs_outopts(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>, <STRONG><A HREF="putc.3S.html">putc(3S)</A></STRONG>.
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</PRE>
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<HR>
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<ADDRESS>
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Man(1) output converted with
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<a href="http://www.oac.uci.edu/indiv/ehood/man2html.html">man2html</a>
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</ADDRESS>
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