114 lines
4.3 KiB
Groff
114 lines
4.3 KiB
Groff
.TH curs_addch 3X ""
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.SH NAME
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\fBcurs_addch\fR: \fBaddch\fR, \fBwaddch\fR, \fBmvaddch\fR, \fBmvwaddch\fR,
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\fBechochar\fR, \fBwechochar\fR - add a character (with attributes) to a
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\fBncurses\fR window, then advance the cursor
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.SH SYNOPSIS
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\fB#include <ncurses.h>\fR
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\fBaddch(chtype ch);\fR
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.br
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\fBwaddch(WINDOW *win, chtype ch);\fR
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.br
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\fBmvaddch(int y, int x, chtype ch);\fR
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.br
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\fBmvwaddch(WINDOW *win, int y, int x, chtype ch);\fR
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.br
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\fBechochar(chtype ch);\fR
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.br
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\fBwechochar(WINDOW *win, chtype ch);\fR
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.br
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.SH DESCRIPTION
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The \fBaddch\fR, \fBwaddch\fR, \fBmvaddch\fR and \fBmvwaddch\fR routines put
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the character \fIch\fR into the given window at its current window position,
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which is then advanced. They are analogous to \fBputchar\fR in \fBstdio\fR(3).
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If the advance is at the right margin, the cursor automatically wraps to the
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beginning of the next line. At the bottom of the scrolling region, if
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\fBscrollok\fR is enabled, the scrolling region is scrolled up one line.
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If \fIch\fR is a tab, newline, or backspace, the cursor is moved appropriately
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within the window. A newline also does a \fBclrtoeol\fR before moving. Tabs
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are considered to be at every eighth column.
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If \fIch\fR is any control character other than tab, newline, or backspace, it
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is drawn in \fB^\fR\fIX\fR notation. Calling \fBwinch\fR after adding a
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control character does not return the control character, but instead returns
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the representation of the control character. (To emit control characters
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literally, use \fBechochar\fR.)
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Video attributes can be combined with a character by OR-ing them into the
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parameter. This results in these attributes also being set. (The intent here
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is that text, including attributes, can be copied from one place to another
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using \fBinch\fR and \fBaddch\fR.) [see \fBstandout\fR, predefined video
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attribute constants, on the curs_attr(3X) page].
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The \fBechochar\fR and \fBwechochar\fR routines are functionally equivalent to
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a call to \fBaddch\fR followed by a call to \fBrefresh\fR, or a call to
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\fBwaddch\fR followed by a call to \fBwrefresh\fR. The knowledge that only a
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single character is being output is taken into consideration and, for
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non-control characters, a considerable performance gain might be seen by using
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these routines instead of their equivalents.
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.SS Line Graphics
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The following variables may be used to add line drawing characters to the
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screen with routines of the \fBaddch\fR family. The default character listed
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below is used if the \fBacsc\fR capability doesn't define a terminal-specific
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replacement for it. The names are taken from the the VT100 nomenclature.
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.TS
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l l l
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_ _ _
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l l l.
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\fIName\fR \fIDefault\fR \fIDescription\fR
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ACS_ULCORNER + upper left-hand corner
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ACS_LLCORNER + lower left-hand corner
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ACS_URCORNER + upper right-hand corner
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ACS_LRCORNER + lower right-hand corner
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ACS_RTEE + right tee
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ACS_LTEE + left tee
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ACS_BTEE + bottom tee
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ACS_TTEE + top tee
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ACS_HLINE - horizontal line
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ACS_VLINE | vertical line
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ACS_PLUS + plus
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ACS_S1 - scan line 1
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ACS_S9 \&_ scan line 9
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ACS_DIAMOND + diamond
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ACS_CKBOARD : checker board (stipple)
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ACS_DEGREE ' degree symbol
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ACS_PLMINUS # plus/minus
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ACS_BULLET o bullet
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ACS_LARROW < arrow pointing left
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ACS_RARROW > arrow pointing right
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ACS_DARROW v arrow pointing down
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ACS_UARROW ^ arrow pointing up
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ACS_BOARD # board of squares
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ACS_LANTERN # lantern symbol
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ACS_BLOCK # solid square block
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.TE
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.SH RETURN VALUE
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All routines return the integer \fBERR\fR upon failure and an integer value
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other than \fBERR\fR upon successful completion, unless otherwise noted in the
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preceding routine descriptions.
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.SH BUGS
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.SH NOTES
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Note that \fBaddch\fR, \fBmvaddch\fR, \fBmvwaddch\fR, and
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\fBechochar\fR may be macros.
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On 386 and 486 consoles, giving \fBwechochar\fR an argument with its high
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bit set will produce the corresponding high-half ASCIIZ graphic (SVr4 curses
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also has this feature but does not document it). A control-character argument,
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however, will not typically produce the corresponding graphic;
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characters such as CR, NL, FF and TAB are typically interpreted by the console
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driver itself, and ESC will be interpreted as the leader of a control sequence.
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.SH SEE ALSO
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\fBncurses\fR(3X), \fBcurs_attr\fR(3X), \fBcurs_clear\fR(3X),
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\fBcurs_inch\fR(3X), \fBcurs_outopts\fR(3X), \fBcurs_refresh\fR(3X),
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\fBputc\fR(3S).
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.\"#
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.\"# The following sets edit modes for GNU EMACS
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.\"# Local Variables:
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.\"# mode:nroff
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.\"# fill-column:79
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.\"# End:
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