.\" authorization. *
.\"***************************************************************************
.\"
-.\" $Id: curs_add_wchstr.3x,v 1.34 2024/03/16 19:44:53 tom Exp $
-.TH curs_add_wchstr 3X 2024-03-16 "ncurses @NCURSES_MAJOR@.@NCURSES_MINOR@" "Library calls"
+.\" $Id: curs_add_wchstr.3x,v 1.40 2024/05/11 20:39:53 tom Exp $
+.TH curs_add_wchstr 3X 2024-05-11 "ncurses @NCURSES_MAJOR@.@NCURSES_MINOR@" "Library calls"
.ie \n(.g \{\
.ds `` \(lq
.ds '' \(rq
\fB#include <curses.h>
.PP
\fBint add_wchstr(const cchar_t *\fIwchstr\fP);
-\fBint add_wchnstr(const cchar_t *\fIwchstr\fP, int \fIn\fP);
\fBint wadd_wchstr(WINDOW * \fIwin\fP, const cchar_t *\fIwchstr\fP);
-\fBint wadd_wchnstr(WINDOW * \fIwin\fP, const cchar_t *\fIwchstr\fP, int \fIn\fP);
-.PP
\fBint mvadd_wchstr(int \fIy\fP, int \fIx\fP, const cchar_t *\fIwchstr\fP);
-\fBint mvadd_wchnstr(int \fIy\fP, int \fIx\fP, const cchar_t *\fIwchstr\fP, int \fIn\fP);
\fBint mvwadd_wchstr(WINDOW *\fIwin\fP, int \fIy\fP, int \fIx\fP, const cchar_t *\fIwchstr\fP);
+.PP
+\fBint add_wchnstr(const cchar_t *\fIwchstr\fP, int \fIn\fP);
+\fBint wadd_wchnstr(WINDOW * \fIwin\fP, const cchar_t *\fIwchstr\fP, int \fIn\fP);
+\fBint mvadd_wchnstr(int \fIy\fP, int \fIx\fP, const cchar_t *\fIwchstr\fP, int \fIn\fP);
\fBint mvwadd_wchnstr(WINDOW *\fIwin\fP, int \fIy\fP, int \fIx\fP, const cchar_t *\fIwchstr\fP, int \fIn\fP);
.fi
.SH DESCRIPTION
-These functions copy the (null-terminated)
-array of complex characters \fIwchstr\fP
-into the window image structure
-starting at the current cursor position.
-.PP
-The four functions with \fIn\fP as the last
-argument copy at most \fIn\fP elements,
-but no more than will fit on the line.
-If \fBn\fP=\fB\-1\fP then the whole array is copied,
-to the maximum number of characters that will fit on the line.
+.B \%wadd_wchstr
+copies the string of complex characters
+.I \%wchstr
+to the window
+.IR win "."
+A null complex character terminates the string.
+If a complex character does completely fit at the end of the line,
+.I curses
+fills the remaining columns with the window background;
+see \fB\%bkgrnd\fP(3X).
+.B \%wadd_wchnstr
+does the same,
+but copies at most
+.I n
+characters,
+or as many as possible if
+.I n
+is
+.BR \-1 "."
+\fB\%ncurses\fP(3X) describes the variants of these functions.
.PP
-The window cursor is \fInot\fP advanced.
-These functions are faster than \fBwaddnstr\fP.
-On the other hand:
+Because these functions do not call \fB\%wadd_wch\fP(3X) internally,
+they are faster than \fB\%waddwstr\fP(3X) and \fB\%waddnwstr\fP(3X).
+On the other hand,
+they
.bP
-they do not perform checking
-(such as for the newline, backspace, or carriage return characters),
+do not treat the backspace,
+carriage return,
+or line feed characters specially;
.bP
-they do not advance the current cursor position,
+do not represent unprintable characters with \fB\%wunctrl\fP(3X);
.bP
-they do not expand other control characters to ^-escapes, and
+do not update the cursor position to follow the last character written;
.bP
-they truncate the string if it crosses the right margin,
-rather than wrapping it around to the new line.
-.PP
-These functions end successfully
-on encountering a null \fBcchar_t\fP, or
-when they have filled the current line.
-If a complex character cannot completely fit at the end of the current line,
-the remaining columns are filled with the background character and rendition.
+truncate the string at the window's right margin,
+rather than wrapping it to the next line and potentially scrolling.
.SH RETURN VALUE
-All functions return the integer \fBERR\fP upon failure and \fBOK\fP on success.
+These functions return
+.B OK
+on success and
+.B ERR
+on failure.
.PP
X/Open Curses does not specify any error conditions.
-This implementation returns an error
+.I \%ncurses
+returns
+.B ERR
+if
.bP
-if the \fIwin\fP parameter is null or
+.I win
+is
+.B NULL
+or
.bP
-if the \fIwchstr\fP parameter is null.
+.I wchstr
+is
+.BR NULL "."
.PP
-Functions with a \*(``mv\*('' prefix first perform a cursor movement using
-\fBwmove\fP, and return an error if the position is outside the window,
-or if the window pointer is null.
+Functions prefixed with \*(``mv\*('' first perform cursor movement and
+fail if the position
+.RI ( y ,
+.IR x )
+is outside the window boundaries.
.SH NOTES
-All functions except \fBwadd_wchnstr\fP may be macros.
+All of these functions except
+.B \%wadd_wchnstr
+may be implemented as macros.
.SH PORTABILITY
-These functions are described in the XSI Curses standard, Issue 4.
+X/Open Curses,
+Issue 4 describes these functions.
.SH SEE ALSO
+\fB\%curs_addchstr\fP(3X) describes comparable functions of the
+.I \%ncurses
+library in its non-wide-character configuration.
+.PP
\fB\%curses\fP(3X),
-\fB\%curs_addch\fP(3X),
-\fB\%curs_addchstr\fP(3X),
-\fB\%curs_addstr\fP(3X),
\fB\%curs_addwstr\fP(3X),
\fB\%curs_add_wch\fP(3X)
projects / ncurses.git / blobdiff