.\"***************************************************************************
-.\" Copyright (c) 2002 Free Software Foundation, Inc. *
+.\" Copyright 2018-2019,2020 Thomas E. Dickey *
+.\" Copyright 2002-2012,2017 Free Software Foundation, Inc. *
.\" *
.\" Permission is hereby granted, free of charge, to any person obtaining a *
.\" copy of this software and associated documentation files (the *
.\" authorization. *
.\"***************************************************************************
.\"
-.\" $Id: curs_get_wstr.3x,v 1.2 2002/05/18 21:48:15 tom Exp $
+.\" $Id: curs_get_wstr.3x,v 1.21 2020/10/17 23:17:24 tom Exp $
.TH curs_get_wstr 3X ""
+.ie \n(.g .ds `` \(lq
+.el .ds `` ``
+.ie \n(.g .ds '' \(rq
+.el .ds '' ''
+.de bP
+.ie n .IP \(bu 4
+.el .IP \(bu 2
+..
+.na
+.hy 0
.SH NAME
\fBget_wstr\fR,
\fBgetn_wstr\fR,
\fBmvgetn_wstr\fR,
\fBmvwget_wstr\fR,
\fBmvwgetn_wstr\fR \- get an array of wide characters from a curses terminal keyboard
+.ad
+.hy
.SH SYNOPSIS
.nf
\fB#include <curses.h>\fR
-
+.sp
\fBint get_wstr(wint_t *\fR\fIwstr\fR\fB);\fR
.br
\fBint getn_wstr(wint_t *\fR\fIwstr\fR\fB, int \fR\fIn\fR\fB);\fR
\fBint wget_wstr(WINDOW *\fR\fIwin\fR\fB, wint_t *\fR\fIwstr\fR\fB);\fR
.br
\fBint wgetn_wstr(WINDOW *\fR\fIwin\fR\fB, wint_t *\fR\fIwstr\fR\fB, int \fR\fIn\fR\fB);\fR
-.br
+.sp
\fBint mvget_wstr(int \fR\fIy\fR\fB, int \fR\fIx\fR\fB, wint_t *\fR\fIwstr\fR\fB);\fR
.br
\fBint mvgetn_wstr(int \fR\fIy\fR\fB, int \fR\fIx\fR\fB, wint_t *\fR\fIwstr\fR\fB, int \fR\fIn\fR\fB);\fR
\fBget_wstr\fR
is as though a series of calls
to
-\fBget_wch\fR
-were made, until a newline, other end-of-line, or end-of-file condition is processed.
-An end-of-file condition is represented by \fBWEOF\fR, as defined in \fB<wchar.h>\fR.
-The newline and end-of-line conditions are represented by the \fB\\n\fR \fBwchar_t\fR value.
+\fBget_wch\fR(3X)
+were made, until a newline, other end-of-line,
+or end-of-file condition is processed.
+An end-of-file condition is represented by \fBWEOF\fR,
+as defined in \fB<wchar.h>\fR.
+The newline and end-of-line conditions are represented
+by the \fB\\n\fR \fBwchar_t\fR value.
In all instances, the end of the string is terminated by a null \fBwchar_t\fR.
The routine places resulting values in the area pointed to by \fIwstr\fR.
-
-The user's erase and kill characters are interpreted. If keypad
+.PP
+The user's erase and kill characters are interpreted.
+If keypad
mode is on for the window, \fBKEY_LEFT\fR and \fBKEY_BACKSPACE\fR
are both considered equivalent to the user's kill character.
-
-Characters input are echoed only if \fBecho\fR is currently on. In that case,
+.PP
+Characters input are echoed only if \fBecho\fR is currently on.
+In that case,
backspace is echoed as deletion of the previous character (typically a left
motion).
-
+.PP
The effect of
\fBwget_wstr\fR
is as though a series of
calls to
\fBwget_wch\fR
were made.
-
+.PP
The effect of
\fBmvget_wstr\fR
is as though a call to
\fBget_wch\fR
were
made.
-
+.PP
The effect of
\fBmvwget_wstr\fR
is as though a call to
and then a series of calls to
\fBwget_wch\fR
were made.
-
+.PP
The
\fBgetn_wstr\fR,
\fBmvgetn_wstr\fR,
\fBmvgetn_wstr\fR,
\fBmvwgetn_wstr\fR, or
\fBwgetn_wstr\fR, respectively, is recommended.
-
+.PP
These functions cannot return \fBKEY_\fR values because there
is no way to distinguish a \fBKEY_\fR value from a valid \fBwchar_t\fR value.
-
+.PP
All of these routines except \fBwgetn_wstr\fR may be macros.
-.SH RETURN VALUES
+.SH RETURN VALUE
All of these functions return \fBOK\fR upon successful completion.
Otherwise, they return \fBERR\fR.
+.PP
+Functions using a window parameter return an error if it is null.
+.RS
+.TP 5
+\fBwgetn_wstr\fP
+returns an error if the associated call to \fBwget_wch\fP failed.
+.RE
+.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.
.SH PORTABILITY
These functions are described in The Single Unix Specification, Version 2.
No error conditions are defined.
-This implementation returns ERR if the window pointer is null,
-or if the lower-level \fBwget_wch\fR call returns an ERR.
+This implementation returns \fBERR\fP if the window pointer is null,
+or if the lower-level \fBwget_wch\fR call returns an \fBERR\fP.
In the latter case,
-an ERR return without other data is treated as an end-of-file condition,
+an \fBERR\fP return without other data is treated as an end-of-file condition,
and the returned array contains a \fBWEOF\fR followed by a null \fBwchar_t\fR.
+.PP
+X/Open curses documented these functions to pass an array of \fBwchar_t\fR
+in 1997, but that was an error because of this part of the description:
+.RS
+.PP
+The effect of \fIget_wstr()\fP is as though a series of calls to
+\fIget_wch()\fP were made, until a newline character, end-of-line character, or
+end-of-file character is processed.
+.RE
+.PP
+The latter function \fIget_wch()\fP can return a negative value,
+while \fBwchar_t\fP is a unsigned type.
+All of the vendors implement this using \fBwint_t\fR, following the standard.
+.PP
+X/Open Curses, Issue 7 (2009) is unclear regarding whether
+the terminating \fInull \fP\fBwchar_t\fP
+value is counted in the length parameter \fIn\fP.
+X/Open Curses, Issue 7 revised the corresponding description
+of \fBwgetnstr\fP to address this issue.
+The unrevised description of \fBwget_nwstr\fP can be interpreted either way.
+This implementation counts the terminator in the length.
+.PP
+X/Open Curses does not specify what happens if the length \fIn\fP is negative.
+.bP
+For analogy with \fBwgetnstr\fP,
+ncurses 6.2 uses a limit (based on \fBLINE_MAX\fP).
+.bP
+Some other implementations (such as Solaris xcurses) do the same,
+while others (PDCurses) do not allow this.
+.bP
+NetBSD 7 curses imitates ncurses 6.1 in this regard,
+treating a \fB\-1\fP as an indefinite number of characters.
.SH SEE ALSO
Functions:
\fBcurses\fR(3X),
\fBcurs_get_wch\fR(3X),
\fBcurs_getstr\fR(3X).
-.\"#
-.\"# The following sets edit modes for GNU EMACS
-.\"# Local Variables:
-.\"# mode:nroff
-.\"# fill-column:79
-.\"# End:
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