ncurses 6.2 - patch 20201219

[ncurses.git] / man / curs_get_wstr.3x

diff --git a/man/curs_get_wstr.3x b/man/curs_get_wstr.3x
index 86a5b82a11fc869af7f1b9360306d0a5afe3b72d..112208ae918ef60bff486e71fb7ce9c58d8bdac0 100644 (file)
--- a/man/curs_get_wstr.3x
+++ b/man/curs_get_wstr.3x
@@ -1,5 +1,6 @@
 .\"***************************************************************************
 .\"***************************************************************************

-.\" Copyright (c) 2002,2003 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            *
 .\"                                                                          *
 .\" Permission is hereby granted, free of charge, to any person obtaining a  *
 .\" copy of this software and associated documentation files (the            *


@@ -26,8 +27,18 @@
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"

-.\" $Id: curs_get_wstr.3x,v 1.3 2003/07/05 11:15:28 tom Exp $
+.\" $Id: curs_get_wstr.3x,v 1.21 2020/10/17 23:17:24 tom Exp $

 .TH curs_get_wstr 3X ""
 .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,
 .SH NAME
 \fBget_wstr\fR,
 \fBgetn_wstr\fR,


@@ -37,10 +48,12 @@
 \fBmvgetn_wstr\fR,
 \fBmvwget_wstr\fR,
 \fBmvwgetn_wstr\fR \- get an array of wide characters from a curses terminal keyboard
 \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
 .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 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


@@ -48,7 +61,7 @@
 \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
 \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
 \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


@@ -62,28 +75,33 @@ The effect of
 \fBget_wstr\fR
 is as though a series of calls
 to
 \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.
 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.
 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).
 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.
 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
 The effect of
 \fBmvget_wstr\fR
 is as though a call to


@@ -92,7 +110,7 @@ and then a series of calls to
 \fBget_wch\fR
 were
 made.
 \fBget_wch\fR
 were
 made.

-
+.PP

 The effect of
 \fBmvwget_wstr\fR
 is as though a call to
 The effect of
 \fBmvwget_wstr\fR
 is as though a call to


@@ -100,7 +118,7 @@ is as though a call to
 and then a series of calls to
 \fBwget_wch\fR
 were made.
 and then a series of calls to
 \fBwget_wch\fR
 were made.

-
+.PP

 The
 \fBgetn_wstr\fR,
 \fBmvgetn_wstr\fR,
 The
 \fBgetn_wstr\fR,
 \fBmvgetn_wstr\fR,


@@ -135,33 +153,67 @@ The use of
 \fBmvgetn_wstr\fR,
 \fBmvwgetn_wstr\fR, or
 \fBwgetn_wstr\fR, respectively, is recommended.
 \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.
 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.
 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.
 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.
 .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,
 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
 and the returned array contains a \fBWEOF\fR followed by a null \fBwchar_t\fR.
 .PP

-X/Open curses documents these functions to pass an array of \fBwchar_t\fR,
-but all of the vendors implement this using \fBwint_t\fR.
+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).
 .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: