ncurses 6.1 - patch 20190406

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

diff --git a/man/curs_get_wstr.3x b/man/curs_get_wstr.3x
index be4dc371adea28d435e88bfd8ba7cedeb7669bf5..6c0d06331bef6c165cf33f2a822e01500d47464c 100644 (file)
--- a/man/curs_get_wstr.3x
+++ b/man/curs_get_wstr.3x
@@ -1,5 +1,5 @@
 .\"***************************************************************************
 .\"***************************************************************************

-.\" Copyright (c) 2002-2012,2017 Free Software Foundation, Inc.              *
+.\" Copyright (c) 2002-2017,2018 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 +26,12 @@
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"

-.\" $Id: curs_get_wstr.3x,v 1.11 2017/03/04 21:24:04 tom Exp $
+.\" $Id: curs_get_wstr.3x,v 1.16 2018/09/01 20:58:10 tom Exp $

 .TH curs_get_wstr 3X ""
 .TH curs_get_wstr 3X ""

+.de bP
+.ie n  .IP \(bu 4
+.el    .IP \(bu 2
+..

 .na
 .hy 0
 .SH NAME
 .na
 .hy 0
 .SH NAME


@@ -67,17 +71,22 @@ The effect of
 is as though a series of calls
 to
 \fBget_wch\fR(3X)
 is as though a series of calls
 to
 \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.
+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.
 .PP
 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.
 .PP

-The user's erase and kill characters are interpreted.  If keypad
+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.
 .PP
 mode is on for the window, \fBKEY_LEFT\fR and \fBKEY_BACKSPACE\fR
 are both considered equivalent to the user's kill character.
 .PP

-Characters input are echoed only if \fBecho\fR is currently on.  In that case,
+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
 backspace is echoed as deletion of the previous character (typically a left
 motion).
 .PP


@@ -161,10 +170,10 @@ 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
 X/Open curses documented these functions to pass an array of \fBwchar_t\fR
 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


@@ -179,6 +188,25 @@ end-of-file character is processed.
 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.
 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 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),
 .SH SEE ALSO
 Functions:
 \fBcurses\fR(3X),