.\"***************************************************************************
-.\" Copyright (c) 2002-2018,2019 Free Software Foundation, Inc. *
+.\" Copyright 2018-2023,2024 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 1.19 2019/11/30 20:59:22 tom Exp $
-.TH curs_get_wstr 3X ""
-.ie \n(.g .ds `` \(lq
-.el .ds `` ``
-.ie \n(.g .ds '' \(rq
-.el .ds '' ''
+.\" $Id: curs_get_wstr.3x,v 1.48 2024/04/20 19:18:18 tom Exp $
+.TH curs_get_wstr 3X 2024-04-20 "ncurses @NCURSES_MAJOR@.@NCURSES_MINOR@" "Library calls"
+.ie \n(.g \{\
+.ds `` \(lq
+.ds '' \(rq
+.\}
+.el \{\
+.ie t .ds `` ``
+.el .ds `` ""
+.ie t .ds '' ''
+.el .ds '' ""
+.\}
+.
.de bP
.ie n .IP \(bu 4
.el .IP \(bu 2
..
-.na
-.hy 0
.SH NAME
-\fBget_wstr\fR,
-\fBgetn_wstr\fR,
-\fBwget_wstr\fR,
-\fBwgetn_wstr\fR,
-\fBmvget_wstr\fR,
-\fBmvgetn_wstr\fR,
-\fBmvwget_wstr\fR,
-\fBmvwgetn_wstr\fR \- get an array of wide characters from a curses terminal keyboard
-.ad
-.hy
+\fB\%get_wstr\fP,
+\fB\%getn_wstr\fP,
+\fB\%wget_wstr\fP,
+\fB\%wgetn_wstr\fP,
+\fB\%mvget_wstr\fP,
+\fB\%mvgetn_wstr\fP,
+\fB\%mvwget_wstr\fP,
+\fB\%mvwgetn_wstr\fP \-
+get a wide-character string from a \fIcurses\fR terminal keyboard
.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
-.br
-\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
-\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
-.br
-\fBint mvwget_wstr(WINDOW *\fR\fIwin\fR\fB, int \fR\fIy\fR\fB, int \fR\fIx\fR\fB, wint_t *\fR\fIwstr\fR\fB);\fR
-.br
-\fBint mvwgetn_wstr(WINDOW *\fR\fIwin\fR\fB, int \fR\fIy\fR\fB, int \fR\fIx\fR\fB, wint_t *\fR\fIwstr\fR\fB, int \fR\fIn\fR\fB);\fR
+\fB#include <curses.h>
+.PP
+\fBint get_wstr(wint_t *\fIwstr\fP);
+\fBint getn_wstr(wint_t *\fIwstr\fP, int \fIn\fP);
+\fBint wget_wstr(WINDOW *\fIwin\fP, wint_t *\fIwstr\fP);
+\fBint wgetn_wstr(WINDOW *\fIwin\fP, wint_t *\fIwstr\fP, int \fIn\fP);
+.PP
+\fBint mvget_wstr(int \fIy\fP, int \fIx\fP, wint_t *\fIwstr\fP);
+\fBint mvgetn_wstr(int \fIy\fP, int \fIx\fP, wint_t *\fIwstr\fP, int \fIn\fP);
+\fBint mvwget_wstr(WINDOW *\fIwin\fP, int \fIy\fP, int \fIx\fP, wint_t *\fIwstr\fP);
+\fBint mvwgetn_wstr(WINDOW *\fIwin\fP, int \fIy\fP, int \fIx\fP, wint_t *\fIwstr\fP, int \fIn\fP);
.fi
.SH DESCRIPTION
-The effect of
-\fBget_wstr\fR
-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.
-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
-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.
+The function
+\fBwgetn_wstr\fP
+is equivalent to a series of calls to
+\fBwget_wch\fP(3X)
+until a newline or carriage return terminates the series:
+.bP
+The terminating character is not included in the returned string.
+.bP
+An end-of-file condition is represented by \fBWEOF\fP,
+as defined in \fB<wchar.h>\fP.
+.bP
+In all instances, the end of the string is terminated
+by a null \fBwchar_t\fP.
+.bP
+The function stores the result in the area pointed to
+by the \fIwstr\fP parameter.
+.bP
+The function reads at most \fIn\fP characters,
+thus preventing a possible overflow of the input buffer.
+.IP
+Any attempt to enter more characters
+(other than the terminating newline or carriage return)
+causes a beep.
+.IP
+Function keys also cause a beep and are ignored.
+.PP
+The user's \fIerase\fP and \fIkill\fP characters are interpreted:
+.bP
+The \fIerase\fP character (e.g., \fB^H\fP) erases the character
+at the end of the buffer, moving the cursor to the left.
+.IP
+If \fIkeypad\fP mode is on for the window,
+\fBKEY_LEFT\fP and \fBKEY_BACKSPACE\fP
+are both considered equivalent to the user's \fIerase\fP character.
+.bP
+The \fIkill\fP character (e.g., \fB^U\fP) erases the entire buffer,
+leaving the cursor at the beginning of the buffer.
+.PP
+Characters input are echoed only if \fBecho\fP 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
-\fBmove\fR
-and then a series of calls to
-\fBget_wch\fR
-were
-made.
-.PP
-The effect of
-\fBmvwget_wstr\fR
-is as though a call to
-\fBwmove\fR
-and then a series of calls to
-\fBwget_wch\fR
-were made.
+backspace is echoed as deletion of the previous character
+(typically a left motion).
.PP
The
-\fBgetn_wstr\fR,
-\fBmvgetn_wstr\fR,
-\fBmvwgetn_wstr\fR, and
-\fBwgetn_wstr\fR
+\fBgetn_wstr\fP,
+\fBmvgetn_wstr\fP,
+\fBmvwgetn_wstr\fP, and
+\fBwgetn_wstr\fP
functions are identical
to the
-\fBget_wstr\fR,
-\fBmvget_wstr\fR,
-\fBmvwget_wstr\fR, and
-\fBwget_wstr\fR
+\fBget_wstr\fP,
+\fBmvget_wstr\fP,
+\fBmvwget_wstr\fP, and
+\fBwget_wstr\fP
functions, respectively,
except that the
-\fB*n_*\fR
+\fB*n_*\fP
versions read at most
-\fIn\fR
+\fIn\fP
characters, letting the application prevent overflow of the
input buffer.
+.SH RETURN VALUE
+All of these functions return the integer \fBOK\fP upon successful completion.
+If unsuccessful, they return \fBERR\fP.
+.PP
+X/Open defines no error conditions.
+.PP
+In this implementation,
+these functions return an error
+.bP
+if the window pointer is null,
+.bP
+if its timeout expires without having any data, or
+.bP
+if the associated call to
+\fBwget_wch\fP
+failed.
+.PP
+Functions prefixed with \*(``mv\*('' first perform cursor movement and
+fail if the position
+.RI ( y ,
+.IR x )
+is outside the window boundaries.
.SH NOTES
+Any of these functions other than
+\fBwgetn_wstr\fP
+may be macros.
+.PP
Using
-\fBget_wstr\fR,
-\fBmvget_wstr\fR,
-\fBmvwget_wstr\fR, or
-\fBwget_wstr\fR
+\fBget_wstr\fP,
+\fBmvget_wstr\fP,
+\fBmvwget_wstr\fP, or
+\fBwget_wstr\fP
to read a line that
overflows the array pointed to by
-\fBwstr\fR
+\fBwstr\fP
causes undefined
results.
The use of
-\fBgetn_wstr\fR,
-\fBmvgetn_wstr\fR,
-\fBmvwgetn_wstr\fR, or
-\fBwgetn_wstr\fR, respectively, is recommended.
+\fBgetn_wstr\fP,
+\fBmvgetn_wstr\fP,
+\fBmvwgetn_wstr\fP, or
+\fBwgetn_wstr\fP,
+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 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.
+These functions cannot return \fBKEY_\fP values because there
+is no way to distinguish a \fBKEY_\fP value from a valid \fBwchar_t\fP value.
.SH PORTABILITY
These functions are described in The Single Unix Specification, Version 2.
No error conditions are defined.
+.PP
This implementation returns \fBERR\fP if the window pointer is null,
-or if the lower-level \fBwget_wch\fR call returns an \fBERR\fP.
+or if the lower-level \fBwget_wch\fP call returns an \fBERR\fP.
In the latter case,
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.
+and the returned array contains a \fBWEOF\fP followed by a null \fBwchar_t\fP.
.PP
-X/Open curses documented these functions to pass an array of \fBwchar_t\fR
+X/Open curses documented these functions to pass an array of \fBwchar_t\fP
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
+The effect of \fBget_wstr\fP is as though a series of calls to
+\fBget_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,
+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.
+All of the vendors implement this using \fBwint_t\fP, following the standard.
.PP
X/Open Curses, Issue 7 (2009) is unclear regarding whether
-the terminating \fInull \fP\fBwchar_t\fP
+the terminating \fInull \fBwchar_t\fR
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.
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).
+\fI\%ncurses\fP 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,
+NetBSD 7 curses imitates \fI\%ncurses\fP 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).
+\fB\%curs_getstr\fP(3X) describes comparable functions of the
+.I \%ncurses
+library in its non-wide-character configuration.
+.PP
+\fB\%curses\fP(3X),
+\fB\%curs_get_wch\fP(3X)
projects / ncurses.git / blobdiff