220 lines
7.7 KiB
Plaintext
220 lines
7.7 KiB
Plaintext
.\"***************************************************************************
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.\" Copyright 2018-2019,2020 Thomas E. Dickey *
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.\" Copyright 2002-2012,2017 Free Software Foundation, Inc. *
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.\" *
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.\" Permission is hereby granted, free of charge, to any person obtaining a *
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.\" copy of this software and associated documentation files (the *
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.\" "Software"), to deal in the Software without restriction, including *
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.\" without limitation the rights to use, copy, modify, merge, publish, *
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.\" distribute, distribute with modifications, sublicense, and/or sell *
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.\" copies of the Software, and to permit persons to whom the Software is *
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.\" furnished to do so, subject to the following conditions: *
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.\" *
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.\" The above copyright notice and this permission notice shall be included *
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.\" in all copies or substantial portions of the Software. *
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.\" *
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
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.\" IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
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.\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
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.\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
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.\" THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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.\" *
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.\" Except as contained in this notice, the name(s) of the above copyright *
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.\" holders shall not be used in advertising or otherwise to promote the *
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.\" sale, use or other dealings in this Software without prior written *
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.\" authorization. *
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.\"***************************************************************************
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.\"
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.\" $Id: curs_get_wstr.3x,v 1.21 2020/10/17 23:17:24 tom Exp $
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.TH curs_get_wstr 3X ""
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.ie \n(.g .ds `` \(lq
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.el .ds `` ``
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.ie \n(.g .ds '' \(rq
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.el .ds '' ''
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.de bP
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.ie n .IP \(bu 4
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.el .IP \(bu 2
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..
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.na
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.hy 0
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.SH NAME
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\fBget_wstr\fR,
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\fBgetn_wstr\fR,
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\fBwget_wstr\fR,
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\fBwgetn_wstr\fR,
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\fBmvget_wstr\fR,
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\fBmvgetn_wstr\fR,
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\fBmvwget_wstr\fR,
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\fBmvwgetn_wstr\fR \- get an array of wide characters from a curses terminal keyboard
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.ad
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.hy
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.SH SYNOPSIS
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.nf
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\fB#include <curses.h>\fR
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.sp
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\fBint get_wstr(wint_t *\fR\fIwstr\fR\fB);\fR
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.br
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\fBint getn_wstr(wint_t *\fR\fIwstr\fR\fB, int \fR\fIn\fR\fB);\fR
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.br
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\fBint wget_wstr(WINDOW *\fR\fIwin\fR\fB, wint_t *\fR\fIwstr\fR\fB);\fR
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.br
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\fBint wgetn_wstr(WINDOW *\fR\fIwin\fR\fB, wint_t *\fR\fIwstr\fR\fB, int \fR\fIn\fR\fB);\fR
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.sp
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\fBint mvget_wstr(int \fR\fIy\fR\fB, int \fR\fIx\fR\fB, wint_t *\fR\fIwstr\fR\fB);\fR
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.br
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\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
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.br
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\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
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.br
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\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
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.fi
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.SH DESCRIPTION
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The effect of
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\fBget_wstr\fR
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is as though a series of calls
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to
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\fBget_wch\fR(3X)
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were made, until a newline, other end-of-line,
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or end-of-file condition is processed.
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An end-of-file condition is represented by \fBWEOF\fR,
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as defined in \fB<wchar.h>\fR.
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The newline and end-of-line conditions are represented
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by the \fB\\n\fR \fBwchar_t\fR value.
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In all instances, the end of the string is terminated by a null \fBwchar_t\fR.
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The routine places resulting values in the area pointed to by \fIwstr\fR.
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.PP
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The user's erase and kill characters are interpreted.
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If keypad
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mode is on for the window, \fBKEY_LEFT\fR and \fBKEY_BACKSPACE\fR
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are both considered equivalent to the user's kill character.
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.PP
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Characters input are echoed only if \fBecho\fR is currently on.
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In that case,
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backspace is echoed as deletion of the previous character (typically a left
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motion).
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.PP
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The effect of
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\fBwget_wstr\fR
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is as though a series of
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calls to
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\fBwget_wch\fR
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were made.
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.PP
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The effect of
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\fBmvget_wstr\fR
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is as though a call to
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\fBmove\fR
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and then a series of calls to
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\fBget_wch\fR
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were
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made.
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.PP
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The effect of
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\fBmvwget_wstr\fR
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is as though a call to
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\fBwmove\fR
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and then a series of calls to
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\fBwget_wch\fR
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were made.
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.PP
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The
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\fBgetn_wstr\fR,
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\fBmvgetn_wstr\fR,
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\fBmvwgetn_wstr\fR, and
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\fBwgetn_wstr\fR
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functions are identical
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to the
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\fBget_wstr\fR,
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\fBmvget_wstr\fR,
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\fBmvwget_wstr\fR, and
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\fBwget_wstr\fR
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functions, respectively,
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except that the
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\fB*n_*\fR
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versions read at most
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\fIn\fR
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characters, letting the application prevent overflow of the
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input buffer.
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.SH NOTES
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Using
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\fBget_wstr\fR,
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\fBmvget_wstr\fR,
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\fBmvwget_wstr\fR, or
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\fBwget_wstr\fR
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to read a line that
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overflows the array pointed to by
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\fBwstr\fR
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causes undefined
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results.
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The use of
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\fBgetn_wstr\fR,
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\fBmvgetn_wstr\fR,
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\fBmvwgetn_wstr\fR, or
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\fBwgetn_wstr\fR, respectively, is recommended.
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.PP
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These functions cannot return \fBKEY_\fR values because there
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is no way to distinguish a \fBKEY_\fR value from a valid \fBwchar_t\fR value.
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.PP
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All of these routines except \fBwgetn_wstr\fR may be macros.
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.SH RETURN VALUE
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All of these functions return \fBOK\fR upon successful completion.
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Otherwise, they return \fBERR\fR.
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.PP
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Functions using a window parameter return an error if it is null.
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.RS
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.TP 5
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\fBwgetn_wstr\fP
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returns an error if the associated call to \fBwget_wch\fP failed.
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.RE
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.PP
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Functions with a \*(``mv\*('' prefix first perform a cursor movement using
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\fBwmove\fP, and return an error if the position is outside the window,
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or if the window pointer is null.
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.SH PORTABILITY
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These functions are described in The Single Unix Specification, Version 2.
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No error conditions are defined.
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This implementation returns \fBERR\fP if the window pointer is null,
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or if the lower-level \fBwget_wch\fR call returns an \fBERR\fP.
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In the latter case,
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an \fBERR\fP return without other data is treated as an end-of-file condition,
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and the returned array contains a \fBWEOF\fR followed by a null \fBwchar_t\fR.
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.PP
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X/Open curses documented these functions to pass an array of \fBwchar_t\fR
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in 1997, but that was an error because of this part of the description:
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.RS
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.PP
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The effect of \fIget_wstr()\fP is as though a series of calls to
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\fIget_wch()\fP were made, until a newline character, end-of-line character, or
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end-of-file character is processed.
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.RE
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.PP
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The latter function \fIget_wch()\fP can return a negative value,
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while \fBwchar_t\fP is a unsigned type.
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All of the vendors implement this using \fBwint_t\fR, following the standard.
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.PP
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X/Open Curses, Issue 7 (2009) is unclear regarding whether
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the terminating \fInull \fP\fBwchar_t\fP
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value is counted in the length parameter \fIn\fP.
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X/Open Curses, Issue 7 revised the corresponding description
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of \fBwgetnstr\fP to address this issue.
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The unrevised description of \fBwget_nwstr\fP can be interpreted either way.
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This implementation counts the terminator in the length.
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.PP
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X/Open Curses does not specify what happens if the length \fIn\fP is negative.
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.bP
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For analogy with \fBwgetnstr\fP,
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ncurses 6.2 uses a limit (based on \fBLINE_MAX\fP).
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.bP
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Some other implementations (such as Solaris xcurses) do the same,
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while others (PDCurses) do not allow this.
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.bP
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NetBSD 7 curses imitates ncurses 6.1 in this regard,
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treating a \fB\-1\fP as an indefinite number of characters.
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.SH SEE ALSO
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Functions:
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\fBcurses\fR(3X),
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\fBcurs_get_wch\fR(3X),
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\fBcurs_getstr\fR(3X).
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