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<H1 class="no-header">curs_get_wstr 3x 2024-04-20 ncurses 6.5 Library calls</H1>
<PRE>
<STRONG><A HREF="curs_get_wstr.3x.html">curs_get_wstr(3x)</A></STRONG> Library calls <STRONG><A HREF="curs_get_wstr.3x.html">curs_get_wstr(3x)</A></STRONG>
</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
<STRONG>get_wstr</STRONG>, <STRONG>getn_wstr</STRONG>, <STRONG>wget_wstr</STRONG>, <STRONG>wgetn_wstr</STRONG>, <STRONG>mvget_wstr</STRONG>, <STRONG>mvgetn_wstr</STRONG>,
<STRONG>mvwget_wstr</STRONG>, <STRONG>mvwgetn_wstr</STRONG> - get a wide-character string from a <EM>curses</EM>
terminal keyboard
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
<STRONG>int</STRONG> <STRONG>get_wstr(wint_t</STRONG> <STRONG>*</STRONG><EM>wstr</EM><STRONG>);</STRONG>
<STRONG>int</STRONG> <STRONG>getn_wstr(wint_t</STRONG> <STRONG>*</STRONG><EM>wstr</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>);</STRONG>
<STRONG>int</STRONG> <STRONG>wget_wstr(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>wint_t</STRONG> <STRONG>*</STRONG><EM>wstr</EM><STRONG>);</STRONG>
<STRONG>int</STRONG> <STRONG>wgetn_wstr(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>wint_t</STRONG> <STRONG>*</STRONG><EM>wstr</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>);</STRONG>
<STRONG>int</STRONG> <STRONG>mvget_wstr(int</STRONG> <EM>y</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>x</EM><STRONG>,</STRONG> <STRONG>wint_t</STRONG> <STRONG>*</STRONG><EM>wstr</EM><STRONG>);</STRONG>
<STRONG>int</STRONG> <STRONG>mvgetn_wstr(int</STRONG> <EM>y</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>x</EM><STRONG>,</STRONG> <STRONG>wint_t</STRONG> <STRONG>*</STRONG><EM>wstr</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>);</STRONG>
<STRONG>int</STRONG> <STRONG>mvwget_wstr(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>y</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>x</EM><STRONG>,</STRONG> <STRONG>wint_t</STRONG> <STRONG>*</STRONG><EM>wstr</EM><STRONG>);</STRONG>
<STRONG>int</STRONG> <STRONG>mvwgetn_wstr(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>y</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>x</EM><STRONG>,</STRONG> <STRONG>wint_t</STRONG> <STRONG>*</STRONG><EM>wstr</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>);</STRONG>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
The function <STRONG>wgetn_wstr</STRONG> is equivalent to a series of calls to
<STRONG><A HREF="curs_get_wch.3x.html">wget_wch(3x)</A></STRONG> until a newline or carriage return terminates the series:
<STRONG>o</STRONG> The terminating character is not included in the returned string.
<STRONG>o</STRONG> An end-of-file condition is represented by <STRONG>WEOF</STRONG>, as defined in
<STRONG><wchar.h></STRONG>.
<STRONG>o</STRONG> In all instances, the end of the string is terminated by a null
<STRONG>wchar_t</STRONG>.
<STRONG>o</STRONG> The function stores the result in the area pointed to by the <EM>wstr</EM>
parameter.
<STRONG>o</STRONG> The function reads at most <EM>n</EM> characters, thus preventing a possible
overflow of the input buffer.
Any attempt to enter more characters (other than the terminating
newline or carriage return) causes a beep.
Function keys also cause a beep and are ignored.
The user's <EM>erase</EM> and <EM>kill</EM> characters are interpreted:
<STRONG>o</STRONG> The <EM>erase</EM> character (e.g., <STRONG>^H</STRONG>) erases the character at the end of
the buffer, moving the cursor to the left.
If <EM>keypad</EM> mode is on for the window, <STRONG>KEY_LEFT</STRONG> and <STRONG>KEY_BACKSPACE</STRONG> are
both considered equivalent to the user's <EM>erase</EM> character.
<STRONG>o</STRONG> The <EM>kill</EM> character (e.g., <STRONG>^U</STRONG>) erases the entire buffer, leaving the
cursor at the beginning of the buffer.
Characters input are echoed only if <STRONG>echo</STRONG> is currently on. In that
case, backspace is echoed as deletion of the previous character
(typically a left motion).
The <STRONG>getn_wstr</STRONG>, <STRONG>mvgetn_wstr</STRONG>, <STRONG>mvwgetn_wstr</STRONG>, and <STRONG>wgetn_wstr</STRONG> functions are
identical to the <STRONG>get_wstr</STRONG>, <STRONG>mvget_wstr</STRONG>, <STRONG>mvwget_wstr</STRONG>, and <STRONG>wget_wstr</STRONG>
functions, respectively, except that the <STRONG>*n_*</STRONG> versions read at most <EM>n</EM>
characters, letting the application prevent overflow of the input
buffer.
</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
All of these functions return the integer <STRONG>OK</STRONG> upon successful
completion. If unsuccessful, they return <STRONG>ERR</STRONG>.
X/Open defines no error conditions.
In this implementation, these functions return an error
<STRONG>o</STRONG> if the window pointer is null,
<STRONG>o</STRONG> if its timeout expires without having any data, or
<STRONG>o</STRONG> if the associated call to <STRONG>wget_wch</STRONG> failed.
Functions prefixed with "mv" first perform cursor movement and fail if
the position (<EM>y</EM>, <EM>x</EM>) is outside the window boundaries.
</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
Any of these functions other than <STRONG>wgetn_wstr</STRONG> may be macros.
Using <STRONG>get_wstr</STRONG>, <STRONG>mvget_wstr</STRONG>, <STRONG>mvwget_wstr</STRONG>, or <STRONG>wget_wstr</STRONG> to read a line
that overflows the array pointed to by <STRONG>wstr</STRONG> causes undefined results.
The use of <STRONG>getn_wstr</STRONG>, <STRONG>mvgetn_wstr</STRONG>, <STRONG>mvwgetn_wstr</STRONG>, or <STRONG>wgetn_wstr</STRONG>,
respectively, is recommended.
These functions cannot return <STRONG>KEY_</STRONG> values because there is no way to
distinguish a <STRONG>KEY_</STRONG> value from a valid <STRONG>wchar_t</STRONG> value.
</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
These functions are described in The Single Unix Specification, Version
2. No error conditions are defined.
This implementation returns <STRONG>ERR</STRONG> if the window pointer is null, or if
the lower-level <STRONG>wget_wch</STRONG> call returns an <STRONG>ERR</STRONG>. In the latter case, an
<STRONG>ERR</STRONG> return without other data is treated as an end-of-file condition,
and the returned array contains a <STRONG>WEOF</STRONG> followed by a null <STRONG>wchar_t</STRONG>.
X/Open curses documented these functions to pass an array of <STRONG>wchar_t</STRONG> in
1997, but that was an error because of this part of the description:
The effect of <STRONG>get_wstr</STRONG> is as though a series of calls to <STRONG>get_wch</STRONG>
were made, until a newline character, end-of-line character, or
end-of-file character is processed.
The latter function <EM>get</EM><STRONG>_</STRONG><EM>wch</EM> can return a negative value, while <STRONG>wchar_t</STRONG>
is a unsigned type. All of the vendors implement this using <STRONG>wint_t</STRONG>,
following the standard.
X/Open Curses, Issue 7 (2009) is unclear regarding whether the
terminating <EM>null</EM> <STRONG>wchar_t</STRONG> value is counted in the length parameter <EM>n</EM>.
X/Open Curses, Issue 7 revised the corresponding description of
<STRONG>wgetnstr</STRONG> to address this issue. The unrevised description of
<STRONG>wget_nwstr</STRONG> can be interpreted either way. This implementation counts
the terminator in the length.
X/Open Curses does not specify what happens if the length <EM>n</EM> is
negative.
<STRONG>o</STRONG> For analogy with <STRONG>wgetnstr</STRONG>, <EM>ncurses</EM> 6.2 uses a limit (based on
<STRONG>LINE_MAX</STRONG>).
<STRONG>o</STRONG> Some other implementations (such as Solaris xcurses) do the same,
while others (PDCurses) do not allow this.
<STRONG>o</STRONG> NetBSD 7 curses imitates <EM>ncurses</EM> 6.1 in this regard, treating a <STRONG>-1</STRONG>
as an indefinite number of characters.
</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
<STRONG><A HREF="curs_getstr.3x.html">curs_getstr(3x)</A></STRONG> describes comparable functions of the <EM>ncurses</EM> library
in its non-wide-character configuration.
<STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_get_wch.3x.html">curs_get_wch(3x)</A></STRONG>
ncurses 6.5 2024-04-20 <STRONG><A HREF="curs_get_wstr.3x.html">curs_get_wstr(3x)</A></STRONG>
</PRE>
<div class="nav">
<ul>
<li><a href="#h2-NAME">NAME</a></li>
<li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
<li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
<li><a href="#h2-NOTES">NOTES</a></li>
<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
</ul>
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