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- * @Id: curs_get_wstr.3x,v 1.30 2023/08/05 12:14:30 tom Exp @
+ * @Id: curs_get_wstr.3x,v 1.34 2023/09/16 23:34:43 tom Exp @
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-<H1 class="no-header">curs_get_wstr 3x 2023-08-05 ncurses 6.4 Library calls</H1>
+<H1 class="no-header">curs_get_wstr 3x 2023-09-16 ncurses 6.4 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 an array of wide characters from a
- curses terminal keyboard
+ <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>
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 (typi-
- cally a left motion).
+ 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> func-
- tions, respectively, except that the <STRONG>*n_*</STRONG> versions read at most <EM>n</EM> char-
- acters, letting the application prevent overflow of the input buffer.
+ 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-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>, respec-
- tively, is recommended.
+ 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
+ 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. may be macros.
</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
- All of these functions return the integer <STRONG>OK</STRONG> upon successful comple-
- tion. If unsuccessful, they return <STRONG>ERR</STRONG>.
+ 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.
<STRONG>o</STRONG> if the associated call to <STRONG>wget_wch</STRONG> failed.
- Functions with a "mv" prefix first perform a cursor movement using
+ Functions with a "mv" prefix first perform a cursor movement using
<STRONG>wmove</STRONG>, and return an error if the position is outside the window, or if
the window pointer is null.
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,
+ 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
+ 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>,
+ 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 termi-
- nating <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 in-
- terpreted either way. This implementation counts the terminator in the
- length.
+ 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 nega-
- tive.
+ 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>, ncurses 6.2 uses a limit (based on
+ <STRONG>o</STRONG> For analogy with <STRONG>wgetnstr</STRONG>, ncurses 6.2 uses a limit (based on
<STRONG>LINE_MAX</STRONG>).
- <STRONG>o</STRONG> Some other implementations (such as Solaris xcurses) do the same,
+ <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 ncurses 6.1 in this regard, treating a <STRONG>-1</STRONG>
+ <STRONG>o</STRONG> NetBSD 7 curses imitates ncurses 6.1 in this regard, treating a <STRONG>-1</STRONG>
as an indefinite number of characters.
-ncurses 6.4 2023-0
8-05 <STRONG><A HREF="curs_get_wstr.3x.html">curs_get_wstr(3x)</A></STRONG>
+ncurses 6.4 2023-0
9-16 <STRONG><A HREF="curs_get_wstr.3x.html">curs_get_wstr(3x)</A></STRONG>
</PRE>
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