-<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
-<!--
+<!--
****************************************************************************
- * Copyright (c) 2002-2010,2012 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 *
* sale, use or other dealings in this Software without prior written *
* authorization. *
****************************************************************************
- * @Id: curs_inwstr.3x,v 1.8 2012/11/03 23:03:59 tom Exp @
+ * @Id: curs_inwstr.3x,v 1.45 2024/06/08 21:19:18 tom Exp @
-->
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
<HTML>
<HEAD>
-<TITLE>curs_inwstr 3x</TITLE>
-<link rev=made href="mailto:bug-ncurses@gnu.org">
-<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
+<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
+<meta name="generator" content="Manpage converted by man2html - see https://invisible-island.net/scripts/readme.html#others_scripts">
+<TITLE>curs_inwstr 3x 2024-06-08 ncurses 6.5 Library calls</TITLE>
+<link rel="author" href="mailto:bug-ncurses@gnu.org">
+
</HEAD>
<BODY>
-<H1>curs_inwstr 3x</H1>
-<HR>
+<H1 class="no-header">curs_inwstr 3x 2024-06-08 ncurses 6.5 Library calls</H1>
<PRE>
-<!-- Manpage converted by man2html 3.0.1 -->
-<STRONG><A HREF="curs_inwstr.3x.html">curs_inwstr(3x)</A></STRONG> <STRONG><A HREF="curs_inwstr.3x.html">curs_inwstr(3x)</A></STRONG>
+<STRONG><A HREF="curs_inwstr.3x.html">curs_inwstr(3x)</A></STRONG> Library calls <STRONG><A HREF="curs_inwstr.3x.html">curs_inwstr(3x)</A></STRONG>
-</PRE>
-<H2>NAME</H2><PRE>
- <STRONG>inwstr</STRONG>, <STRONG>innwstr</STRONG>, <STRONG>winwstr</STRONG>, <STRONG>winnwstr</STRONG>, <STRONG>mvinwstr</STRONG>, <STRONG>mvinnwstr</STRONG>,
- <STRONG>mvwinwstr</STRONG>, <STRONG>mvwinnwstr</STRONG> - get a string of <STRONG>wchar_t</STRONG> characters
- from a curses window
+</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
+ <STRONG>inwstr</STRONG>, <STRONG>innwstr</STRONG>, <STRONG>winwstr</STRONG>, <STRONG>winnwstr</STRONG>, <STRONG>mvinwstr</STRONG>, <STRONG>mvinnwstr</STRONG>, <STRONG>mvwinwstr</STRONG>,
+ <STRONG>mvwinnwstr</STRONG> - get a wide-character string from a <EM>curses</EM> window
-</PRE>
-<H2>SYNOPSIS</H2><PRE>
+</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
- <STRONG>int</STRONG> <STRONG>inwstr(wchar_t</STRONG> <STRONG>*</STRONG><EM>str</EM><STRONG>);</STRONG>
- <STRONG>int</STRONG> <STRONG>innwstr(wchar_t</STRONG> <STRONG>*</STRONG><EM>str</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>);</STRONG>
- <STRONG>int</STRONG> <STRONG>winwstr(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>wchar_t</STRONG> <STRONG>*</STRONG><EM>str</EM><STRONG>);</STRONG>
- <STRONG>int</STRONG> <STRONG>winnwstr(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>wchar_t</STRONG> <STRONG>*</STRONG><EM>str</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>);</STRONG>
- <STRONG>int</STRONG> <STRONG>mvinwstr(int</STRONG> <EM>y</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>x</EM><STRONG>,</STRONG> <STRONG>wchar_t</STRONG> <STRONG>*</STRONG><EM>str</EM><STRONG>);</STRONG>
- <STRONG>int</STRONG> <STRONG>mvinnwstr(int</STRONG> <EM>y</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>x</EM><STRONG>,</STRONG> <STRONG>wchar_t</STRONG> <STRONG>*</STRONG><EM>str</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>);</STRONG>
- <STRONG>int</STRONG> <STRONG>mvwinwstr(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>wchar_t</STRONG> <STRONG>*</STRONG><EM>str</EM><STRONG>);</STRONG>
- <STRONG>int</STRONG> <STRONG>mvwinnwstr(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>wchar_t</STRONG> <STRONG>*</STRONG><EM>str</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>inwstr(wchar_t</STRONG> <STRONG>*</STRONG> <EM>wstr</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>winwstr(WINDOW</STRONG> <STRONG>*</STRONG> <EM>win</EM><STRONG>,</STRONG> <STRONG>wchar_t</STRONG> <STRONG>*</STRONG> <EM>wstr</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>mvinwstr(int</STRONG> <EM>y</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>x</EM><STRONG>,</STRONG> <STRONG>wchar_t</STRONG> <STRONG>*</STRONG> <EM>wstr</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>mvwinwstr(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>wchar_t</STRONG> <STRONG>*</STRONG> <EM>wstr</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>innwstr(wchar_t</STRONG> <STRONG>*</STRONG> <EM>wstr</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>winnwstr(WINDOW</STRONG> <STRONG>*</STRONG> <EM>win</EM><STRONG>,</STRONG> <STRONG>wchar_t</STRONG> <STRONG>*</STRONG> <EM>wstr</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>mvinnwstr(int</STRONG> <EM>y</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>x</EM><STRONG>,</STRONG> <STRONG>wchar_t</STRONG> <STRONG>*</STRONG> <EM>wstr</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>mvwinnwstr(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>wchar_t</STRONG> <STRONG>*</STRONG> <EM>wstr</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>);</STRONG>
-</PRE>
-<H2>DESCRIPTION</H2><PRE>
- These routines return a string of <STRONG>wchar_t</STRONG> characters in
- <EM>wstr</EM>, extracted starting at the current cursor position in
- the named window. Attributes are stripped from the char-
- acters. The four functions with <EM>n</EM> as the last argument
- return a leading substring at most <EM>n</EM> bytes long (exclusive
- of the trailing NUL). Transfer stops at the end of the
- current line, or when <EM>n</EM> bytes have been stored at the
- location referenced by <EM>wstr</EM>.
- If the size <EM>n</EM> is not large enough to store a complete
- character, an error is generated.
+</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
+ <STRONG>winwstr</STRONG> extracts a wide-character string from a <EM>curses</EM> window <EM>win</EM>,
+ starting at the cursor and stopping at the end of the line, and stores
+ it in <EM>wstr</EM>, terminating it with a wide null character and omitting any
+ attributes and color pair identifier that <EM>curses</EM> associates with each
+ character. <STRONG>winnwstr</STRONG> does the same, but copies at most <EM>n</EM> characters
+ from <EM>win</EM>. An <EM>n</EM> of <STRONG>-1</STRONG> implies no limit; <STRONG>winnwstr</STRONG> then works like
+ <STRONG>winwstr</STRONG>. <STRONG><A HREF="ncurses.3x.html">ncurses(3x)</A></STRONG> describes the variants of these functions.
-</PRE>
-<H2>NOTES</H2><PRE>
- Note that all routines except <STRONG>winnwstr</STRONG> may be macros.
+</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
+ On successful operation, these functions return the count of wide
+ characters copied from <EM>win</EM> to <EM>wstr</EM>. They return <STRONG>ERR</STRONG> upon failure.
+ <STRONG>innwstr</STRONG>, <STRONG>winnwstr</STRONG>, <STRONG>mvinnwstr</STRONG>, and <STRONG>mvwinnwstr</STRONG> return <STRONG>ERR</STRONG> if <EM>n</EM> is
+ insufficiently large to store a complete wide character string.
+ (Recall that a <EM>curses</EM> complex character can contain multiple wide
+ characters, some of which may be non-spacing.)
+ In <EM>ncurses</EM>, these functions return <STRONG>ERR</STRONG> if
-</PRE>
-<H2>RETURN VALUE</H2><PRE>
- All routines return <STRONG>ERR</STRONG> upon failure. Upon successful com-
- pletion, the *<STRONG>inwstr</STRONG> routines return <STRONG>OK</STRONG>, and the *<STRONG>innwstr</STRONG>
- routines return the number of characters read into the
- string.
+ <STRONG>o</STRONG> <EM>win</EM> is <STRONG>NULL</STRONG> or
- Functions with a "mv" prefix first perform a cursor move-
- ment using <STRONG>wmove</STRONG>, and return an error if the position is
- outside the window, or if the window pointer is null.
+ <STRONG>o</STRONG> <EM>wstr</EM> is <STRONG>NULL</STRONG>.
+ 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>SEE ALSO</H2><PRE>
- <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_instr.3x.html">curs_instr(3x)</A></STRONG>, <STRONG><A HREF="curs_in_wchstr.3x.html">curs_in_wchstr(3x)</A></STRONG>
+
+</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
+ All of these functions except <STRONG>winnwstr</STRONG> may be implemented as macros.
+
+ Reading a line that overflows the array pointed to by <EM>str</EM> with <STRONG>inwstr</STRONG>,
+ <STRONG>winwstr</STRONG>, <STRONG>mvinwstr</STRONG>, or <STRONG>mvwinwstr</STRONG> causes undefined results. Use of
+ <STRONG>innwstr</STRONG>, <STRONG>winnwstr</STRONG>, <STRONG>mvinnwstr</STRONG>, and <STRONG>mvwinnwstr</STRONG> is recommended instead.
+
+
+</PRE><H2><a name="h2-EXTENSIONS">EXTENSIONS</a></H2><PRE>
+ <STRONG>innwstr</STRONG>, <STRONG>winnwstr</STRONG>, <STRONG>mvinnwstr</STRONG>, and <STRONG>mvwinnwstr</STRONG>'s treatment of <STRONG>-1</STRONG> as a
+ valid value of <EM>n</EM> is an <EM>ncurses</EM> extension.
+
+
+</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
+ Applications employing <EM>ncurses</EM> extensions should condition their use on
+ the visibility of the <STRONG>NCURSES_VERSION</STRONG> preprocessor macro.
+
+ X/Open Curses, Issue 4 describes these functions. It specifies no
+ error conditions for them.
+
+ Notwithstanding the foregoing, X/Open Curses Issues 4 and 7 both state
+ that <STRONG>innwstr</STRONG>, <STRONG>winnwstr</STRONG>, <STRONG>mvinnwstr</STRONG>, and <STRONG>mvwinnwstr</STRONG> "fail ... [i]f the
+ array is not large enough to contain any complete characters".
+ Strictly interpreted, this means that a caller of these functions
+ cannot use their return values to detect truncation of a wide-character
+ string copied from more than one character cell in <EM>win</EM>. <EM>ncurses</EM>
+ reports any truncation with <STRONG>ERR</STRONG>.
+
+ X/Open Curses specifies <STRONG>inwstr</STRONG>, <STRONG>winwstr</STRONG>, <STRONG>mvinwstr</STRONG>, and <STRONG>mvwinwstr</STRONG> as
+ returning <STRONG>OK</STRONG> rather than a (wide) character count, unlike their non-
+ wide counterparts <STRONG>instr</STRONG>, <STRONG>winstr</STRONG>, <STRONG>mvinstr</STRONG>, and <STRONG>mvwinstr</STRONG>. <EM>ncurses</EM>
+ regards this inconsistency as an error in the standard.
+
+
+</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
+ <STRONG><A HREF="curs_instr.3x.html">curs_instr(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_in_wch.3x.html">curs_in_wch(3x)</A></STRONG>, <STRONG><A HREF="curs_in_wchstr.3x.html">curs_in_wchstr(3x)</A></STRONG>
-
<STRONG><A HREF="curs_inwstr.3x.html">curs_inwstr(3x)</A></STRONG>
+
ncurses 6.5 2024-06-08 <STRONG><A HREF="curs_inwstr.3x.html">curs_inwstr(3x)</A></STRONG>
</PRE>
-<HR>
-<ADDRESS>
-Man(1) output converted with
-<a href="http://www.oac.uci.edu/indiv/ehood/man2html.html">man2html</a>
-</ADDRESS>
+<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-EXTENSIONS">EXTENSIONS</a></li>
+<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
+<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
+</ul>
+</div>
</BODY>
</HTML>
projects / ncurses.git / blobdiff