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-<H1 class="no-header">curs_instr 3x</H1>
+<H1 class="no-header">curs_instr 3x 2024-06-08 ncurses 6.5 Library calls</H1>
<PRE>
-<STRONG><A HREF="curs_instr.3x.html">curs_instr(3x)</A></STRONG>
<STRONG><A HREF="curs_instr.3x.html">curs_instr(3x)</A></STRONG>
+<STRONG><A HREF="curs_instr.3x.html">curs_instr(3x)</A></STRONG>
Library calls <STRONG><A HREF="curs_instr.3x.html">curs_instr(3x)</A></STRONG>
</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
<STRONG>instr</STRONG>, <STRONG>innstr</STRONG>, <STRONG>winstr</STRONG>, <STRONG>winnstr</STRONG>, <STRONG>mvinstr</STRONG>, <STRONG>mvinnstr</STRONG>, <STRONG>mvwinstr</STRONG>, <STRONG>mvwinnstr</STRONG>
- - get a string of characters from a <STRONG>curses</STRONG> window
+ - get a string from a <EM>curses</EM> window
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
- <STRONG>int</STRONG> <STRONG>instr(char</STRONG> <STRONG>*</STRONG><EM>str</EM><STRONG>);</STRONG>
- <STRONG>int</STRONG> <STRONG>innstr(char</STRONG> <STRONG>*</STRONG><EM>str</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>);</STRONG>
- <STRONG>int</STRONG> <STRONG>winstr(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>str</EM><STRONG>);</STRONG>
- <STRONG>int</STRONG> <STRONG>winnstr(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>str</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>instr(char</STRONG> <STRONG>*</STRONG> <EM>str</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>winstr(WINDOW</STRONG> <STRONG>*</STRONG> <EM>win</EM><STRONG>,</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG> <EM>str</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>mvinstr(int</STRONG> <EM>y</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>x</EM><STRONG>,</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG> <EM>str</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>mvwinstr(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>char</STRONG> <STRONG>*</STRONG> <EM>str</EM><STRONG>);</STRONG>
- <STRONG>int</STRONG> <STRONG>mvinstr(int</STRONG> <EM>y</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>x</EM><STRONG>,</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>str</EM><STRONG>);</STRONG>
- <STRONG>int</STRONG> <STRONG>mvinnstr(int</STRONG> <EM>y</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>x</EM><STRONG>,</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>str</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>);</STRONG>
- <STRONG>int</STRONG> <STRONG>mvwinstr(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>char</STRONG> <STRONG>*</STRONG><EM>str</EM><STRONG>);</STRONG>
- <STRONG>int</STRONG> <STRONG>mvwinnstr(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>char</STRONG> <STRONG>*</STRONG><EM>str</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>innstr(char</STRONG> <STRONG>*</STRONG> <EM>str</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>winnstr(WINDOW</STRONG> <STRONG>*</STRONG> <EM>win</EM><STRONG>,</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG> <EM>str</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>mvinnstr(int</STRONG> <EM>y</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>x</EM><STRONG>,</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG> <EM>str</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>mvwinnstr(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>char</STRONG> <STRONG>*</STRONG> <EM>str</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>);</STRONG>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
- These routines return a string of characters in <EM>str</EM>, extracted starting
- at the current cursor position in the named window. Attributes are
- stripped from the characters. The four functions with <EM>n</EM> as the last
- argument return a leading substring at most <EM>n</EM> characters long (exclu-
- sive of the trailing NUL).
+ <STRONG>winstr</STRONG> extracts a 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>str</EM>,
+ terminating it with a null character and omitting any attributes and
+ color pair identifier that <EM>curses</EM> associates with each character.
+ <STRONG>winnstr</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>winnstr</STRONG> then works like <STRONG>winstr</STRONG>. <STRONG><A HREF="ncurses.3x.html">ncurses(3x)</A></STRONG>
+ describes the variants of these functions.
</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
- All of the functions return <STRONG>ERR</STRONG> upon failure, or the number of charac-
- ters actually read into the string.
+ These functions return the count of characters copied from <EM>win</EM> to <EM>str</EM>,
+ or <STRONG>ERR</STRONG> upon failure.
- X/Open Curses defines no error conditions. In this implementation:
+ In <EM>ncurses</EM>, they return <STRONG>ERR</STRONG> if
- <STRONG>o</STRONG> If the <EM>win</EM> parameter is null, an error is returned,
+ <STRONG>o</STRONG> <EM>win</EM> is <STRONG>NULL</STRONG> or
- <STRONG>o</STRONG> If the <EM>chstr</EM> parameter is null, an error is returned,
+ <STRONG>o</STRONG> <EM>str</EM> is <STRONG>NULL</STRONG>.
- 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.
+ 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>
- Note that all routines except <STRONG>winnstr</STRONG> may be macros.
+ All of these functions except <STRONG>winnstr</STRONG> may be implemented as macros.
+
+ Reading a line that overflows the array pointed to by <EM>str</EM> with <STRONG>instr</STRONG>,
+ <STRONG>winstr</STRONG>, <STRONG>mvinstr</STRONG>, or <STRONG>mvwinstr</STRONG> causes undefined results. Use of <STRONG>innstr</STRONG>,
+ <STRONG>winnstr</STRONG>, <STRONG>mvinnstr</STRONG>, and <STRONG>mvwinnstr</STRONG> is recommended instead.
+
+
+</PRE><H2><a name="h2-EXTENSIONS">EXTENSIONS</a></H2><PRE>
+ <STRONG>innstr</STRONG>, <STRONG>winnstr</STRONG>, <STRONG>mvinnstr</STRONG>, and <STRONG>mvwinnstr</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>
- SVr4 does not document whether a length limit includes or excludes the
- trailing NUL.
+ 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.
+
+ X/Open Curses Issues 4 and 7 both state that <STRONG>instr</STRONG>, <STRONG>winstr</STRONG>, <STRONG>mvinstr</STRONG>,
+ and <STRONG>mvwinstr</STRONG> return <STRONG>OK</STRONG> rather than a character count. This is likely
+ an erratum.
- The ncurses library extends the XSI description by allowing a negative
- value for <EM>n</EM>. In this case, the functions return the string ending at
- the right margin.
+ <STRONG>o</STRONG> SVr3.1 and SVr4 implemented <STRONG>winstr</STRONG> as a wrapper around <STRONG>winnstr</STRONG>,
+ returning the latter's return value. X/Open Curses's specification
+ thus may have been an editorial solecism copied from System V's
+ documentation (see below) by X/Open, rather than an intentional
+ change.
+
+ <STRONG>o</STRONG> <EM>ncurses</EM> retains compatibility with System V <EM>curses</EM> behavior.
+
+ SVr4 documents no return values apart from <STRONG>OK</STRONG> and <STRONG>ERR</STRONG> for any of these
+ functions. SVr4 does not document whether <EM>n</EM> counts the null terminator
+ that these functions write to <EM>str</EM>.
+
+
+</PRE><H2><a name="h2-HISTORY">HISTORY</a></H2><PRE>
+ SVr3.1 (1987) introduced these functions.
</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
- <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>.
+ <STRONG><A HREF="curs_inwstr.3x.html">curs_inwstr(3x)</A></STRONG> describes comparable functions of the <EM>ncurses</EM> library
+ in its wide-character configuration (<EM>ncursesw</EM>).
+
+ <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_inch.3x.html">curs_inch(3x)</A></STRONG>, <STRONG><A HREF="curs_inchstr.3x.html">curs_inchstr(3x)</A></STRONG>
-
<STRONG><A HREF="curs_instr.3x.html">curs_instr(3x)</A></STRONG>
+
ncurses 6.5 2024-06-08 <STRONG><A HREF="curs_instr.3x.html">curs_instr(3x)</A></STRONG>
</PRE>
<div class="nav">
<ul>
<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-HISTORY">HISTORY</a></li>
<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
</ul>
</div>
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