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-<H1 class="no-header">curs_scanw 3X</H1>
+<H1 class="no-header">curs_scanw 3x 2024-04-20 ncurses 6.4 Library calls</H1>
<PRE>
-<B><A HREF="curs_scanw.3X.html">curs_scanw(3X)</A></B> <B><A HREF="curs_scanw.3X.html">curs_scanw(3X)</A></B>
+<STRONG><A HREF="curs_scanw.3x.html">curs_scanw(3x)</A></STRONG> Library calls <STRONG><A HREF="curs_scanw.3x.html">curs_scanw(3x)</A></STRONG>
</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
- <B>scanw</B>, <B>wscanw</B>, <B>mvscanw</B>, <B>mvwscanw</B>, <B>vwscanw</B>, <B>vw_scanw</B> - convert formatted
- input from a <B>curses</B> window
+ <STRONG>scanw</STRONG>, <STRONG>wscanw</STRONG>, <STRONG>mvscanw</STRONG>, <STRONG>mvwscanw</STRONG>, <STRONG>vwscanw</STRONG>, <STRONG>vw_scanw</STRONG> - read formatted
+ input from a <EM>curses</EM> window
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
- <B>#include</B> <B><curses.h></B>
+ <STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
- <B>int</B> <B>scanw(const</B> <B>char</B> <B>*</B><I>fmt</I><B>,</B> <B>...);</B>
- <B>int</B> <B>wscanw(WINDOW</B> <B>*</B><I>win</I><B>,</B> <B>const</B> <B>char</B> <B>*</B><I>fmt</I><B>,</B> <B>...);</B>
- <B>int</B> <B>mvscanw(int</B> <I>y</I><B>,</B> <B>int</B> <I>x</I><B>,</B> <B>const</B> <B>char</B> <B>*</B><I>fmt</I><B>,</B> <B>...);</B>
- <B>int</B> <B>mvwscanw(WINDOW</B> <B>*</B><I>win</I><B>,</B> <B>int</B> <I>y</I><B>,</B> <B>int</B> <I>x</I><B>,</B> <B>const</B> <B>char</B> <B>*</B><I>fmt</I><B>,</B> <B>...);</B>
+ <STRONG>int</STRONG> <STRONG>scanw(const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>fmt</EM><STRONG>,</STRONG> <STRONG>...);</STRONG>
+ <STRONG>int</STRONG> <STRONG>wscanw(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>fmt</EM><STRONG>,</STRONG> <STRONG>...);</STRONG>
+ <STRONG>int</STRONG> <STRONG>mvscanw(int</STRONG> <EM>y</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>x</EM><STRONG>,</STRONG> <STRONG>const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>fmt</EM><STRONG>,</STRONG> <STRONG>...);</STRONG>
+ <STRONG>int</STRONG> <STRONG>mvwscanw(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>const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>fmt</EM><STRONG>,</STRONG> <STRONG>...);</STRONG>
- <B>int</B> <B>vw_scanw(WINDOW</B> <B>*</B><I>win</I><B>,</B> <B>const</B> <B>char</B> <B>*</B><I>fmt</I><B>,</B> <B>va_list</B> <I>varglist</I><B>);</B>
+ <STRONG>int</STRONG> <STRONG>vw_scanw(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>fmt</EM><STRONG>,</STRONG> <STRONG>va_list</STRONG> <EM>varglist</EM><STRONG>);</STRONG>
- /* obsolete */
- <B>int</B> <B>vwscanw(WINDOW</B> <B>*</B><I>win</I><B>,</B> <B>const</B> <B>char</B> <B>*</B><I>fmt</I><B>,</B> <B>va_list</B> <I>varglist</I><B>);</B>
+ <EM>/*</EM> <EM>obsolete</EM> <EM>*/</EM>
+ <STRONG>int</STRONG> <STRONG>vwscanw(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>fmt</EM><STRONG>,</STRONG> <STRONG>va_list</STRONG> <EM>varglist</EM><STRONG>);</STRONG>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
- The <B>scanw</B>, <B>wscanw</B> and <B>mvscanw</B> routines are analogous to <B>scanf</B> [see
- <B>scanf(3)</B>]. The effect of these routines is as though <B>wgetstr</B> were
- called on the window, and the resulting line used as input for
- <B>sscanf(3)</B>. Fields which do not map to a variable in the <I>fmt</I> field are
- lost.
+ <STRONG>scanw</STRONG>, <STRONG>wscanw</STRONG>, <STRONG>mvscanw</STRONG>, and <STRONG>mvwscanw</STRONG> are analogous to <STRONG>scanf(3)</STRONG>. In
+ effect, they call <STRONG><A HREF="curs_getstr.3x.html">wgetstr(3x)</A></STRONG> with <EM>win</EM> (or <STRONG>stdscr</STRONG>) as its first
+ argument, then attempt conversion of the resulting string with
+ <STRONG>vsscanf(3)</STRONG>. Fields in the string that do not map to a variable in the
+ <EM>fmt</EM> parameter are discarded.
- The <B>vwscanw</B> and <B>vw_scanw</B> routines are analogous to <B>vscanf(3)</B>. They
- perform a <B>wscanw</B> using a variable argument list. The third argument is
- a <I>va</I><B>_</B><I>list</I>, a pointer to a list of arguments, as defined in <B><stdarg.h></B>.
+ <STRONG>vwscanw</STRONG> and <STRONG>vw_scanw</STRONG> are analogous to <STRONG>vscanf(3)</STRONG>, and perform a <STRONG>wscanw</STRONG>
+ using a variable argument list. The third argument is a <EM>va</EM><STRONG>_</STRONG><EM>list</EM>, a
+ pointer to a list of arguments, as defined in <EM>stdarg.h</EM>.
</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
- <B>vwscanw</B> returns <B>ERR</B> on failure and an integer equal to the number of
- fields scanned on success.
+ These functions return <STRONG>ERR</STRONG> upon failure and otherwise a count of
+ successful conversions; this quantity may be zero.
- Applications may use the return value from the <B>scanw</B>, <B>wscanw</B>, <B>mvscanw</B>
- and <B>mvwscanw</B> routines to determine the number of fields which were
- mapped in the call.
+ In <EM>ncurses</EM>, failure occurs if <STRONG>vsscanf(3)</STRONG> returns <STRONG>EOF</STRONG>, or if the window
+ pointer <EM>win</EM> is null.
- Functions with a "mv" prefix first perform a cursor movement using
- <B>wmove</B>, 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-HISTORY">HISTORY</a></H2><PRE>
- While <B>scanw</B> was implemented in 4BSD, none of the BSD releases used it
- until 4.4BSD (in a game). That early version of curses was before the
- ANSI C standard. It did not use <varargs.h>, though that was
- available. In 1991 (a couple of years after SVr4 was generally
- available, and after the C standard was published), other developers
- updated the library, using <stdarg.h> internally in 4.4BSD curses.
- Even with this improvement, BSD curses did not use function prototypes
- (or even declare functions) in the <curses.h> header until 1992.
-
- SVr2 documented <B>scanw</B>, <B>wscanw</B> tersely as "scanf through <I>stdscr</I>" and
- tersely as "scanf through <I>win</I>", respectively.
-
- SVr3 added <B>mvscanw</B>, and <B>mvwscanw</B>, with a three-line summary saying that
- they were analogous to <B>scanf(3)</B>, explaining that the string which would
- be output from <B>scanf(3)</B> would instead be output using <B>waddstr</B> on the
- given window. SVr3 also added <B>vwscanw</B>, saying that the third parameter
- is a <B>va_list</B>, defined in <varargs.h>, and referring the reader to the
- manual pages for <I>varargs</I> and <I>vprintf</I> for detailed descriptions.
- (Because the SVr3 documentation does not mention <I>vscanf</I>, that reference
- to <I>vprintf</I> may not be an error).
-
- SVr4 added no new variations of <B>scanw</B>, but provided for using
- <varargs.h> or <stdarg.h> to define the <B>va_list</B> type.
-
- X/Open Curses added <B>vw_scanw</B> to replace <B>vwscanw</B>, stating that its
- <B>va_list</B> definition requires <stdarg.h>.
+</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
+ No wide character counterpart functions are defined by the "wide"
+ <EM>ncurses</EM> configuration nor by any standard. They are unnecessary: to
+ retrieve and convert a wide-character string from a <EM>curses</EM> terminal
+ keyboard, use these functions with the <STRONG>scanf(3)</STRONG> conversions "%lc" and
+ "%ls" for wide characters and strings, respectively.
+
+ <EM>ncurses</EM> implements <STRONG>vsscanf(3)</STRONG> internally if it is unavailable when the
+ library is configured.
</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
- In this implementation, <B>vw_scanw</B> and <B>vwscanw</B> are equivalent, to support
- legacy applications. However, the latter (<B>vwscanw</B>) is obsolete:
+ X/Open Curses, Issue 4 describes these functions. It specifies no
+ error conditions for them.
+
+ <EM>ncurses</EM> defines <STRONG>vw_scanw</STRONG> and <STRONG>vwscanw</STRONG> identically to support legacy
+ applications. However, the latter is obsolete.
- <B>o</B> The XSI Curses standard, Issue 4 described these functions, noting
- that the function <B>vwscanw</B> is marked TO BE WITHDRAWN, and is to be
- replaced by a function <B>vw_scanw</B> using the <B><stdarg.h></B> interface.
+ <STRONG>o</STRONG> X/Open Curses, Issue 4 Version 2 (1996), marked <STRONG>vwscanw</STRONG> as
+ requiring <EM>varargs.h</EM> and "TO BE WITHDRAWN", and specified <STRONG>vw_scanw</STRONG>
+ using the <EM>stdarg.h</EM> interface.
- <B>o</B> The Single Unix Specification, Version 2 states that <B>vw_scanw</B> is
- preferred to <B>vwscanw</B> since the latter requires including
- <B><varargs.h></B>, which cannot be used in the same file as <B><stdarg.h></B>.
- This implementation uses <B><stdarg.h></B> for both, because that header
- is included in <B><curses.h</B>>.
+ <STRONG>o</STRONG> X/Open Curses, Issue 5, Draft 2 (December 2007) marked <STRONG>vwscanw</STRONG>
+ (along with <STRONG>vwscanw</STRONG> and the <EM>termcap</EM> interface) as withdrawn. After
+ incorporating review comments, this became X/Open Curses, Issue 7
+ (2009).
- <B>o</B> X/Open Curses, Issue 5 (December 2007) marked <B>vwscanw</B> (along with
- <B>vwprintw</B> and the termcap interface) as withdrawn.
+ <STRONG>o</STRONG> <EM>ncurses</EM> provides <STRONG>vwscanw</STRONG>, but marks it as deprecated.
- Both XSI and The Single Unix Specification, Version 2 state that these
- functions return <B>ERR</B> or <B>OK</B>.
+ X/Open Curses Issues 4 and 7 both state that these functions return <STRONG>ERR</STRONG>
+ or <STRONG>OK</STRONG>. This is likely an erratum.
- <B>o</B> Since the underlying <B>scanf(3)</B> can return the number of items
- scanned, and the SVr4 code was documented to use this feature, this
- is probably an editing error which was introduced in XSI, rather
- than being done intentionally.
+ <STRONG>o</STRONG> Since the underlying <STRONG>scanf(3)</STRONG> returns the number of successful
+ conversions, and SVr4 <EM>curses</EM> was documented to use this feature,
+ this may have been an editorial solecism introduced by X/Open,
+ rather than an intentional change.
- <B>o</B> This implementation returns the number of items scanned, for
- compatibility with SVr4 curses. As of 2018, NetBSD curses also
- returns the number of items scanned. Both ncurses and NetBSD
- curses call <B>vsscanf</B> to scan the string, which returns <B>EOF</B> on error.
+ <STRONG>o</STRONG> This implementation retains compatibility with SVr4 <EM>curses</EM>. As of
+ 2018, NetBSD <EM>curses</EM> also returns the number of successful
+ conversions. Both <EM>ncurses</EM> and NetBSD <EM>curses</EM> call <STRONG>vsscanf(3)</STRONG> to
+ scan the string, which returns <STRONG>EOF</STRONG> on error.
- <B>o</B> Portable applications should only test if the return value is <B>ERR</B>,
- since the <B>OK</B> value (zero) is likely to be misleading.
+ <STRONG>o</STRONG> Portable applications should test only if the return value is <STRONG>ERR</STRONG>,
+ and not compare it to <STRONG>OK</STRONG>, since that value (zero) might be
+ misleading.
+
+ One portable way to get useful results would be to use a "%n"
+ conversion at the end of the format string, and check the value of
+ the corresponding variable to determine how many conversions
+ succeeded.
+
+
+</PRE><H2><a name="h2-HISTORY">HISTORY</a></H2><PRE>
+ <STRONG>scanw</STRONG> was implemented in 4BSD (November 1980); that early version of
+ <EM>curses</EM> preceded the ANSI C standard of 1989. The function was unused
+ in Berkeley distributions for over ten years, until 4.4BSD, which
+ employed it in a game. The 4BSD <STRONG>scanw</STRONG> did not use <EM>varargs.h</EM>, though
+ that had been available since Seventh Edition Unix (1979). In 1991 (a
+ couple of years after SVr4 was generally available, and after the C
+ standard was published), other developers updated the library, using
+ <EM>stdarg.h</EM> internally in 4.4BSD <EM>curses</EM>. Even with this improvement, BSD
+ <EM>curses</EM> did not use function prototypes (nor even declare functions) in
+ <EM>curses.h</EM> until 1992.
- One possible way to get useful results would be to use a "%n"
- conversion at the end of the format string to ensure that something
- was processed.
+ SVr2 (1984) documented <STRONG>scanw</STRONG> and <STRONG>wscanw</STRONG> tersely as "scanf through
+ <STRONG>stdscr</STRONG>" and "scanf through <EM>win</EM>", respectively.
+
+ SVr3 (1987) added <STRONG>mvscanw</STRONG>, and <STRONG>mvwscanw</STRONG>, stating
+
+ "[t]hese routines correspond to <STRONG>scanf(3S)</STRONG>, as do their arguments
+ and return values. <STRONG>wgetstr</STRONG>() is called on the window, and the
+ resulting line is used as input for the scan."
+
+ SVr3 also implemented <STRONG>vwscanw</STRONG>, describing its third parameter as a
+ <EM>va</EM><STRONG>_</STRONG><EM>list</EM>, defined in <EM>varargs.h</EM>, and referred the reader to the manual
+ pages for <EM>varargs</EM> and <EM>vprintf</EM> for detailed descriptions. (Because the
+ SVr3 documentation does not mention <EM>vscanf</EM>, the reference to <EM>vprintf</EM>
+ might not be an error).
+
+ SVr4 (1989) introduced no new variations of <EM>scanw</EM>, but provided for
+ using either <EM>varargs.h</EM> or <EM>stdarg.h</EM> to define the <EM>va</EM><STRONG>_</STRONG><EM>list</EM> type.
+
+ X/Open Curses, Issue 4 (1995), defined <EM>vw</EM><STRONG>_</STRONG><EM>scanw</EM> to replace <EM>vwscanw</EM>,
+ stating that its <EM>va</EM><STRONG>_</STRONG><EM>list</EM> type is defined in <EM>stdarg.h</EM>.
</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
- <B><A HREF="curses.3X.html">curses(3X)</A></B>, <B><A HREF="curs_getstr.3X.html">curs_getstr(3X)</A></B>, <B><A HREF="curs_printw.3X.html">curs_printw(3X)</A></B>, <B><A HREF="curs_termcap.3X.html">curs_termcap(3X)</A></B>,
- <B>scanf(3)</B>.
+ <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_getstr.3x.html">curs_getstr(3x)</A></STRONG>, <STRONG><A HREF="curs_printw.3x.html">curs_printw(3x)</A></STRONG>, <STRONG>scanf(3)</STRONG>, <STRONG>vscanf(3)</STRONG>
- <B><A HREF="curs_scanw.3X.html">curs_scanw(3X)</A></B>
+ncurses 6.4 2024-04-20 <STRONG><A HREF="curs_scanw.3x.html">curs_scanw(3x)</A></STRONG>
</PRE>
<div class="nav">
<ul>
<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-HISTORY">HISTORY</a></li>
+<li><a href="#h2-NOTES">NOTES</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>