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+<!--
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- * Copyright (c) 1998-2017,2018 Free Software Foundation, Inc. *
+ * Copyright 2018-2019,2020 Thomas E. Dickey *
+ * Copyright 1998-2010,2017 Free Software Foundation, Inc. *
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- * @Id: curs_scanw.3x,v 1.24 2018/07/28 21:14:06 tom Exp @
+ * @Id: curs_scanw.3x,v 1.28 2020/10/24 09:29:26 tom Exp @
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-<H1 class="no-header">curs_scanw 3x</H1>
+<H1 class="no-header">curs_scanw 3X</H1>
<PRE>
-<STRONG><A HREF="curs_scanw.3x.html">curs_scanw(3x)</A></STRONG> <STRONG><A HREF="curs_scanw.3x.html">curs_scanw(3x)</A></STRONG>
+<B><A HREF="curs_scanw.3X.html">curs_scanw(3X)</A></B> <B><A HREF="curs_scanw.3X.html">curs_scanw(3X)</A></B>
</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
- <STRONG>scanw</STRONG>, <STRONG>wscanw</STRONG>, <STRONG>mvscanw</STRONG>, <STRONG>mvwscanw</STRONG>, <STRONG>vwscanw</STRONG>, <STRONG>vw_scanw</STRONG> - convert formatted
- input from a <STRONG>curses</STRONG> window
+ <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
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
- <STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
+ <B>#include</B> <B><curses.h></B>
- <STRONG>int</STRONG> <STRONG>scanw(const</STRONG> <STRONG>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>...);</STRONG>
- <STRONG>int</STRONG> <STRONG>wscanw(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>const</STRONG> <STRONG>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>...);</STRONG>
- <STRONG>int</STRONG> <STRONG>mvscanw(int</STRONG> <STRONG>y,</STRONG> <STRONG>int</STRONG> <STRONG>x,</STRONG> <STRONG>const</STRONG> <STRONG>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>...);</STRONG>
- <STRONG>int</STRONG> <STRONG>mvwscanw(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>y,</STRONG> <STRONG>int</STRONG> <STRONG>x,</STRONG> <STRONG>const</STRONG> <STRONG>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>...);</STRONG>
- <STRONG>int</STRONG> <STRONG>vw_scanw(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>const</STRONG> <STRONG>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>va_list</STRONG> <STRONG>varglist);</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>
+
+ <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>
/* obsolete */
- <STRONG>int</STRONG> <STRONG>vwscanw(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>const</STRONG> <STRONG>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>va_list</STRONG> <STRONG>varglist);</STRONG>
+ <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>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
- The <STRONG>scanw</STRONG>, <STRONG>wscanw</STRONG> and <STRONG>mvscanw</STRONG> routines are analogous to <STRONG>scanf</STRONG> [see
- <STRONG>scanf(3)</STRONG>]. The effect of these routines is as though <STRONG>wgetstr</STRONG> were
+ 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
- <STRONG>sscanf(3)</STRONG>. Fields which do not map to a variable in the <EM>fmt</EM> field are
+ <B>sscanf(3)</B>. Fields which do not map to a variable in the <I>fmt</I> field are
lost.
- The <STRONG>vwscanw</STRONG> and <STRONG>vw_scanw</STRONG> routines are analogous to <STRONG>vscanf(3)</STRONG>. They
- 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 <STRONG><stdarg.h></STRONG>.
+ 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>.
</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
- <STRONG>vwscanw</STRONG> returns <STRONG>ERR</STRONG> on failure and an integer equal to the number of
+ <B>vwscanw</B> returns <B>ERR</B> on failure and an integer equal to the number of
fields scanned on success.
- Applications may use the return value from the <STRONG>scanw</STRONG>, <STRONG>wscanw</STRONG>, <STRONG>mvscanw</STRONG>
- and <STRONG>mvwscanw</STRONG> routines to determine the number of fields which were
+ 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.
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
+ <B>wmove</B>, and return an error if the position is outside the window, or if
the window pointer is null.
+</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-PORTABILITY">PORTABILITY</a></H2><PRE>
- In this implementation, <STRONG>vw_scanw</STRONG> and <STRONG>vwscanw</STRONG> are equivalent, to support
- legacy applications. However, the latter (<STRONG>vwscanw</STRONG>) is obsolete:
+ 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:
- <STRONG>o</STRONG> The XSI Curses standard, Issue 4 described these functions, noting
- that the function <STRONG>vwscanw</STRONG> is marked TO BE WITHDRAWN, and is to be
- replaced by a function <STRONG>vw_scanw</STRONG> using the <STRONG><stdarg.h></STRONG> interface.
+ <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> The Single Unix Specification, Version 2 states that <STRONG>vw_scanw</STRONG> is
- preferred to <STRONG>vwscanw</STRONG> since the latter requires including
- <STRONG><varargs.h></STRONG>, which cannot be used in the same file as <STRONG><stdarg.h></STRONG>.
- This implementation uses <STRONG><stdarg.h></STRONG> for both, because that header
- is included in <STRONG><curses.h</STRONG>>.
+ <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 (December 2007) marked <STRONG>vwscanw</STRONG> (along with
- <STRONG>vwprintw</STRONG> and the termcap interface) as withdrawn.
+ <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.
- Both XSI and The Single Unix Specification, Version 2 state that these
- functions return <STRONG>ERR</STRONG> or <STRONG>OK</STRONG>.
+ Both XSI and The Single Unix Specification, Version 2 state that these
+ functions return <B>ERR</B> or <B>OK</B>.
- <STRONG>o</STRONG> Since the underlying <STRONG>scanf(3)</STRONG> can return the number of items
+ <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
+ is probably an editing error which was introduced in XSI, rather
than being done intentionally.
- <STRONG>o</STRONG> This implementation returns the number of items scanned, for com-
- patibility with SVr4 curses. As of 2018, NetBSD curses also
- returns the number of items scanned. Both ncurses and NetBSD
- curses call <STRONG>vsscanf</STRONG> to scan the string, which returns <STRONG>EOF</STRONG> on error.
+ <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> Portable applications should only test if the return value is <STRONG>ERR</STRONG>,
- since the <STRONG>OK</STRONG> value (zero) is likely to be misleading.
+ <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.
- One possible way to get useful results would be to use a "%n" con-
- version at the end of the format string to ensure that something
+ 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.
</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_getstr.3x.html">curs_getstr(3x)</A></STRONG>, <STRONG><A HREF="curs_printw.3x.html">curs_printw(3x)</A></STRONG>, <STRONG><A HREF="curs_termcap.3x.html">curs_termcap(3x)</A></STRONG>,
- <STRONG>scanf(3)</STRONG>.
+ <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="curs_scanw.3x.html">curs_scanw(3x)</A></STRONG>
+ <B><A HREF="curs_scanw.3X.html">curs_scanw(3X)</A></B>
</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-PORTABILITY">PORTABILITY</a></li>
<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
</ul>