ncurses-5.7/doc/html/man/curs_scanw.3x.html

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<!-- 
  ****************************************************************************
  * Copyright (c) 1998-2000,2006 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            *
  * "Software"), to deal in the Software without restriction, including      *
  * without limitation the rights to use, copy, modify, merge, publish,      *
  * distribute, distribute with modifications, sublicense, and/or sell       *
  * copies of the Software, and to permit persons to whom the Software is    *
  * furnished to do so, subject to the following conditions:                 *
  *                                                                          *
  * The above copyright notice and this permission notice shall be included  *
  * in all copies or substantial portions of the Software.                   *
  *                                                                          *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
  *                                                                          *
  * Except as contained in this notice, the name(s) of the above copyright   *
  * holders shall not be used in advertising or otherwise to promote the     *
  * sale, use or other dealings in this Software without prior written       *
  * authorization.                                                           *
  ****************************************************************************
  * @Id: curs_scanw.3x,v 1.14 2006/12/24 16:05:49 tom Exp @
-->
<HTML>
<HEAD>
<TITLE>curs_scanw 3x</TITLE>
<link rev=made href="mailto:bug-ncurses@gnu.org">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</HEAD>
<BODY>
<H1>curs_scanw 3x</H1>
<HR>
<PRE>
<!-- Manpage converted by man2html 3.0.1 -->
<STRONG><A HREF="curs_scanw.3x.html">curs_scanw(3x)</A></STRONG>                                           <STRONG><A HREF="curs_scanw.3x.html">curs_scanw(3x)</A></STRONG>




</PRE>
<H2>NAME</H2><PRE>
       <STRONG>scanw</STRONG>, <STRONG>wscanw</STRONG>, <STRONG>mvscanw</STRONG>, <STRONG>mvwscanw</STRONG>, <STRONG>vwscanw</STRONG>, <STRONG>vw_scanw</STRONG> - con-
       vert formatted input from a <STRONG>curses</STRONG> window


</PRE>
<H2>SYNOPSIS</H2><PRE>
       <STRONG>#include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>

       <STRONG>int</STRONG> <STRONG>scanw(char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>...);</STRONG>
       <STRONG>int</STRONG> <STRONG>wscanw(WINDOW</STRONG> <STRONG>*win,</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>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>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>...);</STRONG>
       <STRONG>int</STRONG> <STRONG>vw_scanw(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>va_list</STRONG> <STRONG>varglist);</STRONG>
       <STRONG>int</STRONG> <STRONG>vwscanw(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>va_list</STRONG> <STRONG>varglist);</STRONG>


</PRE>
<H2>DESCRIPTION</H2><PRE>
       The <STRONG>scanw</STRONG>, <STRONG>wscanw</STRONG> and <STRONG>mvscanw</STRONG> routines  are  analogous  to
       <STRONG>scanf</STRONG>  [see <STRONG><A HREF="scanf.3.html">scanf(3)</A></STRONG>].  The effect of these routines is as
       though <STRONG>wgetstr</STRONG> were called on the window, and the  result-
       ing line used as input for <STRONG><A HREF="sscanf.3.html">sscanf(3)</A></STRONG>.  Fields which do not
       map to a variable in the <EM>fmt</EM> field are lost.

       The <STRONG>vwscanw</STRONG> and <STRONG>vw_scanw</STRONG> routines are analogous to <STRONG>vscanf</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  argu-
       ments, as defined in <STRONG>&lt;stdarg.h&gt;</STRONG>.


</PRE>
<H2>RETURN VALUE</H2><PRE>
       <STRONG>vwscanw</STRONG> returns <STRONG>ERR</STRONG> 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 mapped in the call.


</PRE>
<H2>PORTABILITY</H2><PRE>
       The XSI Curses standard, Issue  4  describes  these  func-
       tions.   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>&lt;stdarg.h&gt;</STRONG> interface.  The Single Unix Specification, Ver-
       sion 2 states that <STRONG>vw_scanw</STRONG>  is preferred to <STRONG>vwscanw</STRONG> since
       the latter requires including <STRONG>&lt;varargs.h&gt;</STRONG>, which cannot be
       used in the same file as <STRONG>&lt;stdarg.h&gt;</STRONG>.  This  implementation
       uses  <STRONG>&lt;stdarg.h&gt;</STRONG> for both, because that header is included
       in <STRONG>&lt;curses.h</STRONG>&gt;.

       Both XSI and The  Single  Unix  Specification,  Version  2
       state  that  these  functions return ERR or OK.  Since the
       underlying <STRONG>scanf</STRONG> 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.  Portable applica-
       tions should only test if the return value is  ERR,  since
       the  OK value (zero) is likely to be misleading.  One pos-
       sible 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>SEE ALSO</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="scanf.3.html">scanf(3)</A></STRONG>



                                                         <STRONG><A HREF="curs_scanw.3x.html">curs_scanw(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>
</BODY>
</HTML>