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  41 <H1 class="no-header">curs_scanw 3x</H1>
  42 <PRE>
  43 <STRONG><A HREF="curs_scanw.3x.html">curs_scanw(3x)</A></STRONG>                                                  <STRONG><A HREF="curs_scanw.3x.html">curs_scanw(3x)</A></STRONG>
  44
  45
  46
  47
  48 </PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
  49        <STRONG>scanw</STRONG>, <STRONG>wscanw</STRONG>, <STRONG>mvscanw</STRONG>, <STRONG>mvwscanw</STRONG>, <STRONG>vwscanw</STRONG>, <STRONG>vw_scanw</STRONG> - convert formatted
  50        input from a <STRONG>curses</STRONG> window
  51
  52
  53 </PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
  54        <STRONG>#include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>
  55
  56        <STRONG>int</STRONG> <STRONG>scanw(char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>...);</STRONG>
  57        <STRONG>int</STRONG> <STRONG>wscanw(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>...);</STRONG>
  58        <STRONG>int</STRONG> <STRONG>mvscanw(int</STRONG> <STRONG>y,</STRONG> <STRONG>int</STRONG> <STRONG>x,</STRONG> <STRONG>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>...);</STRONG>
  59        <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>
  60        <STRONG>int</STRONG> <STRONG>vw_scanw(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>va_list</STRONG> <STRONG>varglist);</STRONG>
  61        <STRONG>int</STRONG> <STRONG>vwscanw(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>va_list</STRONG> <STRONG>varglist);</STRONG>
  62
  63
  64 </PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
  65        The <STRONG>scanw</STRONG>, <STRONG>wscanw</STRONG> and <STRONG>mvscanw</STRONG> routines  are  analogous  to  <STRONG>scanf</STRONG>  [see
  66        <STRONG>scanf(3)</STRONG>].   The  effect  of  these  routines is as though <STRONG>wgetstr</STRONG> were
  67        called on the  window,  and  the  resulting  line  used  as  input  for
  68        <STRONG>sscanf(3)</STRONG>.   Fields which do not map to a variable in the <EM>fmt</EM> field are
  69        lost.
  70
  71        The <STRONG>vwscanw</STRONG> and <STRONG>vw_scanw</STRONG> routines are  analogous  to  <STRONG>vscanf(3)</STRONG>.   They
  72        perform a <STRONG>wscanw</STRONG> using a variable argument list.  The third argument is
  73        a <EM>va</EM><STRONG>_</STRONG><EM>list</EM>, a pointer to a list of arguments, as defined in <STRONG>&lt;stdarg.h&gt;</STRONG>.
  74
  75
  76 </PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
  77        <STRONG>vwscanw</STRONG> returns <STRONG>ERR</STRONG> on failure and an integer equal to  the  number  of
  78        fields scanned on success.
  79
  80        Applications  may  use the return value from the <STRONG>scanw</STRONG>, <STRONG>wscanw</STRONG>, <STRONG>mvscanw</STRONG>
  81        and <STRONG>mvwscanw</STRONG> routines to determine the  number  of  fields  which  were
  82        mapped in the call.
  83
  84        Functions  with  a  "mv"  prefix  first perform a cursor movement using
  85        <STRONG>wmove</STRONG>, and return an error if the position is outside the window, or if
  86        the window pointer is null.
  87
  88
  89 </PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
  90        The  XSI Curses standard, Issue 4 describes these functions.  The func-
  91        tion <STRONG>vwscanw</STRONG> is marked TO BE WITHDRAWN, and is  to  be  replaced  by  a
  92        function  <STRONG>vw_scanw</STRONG>  using  the  <STRONG>&lt;stdarg.h&gt;</STRONG>  interface.  The Single Unix
  93        Specification, Version 2 states that <STRONG>vw_scanw</STRONG>  is preferred to  <STRONG>vwscanw</STRONG>
  94        since  the  latter requires including <STRONG>&lt;varargs.h&gt;</STRONG>, which cannot be used
  95        in the same file as <STRONG>&lt;stdarg.h&gt;</STRONG>.  This  implementation  uses  <STRONG>&lt;stdarg.h&gt;</STRONG>
  96        for both, because that header is included in <STRONG>&lt;curses.h</STRONG>&gt;.
  97
  98        Both  XSI and The Single Unix Specification, Version 2 state that these
  99        functions return <STRONG>ERR</STRONG> or <STRONG>OK</STRONG>.  Since the underlying <STRONG>scanf(3)</STRONG>  can  return
 100        the  number  of  items scanned, and the SVr4 code was documented to use
 101        this feature, this is probably an editing error which was introduced in
 102        XSI,  rather  than  being  done  intentionally.   Portable applications
 103        should only test if the return value is <STRONG>ERR</STRONG>, since the <STRONG>OK</STRONG> value  (zero)
 104        is  likely  to  be  misleading.  One possible way to get useful results
 105        would be to use a "%n" conversion at the end of the  format  string  to
 106        ensure that something was processed.
 107
 108
 109 </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
 110        <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>
 111
 112
 113
 114                                                                 <STRONG><A HREF="curs_scanw.3x.html">curs_scanw(3x)</A></STRONG>
 115 </PRE>
 116 <div class="nav">
 117 <ul>
 118 <li><a href="#h2-NAME">NAME</a></li>
 119 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
 120 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
 121 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
 122 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
 123 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
 124 </ul>
 125 </div>
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