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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(const</STRONG> <STRONG>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>...);</STRONG>
  57        <STRONG>int</STRONG> <STRONG>wscanw(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>const</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>const</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>const</STRONG> <STRONG>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>...);</STRONG>
  60        <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>
  61
  62        /* obsolete */
  63        <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>
  64
  65
  66 </PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
  67        The <STRONG>scanw</STRONG>, <STRONG>wscanw</STRONG> and <STRONG>mvscanw</STRONG> routines  are  analogous  to  <STRONG>scanf</STRONG>  [see
  68        <STRONG>scanf(3)</STRONG>].   The  effect  of  these  routines is as though <STRONG>wgetstr</STRONG> were
  69        called on the  window,  and  the  resulting  line  used  as  input  for
  70        <STRONG>sscanf(3)</STRONG>.   Fields which do not map to a variable in the <EM>fmt</EM> field are
  71        lost.
  72
  73        The <STRONG>vwscanw</STRONG> and <STRONG>vw_scanw</STRONG> routines are  analogous  to  <STRONG>vscanf(3)</STRONG>.   They
  74        perform a <STRONG>wscanw</STRONG> using a variable argument list.  The third argument is
  75        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>.
  76
  77
  78 </PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
  79        <STRONG>vwscanw</STRONG> returns <STRONG>ERR</STRONG> on failure and an integer equal to  the  number  of
  80        fields scanned on success.
  81
  82        Applications  may  use the return value from the <STRONG>scanw</STRONG>, <STRONG>wscanw</STRONG>, <STRONG>mvscanw</STRONG>
  83        and <STRONG>mvwscanw</STRONG> routines to determine the  number  of  fields  which  were
  84        mapped in the call.
  85
  86        Functions  with  a  "mv"  prefix  first perform a cursor movement using
  87        <STRONG>wmove</STRONG>, and return an error if the position is outside the window, or if
  88        the window pointer is null.
  89
  90
  91 </PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
  92        In this implementation, <STRONG>vw_scanw</STRONG> and <STRONG>vwscanw</STRONG> are equivalent, to support
  93        legacy applications.  However, the latter (<STRONG>vwscanw</STRONG>) is obsolete:
  94
  95        <STRONG>o</STRONG>   The XSI Curses standard, Issue 4 described these functions,  noting
  96            that  the  function <STRONG>vwscanw</STRONG> is marked TO BE WITHDRAWN, and is to be
  97            replaced by a function <STRONG>vw_scanw</STRONG> using the <STRONG>&lt;stdarg.h&gt;</STRONG> interface.
  98
  99        <STRONG>o</STRONG>   The Single Unix Specification, Version 2 states that  <STRONG>vw_scanw</STRONG>   is
 100            preferred   to   <STRONG>vwscanw</STRONG>   since   the  latter  requires  including
 101            <STRONG>&lt;varargs.h&gt;</STRONG>, which cannot be used in the same file  as  <STRONG>&lt;stdarg.h&gt;</STRONG>.
 102            This  implementation  uses <STRONG>&lt;stdarg.h&gt;</STRONG> for both, because that header
 103            is included in <STRONG>&lt;curses.h</STRONG>&gt;.
 104
 105        <STRONG>o</STRONG>   X/Open Curses, Issue 5 (December 2007) marked <STRONG>vwscanw</STRONG>  (along  with
 106            <STRONG>vwprintw</STRONG> and the termcap interface) as withdrawn.
 107
 108        Both  XSI and The Single Unix Specification, Version 2 state that these
 109        functions return <STRONG>ERR</STRONG> or <STRONG>OK</STRONG>.
 110
 111        <STRONG>o</STRONG>   Since the underlying  <STRONG>scanf(3)</STRONG>  can  return  the  number  of  items
 112            scanned, and the SVr4 code was documented to use this feature, this
 113            is probably an editing error which was introduced  in  XSI,  rather
 114            than being done intentionally.
 115
 116        <STRONG>o</STRONG>   This  implementation  returns the number of items scanned, for com-
 117            patibility with SVr4  curses.   As  of  2018,  NetBSD  curses  also
 118            returns  the  number  of  items  scanned.   Both ncurses and NetBSD
 119            curses call <STRONG>vsscanf</STRONG> to scan the string, which returns <STRONG>EOF</STRONG> on error.
 120
 121        <STRONG>o</STRONG>   Portable applications should only test if the return value is  <STRONG>ERR</STRONG>,
 122            since the <STRONG>OK</STRONG> value (zero) is likely to be misleading.
 123
 124            One  possible way to get useful results would be to use a "%n" con-
 125            version at the end of the format string to  ensure  that  something
 126            was processed.
 127
 128
 129 </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
 130        <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>,
 131        <STRONG>scanf(3)</STRONG>.
 132
 133
 134
 135                                                                 <STRONG><A HREF="curs_scanw.3x.html">curs_scanw(3x)</A></STRONG>
 136 </PRE>
 137 <div class="nav">
 138 <ul>
 139 <li><a href="#h2-NAME">NAME</a></li>
 140 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
 141 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
 142 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
 143 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
 144 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
 145 </ul>
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