release/src/router/libncurses/doc/html/man/curs_scanw.3x.html

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  30   * @Id: curs_scanw.3x,v 1.17 2010/12/04 18:40:45 tom Exp @
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  39 <H1>curs_scanw 3x</H1>
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  41 <PRE>
  42 <!-- Manpage converted by man2html 3.0.1 -->
  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>
  49 <H2>NAME</H2><PRE>
  50        <STRONG>scanw</STRONG>, <STRONG>wscanw</STRONG>, <STRONG>mvscanw</STRONG>, <STRONG>mvwscanw</STRONG>, <STRONG>vwscanw</STRONG>, <STRONG>vw_scanw</STRONG> - con-
  51        vert formatted input from a <STRONG>curses</STRONG> window
  52
  53
  54 </PRE>
  55 <H2>SYNOPSIS</H2><PRE>
  56        <STRONG>#include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>
  57
  58        <STRONG>int</STRONG> <STRONG>scanw(char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>...);</STRONG>
  59        <STRONG>int</STRONG> <STRONG>wscanw(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>...);</STRONG>
  60        <STRONG>int</STRONG> <STRONG>mvscanw(int</STRONG> <STRONG>y,</STRONG> <STRONG>int</STRONG> <STRONG>x,</STRONG> <STRONG>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>...);</STRONG>
  61        <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>
  62        <STRONG>int</STRONG> <STRONG>vw_scanw(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>va_list</STRONG> <STRONG>varglist);</STRONG>
  63        <STRONG>int</STRONG> <STRONG>vwscanw(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>va_list</STRONG> <STRONG>varglist);</STRONG>
  64
  65
  66 </PRE>
  67 <H2>DESCRIPTION</H2><PRE>
  68        The <STRONG>scanw</STRONG>, <STRONG>wscanw</STRONG> and <STRONG>mvscanw</STRONG> routines  are  analogous  to
  69        <STRONG>scanf</STRONG>  [see <STRONG><A HREF="scanf.3.html">scanf(3)</A></STRONG>].  The effect of these routines is as
  70        though <STRONG>wgetstr</STRONG> were called on the window, and the  result-
  71        ing line used as input for <STRONG><A HREF="sscanf.3.html">sscanf(3)</A></STRONG>.  Fields which do not
  72        map to a variable in the <EM>fmt</EM> field are lost.
  73
  74        The <STRONG>vwscanw</STRONG> and <STRONG>vw_scanw</STRONG> routines are analogous to <STRONG>vscanf</STRONG>.
  75        They perform a <STRONG>wscanw</STRONG> using a variable argument list.  The
  76        third argument is a <EM>va</EM><STRONG>_</STRONG><EM>list</EM>, a pointer to a list of  argu-
  77        ments, as defined in <STRONG>&lt;stdarg.h&gt;</STRONG>.
  78
  79
  80 </PRE>
  81 <H2>RETURN VALUE</H2><PRE>
  82        <STRONG>vwscanw</STRONG> returns <STRONG>ERR</STRONG> on failure and an integer equal to the
  83        number of fields scanned on success.
  84
  85        Applications may use the  return  value  from  the  <STRONG>scanw</STRONG>,
  86        <STRONG>wscanw</STRONG>,  <STRONG>mvscanw</STRONG>  and  <STRONG>mvwscanw</STRONG>  routines to determine the
  87        number of fields which were mapped in the call.
  88
  89        Functions with a "mv" prefix first perform a cursor  move-
  90        ment  using  <STRONG>wmove</STRONG>, and return an error if the position is
  91        outside the window, or if the window pointer is null.
  92
  93
  94 </PRE>
  95 <H2>PORTABILITY</H2><PRE>
  96        The XSI Curses standard, Issue  4  describes  these  func-
  97        tions.   The  function  <STRONG>vwscanw</STRONG> is marked TO BE WITHDRAWN,
  98        and is to be replaced by a  function  <STRONG>vw_scanw</STRONG>  using  the
  99        <STRONG>&lt;stdarg.h&gt;</STRONG> interface.  The Single Unix Specification, Ver-
 100        sion 2 states that <STRONG>vw_scanw</STRONG>  is preferred to <STRONG>vwscanw</STRONG> since
 101        the latter requires including <STRONG>&lt;varargs.h&gt;</STRONG>, which cannot be
 102        used in the same file as <STRONG>&lt;stdarg.h&gt;</STRONG>.  This  implementation
 103        uses  <STRONG>&lt;stdarg.h&gt;</STRONG> for both, because that header is included
 104        in <STRONG>&lt;curses.h</STRONG>&gt;.
 105
 106        Both XSI and The  Single  Unix  Specification,  Version  2
 107        state  that  these  functions return ERR or OK.  Since the
 108        underlying <STRONG>scanf</STRONG> can return the number of  items  scanned,
 109        and the SVr4 code was documented to use this feature, this
 110        is probably an editing error which was introduced in  XSI,
 111        rather  than  being done intentionally.  Portable applica-
 112        tions should only test if the return value is  ERR,  since
 113        the  OK value (zero) is likely to be misleading.  One pos-
 114        sible way to get useful results would be  to  use  a  "%n"
 115        conversion  at the end of the format string to ensure that
 116        something was processed.
 117
 118
 119 </PRE>
 120 <H2>SEE ALSO</H2><PRE>
 121        <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>
 122
 123
 124
 125                                                          <STRONG><A HREF="curs_scanw.3x.html">curs_scanw(3x)</A></STRONG>
 126 </PRE>
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