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33 <HEAD>
34 <TITLE>curs_scanw 3x</TITLE>
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39 <H1>curs_scanw 3x</H1>
40 <HR>
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
90 </PRE>
91 <H2>PORTABILITY</H2><PRE>
92        The XSI Curses standard, Issue  4  describes  these  func-
93        tions.   The  function  <STRONG>vwscanw</STRONG> is marked TO BE WITHDRAWN,
94        and is to be replaced by a  function  <STRONG>vw_scanw</STRONG>  using  the
95        <STRONG>&lt;stdarg.h&gt;</STRONG> interface.  The Single Unix Specification, Ver-
96        sion 2 states that <STRONG>vw_scanw</STRONG>  is preferred to <STRONG>vwscanw</STRONG> since
97        the latter requires including <STRONG>&lt;varargs.h&gt;</STRONG>, which cannot be
98        used in the same file as <STRONG>&lt;stdarg.h&gt;</STRONG>.  This  implementation
99        uses  <STRONG>&lt;stdarg.h&gt;</STRONG> for both, because that header is included
100        in <STRONG>&lt;curses.h</STRONG>&gt;.
101
102        Both XSI and The  Single  Unix  Specification,  Version  2
103        state  that  these  functions return ERR or OK.  Since the
104        underlying <STRONG>scanf</STRONG> can return the number of  items  scanned,
105        and the SVr4 code was documented to use this feature, this
106        is probably an editing error which was introduced in  XSI,
107        rather  than  being done intentionally.  Portable applica-
108        tions should only test if the return value is  ERR,  since
109        the  OK value (zero) is likely to be misleading.  One pos-
110        sible way to get useful results would be  to  use  a  "%n"
111        conversion  at the end of the format string to ensure that
112        something was processed.
113
114
115 </PRE>
116 <H2>SEE ALSO</H2><PRE>
117        <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>
118
119
120
121                                                          <STRONG><A HREF="curs_scanw.3x.html">curs_scanw(3x)</A></STRONG>
122 </PRE>
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