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32<HTML>
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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