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30 * @Id: curs_scanw.3x,v 1.12 2002/07/20 15:48:09 tom Exp @
34 <TITLE>curs_scanw 3x</TITLE>
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39 <H1>curs_scanw 3x</H1>
42 <!-- Manpage converted by man2html 3.0.1 -->
46 <STRONG>scanw</STRONG>, <STRONG>wscanw</STRONG>, <STRONG>mvscanw</STRONG>, <STRONG>mvwscanw</STRONG>, <STRONG>vwscanw</STRONG>, <STRONG>vw_scanw</STRONG> - con-
47 vert formatted input from a <STRONG>curses</STRONG> window
51 <H2>SYNOPSIS</H2><PRE>
52 <STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
54 <STRONG>int</STRONG> <STRONG>scanw(char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>...);</STRONG>
55 <STRONG>int</STRONG> <STRONG>wscanw(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>...);</STRONG>
56 <STRONG>int</STRONG> <STRONG>mvscanw(int</STRONG> <STRONG>y,</STRONG> <STRONG>int</STRONG> <STRONG>x,</STRONG> <STRONG>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>...);</STRONG>
57 <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>
58 <STRONG>int</STRONG> <STRONG>vw_scanw(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>va_list</STRONG> <STRONG>varglist);</STRONG>
59 <STRONG>int</STRONG> <STRONG>vwscanw(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>char</STRONG> <STRONG>*fmt,</STRONG> <STRONG>va_list</STRONG> <STRONG>varglist);</STRONG>
63 <H2>DESCRIPTION</H2><PRE>
64 The <STRONG>scanw</STRONG>, <STRONG>wscanw</STRONG> and <STRONG>mvscanw</STRONG> routines are analogous to
65 <STRONG>scanf</STRONG> [see <STRONG><A HREF="scanf.3S.html">scanf(3S)</A></STRONG>]. The effect of these routines is as
66 though <STRONG>wgetstr</STRONG> were called on the window, and the result-
67 ing line used as input for <STRONG><A HREF="sscanf.3.html">sscanf(3)</A></STRONG>. Fields which do not
68 map to a variable in the <EM>fmt</EM> field are lost.
70 The <STRONG>vwscanw</STRONG> and <STRONG>vw_scanw</STRONG> routines are analogous to <STRONG>vscanf</STRONG>.
71 They perform a <STRONG>wscanw</STRONG> using a variable argument list. The
72 third argument is a <EM>va</EM><STRONG>_</STRONG><EM>list</EM>, a pointer to a list of argu-
73 ments, as defined in <STRONG><stdarg.h></STRONG>.
77 <H2>RETURN VALUE</H2><PRE>
78 <STRONG>vwscanw</STRONG> returns <STRONG>ERR</STRONG> on failure and an integer equal to the
79 number of fields scanned on success.
81 Applications may use the return value from the <STRONG>scanw</STRONG>,
82 <STRONG>wscanw</STRONG>, <STRONG>mvscanw</STRONG> and <STRONG>mvwscanw</STRONG> routines to determine the
83 number of fields which were mapped in the call.
87 <H2>PORTABILITY</H2><PRE>
88 The XSI Curses standard, Issue 4 describes these func-
89 tions. The function <STRONG>vwscanw</STRONG> is marked TO BE WITHDRAWN,
90 and is to be replaced by a function <STRONG>vw_scanw</STRONG> using the
91 <STRONG><stdarg.h></STRONG> interface. The Single Unix Specification, Ver-
92 sion 2 states that <STRONG>vw_scanw</STRONG> is preferred to <STRONG>vwscanw</STRONG> since
93 the latter requires including <STRONG><varargs.h></STRONG>, which cannot be
94 used in the same file as <STRONG><stdarg.h></STRONG>. This implementation
95 uses <STRONG><stdarg.h></STRONG> for both, because that header is included
96 in <STRONG><curses.h</STRONG>>.
98 Both XSI and The Single Unix Specification, Version 2
99 state that these functions return ERR or OK. Since the
100 underlying <STRONG>scanf</STRONG> can return the number of items scanned,
101 and the SVr4 code was documented to use this feature, this
102 is probably an editing error which was introduced in XSI,
103 rather than being done intentionally. Portable applica-
104 tions should only test if the return value is ERR, since
105 the OK value (zero) is likely to be misleading. One pos-
106 sible way to get useful results would be to use a "%n"
107 conversion at the end of the format string to ensure that
108 something was processed.
112 <H2>SEE ALSO</H2><PRE>
113 <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.3S.html">scanf(3S)</A></STRONG>
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