98 lines
4.9 KiB
Plaintext
98 lines
4.9 KiB
Plaintext
.\"***************************************************************************
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.\" Copyright (c) 1998-2000,2006 Free Software Foundation, Inc. *
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.\" *
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.\" Permission is hereby granted, free of charge, to any person obtaining a *
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.\" copy of this software and associated documentation files (the *
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.\" "Software"), to deal in the Software without restriction, including *
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.\" without limitation the rights to use, copy, modify, merge, publish, *
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.\" distribute, distribute with modifications, sublicense, and/or sell *
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.\" copies of the Software, and to permit persons to whom the Software is *
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.\" furnished to do so, subject to the following conditions: *
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.\" *
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.\" The above copyright notice and this permission notice shall be included *
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.\" in all copies or substantial portions of the Software. *
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.\" *
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
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.\" IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
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.\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
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.\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
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.\" THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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.\" *
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.\" Except as contained in this notice, the name(s) of the above copyright *
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.\" holders shall not be used in advertising or otherwise to promote the *
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.\" sale, use or other dealings in this Software without prior written *
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.\" authorization. *
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.\"***************************************************************************
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.\"
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.\" $Id: curs_scanw.3x,v 1.13 2006/02/25 21:42:22 tom Exp $
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.TH curs_scanw 3X ""
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.SH NAME
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\fBscanw\fR,
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\fBwscanw\fR,
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\fBmvscanw\fR,
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\fBmvwscanw\fR,
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\fBvwscanw\fR, \fBvw_scanw\fR - convert formatted input from a \fBcurses\fR window
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.SH SYNOPSIS
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\fB#include <curses.h>\fR
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.sp
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\fBint scanw(char *fmt, ...);\fR
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.br
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\fBint wscanw(WINDOW *win, char *fmt, ...);\fR
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.br
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\fBint mvscanw(int y, int x, char *fmt, ...);\fR
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.br
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\fBint mvwscanw(WINDOW *win, int y, int x, char *fmt, ...);\fR
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.br
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\fBint vw_scanw(WINDOW *win, char *fmt, va_list varglist);\fR
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.br
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\fBint vwscanw(WINDOW *win, char *fmt, va_list varglist);\fR
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.SH DESCRIPTION
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The \fBscanw\fR, \fBwscanw\fR and \fBmvscanw\fR routines are analogous to
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\fBscanf\fR [see \fBscanf\fR(3S)]. The effect of these routines is as though
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\fBwgetstr\fR were called on the window, and the resulting line used as input
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for \fBsscanf\fR(3). Fields which do not map to a variable in the \fIfmt\fR
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field are lost.
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.PP
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The \fBvwscanw\fR and \fBvw_scanw\fR routines are analogous to \fBvscanf\fR.
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They perform a \fBwscanw\fR using a variable argument list.
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The third argument is a \fIva_list\fR,
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a pointer to a list of arguments, as defined in \fB<stdarg.h>\fR.
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.SH RETURN VALUE
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\fBvwscanw\fR returns \fBERR\fR on failure and an integer equal to the
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number of fields scanned on success.
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.PP
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Applications may use the return value from the \fBscanw\fR, \fBwscanw\fR,
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\fBmvscanw\fR and \fBmvwscanw\fR routines to determine the number of fields
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which were mapped in the call.
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.SH PORTABILITY
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The XSI Curses standard, Issue 4 describes these functions. The function
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\fBvwscanw\fR is marked TO BE WITHDRAWN, and is to be replaced by a function
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\fBvw_scanw\fR using the \fB<stdarg.h>\fR interface.
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The Single Unix Specification, Version 2 states that
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\fBvw_scanw\fR is preferred to \fBvwscanw\fR since the latter requires
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including \fB<varargs.h>\fR, which
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cannot be used in the same file as \fB<stdarg.h>\fR.
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This implementation uses \fB<stdarg.h>\fR for both, because that header
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is included in \fB<curses.h\fR>.
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.LP
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Both XSI and The Single Unix Specification, Version 2 state that these
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functions return ERR or OK.
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Since the underlying \fBscanf\fR can return the number of items scanned,
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and the SVr4 code was documented to use this feature,
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this is probably an editing error which was introduced in XSI,
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rather than being done intentionally.
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Portable applications should only test if the return value is ERR,
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since the OK value (zero) is likely to be misleading.
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One possible way to get useful results would be to use a "%n" conversion
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at the end of the format string to ensure that something was processed.
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.SH SEE ALSO
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\fBcurses\fR(3X), \fBcurs_getstr\fR(3X), \fBcurs_printw\fR(3X), \fBscanf\fR(3S)
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.\"#
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.\"# The following sets edit modes for GNU EMACS
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.\"# Local Variables:
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.\"# mode:nroff
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.\"# fill-column:79
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.\"# End:
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