***************************************************************************
Copyright (c) 1998-2000,2006 Free Software Foundation, Inc. *
*
Permission is hereby granted, free of charge, to any person obtaining a *
copy of this software and associated documentation files (the *
"Software"), to deal in the Software without restriction, including *
without limitation the rights to use, copy, modify, merge, publish, *
distribute, distribute with modifications, sublicense, and/or sell *
copies of the Software, and to permit persons to whom the Software is *
furnished to do so, subject to the following conditions: *
*
The above copyright notice and this permission notice shall be included *
in all copies or substantial portions of the Software. *
*
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
*
Except as contained in this notice, the name(s) of the above copyright *
holders shall not be used in advertising or otherwise to promote the *
sale, use or other dealings in this Software without prior written *
authorization. *
***************************************************************************

$Id: curs_scanw.3x,v 1.14 2006/12/24 16:05:49 tom Exp $
scanw, wscanw, mvscanw, mvwscanw, vwscanw, vw_scanw - convert formatted input from a curses window #include <curses.h> int scanw(char *fmt, ...);

int wscanw(WINDOW *win, char *fmt, ...);

int mvscanw(int y, int x, char *fmt, ...);

int mvwscanw(WINDOW *win, int y, int x, char *fmt, ...);

int vw_scanw(WINDOW *win, char *fmt, va_list varglist);

int vwscanw(WINDOW *win, char *fmt, va_list varglist);

The scanw, wscanw and mvscanw routines are analogous to scanf [see scanf(3)]. The effect of these routines is as though wgetstr were called on the window, and the resulting line used as input for sscanf(3). Fields which do not map to a variable in the fmt field are lost.

The vwscanw and vw_scanw routines are analogous to vscanf. They perform a wscanw using a variable argument list. The third argument is a va_list, a pointer to a list of arguments, as defined in <stdarg.h>.

vwscanw returns ERR on failure and an integer equal to the number of fields scanned on success.

Applications may use the return value from the scanw, wscanw, mvscanw and mvwscanw routines to determine the number of fields which were mapped in the call.

The XSI Curses standard, Issue 4 describes these functions. The function vwscanw is marked TO BE WITHDRAWN, and is to be replaced by a function vw_scanw using the <stdarg.h> interface. The Single Unix Specification, Version 2 states that vw_scanw is preferred to vwscanw since the latter requires including <varargs.h>, which cannot be used in the same file as <stdarg.h>. This implementation uses <stdarg.h> for both, because that header is included in <curses.h>.

Both XSI and The Single Unix Specification, Version 2 state that these functions return ERR or OK. Since the underlying scanf can return the number of items scanned, and the SVr4 code was documented to use this feature, this is probably an editing error which was introduced in XSI, rather than being done intentionally. Portable applications should only test if the return value is ERR, since the OK value (zero) is likely to be misleading. One possible way to get useful results would be to use a "%n" conversion at the end of the format string to ensure that something was processed.

curses(3X), curs_getstr(3X), curs_printw(3X), scanf(3) #
# The following sets edit modes for GNU EMACS
# Local Variables:
# mode:nroff
# fill-column:79
# End: