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Diffstat (limited to 'upstream/fedora-rawhide/man3/curs_scanw.3x')
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diff --git a/upstream/fedora-rawhide/man3/curs_scanw.3x b/upstream/fedora-rawhide/man3/curs_scanw.3x new file mode 100644 index 00000000..cf1977ac --- /dev/null +++ b/upstream/fedora-rawhide/man3/curs_scanw.3x @@ -0,0 +1,250 @@ +.\"*************************************************************************** +.\" Copyright 2018-2022,2023 Thomas E. Dickey * +.\" Copyright 1998-2010,2017 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 1.47 2023/12/23 14:41:50 tom Exp $ +.TH curs_scanw 3X 2023-12-23 "ncurses 6.4" "Library calls" +.ie \n(.g \{\ +.ds `` \(lq +.ds '' \(rq +.\} +.el \{\ +.ie t .ds `` `` +.el .ds `` "" +.ie t .ds '' '' +.el .ds '' "" +.\} +. +.de bP +.ie n .IP \(bu 4 +.el .IP \(bu 2 +.. +.SH NAME +\fB\%scanw\fP, +\fB\%wscanw\fP, +\fB\%mvscanw\fP, +\fB\%mvwscanw\fP, +\fB\%vwscanw\fP, +\fB\%vw_scanw\fP \- +read formatted input from a \fIcurses\fR window +.SH SYNOPSIS +.nf +\fB#include <curses.h> +.PP +\fBint scanw(const char *\fIfmt\fP, ...); +\fBint wscanw(WINDOW *\fIwin\fP, const char *\fIfmt\fP, ...); +\fBint mvscanw(int \fIy\fP, int \fIx\fP, const char *\fIfmt\fP, ...); +\fBint mvwscanw(WINDOW *\fIwin\fP, int \fIy\fP, int \fIx\fP, const char *\fIfmt\fP, ...); +.PP +\fBint vw_scanw(WINDOW *\fIwin\fP, const char *\fIfmt\fP, va_list \fIvarglist\fP); +.PP +\fI/* obsolete */\fP +\fBint vwscanw(WINDOW *\fIwin\fP, const char *\fIfmt\fP, va_list \fIvarglist\fP); +.fi +.SH DESCRIPTION +\fB\%scanw\fP, +\fB\%wscanw\fP, +\fB\%mvscanw\fP, +and +\fB\%mvwscanw\fP +are analogous to \fI\%scanf\fP(3). +In effect, +they call \fB\%wgetstr\fP(3X) with +.I win +(or +.BR \%stdscr ) +as its first argument, +then attempt conversion of the resulting string with \fI\%vsscanf\fP(3). +Fields in the string that do not map to a variable in the \fIfmt\fP +parameter are discarded. +.PP +\fB\%vwscanw\fP +and +\fB\%vw_scanw\fP are analogous to \fI\%vscanf\fP(3), +and perform a \fB\%wscanw\fP using a variable argument list. +The third argument is a \fI\%va_list\fP, +a pointer to a list of arguments, +as defined in \fI\%stdarg.h\fP. +.SH RETURN VALUE +These functions return +.B ERR +upon failure and otherwise a count of successful conversions; +this quantity may be zero. +.PP +In +.I \%ncurses, +failure occurs if \fI\%vsscanf\fP(3) returns +\fBEOF\fP, +or if the window pointer +.I win +is null. +.PP +Functions with a \*(``mv\*('' prefix first perform a cursor movement +using \fB\%wmove\fP, +and fail if the position is outside the window. +.SH NOTES +No wide character counterpart functions are defined by the +\*(``wide\*('' +.I \%ncurses +configuration nor by any standard. +They are unnecessary: +to retrieve and convert a wide-character string from a +.I curses +terminal keyboard, +use these functions with the \fI\%scanf\fP(3) conversions \*(``%lc\*('' +and \*(``%ls\*('' for wide characters and strings, +respectively. +.PP +.I \%ncurses +implements \fI\%vsscanf\fP(3) internally if it is unavailable when the +library is configured. +.SH PORTABILITY +X/Open Curses, Issue 4, describes these functions. +It specifies no error conditions for them. +.PP +.I \%ncurses +defines \fB\%vw_scanw\fP and \fB\%vwscanw\fP identically to support +legacy applications. +However, +the latter is obsolete. +.bP +X/Open Curses, Issue 4, Version 2 (1996), +marked \fB\%vwscanw\fP as requiring \fI\%varargs.h\fP and +\*(``TO BE WITHDRAWN\*('', +and specified \fB\%vw_scanw\fP using the \fI\%stdarg.h\fP interface. +.bP +X/Open Curses, Issue 5, Draft 2 +(December 2007) marked \fB\%vwscanw\fP (along with +\fB\%vwscanw\fP and the \fItermcap\fP interface) as withdrawn. +After incorporating review comments, +this became +X/Open Curses, Issue 7 (2009). +.bP +.I \%ncurses +provides \fB\%vwscanw\fP, +but marks it as deprecated. +.PP +X/Open Curses Issues 4 and 7 both state that these functions return +\fBERR\fP or \fBOK\fP. +This is likely an erratum. +.bP +Since the underlying \fI\%scanf\fP(3) returns the number of successful +conversions, +and SVr4 +.I curses +was documented to use this feature, +this may have been an editorial solecism introduced by X/Open, +rather than an intentional change. +.bP +This implementation retains compatibility with SVr4 +.I curses. +As of 2018, +NetBSD +.I curses +also returns the number of successful conversions. +Both +.I \%ncurses\fP +and NetBSD +.I curses +call \fI\%vsscanf\fP(3) to scan the string, +which returns \fBEOF\fP on error. +.bP +Portable applications should test only if the return value is \fBERR\fP, +and not compare it to \fBOK\fP, +since that value (zero) might be misleading. +.IP +One portable way to get useful results would be to use a \*(``%n\*('' +conversion at the end of the format string, +and check the value of the corresponding variable to determine how many +conversions succeeded. +.SH HISTORY +\fB\%scanw\fP was implemented in 4BSD +(November 1980); +.\" https://minnie.tuhs.org/cgi-bin/utree.pl?file=4BSD/usr/src/lib/\ +.\" libcurses/scanw.c +that early version of +.I curses +preceded the ANSI C standard of 1989. +The function was unused in Berkeley distributions for over ten years, +until 4.4BSD, +which employed it in a game. +The 4BSD \fB\%scanw\fP did not use \fI\%varargs.h\fP, +though that had been available since Seventh Edition Unix (1979). +.\" https://minnie.tuhs.org/cgi-bin/utree.pl?file=V7/usr/include/\ +.\" varargs.h +In 1991 +(a couple of years after SVr4 was generally available, +and after the C standard was published), +other developers updated the library, +using \fI\%stdarg.h\fP internally in 4.4BSD +.I curses. +Even with this improvement, +BSD +.I curses +did not use function prototypes +(nor even declare functions) +in \fI\%curses.h\fP until 1992. +.PP +SVr2 (1984) documented \fB\%scanw\fP and \fB\%wscanw\fP tersely as +\*(``scanf through \fB\%stdscr\fP\*('' and +\*(``scanf through \fIwin\fP\*('', +respectively. +.PP +SVr3 (1987) added +\fB\%mvscanw\fP, and +\fB\%mvwscanw\fP, stating +.RS +.PP +\*(``[t]hese routines correspond to \fIscanf\fP(3S), +as do their arguments and return values. +\fB\%wgetstr\fP() is called on the window, +and the resulting line is used as input for the scan.\*('' +.RE +.PP +SVr3 also implemented \fB\%vwscanw\fP, +describing its third parameter as a \fI\%va_list\fP, +defined in \fI\%varargs.h\fP, +and referred the reader to the manual pages for \fI\%varargs\fP and +\fI\%vprintf\fP for detailed descriptions. +(Because the SVr3 documentation does not mention \fI\%vscanf\fP, +the reference to \fI\%vprintf\fP might not be an error). +.PP +SVr4 (1989) introduced no new variations of \fI\%scanw\fP, +but provided for using either \fI\%varargs.h\fP or \fI\%stdarg.h\fP to +define the \fI\%va_list\fP type. +.\" either header declares "va_list", but only one can be used +.PP +X/Open Curses, Issue 4 (1995), +defined \fI\%vw_scanw\fP to replace \fI\%vwscanw\fP, +stating that its \fI\%va_list\fP type is defined in \fI\%stdarg.h\fP. +.SH SEE ALSO +\fB\%curses\fP(3X), +\fB\%curs_getstr\fP(3X), +\fB\%curs_printw\fP(3X), +\fB\%scanf\fP(3), +\fB\%vscanf\fP(3) |