X-Git-Url: https://ncurses.scripts.mit.edu/?p=ncurses.git;a=blobdiff_plain;f=man%2Fcurs_scanw.3x;h=870b4b4cb72d5eede887c4f8a1932aef8aa0b936;hp=905b93ba2f2f24321eca546393d0dd6fe53a056e;hb=e5d1530ca229aef94a3c84ad33f8ae89f35c4045;hpb=17c5992a16be94247b83f2bbb9accdd9b7e7bb72

diff --git a/man/curs_scanw.3x b/man/curs_scanw.3x
index 905b93ba..870b4b4c 100644
--- a/man/curs_scanw.3x
+++ b/man/curs_scanw.3x
@@ -1,5 +1,6 @@
 .\"***************************************************************************
-.\" Copyright (c) 1998-2017,2018 Free Software Foundation, Inc.              *
+.\" Copyright 2018-2019,2020 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            *
@@ -26,8 +27,12 @@
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"
-.\" $Id: curs_scanw.3x,v 1.24 2018/07/28 21:14:06 tom Exp $
+.\" $Id: curs_scanw.3x,v 1.27 2020/03/15 00:14:30 tom Exp $
 .TH curs_scanw 3X ""
+.ie \n(.g .ds `` \(lq
+.el       .ds `` ``
+.ie \n(.g .ds '' \(rq
+.el       .ds '' ''
 .de bP
 .ie n  .IP \(bu 4
 .el    .IP \(bu 2
@@ -75,9 +80,47 @@ Applications may use the return value from the \fBscanw\fR, \fBwscanw\fR,
 \fBmvscanw\fR and \fBmvwscanw\fR routines to determine the number of fields
 which were mapped in the call.
 .PP
-Functions with a "mv" prefix first perform a cursor movement using
+Functions with a \*(``mv\*('' prefix first perform a cursor movement using
 \fBwmove\fP, and return an error if the position is outside the window,
 or if the window pointer is null.
+.SH HISTORY
+While \fBscanw\fP was implemented in 4BSD,
+none of the BSD releases used it until 4.4BSD (in a game).
+That early version of curses was before the ANSI C standard.
+It did not use <varargs.h>, though that was available.
+In 1991 (a couple of years after SVr4 was generally available,
+and after the C standard was published),
+other developers updated the library,
+using <stdarg.h> internally in 4.4BSD curses.
+Even with this improvement,
+BSD curses did not use function prototypes (or even declare
+functions) in the <curses.h> header until 1992.
+.PP
+SVr2 documented
+\fBscanw\fP,
+\fBwscanw\fP
+tersely as \*(``scanf through \fIstdscr\fP\*('' and
+tersely as \*(``scanf through \fIwin\fP\*('', respectively.
+.PP
+SVr3 added
+\fBmvscanw\fP, and
+\fBmvwscanw\fP, with a three-line summary saying that they were analogous
+to \fBscanf\fP(3),
+explaining that the string which would be output from \fBscanf\fP(3) would
+instead be output using \fBwaddstr\fP on the given window.
+SVr3 also added \fBvwscanw\fP, saying that the third parameter
+is a \fBva_list\fP, defined in <varargs.h>,
+and referring the reader to the manual pages for \fIvarargs\fP and
+\fIvprintf\fP for detailed descriptions.
+(Because the SVr3 documentation does not mention \fIvscanf\fP,
+that reference to \fIvprintf\fP may not be an error).
+.PP
+SVr4 added no new variations of \fBscanw\fP,
+but provided for using <varargs.h> or <stdarg.h> to define the \fBva_list\fP
+type.
+.PP
+X/Open Curses added \fBvw_scanw\fP to replace \fBvwscanw\fP,
+stating that its \fBva_list\fP definition requires <stdarg.h>.
 .SH PORTABILITY
 In this implementation, \fBvw_scanw\fP and \fBvwscanw\fP are equivalent,
 to support legacy applications.