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s-wchcnv.adb: Document handling of [ on output (we do not change this to ["5B"] and the new...

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2006-02-17  Robert Dewar  <dewar@adacore.com>

	* s-wchcnv.adb: Document handling of [ on output (we do not change
	this to ["5B"] and the new comments say why not.

	* gnat_ugn.texi: 
	Add note for -gnatVo that this now includes the cases of type
	conversions and qualified expressions.
	Add comments on handling of brackets encoding for Text_IO

From-SVN: r111198
This commit is contained in:
Robert Dewar 2006-02-17 17:08:58 +01:00 committed by Arnaud Charlet
parent dc6b9ba2d1
commit f813ac73e9
2 changed files with 20 additions and 2 deletions
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3
gcc/ada/gnat_ugn.texi
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@ -5275,7 +5275,8 @@ Arguments for predefined operators and attributes are validity checked.
This includes all operators in package @code{Standard},
the shift operators defined as intrinsic in package @code{Interfaces}
and operands for attributes such as @code{Pos}. Checks are also made
on individual component values for composite comparisons.
on individual component values for composite comparisons, and on the
expressions in type conversions and qualified expressions.
@item -gnatVp
@emph{Validity checks for parameters.}

19
gcc/ada/s-wchcnv.adb
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@ -6,7 +6,7 @@
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2005, Free Software Foundation, Inc. --
-- Copyright (C) 1992-2006, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
@ -411,9 +411,26 @@ package body System.WCh_Cnv is
end if;
when WCEM_Brackets =>
-- Values in the range 0-255 are directly output. Note that there
-- is some issue with [ (16#5B#] since this will cause confusion
-- if the resulting string is interpreted using brackets encoding.
-- One possibility would be to always output [ as ["5B"] but in
-- practice this is undesirable, since for example normal use of
-- Wide_Text_IO for output (much more common than input), really
-- does want to be able to say something like
-- Put_Line ("Start of output [first run]");
-- and have it come out as intended, rather than contaminated by
-- a ["5B"] sequence in place of the left bracket.
if Val < 256 then
Out_Char (Character'Val (Val));
-- Otherwise use brackets notation for vales greater than 255
else
Out_Char ('[');
Out_Char ('"');