grep branch, master, updated. v2.18-21-g5cf924c

[Paul Eggert]

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http://git.savannah.gnu.org/cgit/grep.git/commit/?id=5cf924cd2dc5221348c8f087f8a8507dc5ff7b54


commit 5cf924cd2dc5221348c8f087f8a8507dc5ff7b54
Author: Paul Eggert <address@hidden>
Date:   Thu Mar 6 13:16:48 2014 -0800

    doc: do not overpromise --ignore-case's behavior
    
    * NEWS: Omit vague statement about titlecase that could be
    misinterpreted, and is more trouble than it's worth.
    * doc/grep.texi: Add @documentencoding.  Fix copyright range to
    use endash not hyphen.
    (Matching Control): Do not overpromise what --ignore-case will do.
    Give examples of corner cases where the documentation does not
    specify behavior.

diff --git a/NEWS b/NEWS
index eaa3c96..2a62e7b 100644
--- a/NEWS
+++ b/NEWS
@@ -20,8 +20,6 @@ GNU grep NEWS                                    -*- outline 
-*-
   per the documentation on how grep's -w works.
 
   grep -i no longer mishandles patterns containing titlecase characters.
-  A pattern character now matches its lowercase and uppercase
-  counterparts, even when they both differ from the pattern.
   For example, in a locale containing the titlecase character
   'Lj' (U+01C8 LATIN CAPITAL LETTER L WITH SMALL LETTER J),
   'grep -i Lj' now matches both 'LJ' (U+01C7 LATIN CAPITAL LETTER LJ)
diff --git a/doc/grep.texi b/doc/grep.texi
index b9d6ec5..f631f03 100644
--- a/doc/grep.texi
+++ b/doc/grep.texi
@@ -13,10 +13,12 @@
 @syncodeindex vr cp
 @c %**end of header
 
address@hidden UTF-8
+
 @copying
 This manual is for @command{grep}, a pattern matching engine.
 
-Copyright @copyright{} 1999-2002, 2005, 2008-2014 Free Software Foundation,
+Copyright @copyright{} 1999--2002, 2005, 2008--2014 Free Software Foundation,
 Inc.
 
 @quotation
@@ -193,8 +195,19 @@ The empty file contains zero patterns, and therefore 
matches nothing.
 @opindex -y
 @opindex --ignore-case
 @cindex case insensitive search
-Ignore case distinctions, so that a pattern character matches not only
-itself in the text, but also its lowercase and uppercase counterparts, if any.
+Ignore case distinctions, so that characters that differ only in case
+match each other.  Although this is straightforward when letters
+differ in case only via lowercase-uppercase pairs, the behavior is
+unspecified in other situations.  For example, uppercase ``S'' has an
+unusual lowercase counterpart ``Å¿'' (Unicode character U+017F, LATIN
+SMALL LETTER LONG S) in many locales, and it is unspecified whether
+this unusual character matches ``S'' or ``s'' even though uppercasing
+it yields ``S''.  Another example: the lowercase German letter ``ß''
+(U+00DF, LATIN SMALL LETTER SHARP S) is normally capitalized as the
+two-character string ``SS'' but it does not match ``SS'', and it might
+not match the uppercase letter ``ẞ'' (U+1E9E, LATIN CAPITAL LETTER
+SHARP S) even though lowercasing the latter yields the former.
+
 @option{-y} is an obsolete synonym that is provided for compatibility.
 (@option{-i} is specified by POSIX.)
 

-----------------------------------------------------------------------

Summary of changes:
 NEWS          |    2 --
 doc/grep.texi |   19 ++++++++++++++++---
 2 files changed, 16 insertions(+), 5 deletions(-)


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