From a3a8262bf6e2acbb1b61cc25be073713e183c766 Mon Sep 17 00:00:00 2001
From: Brandon Casey <drafnel@gmail.com>
Date: Sun, 7 Jun 2009 19:25:58 -0500
Subject: [PATCH] git-send-email.perl: improve detection of MIME encoded-words

According to rfc2047, an encoded word has the following form:

   encoded-word = "=?" charset "?" encoding "?" encoded-text "?="

   charset = token

   encoding = token

   token = <Any CHAR except SPACE, CTLs, and especials>

   especials = "(" / ")" / "<" / ">" / "@" / "," / ";" / ":" / "
               <"> / "/" / "[" / "]" / "?" / "." / "="

   encoded-text = <Any printable ASCII character other than "?"
                     or SPACE>

And rfc822 defines CHARs and CTLs as:

    CHAR = <any ASCII character> ; (  0-177,  0.-127.)

    CTL = <any ASCII control     ; (  0- 37,  0.- 31.)
           character and DEL>    ; (    177,     127.)

The original code only detected rfc2047 encoded strings when the charset
was UTF-8.  This patch generalizes the matching expression and breaks the
check for an rfc2047 encoded string into its own function.  There's no real
functional change, since any properly rfc2047 encoded string would have
fallen through the remaining 'if' statements and been returned unchanged.

Signed-off-by: Brandon Casey <drafnel@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 git-send-email.perl | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/git-send-email.perl b/git-send-email.perl
index 3d6a98218..8a1a40d18 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -772,6 +772,14 @@ sub quote_rfc2047 {
 	return $_;
 }
 
+sub is_rfc2047_quoted {
+	my $s = shift;
+	my $token = '[^][()<>@,;:"\/?.= \000-\037\177-\377]+';
+	my $encoded_text = '[!->@-~]+';
+	length($s) <= 75 &&
+	$s =~ m/^(?:"[[:ascii:]]*"|=\?$token\?$token\?$encoded_text\?=)$/o;
+}
+
 # use the simplest quoting being able to handle the recipient
 sub sanitize_address
 {
@@ -783,7 +791,7 @@ sub sanitize_address
 	}
 
 	# if recipient_name is already quoted, do nothing
-	if ($recipient_name =~ /^("[[:ascii:]]*"|=\?utf-8\?q\?.*\?=)$/) {
+	if (is_rfc2047_quoted($recipient_name)) {
 		return $recipient;
 	}
 
-- 
2.30.2