perl/perl-5.27.1-PATCH-perl-131646-Assertion-fail-UTF-8-error-msg.patch

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From 1d5030e143202c1e963e1fc91eb6f3afaa2df83e Mon Sep 17 00:00:00 2001
From: Karl Williamson <khw@cpan.org>
Date: Sat, 24 Jun 2017 11:47:19 -0600
Subject: [PATCH] PATCH: [perl #131646] Assertion fail UTF-8 error msg
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Instead of croaking with a proper message, creating the message creates
an assertion failure.
The cause was that there were two ++ operators on a string, so one
should subtract 2 to get to the string start, but only 1 was being
subtracted.
This is a 5.26 regression, but not terribly consequential, as the
program is about to die, but it is a trivial fix that allows the reason
the crash is happening to be properly displayed to aid debugging, so I'm
adding my vote for it for 5.26.1.
Signed-off-by: Petr Písař <ppisar@redhat.com>
---
t/lib/warnings/utf8 | 13 +++++++++++++
utf8.c | 2 +-
2 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/t/lib/warnings/utf8 b/t/lib/warnings/utf8
index a4dfb12..a26bbed 100644
--- a/t/lib/warnings/utf8
+++ b/t/lib/warnings/utf8
@@ -749,3 +749,16 @@ BEGIN{
{};$^H=eval'2**400'}<7D>
EXPECT
Malformed UTF-8 character: \xc2\x0a (unexpected non-continuation byte 0x0a, immediately after start byte 0xc2; need 2 bytes, got 1) at - line 11.
+########
+# NAME [perl #131646]
+BEGIN{
+ if (ord('A') == 193) {
+ print "SKIPPED\n# ebcdic platforms generates different Malformed UTF-8 warnings.";
+ exit 0;
+ }
+}
+no warnings;
+use warnings 'utf8';
+for(uc 0..t){0~~pack"UXp>",exp}
+EXPECT
+Malformed UTF-8 character: \xc2\x00 (unexpected non-continuation byte 0x00, immediately after start byte 0xc2; need 2 bytes, got 1) in smart match at - line 9.
diff --git a/utf8.c b/utf8.c
index 68ac640..2ee701a 100644
--- a/utf8.c
+++ b/utf8.c
@@ -1875,7 +1875,7 @@ Perl_bytes_cmp_utf8(pTHX_ const U8 *b, STRLEN blen, const U8 *u, STRLEN ulen)
/* diag_listed_as: Malformed UTF-8 character%s */
Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8),
"%s %s%s",
- unexpected_non_continuation_text(u - 1, 2, 1, 2),
+ unexpected_non_continuation_text(u - 2, 2, 1, 2),
PL_op ? " in " : "",
PL_op ? OP_DESC(PL_op) : "");
return -2;
--
2.9.4