perl/perl-5.26.1-perl-132245-don-t-try-to-process-a-char-range-with-n.patch

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From dc5c68130b7c8b727e9e792506183c255fc2bc70 Mon Sep 17 00:00:00 2001
From: Tony Cook <tony@develop-help.com>
Date: Thu, 19 Oct 2017 10:46:04 +1100
Subject: [PATCH] (perl #132245) don't try to process a char range with no
preceding char
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
A range like \N{}-0 eventually results in compilation failing, but
before that, get_and_check_backslash_N_name() attempts to treat
the memory before the empty output of \N{} as a character.
Petr Písař: Ported to 5.26.1.
Signed-off-by: Petr Písař <ppisar@redhat.com>
---
t/lib/warnings/toke | 5 +++++
toke.c | 6 +++---
2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/t/lib/warnings/toke b/t/lib/warnings/toke
index fc51d9f..398ee22 100644
--- a/t/lib/warnings/toke
+++ b/t/lib/warnings/toke
@@ -1651,3 +1651,8 @@ Execution of - aborted due to compilation errors.
use utf8;
qw∘foo ∞ ♥ bar∘
EXPECT
+########
+# NAME tr/// range with empty \N{} at the start
+tr//\N{}-0/;
+EXPECT
+Unknown charname '' is deprecated. Its use will be fatal in Perl 5.28 at - line 1.
diff --git a/toke.c b/toke.c
index 6f84d2d..6ee7a68 100644
--- a/toke.c
+++ b/toke.c
@@ -2958,9 +2958,9 @@ S_scan_const(pTHX_ char *start)
/* Here, we don't think we're in a range. If the new character
* is not a hyphen; or if it is a hyphen, but it's too close to
- * either edge to indicate a range, then it's a regular
- * character. */
- if (*s != '-' || s >= send - 1 || s == start) {
+ * either edge to indicate a range, or if we haven't output any
+ * characters yet then it's a regular character. */
+ if (*s != '-' || s >= send - 1 || s == start || d == SvPVX(sv)) {
/* A regular character. Process like any other, but first
* clear any flags */
--
2.13.6