tests: test for the non-UTF8 multi-byte performance regression

Test for the just-fixed performance regression.
With a 100-200x differential, it is reasonable to expect that
a very slow system will be able to complete the designated
task in a few seconds, while with the bug, even a very fast
system would exceed the timeout.
* tests/mb-non-UTF8-performance: New file.
* tests/Makefile.am (TESTS): Add it.
* tests/init.cfg (require_JP_EUC_locale_): New function.

3 files changed, 49 insertions, 0 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 331467ab..4ffea850 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -72,6 +72,7 @@ TESTS =						\
   khadafy					\
   long-line-vs-2GiB-read			\
   max-count-vs-context				\
+  mb-non-UTF8-performance			\
   multibyte-white-space				\
   empty-line-mb					\
   unibyte-bracket-expr				\
diff --git a/tests/init.cfg b/tests/init.cfg
index ee5d537d..5555e2d0 100644
--- a/tests/init.cfg
+++ b/tests/init.cfg
@@ -103,6 +103,22 @@ require_unibyte_locale()
   skip_ 'no unibyte locale found'
 }
 
+require_JP_EUC_locale_()
+{
+  local locale=ja_JP.eucJP
+  path_prepend_ .
+  case $(get-mb-cur-max $locale) in
+    [23])
+        LC_ALL=$locale &&
+        export LC_ALL &&
+        return
+        ;;
+    *) ;;
+  esac
+
+  skip_ "$loc locale not found"
+}
+
 expensive_()
 {
   if test "$RUN_EXPENSIVE_TESTS" != yes; then
diff --git a/tests/mb-non-UTF8-performance b/tests/mb-non-UTF8-performance
new file mode 100755
index 00000000..282f0c4a
--- /dev/null
+++ b/tests/mb-non-UTF8-performance
@@ -0,0 +1,32 @@
+#!/bin/sh
+# grep-2.17 would take nearly 200x longer to run the command below.
+
+# Copyright 2014 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/init.sh"; path_prepend_ ../src
+require_timeout_
+
+fail=0
+
+require_JP_EUC_locale_
+
+yes $(printf '%078d' 0) | head -50000 > in || framework_failure_
+
+# Expect no match, i.e., exit status of 1.  Anything else is an error.
+timeout 4 grep -i foobar in; st=$?
+test $st = 1 || fail=1
+
+Exit $fail