Make tests detect UTF-8 locale with a helper executable

This uses the same utility function that mosh-client/mosh-server do.
This resolves portability issues with the 'locale' command.
This fixes OpenBSD 6.0 and probably Haiku builds.

src/tests/.gitignore

@@ -4,6 +4,7 @@
 /encrypt-decrypt
 /nonce-incr
 /inpty
+/is-utf8-locale
 /*.d/
 *.log
 *.trs

src/tests/Makefile.am

@@ -35,7 +35,7 @@ displaytests = \
 	unicode-later-combining.test \
 	window-resize.test
 
-check_PROGRAMS = ocb-aes encrypt-decrypt base64 nonce-incr inpty
+check_PROGRAMS = ocb-aes encrypt-decrypt base64 nonce-incr inpty is-utf8-locale
 TESTS = ocb-aes encrypt-decrypt base64 nonce-incr local.test $(displaytests)
 XFAIL_TESTS = \
 	e2e-failure.test \
@@ -65,6 +65,10 @@ inpty_SOURCES = inpty.cc
 inpty_CPPFLAGS = -I$(srcdir)/../util
 inpty_LDADD = ../util/libmoshutil.a $(LIBUTIL)
 
+is_utf8_locale_SOURCES = is-utf8-locale.cc
+is_utf8_locale_CPPFLAGS = -I$(srcdir)/../util
+is_utf8_locale_LDADD = ../util/libmoshutil.a $(LIBUTIL)
+
 clean-local: clean-local-check
 .PHONY: clean-local-check
 clean-local-check:

src/tests/e2e-test

@@ -108,10 +108,6 @@ mosh_server()
 }
 
 # main
-if ! set_locale; then
-    test_error "e2e-test: no usable locale\n"
-fi
-
 # Set up environment
 if [ -z "$srcdir" ]; then
     export srcdir=$PWD
@@ -137,10 +133,6 @@ case "$(basename "$0")" in
 	;;
 esac
 
-if ! tmux_check; then
-    test_skipped "tmux unavailable\n"
-fi
-
 if [ $# -lt 2 ]; then
     test_error "not enough args\n"
 fi
@@ -153,6 +145,15 @@ test_args=$@
 test_dir=$(basename "${test_name}").d
 test_script="${test_name}"
 
+tests_dir=$(dirname "${test_name}")
+if ! set_locale "${tests_dir}"; then
+    test_error "e2e-test: no usable locale\n"
+fi
+
+if ! tmux_check; then
+    test_skipped "tmux unavailable\n"
+fi
+
 rm -rf "${test_dir}"
 mkdir "${test_dir}"
 

src/tests/e2e-test-subrs

@@ -60,14 +60,12 @@ chr()
 set_locale()
 {
     # Test for a usable locale.
-    map=$(locale charmap 2>/dev/null)
-    if [ "$map" = "utf-8" ] || [ "$map" = "UTF-8" ]; then
+    if ./is-utf8-locale 2> /dev/null; then
 	return 0
     fi
     # Attempt to find/set a usable locale.
     for i in en_US.UTF-8 en_US.utf8 C.UTF-8; do
-	map="$(env LANG=$i locale charmap 2>/dev/null)"
-	if [ "$map" = "utf-8" ] || [ "$map" = "UTF-8" ]; then
+	if env LANG=$i ./is-utf8-locale 2> /dev/null; then
 	    export LANG=$i LC_ALL=''
 	    return 0
 	fi

src/tests/is-utf8-locale.cc

@@ -0,0 +1,45 @@
+/*
+    Mosh: the mobile shell
+    Copyright 2012 Keith Winstein
+
+    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/>.
+
+    In addition, as a special exception, the copyright holders give
+    permission to link the code of portions of this program with the
+    OpenSSL library under certain conditions as described in each
+    individual source file, and distribute linked combinations including
+    the two.
+
+    You must obey the GNU General Public License in all respects for all
+    of the code used other than OpenSSL. If you modify file(s) with this
+    exception, you may extend this exception to your version of the
+    file(s), but you are not obligated to do so. If you do not wish to do
+    so, delete this exception statement from your version. If you delete
+    this exception statement from all source files in the program, then
+    also delete it here.
+*/
+
+#include <stdio.h>
+
+#include "locale_utils.h"
+
+int main( int argc __attribute__(( unused )), char **argv __attribute__(( unused )))
+{
+  set_native_locale();
+  if ( !is_utf8_locale() ) {
+    fprintf( stderr, "not a UTF-8 locale\n" );
+    return 1;
+  }
+  return 0;
+}