tests: work around AIX 7.2 sh printf bug

AIX 7.2 /bin/sh’s printf command mishandles octal escapes
in multibyte locales: it treats them as characters, not bytes.
* tests/backslash-s-vs-invalid-multitype, tests/encoding-error:
Use the C locale when employing the printf command with an octal
escape that AIX 7.2 sh might mishandle.
* tests/init.sh (setup_): Use the C locale for tests.
This has the side benefit of making them more reproducible.

3 files changed, 7 insertions, 5 deletions

diff --git a/tests/backslash-s-vs-invalid-multitype b/tests/backslash-s-vs-invalid-multitype
index 82c6e631..bfa44621 100755
--- a/tests/backslash-s-vs-invalid-multitype
+++ b/tests/backslash-s-vs-invalid-multitype
@@ -11,11 +11,11 @@
 
 require_en_utf8_locale_
 
+printf '\202\n' > in || framework_failure_
+
 LC_ALL=en_US.UTF-8
 export LC_ALL
 
-printf '\202\n' > in || framework_failure_
-
 fail=0
 grep '^\S$' in > out-S && fail=1
 compare /dev/null out-S || fail=1
diff --git a/tests/encoding-error b/tests/encoding-error
index 1987f09c..508206d0 100755
--- a/tests/encoding-error
+++ b/tests/encoding-error
@@ -11,14 +11,14 @@
 
 require_en_utf8_locale_
 
-LC_ALL=en_US.UTF-8
-export LC_ALL
-
 printf 'Alfred Jones\n' > a || framework_failure_
 printf 'John Smith\n' >j || framework_failure_
 printf 'Pedro P\351rez\n' >p || framework_failure_
 cat a p j >in || framework_failure_
 
+LC_ALL=en_US.UTF-8
+export LC_ALL
+
 fail=0
 
 grep '^A' in >out || fail=1
diff --git a/tests/init.sh b/tests/init.sh
index 8ca5c905..a0ee8a9b 100644
--- a/tests/init.sh
+++ b/tests/init.sh
@@ -378,6 +378,8 @@ testdir_prefix_ () { printf gt; }
 # Set up the environment for the test to run in.
 setup_ ()
 {
+  export LC_ALL=C
+
   if test "$VERBOSE" = yes; then
     # Test whether set -x may cause the selected shell to corrupt an
     # application's stderr.  Many do, including zsh-4.3.10 and the /bin/sh