tests: ls: check C1 control char escaping in UTF-8 quoting

* tests/ls/quoting-utf8.sh: A non-ASCII C1 control character (U+0085
NEL) is not printable, so locale/clocale quoting must octal-escape its
bytes (\302\205) rather than emit them literally.  Add a file named
with U+0085 and verify the escaped form for both styles.
gap identified here: https://github.com/uutils/coreutils/pull/13150

Link: https://github.com/coreutils/coreutils/pull/306

diff --git a/tests/ls/quoting-utf8.sh b/tests/ls/quoting-utf8.sh
index a89c0db317b9d3bcd56e78edfe2915d0b405670d..8b15c38f521f1aaa495c7bda6dec7ed7d5711a0d 100755 (executable)
--- a/tests/ls/quoting-utf8.sh
+++ b/tests/ls/quoting-utf8.sh
@@ -24,6 +24,10 @@ test "$(LC_ALL=en_US.UTF-8 locale charmap 2>/dev/null)" = UTF-8 ||
 
 touch 'hello world' "it's" 'say "hi"' 'tab     here' || framework_failure_
 
+# A non-ASCII (C1) control character: U+0085 NEL = \xc2\x85.
+nel=$(printf 'nel\302\205here')
+touch "$nel" || framework_failure_
+
 # Note we use en_US as there are no translations provided,
 # and so locale quoting for UTF-8 is hardcoded to these quoting characters:
 # U+2018 = \xe2\x80\x98 (LEFT SINGLE QUOTATION MARK)
@@ -56,6 +60,10 @@ for style in locale clocale; do
   # Control characters should still be C-escaped
   grep "tab\\\\there" out_${style}_utf8 > /dev/null 2>&1 \
     || { echo "$style UTF-8: tab should be escaped as \\t"; fail=1; }
+
+  # Non-ASCII (C1) control characters are octal-escaped by byte
+  grep "^${lq}nel\\\\302\\\\205here${rq}\$" out_${style}_utf8 > /dev/null 2>&1 \
+    || { echo "$style UTF-8: U+0085 should be octal-escaped"; fail=1; }
 done
 
 # In C locale, locale uses ASCII single quotes, clocale uses ASCII double quotes