core: fix dependency parsing

3d793d29059a7ddf5282efa6b32b953c183d7a4d broke parsing of unit file
names that include backslashes, as extract_first_word() strips those.
Fix this, by introducing a new EXTRACT_RETAIN_ESCAPE flag which disables
looking at any flags, thus being compatible with the classic
FOREACH_WORD() behaviour.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/test/test-extract-word.c b/src/test/test-extract-word.c
index 09698c07c7..65d3a0a96e 100644
--- a/src/test/test-extract-word.c
+++ b/src/test/test-extract-word.c
@@ -325,6 +325,18 @@ static void test_extract_first_word(void) {
         assert_se(extract_first_word(&p, &t, ":", EXTRACT_DONT_COALESCE_SEPARATORS) == 0);
         assert_se(!t);
         assert_se(!p);
+
+        p = "foo\\xbar";
+        assert_se(extract_first_word(&p, &t, NULL, 0) > 0);
+        assert_se(streq(t, "fooxbar"));
+        free(t);
+        assert_se(p == NULL);
+
+        p = "foo\\xbar";
+        assert_se(extract_first_word(&p, &t, NULL, EXTRACT_RETAIN_ESCAPE) > 0);
+        assert_se(streq(t, "foo\\xbar"));
+        free(t);
+        assert_se(p == NULL);
 }
 
 static void test_extract_first_word_and_warn(void) {