3 files changed, 84 insertions, 0 deletions

diff --git a/src/shared/strv.c b/src/shared/strv.c
index f86dddaf81..e418312d52 100644
--- a/src/shared/strv.c
+++ b/src/shared/strv.c
@@ -524,6 +524,16 @@ char **strv_uniq(char **l) {
         return l;
 }
 
+bool strv_is_uniq(char **l) {
+        char **i;
+
+        STRV_FOREACH(i, l)
+                if (strv_find(i+1, *i))
+                        return false;
+
+        return true;
+}
+
 char **strv_remove(char **l, const char *s) {
         char **f, **t;
 
@@ -664,3 +674,21 @@ int strv_extendf(char ***l, const char *format, ...) {
 
         return strv_consume(l, x);
 }
+
+char **strv_reverse(char **l) {
+        unsigned n, i;
+
+        n = strv_length(l);
+        if (n <= 1)
+                return l;
+
+        for (i = 0; i < n / 2; i++) {
+                char *t;
+
+                t = l[i];
+                l[i] = l[n-1-i];
+                l[n-1-i] = t;
+        }
+
+        return l;
+}
diff --git a/src/shared/strv.h b/src/shared/strv.h
index 9e5b1bb8b0..e385bf73b8 100644
--- a/src/shared/strv.h
+++ b/src/shared/strv.h
@@ -52,6 +52,7 @@ int strv_consume_prepend(char ***l, char *value);
 
 char **strv_remove(char **l, const char *s);
 char **strv_uniq(char **l);
+bool strv_is_uniq(char **l);
 
 bool strv_equal(char **a, char **b);
 
@@ -141,3 +142,5 @@ void strv_print(char **l);
                 _l ++;                                       \
                 _l[0];                                       \
         }))
+
+char **strv_reverse(char **l);
diff --git a/src/test/test-strv.c b/src/test/test-strv.c
index f343eab7c6..5ae929c3f8 100644
--- a/src/test/test-strv.c
+++ b/src/test/test-strv.c
@@ -491,6 +491,57 @@ static void test_strv_equal(void) {
         assert_se(!strv_equal(b, NULL));
 }
 
+static void test_strv_is_uniq(void) {
+        _cleanup_strv_free_ char **a = NULL, **b = NULL, **c = NULL, **d = NULL;
+
+        a = strv_new(NULL, NULL);
+        assert_se(a);
+        assert_se(strv_is_uniq(a));
+
+        b = strv_new("foo", NULL);
+        assert_se(b);
+        assert_se(strv_is_uniq(b));
+
+        c = strv_new("foo", "bar", NULL);
+        assert_se(c);
+        assert_se(strv_is_uniq(c));
+
+        d = strv_new("foo", "bar", "waldo", "bar", "piep", NULL);
+        assert_se(d);
+        assert_se(!strv_is_uniq(d));
+}
+
+static void test_strv_reverse(void) {
+        _cleanup_strv_free_ char **a = NULL, **b = NULL, **c = NULL, **d = NULL;
+
+        a = strv_new(NULL, NULL);
+        assert_se(a);
+
+        strv_reverse(a);
+        assert_se(strv_isempty(a));
+
+        b = strv_new("foo", NULL);
+        assert_se(b);
+        strv_reverse(b);
+        assert_se(streq_ptr(b[0], "foo"));
+        assert_se(streq_ptr(b[1], NULL));
+
+        c = strv_new("foo", "bar", NULL);
+        assert_se(c);
+        strv_reverse(c);
+        assert_se(streq_ptr(c[0], "bar"));
+        assert_se(streq_ptr(c[1], "foo"));
+        assert_se(streq_ptr(c[2], NULL));
+
+        d = strv_new("foo", "bar", "waldo", NULL);
+        assert_se(d);
+        strv_reverse(d);
+        assert_se(streq_ptr(d[0], "waldo"));
+        assert_se(streq_ptr(d[1], "bar"));
+        assert_se(streq_ptr(d[2], "foo"));
+        assert_se(streq_ptr(d[3], NULL));
+}
+
 int main(int argc, char *argv[]) {
         test_specifier_printf();
         test_strv_foreach();
@@ -545,6 +596,8 @@ int main(int argc, char *argv[]) {
         test_strv_push_prepend();
         test_strv_push();
         test_strv_equal();
+        test_strv_is_uniq();
+        test_strv_reverse();
 
         return 0;
 }