macro: add a macro to test whether a value is in a specified list

Introduce IN_SET() macro to nicely check whether a value a is one of a
few listed values.

This makes writing this:

        if (a == 1 || a == 7 || a == 8 || a == 9)

nicer, by allowing this:

        if (IN_SET(a, 1, 7, 8, 9))

This is particularly useful for state machine enums.

1 files changed, 11 insertions, 0 deletions

diff --git a/src/test/test-util.c b/src/test/test-util.c
index afc3247ffd..05b2294e24 100644
--- a/src/test/test-util.c
+++ b/src/test/test-util.c
@@ -568,6 +568,16 @@ static void test_get_files_in_directory(void) {
         assert_se(get_files_in_directory(".", NULL) >= 0);
 }
 
+static void test_in_set(void) {
+        assert_se(IN_SET(1, 1));
+        assert_se(IN_SET(1, 1, 2, 3, 4));
+        assert_se(IN_SET(2, 1, 2, 3, 4));
+        assert_se(IN_SET(3, 1, 2, 3, 4));
+        assert_se(IN_SET(4, 1, 2, 3, 4));
+        assert_se(!IN_SET(0, 1));
+        assert_se(!IN_SET(0, 1, 2, 3, 4));
+}
+
 int main(int argc, char *argv[]) {
         test_streq_ptr();
         test_first_word();
@@ -604,6 +614,7 @@ int main(int argc, char *argv[]) {
         test_split_pair();
         test_fstab_node_to_udev_node();
         test_get_files_in_directory();
+        test_in_set();
 
         return 0;
 }