btrfs-progs: introduce test_issubvolname() for simplicity

There are many duplicated codes to check if the given string is
correct subvolume name. Introduce test_issubvolname() for this
purpose for simplicity.

Signed-off-by: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
Cc: David Sterba <dsterba@suse.cz>
Cc: Mike Fleetwood <mike.fleetwood@googlemail.com>
Signed-off-by: David Sterba <dsterba@suse.cz>

1 files changed, 12 insertions, 0 deletions

diff --git a/utils.c b/utils.c
index 4f17583b..d2397e85 100644
--- a/utils.c
+++ b/utils.c
@@ -2405,3 +2405,15 @@ int test_minimum_size(const char *file, u32 leafsize)
 	close(fd);
 	return 0;
 }
+
+/*
+ * test if name is a correct subvolume name
+ * this function return
+ * 0-> name is not a correct subvolume name
+ * 1-> name is a correct subvolume name
+ */
+int test_issubvolname(const char *name)
+{
+	return name[0] != '\0' && !strchr(name, '/') &&
+		strcmp(name, ".") && strcmp(name, "..");
+}