btrfs-progs: move prefixcmp helper to utils

Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/utils.c b/utils.c
index 5aab60d3..d2489e70 100644
--- a/utils.c
+++ b/utils.c
@@ -2305,6 +2305,15 @@ int string_is_numerical(const char *str)
 	return 1;
 }
 
+int prefixcmp(const char *str, const char *prefix)
+{
+	for (; ; str++, prefix++)
+		if (!*prefix)
+			return 0;
+		else if (*str != *prefix)
+			return (unsigned char)*prefix - (unsigned char)*str;
+}
+
 /* Subvolume helper functions */
 /*
  * test if name is a correct subvolume name