Add count_digit() function in utils.h to help calculate filename with
ino suffix.
Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com>
---
Changelog:
v4:
Newly introduced.
---
utils.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/utils.h b/utils.h
index 289e86b..f68d6d8 100644
--- a/utils.h
+++ b/utils.h
@@ -161,4 +161,22 @@ static inline u64 btrfs_min_dev_size(u32 leafsize)
int find_next_key(struct btrfs_path *path, struct btrfs_key *key);
+/*
+ * Get the length of the string converted from a u64 number.
+ *
+ * Result is equal to log10(num) + 1, but without the use of math library.
+ */
+static inline int count_digit(u64 num)
+{
+ int ret = 0;
+
+ if (num == 0)
+ return 1;
+ while (num > 0) {
+ ret++;
+ num /= 10;
+ }
+ return ret;
+}
+
#endif
--
2.1.3
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