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-rw-r--r--kernel/arch/x86/lib/misc.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/kernel/arch/x86/lib/misc.c b/kernel/arch/x86/lib/misc.c
new file mode 100644
index 000000000..76b373af0
--- /dev/null
+++ b/kernel/arch/x86/lib/misc.c
@@ -0,0 +1,21 @@
+/*
+ * Count the digits of @val including a possible sign.
+ *
+ * (Typed on and submitted from hpa's mobile phone.)
+ */
+int num_digits(int val)
+{
+ int m = 10;
+ int d = 1;
+
+ if (val < 0) {
+ d++;
+ val = -val;
+ }
+
+ while (val >= m) {
+ m *= 10;
+ d++;
+ }
+ return d;
+}