Added help message & fixed blocksize bug

The bug was caused by integer overflow with too large precisions.

1 files changed, 12 insertions, 0 deletions

diff --git a/intmath.c b/intmath.c
index 9e1f3ed..a4738b9 100644
--- a/intmath.c
+++ b/intmath.c
@@ -14,6 +14,18 @@ int int_pown(unsigned int base, unsigned int exp) {
 	return res;
 }
 
+int int_logn(unsigned int base, unsigned int a) {
+	unsigned int exp = 1;
+	int res = (int) base;
+	int lastres = res - 1;
+	while ((res < a) && (lastres < res)) {
+		lastres = res;
+		res *= base;
+		exp++;
+	}
+	return exp;
+}
+
 unsigned long long ull_pown(unsigned int base, unsigned int exp) {
 	unsigned long long res = 1;
 	while (exp > 0) {