update

LiveCD/VTOY/ventoy/disksize.c

@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef unsigned long long UINT64;
+
+int GetHumanReadableGBSize(UINT64 SizeBytes)
+{
+    int i;
+    int Pow2 = 1;
+    double Delta;
+    double GB = SizeBytes * 1.0 / 1000 / 1000 / 1000;
+
+    for (i = 0; i < 12; i++)
+    {
+        if (Pow2 > GB)
+        {
+            Delta = (Pow2 - GB) / Pow2;
+        }
+        else
+        {
+            Delta = (GB - Pow2) / Pow2;
+        }
+
+        if (Delta < 0.05)
+        {
+            return Pow2;
+        }
+
+        Pow2 <<= 1;
+    }
+
+    return (int)GB;
+}
+
+int main(int argc, char **argv)
+{
+    UINT64 value = strtoul(argv[1], NULL, 10);
+    
+    printf("%d", GetHumanReadableGBSize(value * 512));
+    
+    return 0;
+}