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--- a/src/utils/smallut.cpp
+++ b/src/utils/smallut.cpp
@@ -633,7 +633,6 @@
     for (int i = idx - 1; i >= 0; i--) {
         buf.push_back(rbuf[i]);
     }
-    buf.push_back(0);
 }
 
 void ulltodecstr(unsigned long long val, string& buf)
@@ -691,7 +690,6 @@
 // Convert byte count into unit (KB/MB...) appropriate for display
 string displayableBytes(off_t size)
 {
-    char sizebuf[50];
     const char *unit;
     
     double roundable = 0;
@@ -709,8 +707,7 @@
 	roundable = double(size) / 1E9;
     }
     size = off_t(round(roundable));
-    sprintf(sizebuf, "%lld" "%s", (long long)size, unit);
-    return string(sizebuf);
+    return lltodecstr(size).append(unit);
 }
 
 string breakIntoLines(const string& in, unsigned int ll,