enh: compatibility between getFileNamePrefix and tsdbTFileName

source/dnode/vnode/src/tsdb/tsdbFile.c

@@ -112,7 +112,10 @@ static char* getFileNamePrefix(STsdb *pTsdb, SDiskID did, int32_t fid, uint64_t
   p += titoa(TD_VID(pTsdb->pVnode), 10, p);
   *(p++) = 'f';
 
-  p += titoa(fid, 10, p);
+  if (fid < 0) {
+    *(p++) = '-';
+  }
+  p += titoa((fid < 0) ? -fid : fid, 10, p);
 
   memcpy(p, "ver", 3);
   p += 3;

source/util/src/tutil.c

@@ -351,10 +351,10 @@ int32_t titoa(uint64_t val, size_t radix, char str[]) {
 
   int32_t i = 0;
   uint64_t v = val;
-  while(v > 0) {
+  do {
     buf[i++] = s[v % radix];
     v /= radix;
-  }
+  } while (v > 0);
 
   // reverse order
   for(int32_t j = 0; j < i; ++j) {