libdatrwxx [TASK]: uniquely specify sign of correction

src/libs/libdatrwxx/mseed/mseedread_mseedrecord_other.cc

@@ -29,11 +29,12 @@
  *
  * REVISIONS and CHANGES 
  *  - 23/06/2016   V1.0   Thomas Forbriger
+ *  - 12/07/2016   V1.1   thof: uniquely specify sign of correction
  * 
  * ============================================================================
  */
 #define DATRW_MSEEDREAD_MSEEDRECORD_OTHER_CC_VERSION \
-  "DATRW_MSEEDREAD_MSEEDRECORD_OTHER_CC   V1.0"
+  "DATRW_MSEEDREAD_MSEEDRECORD_OTHER_CC   V1.1"
 
 #include <datrwxx/mseedread.h>
 #include<aff/subarray.h>
@@ -77,27 +78,35 @@ namespace datrw {
         libtime::TRelativeTime corr(0,0,0,0,0,100);
         //long int tcorr=this->recordheader().tcorr;
         int tcorr=this->recordheader().tcorr;
-        if (tcorr > 0)
+        if (tcorr >= 0)
         {
           retval += (corr * tcorr);
         }
         else
         {
+          // result of multiplication of libtime::TAbsoluteTime with
+          // any value (also negative) provides a positive result;
+          // swap sign just to make things clear
+          tcorr *= -1;
           retval -= (corr * tcorr);
         }
       }
       if (this->hasblockette1001())
       {
-        const int& tcorr=this->blockette1001().iusec();
+        int tcorr=this->blockette1001().iusec();
         if (tcorr != 0)
         {
           libtime::TRelativeTime corr(0,0,0,0,0,1);
-          if (tcorr > 0)
+          if (tcorr >= 0)
           {
             retval += (corr * tcorr);
           }
           else
           {
+            // result of multiplication of libtime::TAbsoluteTime with
+            // any value (also negative) provides a positive result;
+            // swap sign just to make things clear
+            tcorr *= -1;
             retval -= (corr * tcorr);
           }
         }