--- a/liboctave/DASSL.cc
+++ b/liboctave/DASSL.cc
@@ -288,8 +288,13 @@
 		  // recover. A message is printed explaining the trouble
 		  // and control is returned to the calling program. For
 		  // example, this occurs when invalid input is detected.
+	  integration_error = true;
+	  break;
+
 	default:
 	  integration_error = true;
+	  (*current_liboctave_error_handler)
+	    ("unrecognized value of idid (= %d) returned from ddassl", idid);
 	  break;
 	}
     }
@@ -455,6 +460,63 @@
 
   switch (idid)
     {
+    case 1:
+      retval = "a step was successfully taken in intermediate-output mode.";
+      break;
+
+    case 2:
+      retval = "integration completed by stepping exactly to TOUT";
+      break;
+
+    case 3:
+      retval = "integration to tout completed by stepping past TOUT";
+      break;
+
+    case -1:
+      retval = "a large amount of work has been expended";
+      break;
+
+    case -2:
+      retval = "the error tolerances are too stringent";
+      break;
+
+    case -3:
+      retval = "error weight became zero during problem.\
+  (solution component i vanished, and atol or atol(i) == 0)";
+      break;
+
+    case -6:
+      retval = "repeated error test failures on the last attempted step";
+      break;
+
+    case -7:
+      retval = "the corrector could not converge";
+      break;
+
+    case -8:
+      retval = "the matrix of partial derivatives is singular";
+      break;
+
+    case -9:
+      retval = "the corrector could not converge (repeated test failures)";
+      break;
+
+    case -10:
+      retval = "corrector could not converge because IRES was -1";
+      break;
+
+    case -11:
+      retval = "return requested in user-supplied function";
+      break;
+
+    case -12:
+      retval = "failed to compute consistent initial conditions";
+      break;
+
+    case -33:
+      retval = "unrecoverable error (see printed message)";
+      break;
+
     default:
       retval = "unknown error state";
       break;