--- ./sci_gateway/c/swt_common.h.orig
+++ ./sci_gateway/c/swt_common.h
@@ -323,10 +323,10 @@
 //extern int is_scalar (int row, int col);
 //extern int is_vector (int row, int col);
 //extern int is_matrix (int row, int col);
-extern void void_check (int number, int *type);
-extern void scalar_check (int number, int *type);
-extern void vector_check (int number, int *type);
-extern void matrix_check (int number, int *type);
+extern int void_check (int number, int *type);
+extern int scalar_check (int number, int *type);
+extern int vector_check (int number, int *type);
+extern int matrix_check (int number, int *type);
 extern void real_or_complex (int number, int *type);
 extern int sci_matrix_vector_real (int number);
 extern int sci_matrix_vector_complex (int number);
@@ -341,8 +341,8 @@
 extern int scalar_string_check(char *l, char c);
 extern int length_check(int number, int leng);
 extern int vector_length_check(int number1, int number2);
-extern void vector_length_compare(int number, int leng, int *res);
-extern void matrix_length_compare(int number, int rowLeng, 
+extern int vector_length_compare(int number, int leng, int *res);
+extern int matrix_length_compare(int number, int rowLeng, 
 				  int colLeng, int *resRow, 
 				  int *resCol);
 extern int matrix_length_check (int number1, int number2);
--- ./sci_gateway/c/validate.c.orig
+++ ./sci_gateway/c/validate.c
@@ -42,7 +42,7 @@
 /*-------------------------------------------
  * Dimension Checking
  *-----------------------------------------*/
-void void_check (int number, int *type)
+int void_check (int number, int *type)
 {
   int row, col;
   GetMatrixdims(number,&row,&col);
@@ -50,10 +50,10 @@
     *type = 1;
   else
     *type = 0;
-  //return;
+  return 1;
 }
 
-void scalar_check (int number, int *type)
+int scalar_check (int number, int *type)
 {
   int row, col;
   GetMatrixdims(number,&row,&col);
@@ -61,10 +61,10 @@
     *type = 1;
   else
     *type = 0;
-  //return;
+  return 1;
 }
 
-void vector_check (int number, int *type)
+int vector_check (int number, int *type)
 {
   int row, col;
   GetMatrixdims(number,&row,&col);
@@ -74,10 +74,10 @@
     *type = 1;
   else
     *type = 0;
-  //return;
+  return 1;
 }
 
-void matrix_check (int number, int *type)
+int matrix_check (int number, int *type)
 {
   int row, col;
   GetMatrixdims(number,&row,&col);
@@ -85,7 +85,7 @@
     *type = 1;
   else
     *type = 0;
-  //return;
+  return 1;
 }
 
 void real_or_complex (int number, int *type)
@@ -234,7 +234,7 @@
     return 0;
 }
 
-void vector_length_compare(int number, int leng, int *res)
+int vector_length_compare(int number, int leng, int *res)
 {
   int row, col;
   GetMatrixdims(number,&row,&col);
@@ -244,10 +244,10 @@
     *res = 1;
   else
     *res = -1;
-  return;
+  return 1;
 }
 
-void matrix_length_compare(int number, int rowLeng, int colLeng, 
+int matrix_length_compare(int number, int rowLeng, int colLeng, 
 			   int *resRow, int *resCol)
 {
   int row, col;
@@ -264,7 +264,7 @@
     *resCol = 1;
   else
     *resCol = -1;
-  return;
+  return 1;
 }
 
 int