--- loncom/homework/caparesponse/caparesponse.c	2003/05/27 15:29:02	1.8
+++ loncom/homework/caparesponse/caparesponse.c	2004/03/12 21:06:19	1.12
@@ -1,6 +1,6 @@
 /* The LearningOnline Network with CAPA 
  * CAPA wrapper code
- * $Id: caparesponse.c,v 1.8 2003/05/27 15:29:02 bowersj2 Exp $
+ * $Id: caparesponse.c,v 1.12 2004/03/12 21:06:19 albertel Exp $
  *
  * Copyright Michigan State University Board of Trustees
  *
@@ -68,7 +68,7 @@ int caparesponse_capa_check_answer(char
 				   int sig_lbound,int sig_ubound, 
 				   char *ans_fmt, char *unit_str,
 				   int calc, char *id_list, char *pts_list, 
-				   char *rndseed)
+				   char *rndseed, char** reterror)
 				   
 {
   long result,seed1,seed2;
@@ -76,7 +76,7 @@ int caparesponse_capa_check_answer(char
   char *error=NULL,filename[FILE_NAME_LENGTH];
   FILE *fp;
 
-  /* eed to initialize unit parser*/
+  /* need to initialize unit parser*/
   sprintf(filename,"/home/httpd/html/res/adm/includes/capa.units");
   if ((fp=fopen(filename,"r"))==NULL) {
     /* printf("Error: can't open %s\n",filename);*/
@@ -112,12 +112,14 @@ int caparesponse_capa_check_answer(char
     p.ans_unit   = u_parse_unit(unit_str);
   } else {
     p.unit_str[0]='\0';
+    p.ans_unit=NULL;
   }
   p.calc       = calc;
 
   result=capa_check_answer(&p,response,&error);
-
-  if (error!=NULL) {free(error);}
+  *reterror=error;
+  // Caller is expected to free reterror
+  //  if (error!=NULL) {free(error);}
 
   return result;
 }