cleanup for valgrind.

File.h

@@ -17,7 +17,7 @@ namespace coreutils {
 
     public:
       File(ZString fileName, int mode = O_RDONLY, int authority = 0664);
-      ~File();
+      virtual ~File();
       void setBufferSize(size_t size);
       int read();
       int readLine();

ZString.cpp

@@ -66,10 +66,8 @@ namespace coreutils {
    }
 
    ZString::~ZString() {
-      if(cdata != NULL) {
-	 std::cout << "********" << cdata << "********" << strlen(cdata) << std::endl;	   
-	 free(cdata);
-      }      
+      if(cdata != NULL) 
+	free(cdata);      
    }
 
    bool ZString::operator<(const ZString &valuex) const {
@@ -234,7 +232,10 @@ namespace coreutils {
    }
 
    char* ZString::c_str() {
-      cdata = (char *)malloc(length + 1);
+      if(cdata == NULL)
+	cdata = (char *)malloc(length + 1);
+      else
+	cdata = (char *)realloc(cdata, length + 1);
       strncpy(cdata, data, length);
       cdata[length] = '\0';
       return cdata;