Added ZString.c_str() function; Added MStrin operator=.

ZString.cpp

@@ -46,6 +46,11 @@ namespace coreutils {
       cursor = (char *)data.c_str();
    }
 
+   ZString::~ZString() {
+      if(cdata)
+	free(cdata);
+   }   
+   
    bool ZString::operator<(const ZString &valuex) const {
       return (strncmp(cursor, valuex.cursor, (valuex.length <= length ? valuex.length : length)) < 0);
    }
@@ -101,24 +106,30 @@ namespace coreutils {
       return std::string(data, len);
    }
 
+   char* ZString::c_str() {
+      cdata = (char *)malloc(length + 1);
+      strncpy(cdata, data, length);
+      cdata[length] = '\0';
+      return cdata;
+   }   
+   
    std::vector<ZString> &ZString::split(std::string delimiter, size_t maxSize)
    {
       coreutils::ZString zDelimiter((char *)delimiter.c_str(), delimiter.size());
       return split(zDelimiter, maxSize);
    }
 
-   std::vector<ZString> &ZString::split(ZString &delimiter, size_t maxSize)
-   {
+   std::vector<ZString> &ZString::split(ZString &delimiter, size_t maxSize) {	   
       list.clear();
       if (length == 0) {
          list.push_back(ZString(""));
          return list;
       }
-
+      maxSize = maxSize == 0 ? 255: maxSize;
       char *end = data + length;
       char *pos = cursor;
       while ((pos + delimiter.getLength()) <= end) {
-         if ((strncmp(pos, delimiter.getData(), delimiter.getLength()) == 0) && (maxSize > 0))
+         if ((strncmp(pos, delimiter.getData(), delimiter.getLength()) == 0) && (maxSize != 0))
          {
             list.push_back(ZString(cursor, pos - cursor));
             cursor = pos + delimiter.getLength();