Added substring capability to ZString.

ZString.h

@@ -42,7 +42,7 @@ namespace coreutils {
       ZString();
 
       ///
-      ///
+      /// Constructor wrapping a null terminated buffer to a ZString.
       ///
 
       ZString(const char *data);
@@ -53,6 +53,10 @@ namespace coreutils {
 
       ZString(char *data, size_t length);
 
+      ///
+      ///
+      ///
+      
       ZString(const char *data, size_t length);
 
       ///
@@ -74,8 +78,8 @@ namespace coreutils {
       ~ZString();
 
       ///
-      /// A friend method used to write the value of the ZString from the cursor
-      /// point to an ostream using the << syntax.
+      /// A friend method used to write the value of the ZString 
+      /// to an ostream using the << syntax.
       ///
 
       friend std::ostream& operator<<(std::ostream& os, const ZString& zstring);
@@ -83,9 +87,19 @@ namespace coreutils {
       friend std::ostream& operator+(std::ostream& os, const ZString& zstring);
       friend std::ostream& operator+(std::ostream& os, const char *value);
 
+      ///
+      ///
+      ///
+      
       bool operator<(const ZString &valuex) const;
+
+      ///
+      ///
+      ///
+      
       bool operator>(const ZString &valuex) const;
       bool operator==(const ZString &valuex) const;
+      bool operator==(const char *valuex) const;
       bool operator!=(const ZString &valuex) const;
       bool operator!=(const char *valuex) const;
 
@@ -146,6 +160,18 @@ namespace coreutils {
       ///
       ///
 
+      ZString substring(int start);
+
+      ///
+      ///
+      ///
+      
+      ZString substring(int start, int len);
+      
+      ///
+      ///
+      ///
+
       std::vector<ZString> &split(ZString &delimiter, size_t maxSize = 0);
 
       ///
@@ -168,6 +194,10 @@ namespace coreutils {
 
       ZString getTokenExclude(const char *exclude);
 
+      ///
+      ///
+      ///
+      
       ZString getTokenExclude(std::string exclude);
 
       ///
@@ -219,8 +249,16 @@ namespace coreutils {
 
       bool ifNext(const char *value);
 
+      ///
+      ///
+      ///
+      
       bool ifNext(ZString &value);
 
+      ///
+      ///
+      ///
+      
       int ifEqualsCount(ZString &comparator);
 
       ///
@@ -255,6 +293,10 @@ namespace coreutils {
 
       char* getCursor();
 
+      ///
+      ///
+      ///
+      
       void setCursor(char *cursor);
 
       ///