Correct spelling mistakes

src/gtextutils/natsort.h

@@ -31,7 +31,7 @@
  * and I prefer not to use it for now.
  *
  * Note 2:
- * As of FSF GNU Coreutils version 7.1, the 'sort' progarm as a similar sorting order
+ * As of FSF GNU Coreutils version 7.1, the 'sort' program as a similar sorting order
  * called 'version' (with the -V command argument).
  * Coreutils's implementation is found in <coreutils-7.1>/src/filevercmp.{ch}.
  * The results are similar to Matrin Poo's NatSort, but not identical

src/gtextutils/tuple_parser.h

@@ -14,7 +14,7 @@
 //#define TUPLE_PARSER_DEBUG
 
 /*
-   The maximun valid number for a column.
+   The maximum valid number for a column.
    The value is used in a bitset to prevent duplicated columns.
 */
 #ifndef TUPLE_PARSER_MAX_COLUMN_NUMBER
@@ -257,7 +257,7 @@ class _Tuple_Parser_impl<_Idx>
 	Users should use a Tuple_Parser<> instead of _Tuple_Parser_impl<>.
 
 
-	Usage exmaple:
+	Usage example:
 
 	  //Define a parser that extracts three fields from an input stream:
 	  //an int, a string and a double.

tests/test_tuple_parser.cpp

@@ -111,7 +111,7 @@ void test_parser_parsing_error()
 		//We should not get here
 		ASSERT ( ! "Invalid input not detected." ) ;
 	} catch ( tuple_parser_parsing_error &ex ) {
-		//exception was thrown. valid reported errornous columns
+		//exception was thrown. valid reported erroneous columns
 		ASSERT ( ex.column() == 4 ) ;
 	}
 }
@@ -139,7 +139,7 @@ void test_parser_premature_eol()
 		//We should not get here
 		ASSERT ( ! "premature-end-of-line not detected." ) ;
 	} catch ( tuple_parser_premature_end_of_line &ex ) {
-		//exception was thrown. valid reported errornous columns
+		//exception was thrown. valid reported erroneous columns
 		ASSERT ( ex.expected_columns() == 4 ) ;
 
 		ASSERT ( ex.actual_columns() == 2 ) ;