STRING: provide function for deleting strings

src/Makefile

@@ -37,7 +37,8 @@ endif
 LIBS += -L. -lgmp -lmpfr -lm
 
 # objects
-PQC_OBJS = poly.o mem.o encrypt.o decrypt.o keypair.o ascii_poly.o file.o
+PQC_OBJS = poly.o mem.o encrypt.o decrypt.o keypair.o ascii_poly.o file.o \
+		   ntru_string.o
 PQC_HEADERS = err.h poly.h context.h encrypt.h decrypt.h keypair.h \
 			  ascii_poly.h common.h file.h ntru_string.h
 # CUNIT_OBJS = cunit.o

src/ntru_string.c

@@ -25,3 +25,13 @@
  * like C strings and provides operations on it.
  * @brief string type and operations
  */
+
+#include "ntru_string.h"
+
+
+void
+string_delete(string *del_string)
+{
+	free(del_string->ptr);
+	free(del_string);
+}

src/ntru_string.h

@@ -51,4 +51,16 @@ struct string {
 };
 
 
+/**
+ * Delete the inner structure
+ * of the string and frees the string
+ * itself from the heap. Must not be
+ * called on stack variables.
+ *
+ * @param del_string the string to delete
+ */
+void
+string_delete(string *del_string);
+
+
 #endif /* NTRU_STRING_H */