POLY: introduce delete_polynom_multi()

Just a wrapper around delete_polynom() to handle multiple args.
Must be called with NULL as last argument!

src/poly.c

@@ -24,6 +24,7 @@
 #include "mem.h"
 #include "poly.h"
 
+#include <stdarg.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <tompoly.h>
@@ -170,6 +171,30 @@ void delete_polynom(pb_poly *poly)
 	free(poly);
 }
 
+/**
+ * This deletes the internal structure of all polynomials,
+ * and frees the pointers. Don't call this on stack variables,
+ * this is intended for use after ntru_ functions, that
+ * return a polynomial pointer.
+ * You must call this with NULL as last argument!
+ *
+ * @param poly the polynomial to delete
+ * @param ... follow up polynomials
+ */
+void delete_polynom_multi(pb_poly *poly, ...)
+{
+	pb_poly *next_poly;
+	va_list args;
+
+	next_poly = poly;
+	va_start(args, poly);
+	while (next_poly != NULL) {
+		delete_polynom(next_poly);
+		next_poly = va_arg(args, pb_poly*);
+	}
+	va_end(args);
+}
+
 /**
  * Starmultiplication, as follows:
  * c = a * b mod (x^N − 1)
@@ -353,11 +378,7 @@ OUT_OF_LOOP:
 			mp_clear(&mp_tmp);
 		}
 
-	delete_polynom(a_tmp);
+	delete_polynom_multi(a_tmp, b, c, f, g, NULL);
-	delete_polynom(b);
-	delete_polynom(c);
-	delete_polynom(f);
-	delete_polynom(g);
 
 	/* TODO: check if the f * Fq = 1 (mod p) condition holds true */
 

src/poly.h

@@ -28,6 +28,7 @@
 
 #include <tompoly.h>
 #include <tommath.h>
+#include <stdarg.h>
 #include <stdbool.h>
 
 #define MP_SET(...) mp_set(__VA_ARGS__)
@@ -164,6 +165,8 @@ void erase_polynom(pb_poly *poly, size_t len);
 
 void delete_polynom(pb_poly *new_poly);
 
+void delete_polynom_multi(pb_poly *poly, ...);
+
 void pb_starmultiply(pb_poly *a,
 		pb_poly *b,
 		pb_poly *c,