1 files changed, 48 insertions, 0 deletions
diff --git a/src/reducer/validation_XX_SQUARE.c b/src/reducer/validation_XX_SQUARE.c
new file mode 100644
index 0000000..fa3ebfb
--- /dev/null
+++ b/src/reducer/validation_XX_SQUARE.c
@@ -0,0 +1,48 @@
+/*
+  This file is part of Anastasis
+  Copyright (C) 2020, 2021 Taler Systems SA
+
+  Anastasis is free software; you can redistribute it and/or modify it under the
+  terms of the GNU Lesser General Public License as published by the Free Software
+  Foundation; either version 3, or (at your option) any later version.
+
+  Anastasis is distributed in the hope that it will be useful, but WITHOUT ANY
+  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+  A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with
+  Anastasis; see the file COPYING.GPL.  If not, see <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file redux/validation_XX_PRIME.c
+ * @brief anastasis reducer api
+ * @author Christian Grothoff
+ * @author Dominik Meister
+ * @author Dennis Neufeld
+ */
+#include <string.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <math.h>
+
+/**
+ * Function to validate a square number.
+ *
+ * @param sq_number square number to validate (input)
+ * @return true if sq_number is a square, else false
+ */
+bool
+XX_SQUARE_check (const char *sq_number)
+{
+  unsigned long long n;
+  unsigned long long r;
+  char dummy;
+
+  if (1 != sscanf (sq_number,
+                   "%llu%c",
+                   &n,
+                   &dummy))
+    return false;
+  r = sqrt (n);
+  return (n == r * r);
+}