Import code from previous AssetBuilder version

thirdparty/libtommath/bn_mp_init_copy.c

@@ -0,0 +1,34 @@
+#include "tommath_private.h"
+#ifdef BN_MP_INIT_COPY_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
+/* creates "a" then copies b into it */
+int mp_init_copy(mp_int *a, const mp_int *b)
+{
+   int     res;
+
+   if ((res = mp_init_size(a, b->used)) != MP_OKAY) {
+      return res;
+   }
+
+   if ((res = mp_copy(b, a)) != MP_OKAY) {
+      mp_clear(a);
+   }
+
+   return res;
+}
+#endif
+
+/* ref:         HEAD -> master, tag: v1.1.0 */
+/* git commit:  08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
+/* commit time: 2019-01-28 20:32:32 +0100 */