Import code from previous AssetBuilder version

thirdparty/libtommath/bn_mp_fwrite.c

@@ -0,0 +1,51 @@
+#include "tommath_private.h"
+#ifdef BN_MP_FWRITE_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
+ */
+
+#ifndef LTM_NO_FILE
+int mp_fwrite(const mp_int *a, int radix, FILE *stream)
+{
+   char *buf;
+   int err, len, x;
+
+   if ((err = mp_radix_size(a, radix, &len)) != MP_OKAY) {
+      return err;
+   }
+
+   buf = OPT_CAST(char) XMALLOC((size_t)len);
+   if (buf == NULL) {
+      return MP_MEM;
+   }
+
+   if ((err = mp_toradix(a, buf, radix)) != MP_OKAY) {
+      XFREE(buf);
+      return err;
+   }
+
+   for (x = 0; x < len; x++) {
+      if (fputc((int)buf[x], stream) == EOF) {
+         XFREE(buf);
+         return MP_VAL;
+      }
+   }
+
+   XFREE(buf);
+   return MP_OKAY;
+}
+#endif
+
+#endif
+
+/* ref:         HEAD -> master, tag: v1.1.0 */
+/* git commit:  08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
+/* commit time: 2019-01-28 20:32:32 +0100 */