libtommath/bn_mp_fwrite.c

#include "tommath_private.h"
#ifdef BN_MP_FWRITE_C
/* LibTomMath, multiple-precision integer library -- Tom St Denis */
/* SPDX-License-Identifier: Unlicense */

#ifndef MP_NO_FILE
int mp_fwrite(const mp_int *a, int radix, FILE *stream)
{
   char *buf;
   int err, len;

   if ((err = mp_radix_size(a, radix, &len)) != MP_OKAY) {
      return err;
   }

   buf = (char *) MP_MALLOC((size_t)len);
   if (buf == NULL) {
      return MP_MEM;
   }

   if ((err = mp_toradix(a, buf, radix)) != MP_OKAY) {
      MP_FREE_BUFFER(buf, (size_t)len);
      return err;
   }

   if (fwrite(buf, (size_t)len, 1, stream) != 1) {
      MP_FREE_BUFFER(buf, (size_t)len);
      return MP_ERR;
   }

   MP_FREE_BUFFER(buf, (size_t)len);
   return MP_OKAY;
}
#endif

#endif