bn_mp_fput.c

#include <tommath.h>
#ifdef BN_MP_FPUT_C


int mp_fput(mp_int *a, int base, FILE *stream)
{
   char *str, *s0;
   size_t size, n;
   int err;

   size = mp_digits(a, base) + 10;
   str = malloc(size * sizeof(char));
   if (NULL == str) {
#ifdef DEBUG
      fprintf(stderr, "malloc failed to allocate %d bytes\n",
              size * sizeof(char));
#endif
      return MP_MEM;
   }
   s0 = str;
   n = size;
   while (--n) {
      *s0++ = '\0';
   }
   if ((err = mp_toradix(a, str, base)) != MP_OKAY) {
      return err;
   }
   fputs(str,stream);
   // This library might get used for cryptographic purposes, so
   // overwrite the memory, at least.
   n = size;
   s0 = str;
   while (--n) {
      *s0++ = '\0';
   }
   free(str);
   return MP_OKAY;
}

#endif