mpf_div.c

   1 /* LibTomFloat, multiple-precision floating-point library
   2  *
   3  * LibTomFloat is a library that provides multiple-precision
   4  * floating-point artihmetic as well as trigonometric functionality.
   5  *
   6  * This library requires the public domain LibTomMath to be installed.
   7  *
   8  * This library is free for all purposes without any express
   9  * gurantee it works
  10  *
  11  * Tom St Denis, tomstdenis@iahu.ca, http://float.libtomcrypt.org
  12  */
  13 #include <tomfloat.h>
  14
  15 int  mpf_div(mp_float *a, mp_float *b, mp_float *c)
  16 {
  17    mp_float tmp;
  18    int err;
  19
  20    /* ensure b is not zero */
  21    if (mp_iszero(&(b->mantissa)) == MP_YES) {
  22       return MP_VAL;
  23    }
  24
  25    /* find 1/b */
  26    if ((err = mpf_init(&tmp, c->radix)) != MP_OKAY) {
  27       return err;
  28    }
  29    if ((err = mpf_inv(b, &tmp)) != MP_OKAY)                           { goto __ERR; }
  30
  31    /* now multiply */
  32    err = mpf_mul(&tmp, a, c);
  33
  34 __ERR: mpf_clear(&tmp);
  35    return err;
  36 }
  37