mpf_sub_d.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_sub_d(mp_float *a, long b, mp_float *c)
  16 {
  17    int      err;
  18    mp_float tmp;
  19
  20    if ((err = mpf_init(&tmp, c->radix)) != MP_OKAY) {
  21       return err;
  22    }
  23
  24    if ((err = mpf_const_d(&tmp, b)) != MP_OKAY)              { goto __ERR; }
  25    err = mpf_sub(a, &tmp, c);
  26
  27 __ERR:
  28    mpf_clear(&tmp);
  29    return err;
  30 }
  31