kc3-lang/libtommath/mp_lcm.c

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• Hash : 7a68f128
  Author :
  Date : 2019-10-19T16:24:39
  

  Execute move.sh - Rename files from bn_* to match the function names. * git blame <renamed-file> is not affected * git log --follow <renamed-file> can be used to show log across renames

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• mp_lcm.c

• #include "tommath_private.h"
  #ifdef MP_LCM_C
  /* LibTomMath, multiple-precision integer library -- Tom St Denis */
  /* SPDX-License-Identifier: Unlicense */
  
  /* computes least common multiple as |a*b|/(a, b) */
  mp_err mp_lcm(const mp_int *a, const mp_int *b, mp_int *c)
  {
     mp_err  err;
     mp_int  t1, t2;
  
  
     if ((err = mp_init_multi(&t1, &t2, NULL)) != MP_OKAY) {
        return err;
     }
  
     /* t1 = get the GCD of the two inputs */
     if ((err = mp_gcd(a, b, &t1)) != MP_OKAY) {
        goto LBL_T;
     }
  
     /* divide the smallest by the GCD */
     if (mp_cmp_mag(a, b) == MP_LT) {
        /* store quotient in t2 such that t2 * b is the LCM */
        if ((err = mp_div(a, &t1, &t2, NULL)) != MP_OKAY) {
           goto LBL_T;
        }
        err = mp_mul(b, &t2, c);
     } else {
        /* store quotient in t2 such that t2 * a is the LCM */
        if ((err = mp_div(b, &t1, &t2, NULL)) != MP_OKAY) {
           goto LBL_T;
        }
        err = mp_mul(a, &t2, c);
     }
  
     /* fix the sign to positive */
     c->sign = MP_ZPOS;
  
  LBL_T:
     mp_clear_multi(&t1, &t2, NULL);
     return err;
  }
  #endif
  

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