C++ (Cpp) bu_zero Examples

Example #1

File: bu_scan.c Project: Jubei-Mitsuyoshi/aaa-skalibs

int bu_scan (char const *s, unsigned int len, uint32 *x, unsigned int xn, unsigned int zeron)
{
  register unsigned int n = bitarray_div8(zeron) ;
  if (xn < n) return (errno = EOVERFLOW, 0) ;
  bu_scan_internal(s, len, x) ;
  bu_zero(x + n, xn - n) ;
  return 1 ;
}

Example #2

File: bu_divmod.c Project: fvigotti/skalibs

int bu_divmod (uint32 *q, unsigned int qn, uint32 const *y, unsigned int yn, uint32 const *x, unsigned int xn, uint32 const *m, unsigned int mn)
{
  unsigned int ylen = bu_len(y, yn) ;
  unsigned int xlen = bu_len(x, xn) ;
  unsigned int mlen = bu_len(m, mn) ;
  unsigned int n = ylen ;
  if (n < xlen) n = xlen ;
  if (n < mlen) n = mlen ;
  if (!n) return (errno = EDOM, 0) ;
  {
    uint32 yy[n] ;
    uint32 xx[n] ;
    uint32 mm[n] ;
    bu_gcd(xx, n, x, xlen, m, mlen) ;
    if ((xx[0] != 1) || (bu_len(xx, n) != 1)) return (errno = EDOM, 0) ;
    bu_copy_internal(yy, y, ylen) ; bu_zero(yy+ylen, n-ylen) ;
    bu_copy_internal(xx, x, xlen) ; bu_zero(xx+xlen, n-xlen) ;
    bu_copy_internal(mm, m, mlen) ; bu_zero(mm+mlen, n-mlen) ;
    bu_divmod_internal(yy, xx, mm, n) ;
    return bu_copy(q, qn, yy, n) ;
  }
}

Example #3

File: bu_div_internal.c Project: Jubei-Mitsuyoshi/aaa-skalibs

void bu_div_internal (uint32 *a, unsigned int an, uint32 const *b, unsigned int bn, uint32 *q, unsigned int qn)
{
  unsigned int alen = bu_len(a, an) ;
  unsigned int blen = bu_len(b, bn) ;
  bu_zero(q, qn) ;
  if (alen < blen) return ;
  {
    uint32 bb[alen + 1] ;
    unsigned int i = 1 + ((alen - blen) << 5) ;
    bu_zero(bb, alen - blen) ;
    bu_copy_internal(bb + alen - blen, b, blen) ;
    bb[alen] = 0 ;

    while (bu_cmp(a, alen, bb, alen+1) >= 0)
    {
      bu_slb(bb + alen - blen, blen + 1) ;
      i++ ;
    }
    while (i && (bu_cmp(a, alen, bb, alen+1) < 0))
    {
      bu_srb(bb, alen + 1) ;
      i-- ;
    }

    while (i--)
    {
      bu_slb(q, alen - blen + 1) ;
      if (bu_cmp(a, alen, bb, alen) >= 0)
      {
        bu_sub(a, alen, a, alen, bb, alen) ;
        q[0] |= 1 ;
      }
      bu_srb(bb, alen) ;
    }
  }
}