campo-sirio/gfm/dmbyp10t.c

/* int _DivUnsArrByPwrOf10(a,n,p)
 *
 * ARGUMENT
 *      unsigned        a[];
 *      int             p;            power of 10 to divide by
 *      int             n;            number of digits
 *
 * DESCRIPTION
 *      Divides a number of n words (a) by a power of 10, c= a/10^p,
 *  a>=0, p>0, truncating the result, c is correct only if a/10^p<2^79.
 *
 * SIDE EFFECTS
 *      The value of a is destroyed.
 *
 * RETURNS
 *      None. (always succeeds)
 *
 * AUTHOR
 *      Brugnoli Giugno 1992
 *
 * MODIFICATIONS
 *
 */

#include <stdio.h>
#include <math.h>
#include "gm.h"
#include "gmsystem.h"

void    _DivUnsArrByPwrOf10Trunc(a,n,p)
unsigned  SHORT       a[];
int             n,p;
{
  while (p>4)
  {
    _DivUnsArrByUns(a,10000,n);
    p-=4;
  }

  switch (p)
  {
		case 0: _DivUnsArrByUns(a,1,n); break;
		case 1: _DivUnsArrByUns(a,10,n); break;
		case 2: _DivUnsArrByUns(a,100,n); break;
		case 3: _DivUnsArrByUns(a,1000,n); break;
		case 4: _DivUnsArrByUns(a,10000,n); break;
		default: break;
  }
}