/* int _SubUnsArrFromUnsArr(src1,src2,dst,n)
 *
 * ARGUMENT
 *      unsigned        *src1, *src2, *dst;
 *      unsigned        n;
 *
 * DESCRIPTION
 *      Subtracts src2 from src2 giving dst. src1 and src2 are unchanged.
 *  src1, src2 and dst point to unsigned arrays.
 *
 * SIDE EFFECTS
 *
 *
 * RETURNS
 *      GM_SUCCESS if no overflow, otherwise GM_FAILURE.
 *
 * AUTHOR
 *      Brugnoli Giugno 1992
 *
 * MODIFICATIONS
 *
 */

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

int _SubUnsArrFromUnsArr(src1, src2, dst, n)
unsigned SHORT        src1[], src2[], dst[];
int             n;
{
  int i;
  unsigned long psrc;
  unsigned SHORT carry = 0;

  if (n>0)
  {
    for (i=0;i<n;i++)
    {
      psrc= (long)src1[i] - (long)carry;
      carry = src2[i] > src1[i] ? 1 : 0;
      
			if (carry)
        psrc += MAXUNSINT+0x1L;
      dst[i]=(unsigned SHORT)(psrc-(unsigned long)src2[i]);
    }
    if (carry)
      return(GM_FAILURE);
  }
  return(GM_SUCCESS);
}