Subversion Repositories openrisc

extern void abort (void);

typedef struct foo_t

{

  unsigned int blksz;

  unsigned int bf_cnt;

} foo_t;

#define _RNDUP(x, unit)  ((((x) + (unit) - 1) / (unit)) * (unit))

#define _RNDDOWN(x, unit)  ((x) - ((x)%(unit)))

long long

foo (foo_t *const pxp,  long long offset, unsigned int extent)

{

  long long blkoffset = _RNDDOWN(offset, (long long )pxp->blksz);

  unsigned int diff = (unsigned int)(offset - blkoffset);

  unsigned int blkextent = _RNDUP(diff + extent, pxp->blksz);

  if (pxp->blksz < blkextent)

    return -1LL;

  if (pxp->bf_cnt > pxp->blksz)

    pxp->bf_cnt = pxp->blksz;

  return blkoffset;

}

int

main ()

{

  foo_t x;

  long long xx;

  x.blksz = 8192;

  x.bf_cnt = 0;

  xx = foo (&x, 0, 4096);

  if (xx != 0LL)

    abort ();

  return 0;

}