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Changeset b31f735 in mainline


Ignore:
Timestamp:
2012-03-29T21:41:07Z (8 years ago)
Author:
Jakub Jermar <jakub@…>
Branches:
master
Children:
bb1b44e
Parents:
9bdf1f2a
Message:

Add memmove() to boot.

Location:
boot/generic
Files:
2 edited

Legend:

Unmodified
Added
Removed
  • boot/generic/include/memstr.h

    r9bdf1f2a rb31f735  
    3636
    3737extern void *memcpy(void *, const void *, size_t);
     38extern void *memmove(void *, const void *, size_t);
    3839
    3940#endif
  • boot/generic/src/memstr.c

    r9bdf1f2a rb31f735  
    5151}
    5252
     53/** Move memory block with possible overlapping.
     54 *
     55 * Copy cnt bytes from src address to dst address. The source
     56 * and destination memory areas may overlap.
     57 *
     58 * @param dst Destination address to copy to.
     59 * @param src Source address to copy from.
     60 * @param cnt Number of bytes to copy.
     61 *
     62 * @return Destination address.
     63 *
     64 */
     65void *memmove(void *dst, const void *src, size_t cnt)
     66{
     67        /* Nothing to do? */
     68        if (src == dst)
     69                return dst;
     70       
     71        /* Non-overlapping? */
     72        if ((dst >= src + cnt) || (src >= dst + cnt))
     73                return memcpy(dst, src, cnt);
     74       
     75        uint8_t *dp;
     76        const uint8_t *sp;
     77       
     78        /* Which direction? */
     79        if (src > dst) {
     80                /* Forwards. */
     81                dp = dst;
     82                sp = src;
     83               
     84                while (cnt-- != 0)
     85                        *dp++ = *sp++;
     86        } else {
     87                /* Backwards. */
     88                dp = dst + (cnt - 1);
     89                sp = src + (cnt - 1);
     90               
     91                while (cnt-- != 0)
     92                        *dp-- = *sp--;
     93        }
     94       
     95        return dst;
     96}
     97
    5398/** @}
    5499 */
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