release/src-rt-6.x.4708/linux/linux-2.6.36/arch/m68knommu/lib/memcpy.c

   1
   2 #include <linux/types.h>
   3
   4 void * memcpy(void * to, const void * from, size_t n)
   5 {
   6 #ifdef CONFIG_COLDFIRE
   7   void *xto = to;
   8   size_t temp;
   9
  10   if (!n)
  11     return xto;
  12   if ((long) to & 1)
  13     {
  14       char *cto = to;
  15       const char *cfrom = from;
  16       *cto++ = *cfrom++;
  17       to = cto;
  18       from = cfrom;
  19       n--;
  20     }
  21   if (n > 2 && (long) to & 2)
  22     {
  23       short *sto = to;
  24       const short *sfrom = from;
  25       *sto++ = *sfrom++;
  26       to = sto;
  27       from = sfrom;
  28       n -= 2;
  29     }
  30   temp = n >> 2;
  31   if (temp)
  32     {
  33       long *lto = to;
  34       const long *lfrom = from;
  35       for (; temp; temp--)
  36         *lto++ = *lfrom++;
  37       to = lto;
  38       from = lfrom;
  39     }
  40   if (n & 2)
  41     {
  42       short *sto = to;
  43       const short *sfrom = from;
  44       *sto++ = *sfrom++;
  45       to = sto;
  46       from = sfrom;
  47     }
  48   if (n & 1)
  49     {
  50       char *cto = to;
  51       const char *cfrom = from;
  52       *cto = *cfrom;
  53     }
  54   return xto;
  55 #else
  56   const char *c_from = from;
  57   char *c_to = to;
  58   while (n-- > 0)
  59     *c_to++ = *c_from++;
  60   return((void *) to);
  61 #endif
  62 }