1  /* bcopy -- copy memory regions of arbitary length
       2  
       3  @deftypefn Supplemental void bcopy (char *@var{in}, char *@var{out}, int @var{length})
       4  
       5  Copies @var{length} bytes from memory region @var{in} to region
       6  @var{out}.  The use of @code{bcopy} is deprecated in new programs.
       7  
       8  @end deftypefn
       9  
      10  */
      11  
      12  #include <stddef.h>
      13  
      14  void
      15  bcopy (const void *src, void *dest, size_t len)
      16  {
      17    if (dest < src)
      18      {
      19        const char *firsts = (const char *) src;
      20        char *firstd = (char *) dest;
      21        while (len--)
      22  	*firstd++ = *firsts++;
      23      }
      24    else
      25      {
      26        const char *lasts = (const char *)src + (len-1);
      27        char *lastd = (char *)dest + (len-1);
      28        while (len--)
      29          *lastd-- = *lasts--;
      30      }
      31  }