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  1. /* Public domain.  */
  2. #include <stddef.h>
  3.  
  4. void *
  5. memmove (void *dest, const void *src, size_t len)
  6. {
  7.   char *d = dest;
  8.   const char *s = src;
  9.   if (d < s)
  10.     while (len--)
  11.       *d++ = *s++;
  12.   else
  13.     {
  14.       char *lasts = s + (len-1);
  15.       char *lastd = d + (len-1);
  16.       while (len--)
  17.         *lastd-- = *lasts--;
  18.     }
  19.   return dest;
  20. }
  21.